Physics exam 2
You are in a car, going over a high hill at a high speed. What makes you feel like you are getting thrown from your seat? 1) You no longer feel as strong of a normal force from the seat because your inertia keeps you moving up as the car drops beneath you. 2) There is a force throwing you up from your seat.
1 only
Why are cars bumpers designed to collapse? 1) The bumpers collapse so energy is lost to thermal processes, so the cars will not bounce off each other with high speeds (especially with reversals of momentum). 2) The bumpers collapse to extend the time of the collision; as a result, the forces between the cars involved in the collision will be decreased. 3) The bumpers collapse so damage will be more likely restricted to the replaceable bumper, rather than a more vital area of the car such as the vehicle frame.
1, 2 and 3
You drop a ball vertically. The ball would experience an ideally elastic bounce if: 1) no energy was dispersed into other forms in the bounce. 2) the coefficient of restitution was equal to 1. 3) the ball bounced back to its original height.
1,2 and 3
Which of the following contribute to whether or not the bug in the above problem will be able to sit on a fixed position on a spinning record? 1) The radius where the bug sits. 2) The coefficient of static friction between the bugs feet and the record's surface. 3) The speed at which the record is played.
1,2, and 3
you are standing in a elevator on a spring scale. When does the scale report an accurate reading of your weight? 1) When the elevator is moving up at constant speed. 2) When the elevator is moving down at constant speed. 3) When the elevator is stationary.
1,2, and 3
You are an interplanetary entrepreneur. The citizens of Planet Y have a heavy demand for chocolate-coated fireflies. Your boxes are sometimes labelled by volume, sometimes by weight, and sometimes by mass. The gravitational acceleration constant on Planet Y is slightly less than that on Earth. When you ship a box of chocolate-coated fireflies, a shipment is stopped in customs on Planet Y for labeling violations. What happened? 1) The boxes that list the volume of the contents are mislabeled. 2) The boxes that list the weight of the contents are mislabeled. 3) The boxes that list the mass of the contents are mislabeled .
2 only
A sample of helium, and a sample of nomal air (a mix of mostly nitrogen but also oxygen, carbon dioxide, water vapor and many other gaseous components) have the same temperature and pressure. What is different about them? A) The molecules in the helium sample have smaller mass. B) The helium sample has a smaller particle density. C) The molecules in the helium sample have a smaller average KE.
A only
You and your friend are on a trip to the local museum and you notice that in the aquarium there are four fish: Fish 1 is floating, Fish 2 is stationary 2m below the water's surface, Fish 3 is stationary 4 m below the water's surface and Fish 5 is on the sand at bottom of the tank. (Note: things don't look good for Fish 1 and Fish 4 but that's beside the point here.) Your friend says that she'll buy you lunch if you rank the densities of the fish in order of increasing density, including the density of water in your ranking. Please select your ranking below. A- 1<(2=3=water)<4 B- 4<3<2<water<1 C- 4<(3=2=water)<1 D- 1<water<2<3<4
A- 1<(2=3=water)<4
You are the passenger in a car that is making a sharp left turn. You see a book on the dashboard begin sliding to the right because: A- Inertia makes the book continue straight ahead as the car moves left B-a centrifugal force pushed the book toward the right C-a sliding friction force pushes the book toward the right D-a static friction force pushes the book toward the right
A- Inertia makes the book continue straight ahead as the car moves left
You are dropping several objects (described below) on a tile floor. Which ball do you expect to have the lowest coefficient of restitution? A- a clay ball B- a solid rubber ball C- a brand new tennis ball D- a golf ball
A- a clay ball
A bug is sitting on a spinning record. What provides the centripetal acceleration force that keeps the bug on the record? A- a static friction force B- a tension force C- a sliding friction force D- an electrostatic force
A- a static friction force
You are bouncing a small rubber ball in the music room of your younger brother's high school. You decide it will be fun to try to use the ball to play a song on the xylophone. You notice that the ball doesn't bounce well on the xylophone when you drop it in the middle of the bar (where you would normally hit the bar with a mallet). Instead, you notice it bounces well where the bar is attached to the instrument (and where it won't make a sound). This place where it bounces well (and where the bar doesn't vibrate) is known as A- a vibrational node B- a vibrational antinode C- the center of mass D- the center of percussion
A- a vibrational node
Perfectly elastic collisions are: A- common only in atomic-scale collisions (particles in the air) B- common only in large-scale collisions (ex. cars with high-quality bumpers). C- Common both at the large-scale and the small-scale collisions. D- never observed in nature
A- common only in atomic- scale collisions
The absolute zero SI temperature scale is the A- kelvin scale B- rankine scale C- celcius scale D- Fahrenheit scale
A- kelvin scale
As you cool off a sample of gas in a container, its molecules will: A- lose KE, and slow down and eventually clump together as a liquid on the walls or at the bottom of the container.. B-gain KE and rise to the top of the container. C- react and form special ice cream that the physics germlins will gobble up. D- continue to move about the container with their original KE.
A- lose KE, and slow down and eventually clump together as a liquid on the walls or at the bottom of the container..
When a force is distributed over a surface, the average force per unit area is known as: A- pressure B-density C- temperature D- buoyancy
A- pressure
A coefficient of restitution equal to zero would mean that: A- the object does not bounce back at all after impact B- the object is probably undistorted after impact C- no kinetic energy is lost in the impact D- the bounce is completely elastic
A- the object does not bounce back at all after impact
You are swinging a bat at a ball and hit a home run. In order to determine the quality of the bounce with the fewest measurements, you need to measure: A- the speeds of the ball and the bat, both before and after the hit (4 measurements) B- the speed of the ball before and after you hit the ball. (2 measurements) C- B. The speed of the ball after you made the hit. (1 measurement) D- C. The speed of the ball and bat, but only after you hit the ball. (2 measurements)
A- the speeds of the ball and the bat, both before and after the hit. (4 measurements)
You place a watermelon in the basket of a grocery-store spring scale. The spring scale works because: A- the stretch of the spring has been calibrated to standardized weights B- the elastic potential energy of the spring equals the weight of the watermelon C- the equilibrium length of the spring equals the weight of your watermelon D- the watermelon's weight stretches the spring to its elastic limit
A- the stretch of the spring has been calibrated to standardized weights
Napoleon Dynamite is playing tetherball. In the game, a child hits a ball, which is attached to a string that is tied to the top of a post. The ball circles the past. Which the ball is in motion, what force provides the radically-inward force that keeps the ball circling the post? A-the tension force from the string B-the force from the child's hit C- the gravitational force between the earth and the child D- the sliding friction force from the air
A- the tension force from the string
A commercially-available blow-dryer diffuser is shown in the image to the right. The funnel shape of the diffuser reduces the risk of heat damage, but there is another hazard associated with these attachments. What is the physics of this hazard? A-The air flow is faster inside the funnel, so your hair could be "sucked in" by the low pressure inside. B-The air flow is faster inside the funnel, so your hair could be "sucked in" by high pressure inside. C-The air flow is slower inside the funnel; your hair could be "sucked in" by the low pressure inside. D-The air flow is slower inside the funnel; your hair could be "sucked in" by the high pressure inside.
A-The air flow is faster inside the funnel, so your hair could be "sucked in" by the low pressure inside.
Why are composite baseball bats better than solid wood bats? A-The surfaces of composite bats work like small trampolines, temporarily distorting to store the kinetic energy as elastic energy, eventually releasing it back into to the ball as kinetic energy towards the end of the impact. B- The surfaces of composite bats do not distort at all, so energy is not lost to thermal heating during the impact. C-The-composite bats do not have any nodes or anti nodes of vibration so energy is not lost to vibration during the impact, and you don't have to worry about where you hit the ball along the bat's surface. D-The composite bats are cheaper to manufacture, so you get "more bang for your buck."
A-The surfaces of composite bats work like small trampolines, temporarily distorting to store the kinetic energy as elastic energy, eventually releasing it back into to the ball as kinetic energy towards the end of the impact.
You are flying from Miami to the Bahamas (both at sea level). If you pack a half-full bottle of shampoo in your suitcase before traveling but you don't have a plastic bag, what would be the best way to pack it and why? A-You should squeeze some of the air out of the bottle, because as the plane ascends to flying altitude, the outside pressure in the cargo bay of the plane is smaller than the original pressure, and the bottle may expand and explode. B-You should squeeze some of the air out of the bottle, because as the plane ascends, the outside pressure in the cargo bay of the plane is larger than the original pressure, and the bottle may compress and implode (explode inwards). C-You should blow more air into the bottle, because as the plane descends, the outside pressure in the cargo bay of the plane is smaller than the original pressure, and the bottle may expand and explode. D-You should blow more air into the bottle, because as the plane descends, the outside pressure in the cargo bay is larger than the original pressure, and the bottle may compress and implode.
A-You should squeeze some of the air out of the bottle, because as the plane ascends to flying altitude, the outside pressure in the cargo bay of the plane is smaller than the original pressure, and the bottle may expand and explode.
Which of the following will INCREASE the flow rate of fluid through a pipe? A-increasing the pressure difference between one end of the pipe and another. B-Increasing the viscosity of the fluid. C-increasing the length of the the pipe. Note -- the original version of this solution had "decreasing" so if you chose it you should be awarded credit. D-decreasing the diameter of the pipe.
A-increasing the pressure difference between one end of the pipe and another.
You are riding in a car. It is turning left. The direction of the force on the car AND everything in it is: A- left (into the turn) B- backwards (tangent to the turn) C- right (out of the turn) D- forwards (tangent to the turn)
A-left (into the turn)
You stop for a cappuccino at a coffee shop and notice that the tiny white bubbles of steamed milk remain on the surface of the coffee. These air filled bubbles stay where they are instead of descending into the coffee or rising into the air because they are: A- less dense than the coffee but more dense than the air above the coffee B-thicker than the coffee but less thick than the air above the coffee. C- made by your coffee barrista, who is a physics gremlin in disguise. D- more dense than the coffee but less dense than the air above the coffee.
A-less dense than the coffee but more dense than the air above the coffee
One reason many propeller planes have two propellers is: A-spin the propellers in opposite directions so that torque on the plane (making it flip) is not of a threat. B- to prevent the airflow from having vortices, which both reduce efficiency and are hazardous to other aircraft. C-because physics gremlins manufacture propellors and have distributed the appropriate propaganda to increase their sales. D-to provide extra thrust and allow the plane to exceed the speed of sound.
A-spin the propellers in opposite directions so that torque on the plane (making it flip) is not of a threat.
You have two identical hollow plastic balls. You break one open, fill it halfway with plastic beads, then seal it. When you drop it on the floor, you notice that it does not bounce back as well as the unfilled ball. Why? A- the beads can shift in the balls, so no kinetic energy is lost to heating by internal friction B- the ball weighs more, therefore it will bounce back less C- The beads are made of plastic, not rubber, therefore they will not help it bounce like rubber beads would. D- Well inflated balls bounce well; since some of the air is removed because the space is occupied by beads, the ball no longer bounces as well.
A-the beads can shift in the balls, so no kinetic energy is lost to heating by internal friction
a hot air balloon works because: A-the density of air in the balloon is less than that of the surrounding air outside, so there is a large buoyant force. B-the kinetic energy from the hot air particles inside the balloon transfer kinetic energy into the balloon C-the momentum of the hot air molecules leaving from the vents at the top of the balloon must be balanced by increased momentum given to the balloon itself D-hot air molecules enter the balloon, hot air has upward velocity and this the buoyant force is greater
A-the density of air in the balloon is less than that of the surrounding air outside, so there is a large buoyant force.
Why is a golf ball dimpled? A-the dimples trigger the boundary layers of the air on the ball to become turbulent, and the size of the turbulent wake decreases as a result B-the dimples keep the flow of the boundary layers laminar, and the size of the turbulent wake is smaller as a result C-The dimples trigger the boundary layers of the air on the ball to become turbulent, and the size of the turbulent wake increases as a result. D-The dimples keep the flow of the boundary layers laminar, and the size of the turbulent wake is larger as a result.
A-the dimples trigger the boundary layers of the air on the ball to become turbulent, and the size of the turbulent wake decreases as a result
if there is no air resistance, the ratio of rebound energy to collision energy is the same as the ratio of: A-the maximum height of the bounce to the the height from which an object is initially dropped B-the speed of an object when it hits the ground to the speed at which it bounces back C-the amount a ball is compressed to its uncompressed diameter D-the momentum of an object when it hits the ground to the momentum it had when it bounces back
A-the maximum height of the bounce to the height from which an object initially dropped
A small rolled-up ball of aluminum will float... but a larger bar of aluminum will not. What statement explains this? A- Water cannot get into the air pockets of the ball to equalize the pressure. B- Due to the air trapped inside the ball, the average density of the ball is less than water's density (while the bar's density is higher). C- The bar contains more aluminum so it has a greater weight. D- The buoyant force on the ball is greater because of its smaller volume.
B- Due to the air trapped inside the ball, the average density of the ball is less than water's density (while the bar's density is higher).
The negative sign in Hooke's law indicates: A- The force a spring provides is always weak. B- The force a spring provides is always restoring force: The force always points "inward" to the unstretched/uncompressed location. C- The force the spring provides is always downward D- The force the spring provides is always a push and not a pull.
B- The force a spring provides is always restoring force: The force always points "inward" to the unstretched/uncompressed location.
You drop a bag of apples on a hanging scale at the grocery (it is not digital). It bounces around for a while before reaching equilibrium. What do you see on the scale during the bouncing process? A- the scale reads zero until the bouncing stops B- The reading oscillates, with a higher weight showing when it is lower than the equilibrium point and a lower reading when it is higher than the equilibrium point. C-The reading oscillates, with a lower weight showing when it is lower than the equilibrium point and a higher weight showing when it is higher than the equilibrium point. D- The scale reading reads the correct weight regardless of bouncing.
B- The reading oscillates, with a higher weight showing when it is lower than the equilibrium point and a lower reading when it is higher than the equilibrium point.
The brake system in most cars makes use of a hydraulic system. This system consists of a fluid filled tube connected at each end to a piston. Assume that the piston attached to the brake pedal has a cross sectional area of one half a square inch and the piston attached to the brake pad has a larger cross section area (say two square inches). According to Pascal's principle, when you apply a force of 10 pounds (~45 N) to the piston attached to the brake pedal, the force at the brake pad will be: A-smaller than 45N (but not zero). B- larger than 45N. C- zero D- equal to 45N
B- larger than 45N
The pressure gradient set up in water standing is a glass is an example of ________ ________ , while variations in pressure due to water flowing faster in the smaller parts of a pipe are a type of _______ ________ . A-homogeneous variation; inhomogeneous variation B- static variation; dynamic variation C-static constancy; static variation D-dynamic variation; dynamic constancy
B- static variation; dynamic variation
If an atom or molecule had no energy of motion in kinetic energy, rotational energy or vibrational energy, what would be its temperature? A-0º Celcius. B-0 Kelvin C-0º Fahrenheit. D-room temperature.
B-0 Kelvin
The ball that is shown in the image is moving to the right. As seen from above, the spin is clockwise. This spin will influence the ball's motion. How? A-the ball will have a downward deflection B-The ball will have a deflection out of the screen (towards you). C-the ball will have an upward deflection. D-The ball will have a deflection into the screen (away from you).
B-The ball will have a deflection out of the screen (towards you).
What is the advantage of adding fuzz to a tennis ball? A-The fuzz increases the likelihood of lift forces. B-The fuzz triggers turbulence layers that decrease the size of the turbulent wake that can create drag. C-The fuzz decreases viscous drag forces. D- The fuzz deters physics gremlins from snatching the ball mid-flight.
B-The fuzz triggers turbulence layers that decrease the size of the turbulent wake that can create drag.
Your apartment has two bathrooms. You are taking a warm shower, but your roommate flushes the toilet in the other bathroom. What is the most likely problem this will cause? A-The toilet flush increases the flow of cold water in the pipes, increasing the pressure of the cold water and making your shower colder. B-The toilet flush increases the flow of cold water in the pipes, decreasing the pressure of the cold water and increasing the temperature of your shower. C-The toilet flush increases the pressure in the pipes and your roommates "sewer water" could spurt out the drain. D-The toilet flush creates a shock wave in your pipes and could cause the knocking known as a "water hammer."
B-The toilet flush increases the flow of cold water in the pipes, decreasing the pressure of the cold water and increasing the temperature of your shower.
the rear rotor (propeller) of a helicopter is actually mounted on the side, not the back. Helicopters get their forward thrust by tilting forward, converting part of the lift to thrust, and the rear propeller is mounted sideways to eliminate one of the problems with the top rotor/propeller, namely: A- Stall from increased turbulence at high speeds. B-Torque on the craft via conservation of angular momentum. C-Shock waves from the tips of the top blades spinning faster than the speed of sound. D-Shock waves from the central parts of the top blades spinning faster than the speed of sound.
B-Torque on the craft via conservation of angular momentum.
Cities and towns choose to use water towers to supply water to because: A-Water pressure at the top of the tower is transmitted through the water pipes. B-Water pressure at the bottom of the tower is much higher than at the top. C-The water tower has a vault of air that is pressurized. D-Water moves fastest at the bottom of the water tower and this speed is transmitted uniformly throughout all water pipes below.
B-Water pressure at the bottom of the tower is much higher than at the top.
the SI units of a spring constant are: A-newtons(N) B-newtons per meter(N/m) C-newton-meter(Nm) D-meters(m)
B-newtons per meter (N/m)
you are riding a bus, and as it makes a sharp right turn, you find yourself pressed against your friend, who sits on your left. the net force you experience as the bus turns is: A-left B-right C-forwards D-about halfway between forwards and to your left
B-right
For an object falling through air (or another fluid), there is a point where the drag forces (through viscous drag or through a turbulent wake) will balance the gravitational force. At this point, the object will stop accelerating downward and have a constant speed. This speed is known as the: A-initial velocity B-terminal velocity C- Eiffel velocity D-airfoil velocity
B-terminal velocity
Which of the following describes a side-to-side force on a curveball, caused by a greater path-length and airflow speed on one side of the ball versus the other? A-the drag force B-the Magnus force C-the thrust force D-the viscous force
B-the Magnum force
you are an elevator operator in a posh apartment building. you notice that you feel extremely light whenever the elevator stops moving: A-downward or starts moving downward B-upward or starts moving downward C-downward or starts moving upward D-upward or starts moving upward
B-upward or starts moving downward
Why is a bank on a race-car track useful to help the cars make fast, sharp turns? 1) The normal force from the bank is now directed partially inward, and this support force then is able to help the car turn. 2) The static friction force from the wheels alone cannot provide enough inward-directed force to cause the fast-moving car to turn.
Both one and two
In a closed pipe with a uniform diameter (that makes many twists and turns, including changes in height), which of the following is constant? A) the water pressure (pressure potential energy). B) the water's gravitational potential energy. C) the flow speed (kinetic energy).
C only
You have a spring and a bag of apples. You hang the apples on the spring and measure the stretch of the spring. Then you give the spring and apples to your friend, who is traveling to the Moon. When your friend does the same experiment on the Moon, the stretch of the spring is: A- Zero: Physics gremlins have stowed themselves on your friend's spaceship and eaten the apples. B- Longer: The spring constant is increased on the Moon C- Shorter: The gravitational acceleration constant on the Moon is smaller, so the force on the scale is smaller. D- Unchanged: The experiment uses the same spring and the same bag of apples..
C- Shorter: The gravitational acceleration constant on the Moon is smaller, so the force on the scale is smaller.
You are visiting a pet store and looking at decorations to place in a fish tank. You are concerned that a solid plastic "diver" decoration should need to have its base embedded in the gravel at the bottom of the tank, while a rock of the same volume does not have this concern. Which of the following statements is true, and explains your concern? A- The buoyant force on the diver from the water is greater than the buoyant force from the water on the rock, EVEN THOUGH their weights are probably about same. B- Physics gremlins are more likely to steal a plastic diver ornament than a rock. C- The weight of the diver is less than the weight of the rock, EVEN THOUGH the buoyant forces on each object from the water will be about the same. D- The weight of the diver is probably less than the weight of the rock, AND the buoyant force on the plastic from the water is greater than the buoyant force of the water on the rock.
C- The weight of the diver is less than the weight of the rock, EVEN THOUGH the buoyant forces on each object from the water will be about the same.
which of the following DOES NOT have constant velocity? A-a rider on a truck that is stopped at a red light B-a rider in a car that is moving forward at constant speed C-a rider on a bus that is making a turn at constant speed D-none of the above
C- a rider on a bus that is making a turn at constant speed
You are swinging in a set of spinning swings at the fair in the image below. You are in the middle of the ride. What is the direction of your velocity (in your frame of reference)? A-upwards B-backwards C- forwards D- downwards
C- forwards
A log is floating on a lake. What is the direction of the buoyant force, and its relative strength as compared to the weight of the log? A-The buoyant force is down, and equal to the weight of the log. B- The buoyant force is down, and greater than the weight of the log. C-The buoyant force is up, and equal to the weight of the log. D-The buoyant force is up, and greater than the weight of the log.
C- the buoyant force is up and equal to the weight of the log
A sumo-wrestler decides to go bungee-jumping. After his jump, you notice that the bungee cord's equilibrium length is now longer than the original unstretched length. What likely happened to the bungee cord? A- the cord's spring constant has been lowered B- the cord's spring constant has been increased C- the cord was stretched past its elastic limit D- the cord has been uncalibrated
C- the cord was stretched past its elastic limit
You are in a car and it is turning left. You notice the fuzzy dice hanging from the dash of the car are swinging right. What causes this? A-there was wind pushing the dice right B- there is tension force from the string pulling the dice right C- the inertia of the dice keeps them moving forward as the car (and you) turn left underneath the dice D- physics gremlins have cast a spell on the fuzzy dice
C- the inertia of the dice keeps them moving forward as the car (and you) turn left underneath the dice
You are spinning a toy yo-yo in a vertical loop, with the yo-yo moving at constant speed. When is the tension force on the yo-yo's string the least? A- when the yo-yo is at the back side of the loop B- when the yo-yo is on the front side of the loop C- when the yo-yo is at the top of the loop D- when the yo-yo is at the bottom of the loop
C- when the yo-yo is at the top of the loop
Which of the following actions or design features will help prevent stalling? A-increasing the curvature of the wing. B-Incresing the angle of attack (the angle between an airplane wing and the forward motion). C-Having structures that trigger turbulent boundary layers on the surface of the wing (similar to the fuzz on tennis balls). D-Travelling faster than the speed of sound.
C-Having structures that trigger turbulent boundary layers on the surface of the wing (similar to the fuzz on tennis balls).
The restoring force a spring provides is proportional to the stretch of the spring and the spring constant. This is known as: A-Archimedes'Principle. B-Bernoulli's Law. C-Hooke's Law D-Pascal's Principle
C-Hooke's Law
In order for a fluid flow to be well-modeled by Bernouli's equation (which asserts that energy per unit volume (in terms of pressure potential energy, kinetic energy, and gravitational potential energy) is constant within a flow, which of the following is not true? A-The fluid must be incompressible (have little to no variation in density). B-The fluid must have little to no viscosity (negligible friction effects within the flow). C-The fluid must be moving in a closed pipe with no bends or curves. D-The flow must be in steady-state (have smooth streamlines with well-established speeds).
C-The fluid must be moving in a closed pipe with no bends or curves.
You have a 1-liter bottle full of helium made of stiff plastic. You triple the helium in the bottle, but its temperature and volume remain unchanged. Which of the following remains the same? A-The weight of the bottle and its contents. B-The buoyant force on the bottle and its contents. C-The net force on the bottle and its contents. D-The pressure in the bottle.
C-The net force on the bottle and its contents.
You are using a hand-pump to pump up a bicycle tire. Even though air is compressible, it is still a fluid and your text's discussion on pg 134 about water pumps is still valid (hint, hint). In the process of pumping up the tire, you pull a piston outward (when you draw the handle up) and push it inward (when you push the handle down). Which of the following statements is true: A-You do more work when you pull the handle up than when you push it down. B-You do no work because the work you do on the air is negative in one direction and positive in the other. C-You do more work when you push the handle down than when you pull it up. D-You do the same amount of work when you pull the handle up as when you push it down.
C-You do more work when you push the handle down than when you pull it up.
Daisy Duke is traveling at a speed over a hill in her white jeep. as she clears the top of the hill, she feels a sensation resembling weightlessness. why? A-her mass has decreased B-her weight has decreased C-the normal force from her seat has decreased D-the gravitational acceleration has decreased
C-the normal force from her seat has decreased
You are riding in a car. It is braking. The direction of the acceleration is in what direction? A- right B-forwards C-left D- backwards
D- backwards
Whenever the net force on an object is zero, the object: A- is calibrated B- is in rotational equilibrium C- obeys Hooke's law D- is in transitional equilibrium
D- is in transitional equilibrium
A volleyball player throws a ball downward into the soft sand and it doesn't bounce back. What happened during this process? A- kinetic energy of the ball dispersed as gravitational potential energy B-gravitational potential energy of the ball dispersed as chemical potential energy C-chemical potential energy of the ball dispersed as thermal energy D-kinetic energy and gravitational potential energy dispersed as thermal energy
D- kinetic energy and gravitational potential energy dispersed as thermal energy
Which car in a rollercoaster offers the most excitement due to increased feelings of weightlessness? A- the feeling is the same regardless of which car you are assigned B-the second car C-the first car D-the last car
D- the last car
You and your identical twin (who weighs the same as you) hang some bungee cords from the ceiling of your room and add a board to make a seat. You sit in it and observe that while it stretches some length, you are still well above the floor. When your identical twin joins you in the seat,the bungee cords stretch: A- half as much B- the same amount C- four times as much D- twice as much
D- twice as much
You work with a catering firm and have been given a challenge. There are several identical liquid beverage dispensers sitting on a table, and they have horizontally directed spouts. You have been asked to have to rank the dispensers in order of their contents (which one is fullest, next fullest, etc.) Having had a physics class, you decide to open the spouts and compare where the streams land on the ground below. In terms of how far each stream lands from the jug, which of the following statements is correct: A- The pressure (and hence water level) has no effect on speed. Your experiment will not help you determine water level rankings. B- The pressure (and hence water level) is lower when the speed is lower. Lower speeds result in larger ranges and the streams will land further from the jug. C-The pressure (and hence water level) is higher when the speed is lower. Lower speeds result in smaller ranges and the streams will land closer to the jug. D-The pressure (and hence water level) is lower when the speed is lower. Lower speeds result in smaller ranges and the streams will land closer to the jug.
D-The pressure (and hence water level) is lower when the speed is lower. Lower speeds result in smaller ranges and the streams will land closer to the jug.
At a critical point during lift-off, a vortex is shed off the wing, that establishes a longer and faster airflow over the top surface than the bottom. When this flow is established, what can be said about the relative pressures above and below the wing? A-The pressures above and below the wing are both greater than atmospheric pressure. B-The pressure above the wing is greater than atmospheric pressure and then pressure below is less. C-The pressures above and below the wing are both less than atmospheric pressure.. D-The pressure above the wing is less than atmospheric pressure and then pressure below is more.The pressure above the wing is smaller than the pressure below the wing.
D-The pressure above the wing is less than atmospheric pressure and then pressure below is more.The pressure above the wing is smaller than the pressure below the wing.
A bag of sugar bounces well when you toss it on a piece of stretched rubber, but when it misses the stretched rubber surface and hits the hard floor, it doesn't bounce well. Which of the following does NOT help explain this? A-The amount of collision energy converted to rebound energy depends on both what the ball is made of and how the surface responds. B-The rubber surface deforms elastically as it slows down the falling bag and stores more of the collision energy. C-Collision energy is lost to friction forces as the sugar shifts in the bag when it lands on the hard floor. D-The sugar has more momentum when it hits the rubber surface than when it hits the hard floor.
D-The sugar has more momentum when it hits the rubber surface than when it hits the hard floor.
You crack open a can of "The Fizzicist" (a soda sold at Dillon's that is similar to Dr. Pepper). After you pour it into a glass, you notice some bubbles of carbon dioxide (CO2) are rising within the fluid. Which statement is true? A- The weight of the fluid displaced is equal to the weight of the bubble of CO2. B- The Fizzicist was brewed by physics gremlins, who enchanted the beverage. C- The weight of the fluid displaced is less than the weight of the bubble of CO2 D- The weight of the fluid displaced is greater than the weight of the bubble of CO2.
D-The weight of the fluid displaced is greater than the weight of the bubble of CO2.
your friend is leaning out the 5th story window of a skyscraper with a very long (100 m) straw, trying to drink water from a glass you are holding on ground level. He or she will find that: A-Easier than sucking water up a 10-cm straw. B-Just as easy as sucking water up a 10-cm straw. C-This task is difficult, but not impossible. D-This task is impossible.
D-This task is impossible.
Suppose you had a very long (and flexible) straw that could reach from a cup of water on the ground level to the top of a very tall building (say One Kansas City Place, shown below, which has a 42nd floor at ~600m above ground level). When you suck on the straw in order to bring water up: A-You can drink the water only at a typical straw length, because water is too thick to be pulled up in the straw by more than a few inches. B-You could drink the water at any height (even 600m) with no problem. C-You cannot drink the water through the straw at at... because only physics gremlins can use straws that long D-You could bring the water up to only a certain height in the straw because the atmosphere pushes down on the surface of the water by a given amount.
D-You could bring the water up to only a certain height in the straw because the atmosphere pushes down on the surface of the water by a given amount.
which of the following doesn't help explain why mountain climbers say the air is much "thinner" at high altitudes? A-the density of air is lower at high altitudes B-gravity pulls air molecules closer to the surface of the earth C-air is compressible D-air molecules lose mass at high altitudes
D-air molecules lose mass at high altitudes
Which of the following will INCREASE the likelihood that a flow around an obstacle is laminar (low Reynold's number)? A-increasing the obstacle's size B-decreasing the fluid's density C-decreasing the fluid's viscosity D-decreasing the fluids speed
D-decreasing the fluids speed
You are trying to deliver water to a sink in the tree house in your backyard. You run an old hose from the spigot behind your home, across your yard, and up the tree to a sink inside the tree house. You let water fill the hose all the way to the tree house sink and then leave the hose pressurized overnight, with no water flowing in it (there is a valve at the open end which you have shut). Unfortunately, the hose cannot tolerate high pressure anymore and it springs a leak around midnight. By morning your whole backyard is a swamp. The most likely site for the leak is: A-on the way up the tree—the most vertical portion of the hose. B-at the spigot—the first point on the hose. C- at the sink—the highest point on the hose. D- on the ground—the lowest point on the hose.
D-on the ground—the lowest point on the hose.
Which of the following terms best describes when a flow has eddies, vortices and churning...as opposed to smooth streamlines? A- wake deflection B-viscosity C- laminar flow D- turbulence
D-turbulence
True or false: A spring that is "soft" has a smaller spring constant than one that is "firm," meaning that the soft spring will stretch or compress more for a given amount of applied force.
TRUE
True or False: You are dropping an object to see how well it bounces. The likelihood and quality of a bounce depends on the composition of both the object being dropped and the characteristics of the surface onto which you are dropping the object.
True
Spring A is "softer" than spring B. True or False: The spring constant of spring A is larger than the spring constant of spring B.
false
True or false: A laminar flow is characterized by vortices and is more often associated with viscous fluids like honey.
false
True or false: When you are in a roller-coaster loop-de-loop, your frame of reference will give you the correct insight into the forces present on you.
false
True or false: The force that contributes to forward motion of a vehicle, such as an airplane, is known as lift.
false; known as thrust
True or false: The SI unit of pressure is the pound(lb).
false; pascal
Some European toilets have a small, wall-mounted tank high above the toilet, instead of a larger tank low down. True or false: The water in a wall-mounted tank has additional gravitational potential energy that can be converted to kinetic energy when the tank valve is opened to flush the toilet. This allows an effective flush, even though less water is used.
true
Spring A is "softer" than spring B, but they are the same equilibrium length. The springs are held vertically, and equal weights are suspended from the bottom. True or False: For a given amount of applied weight, spring A will stretch more than spring B.
true
True or false: A ball floats when placed in salt water, but sinks when placed in tap water. True or false: The density of the salt water is greater than the density of the tap water.
true
True or false: In order to make a successful loop-de-loop, a rollercoaster starting from rest must start from a position that is higher than maximum height of the loop.
true
True or false: When you decrease the temperature of a sample of gas molecules but do not change the volume of their container, the pressure inside the contain decreases.
true