physics

7. Two blocks each with mass m are connected by strings and pulled with constant acceleration a.What is the relationship between the tension in each of the strings? a.Ti > Ta (b.) T2> TI c) T1 = T2 d) T1 = T2 = 0

(b.) T2> TI

Given vectors À = 3i - 2j + k and B = 2j+k, what is À • B? What is the angle between À and B? 3t+4k, 51 4, 69 -4, 141 -3, 111 3, 21

-3, 111

The Benjamin Franklin Bridge spans between Philadephia, Pennsylvania, and Camden, New Jersey. The Bridge is about 9,650 feet long. If the temperature varies from -10°F in December to a high of 100°F in the middle of July, how much might the length of the span change over the year? (Assume the αsteel is 12 x 10-6 /K) a)12.7 m b)3.18 m c)1.76m d)11.2 m

. You have to multiply using the ∆l formula and get an answer of 1.76 meters (work above).

Ben leaves his home and walks to the bank, then to the park. What is his displacement when he returns home? 7 blocks 10 blocks 5 blocks 0 blocks

0 blocks

The London Eye is a Ferris wheel with a diameter of 120 m. The wheel rotates with a speed of 26 cm/s. What is the displacement of a person traveling in one of the pods attached to the rim of the wheel after the wheel has made one complete revolution? 380 m 0 m 120 m 750 m

0 m

You are standing on a truck bed. The truck is accelerating at 0.77g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide and fall off the truck? a) 0.77 b) 1.3 c) 74 d) 5.8 e) None of the above

0.77 (correct)

8. After buying groceries at HEB you return your grocery cart to the cart corral.Being a good citizen, you collect another cart and stack it with yours. You give the two interlocked carts a shove so that they are traveling at 1.2 m/s when they hit a cart already in the corral and lock it in place. How fast ddes the train of carts move off together after the collision? a. 0.30 m/s 0.80 m/s 0.40 m/s 1.2 m/s e. 1.5 ml

0.80 m/s

Question: A 2 kg block is pushed 5 meters across a horizontal surface with the force of 10N. The surface is frictionless. How much work is done on the block? Answer Choices: 1. 50 J 2. 25 J 3. 10 J 4. 0 J

1. 50 J

A child is pulling a sled with a rope that is 30 degrees below the horizontal. He exerts a horizontal force of 20 N to pull the sled 40 m. When he reaches 40 m, he realizes he dropped his mitten 10 m behind him, and he pulls the sled using the same force to retrieve his mitten. Determine the work done by the child on the sled once he reaches his mitten. 1. 870 J 1. 93 J 1. 520 J 1. 300 J

1. 520 J

A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the distance covered by the car during this time? Answer Choices: 1. a) 50 m 2. b) 100 m 3. c) 200 m 4. d) 25 m

1. a) 50 m

A stone is thrown vertically upward with a speed of 18.0 m/s. For each question below, give both the numerical answer and the unit in the appropriate blank. How fast is it moving when it is at a height of 11.0 m? How long does it take to reach this height?

10.4 m/s ; .77s

The figure at right shows a graph of the velocity of an object as a function of time. What is the acceleration of the object at t = 1.0 s? 10m/s^2 0m/s -5m/s^2 10m/s -10m/s^2

10m/s^2

A position of a mass on a spring is given by the equation x(t) = (1.7m) cos (8.56t). Calculate the maximum velocity of the oscillation? 1. 1.7 rad/s 2. 8.56 rad/s · 14 rad/s 1. 120 rad/s

14 rad/s

11. A boat is headed east across a river with a speed of 16 m/ (relative to the water). The river is flowing to the south with a speed of 3.4 m/s. The velocity of the boat relative to the riverbank is 16.4 m/s, 12° S of E 16.4 m/s, 78°S ofE 19.4 m/s, 15° S of E d. 12.6 m/s, 15° N of E

16.4 m/s, 12° S of E

On earth, you can jump a vertical distance of 42 cm. You are standing on an asteroid which has a mass of1.1 x 1014 kg. To your surprise, you find that you can attain escape velocity just by jumping. Estimate the minimum radius of the asteroid. (G = 6.67 × 1011 N • m?/kg?) 42 m 1800 m 3600 m 890 m 3200 k

1800 m

What average force is required to stop a 986-kg car within a distance of 175 m if the car is traveling 92.3 km/h? 1850N 1.88m/s^2 524N 3710N

1850N

Sam plans to know the safety of the roller coaster. Suppose the average mass of a passenger is 70kg, and the mass of the car is 1000kg. The car can take ten people each time. The movement of the car is first perpendicular to the ground, then it passes a circle whose bottom is on the ground, and the radius of it is 20m. The metal of the roller coaster can bear the force of 60000N. What is the highest height to release the car in a safe range? 1. 36m 2. 26m 3. 46m 4. 10m

2. 26m

Roller derby tracks are banked so that the skaters can navigate the turns at high speeds. A 62-kg racer is going around a banked curve with a radius of 8.1 m at a steady speed of 5.4 m/s. What is the appropriate banking angle so that the skater can navigate this turn without the assistance of friction? ) 20° b. 4.6° c. 32° d. 49° e. 270

20°

If a force F(x) = 4x^3 - x^2 - 2x N is applied to an object over the interval x = [1.00, 4.001, what is the work done in moving the object from x = 1.00 m to x = 4.00 m? 67.3J 92.7J 137J 189J 219J

219J

A ball is thrown horizontally from the roof of a building at a speed of 10.1 m/s and lands 21.9 m from the base of the building. How high is the building (in meters)?

23m

An object moves along a track. Its position as a function of time is given by the equation x =At^2 + B, where A = 3.10 m/s? and B = 4.85 m. Determine the magnitude of the instantaneous velocity at t = 5.00 s. 82.3 m 31.0 m 6.20 m 218

31.0 m

What average force is required to stop a 986-kg car in 7.75 s if the car is traveling 92.3 km/h? (force and units)

3260 N

A closed pipe has a length of 67.8 cm and a diameter of 1.23 cm. What is the frequency of the third harmonic for this pipe? 1. 379 Hz 2. 3.79 Hz 3. 674 Hz 4. 2091 Hz 5. 127 Hz

379Hz

How many significant digits should be written in the sum 14.08 kg + 280 g + 275 mg? 4 6 5 8

4

dentify the number of significant figures in 0.002608 L and rewrite it in scientific notation. 4, 2.608 x 10^(-3) L 3, 2.608 x 10^(-3) L 4, 2608 x 10^(-6) L 5, 0.2608 x 10^(-2) L

4, 2.608 x 10^(-3) L

Vector A has x and y components of equal magnitude. Which of the following is a possible direction for A, measured in degrees from the positive x-axis? Mark all that apply. 30 degrees 270 degrees 0 degrees 90 degrees 45 degrees 135 degrees

45 degrees 135 degrees

You drop a rock from an 8th story window. At time t it passes the 7th story window. What window will it be passing at time 2t? Assume the windows are equally spaced. 6th story window 4th story window 3rd story window 5th story window

4th story window

Snow on slippery roofs can be quite dangerous. Consider a chunk of snow at the ridge of a roof with an incline of 24. Assuming that the distance of the chunk of snow to the edge of the roof is 6.0 m and the coefficient of kinetic friction is 0.20, calculate the(speed of the snow when it slides off the roof 5.1m/s 7.7m/s 8.3m/s 14m/s 26m/s

5.1m/s

A block of mass 3.0 kg is sitting on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second black of mass 4.2 kg, which hangs vertically. What is the acceleration of the system of blocks in m/s2?

5.7

4. A solar sail accelerates by collecting photons from the sun. The acceleration is very small but acts over a very long time. Suppose a spacecraft equipped with a solar sail has an acceleration of 0.058 mm/s^2. By how much will the craft's speed have increased after one month of travel (assume 30 days in one month)? 15 km/hr 280 km/hr 540 km/hr 1400 km/hr

540 km/hr

A rocket on earth is launched at a 45° angle and travels a distance d. The acceleration due to gravity on the moon is about 1/6 of that on Earth. On the moon, the same rocket launched at this angle would travel d 6d 36d 18d

6d

A small asteroid having a radius of 1420 km exerts a gravitational force of 36 Non a space probe that is 1780 km above its surface.As the probe approaches the asteroid, what is the gravitational force acting on the probe when it is 850 km above the surface of the asteroid? 8.2 N 17 N 160 N 72 N 63N

72 N

A parrot that weighs 10 N is sitting on its perch in a birdcage (weight = 7 N), which in turn is sitting on a scale. The parrot launches itself off of its perch to land on a higher platform. What is the reading on the scale when the parrot launches itself off of its perch? 7 N > 17 N >7 N, but < 17 N 17 N

> 17 N

counterclockwise angular velocity of 8.0 rad/s, an average counterclockwise torque of 4.0 Nm is applied for 4.0s. What is the change in angular momentum of the wheel? A. 16 (kg.m2)/s B. 48 (kg.m2)/s C. 32 (kg.m2)/s D. 8.0 (kg.m2)/s

A. 16 (kg.m2)/s

A soccer player strikes the ball towards the opposing team's goal. The ball travels along the ground with an initial rotational velocity of 630 rev/min before rolling into the hands of the goalkeeper. If the ball takes 1.4 seconds to reach the goalkeepers gloves, and it takes 85 revolutions on its' way to the goal, what is the final angular velocity of the ball as it reaches the goalkeeper? A) 55 rev/min B) 530 rev/min C) 580 rev/min D) 730 rev/min

Answer B is the correct answer of 530 rev/min

43.5 g of nitrogen gas is in a 47-L container at 45℉, what is the pressure of the container, considering that nitrogen is an ideal gas? 1. 73 atm 2. 20 atm 3. 0.1 atm 4. 0.7 atm 5. 1.4 atm

Answer D is correct

Problem: A particle is launched vertically from the ground with an initial velocity of 25.0 m/s. The particle experiences uniform acceleration due to gravity (9.81 m/s2). Determine the time of flight of the particle and the maximum height that the particle reaches. a. maximum height = 32 m, time of flight = 5.1 s b. maximum height = 31.9 m, time of flight = 2.55 s c. maximum height = 31.9 m, time of flight = 5.10 s d. maximum height = 123 m, time of flight = 5.10 s

Answer: c. maximum height = 31.9 m, time of flight = 5.10 s

Suppose the temperature (°C) of a gas is decreased by a factor of 4. By what factor does the Vrms change? 1. 2 2. ½ 3. 4 4. ¼ 5. Cannot be determined from this information.

Answer: e. cannot be determined from this information.

A car is moving in such a way that its speed is Increasing 'over time. We don't know which way the car is traveling. Which of the following graphs could represent the car's motion?

B

You walk down Dutton Avenue. A lifted pickup truck blasting God's Country drives past you. After is passes you and zooms away, the frequency of sound that you hear is a. Higher than the actual frequencyb. Lower than the actual frequencyc. Equal to the actual frequencyd. THIS IS GOD'S COUNTRYYYY

B is the correct answer. This is because, as the truck moves away at speed, the sound waves are stretched out.

A physics student is experimenting with waves having an angular frequency (ω) of 400π rad/s and a wavelength (λ) of 2 m. Wavelength is denoted as k=2π/λ​ in relation to the wavenumber. If the angular frequency is doubled while the wavelength remains constant, what will happen to the wave speed? A) The wave speed will be halved.B) The wave speed will double.C) The wave speed will remain unchanged.D) The wave speed will decrease by a factor of ¼.E) The wave speed will increase by a factor of 4.

B) The wave speed will double

Charlie is driving down a road at a constant speed of 50 mph when suddenly, he sees a "School Zone 20 mph" sign 0.0625 miles away. At this moment he takes his foot off the accelerator and presses on the breaks with a deceleration of 1.9 m/s2. At what speed will he pass the school zone sign? If there is a police officer parked 0.075 miles away, will Charlie get pulled over? 39. 0 mph, Yes. 40. 24 mph, No. 41. 39 mph, Yes. 42. 0 mph, No.

B: Is the correct answer.

A 1100-kg car accelerates from rest at a constant rate of 8.0 m/s2. Which of the following graphs best represents the car's motion as a function of time?

C

Given the two vectors A and B below, which vector represents A + B?

C

Which of these graphs represents v (velocity) vs. t (time) for a dropped ball hitting the floor and bouncing back up?

C

block of mass marests on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block with mass m, which hangs vertically. What is the acceleration of the system and the tension in the cord?

C

Which of the following equations correctly expresses the relation between vectors a→,b→, and c→, as shown in the figure?

C = A+B A+B+C = 0 A = B+C B = A+C

A spring at equilibrium position stretches 18 cm when a force of 6.3 N is applied. How much farther will the spring stretch when an additional 1.4 N force is applied? A) 0.35 cmB) 22 cmC) 4.0 cmD) 40 cm

C) 4.0 cm

Tony's Pizzeria's most popular selling pizza is the 16-in. house special. Tony's pizza ovens are maintained at the heat of 400 °F. What would the diameter of an unbaked pizza tossed at 60 °F have to be in order for it to expand to 16 in. in the oven? Assume that pizza dough has a coefficient of thermal expansion of 1.3 x 10^-3 1/K and the diameter of the pizza is the only significant dimension in finding the diameter of the unbaked pizza. A. 20 in. B. 9.0 in. C. 12 in. D. 31 in. E. 4 in.

C. 12 in.

You are trying to put a copper ring over an iron rod, but it seems that the ring you purchased was just barely too small to fit. The iron rod has a diameter of 5.000cm, and after further inspection, you realize that your copper ring had an inner diameter of merely 4.955cm. In order to comfortably fit the ring over the rod, it will also need to have a diameter 0.005cm greater than the rod. Rather than giving up and buying a new ring, however, you put your physics knowledge to the test and heat up the ring in an attempt to make it fit. Assuming you are in a 20 degree Celsius room already, what will the minimum temperature be to get the ring over the rod? A) 613.5 degrees Celsius B) 554.2 degrees Celsius C) 608.2 degrees Celsius D) 860.9 degrees Celsius E) 221.8 degrees Celsius

Correct Answer: A.

A car traveling at a constant speed of 20.0 m/s passes a police car at rest. The police car starts moving 3.0 seconds after the car passes, accelerating uniformly at 4.0 m/s². How long will it take for the police car to catch up to the speeding car? Answer Choices: · A. 5 seconds · B. 12 seconds · C. 15 seconds · D. 17 seconds · E. 20 seconds

Correct Answer: C. 15 seconds

A small heavy box of emergency supplies is dropped from a moving helicopter at point A as it flies along in a horizontal direction. Which path in the drawing below best describes the path of the box (neglecting air resistance) as seen by a person on the ground?

D

Which path correctly indicates the motion of the pendulum bob when it is cut at the instant it is at the top of its swing?

D

A sealed rigid container undergoes a thermodynamic process and has a change in internal energy. If the heat added to the container is equal to the work done by the system, which process is happening? 1. A) Isothermal B) Adiabatic C) IsobaricD) Isolitic E) Isochoric/Isovolumetric

E) Isochoric

3. A constant force is applied to an object opposite the direction of its motion. What happens to the object's (kinetic energy? (Assume that this is the only force acting on the object--no friction.) It remains constant. It becomes zero. It only decreases It only increases.. It depends on the distance over which the force is applied

It depends on the distance over which the force is applied

1,000,000,000,000 bulls is equal to ______. Gbull Mbull Tbull Pbull

Tbull

A rock is thrown straight up, rising to a maximum height before falling back down. Choose the true statement: a. The acceleration decreases to 0 at the top, and increases on its way back down b. The velocity is constant the entire trip c. The acceleration is constant the entire trip d. Both the velocity and acceleration decrease on the way up and increase on the way down

The acceleration is constant the entire trip

A 350 g mass is attached to a spring (k = 33 N/m) and is pulled 3.8 cm back from its equilibrium position and let go. What is the maximum acceleration the mass experiences, and where does it occur in relation to the equilibrium position? a) 3.6 m/s2 , at the equilibrium position b) 3.6 m/s2, 3.8 cm from the equilibrium position c) 0.37 m/s2, 3.8 cm from the equilibrium position d) 0.36 m/s2, at the equilibrium position e) 1.8 m/s2, 3.8 cm from the equilibrium position

The correct answer is B, 3.6 m/s2, 3.8 cm from the equilibrium position

Waves travel through a 15kg rod made of unknown metal with a velocity of 1300m/s. The rod is 3.0m long with a diameter of 5.0cm. If a compressive force of 6300N is applied to the rod, what is its change in length? A)0.7mm B)8.9mm C)2.2mm D)2.9m E) Needs more information to solve.

The correct answer is C, 2.2mm.

A police car with a siren emitting a sound of frequency 500 Hz is moving towards a stationary observer at a speed of 30 m/s. The speed of sound in air is 340 m/s. What frequency does the observer hear? Answer Choices:A. 522 HzB. 488 HzC. 548 HzD. 569 HzE. 500

The correct answer is C. 548 Hz. · f' is the observed frequency. · f is the source frequency (500 Hz) · v is the speed of sound (340 m/s). · vo is the speed of the observer (0 m/s, as the observer is stationary). · vs is the speed of the source (30 m/s). f'=f((v+vo)/(v-vs)) f′=500 Hz(340 m/s−30 m/s340 m/s+0 m/s) f′=500 Hz(310 m/s / 340 m/s​) f′= 500 Hz×1.0968 f′≈548.4 Hz

Compute the result of the following equation using the correct number of significant figures and units: (3.53 s)(34 m/s) + (8.1 s)(12.6 m/s) = 1. 222 m 2. 222 m/s 3. 220 m/s 4. 220 m

The correct answer is d as it would 120 + 102 which equals 222 but only 2 sig figs is 220 and the correct units are m as the s cancel.

You have 52 grams of Oxygen gas in a container with a volume of 40 liters and a temperature of 126 °C, what is the pressure inside the container in pascals? A. 130kpa B. 1.3pa C. 270kpa D. 43kpa

The correct answer would be answer choice a of 130 kpa

A 200 kg shark swimming at 12.5 m/s devours a 50 kg sturgeon swimming at 5 m/s in the opposite direction. The speed of the shark after just after it eats the sturgeon is a. 10 m/s b. 11.01 m/s c. 11 m/s d. 200 m/s

The correct option is (a) since we use the equation m1v1+m2v2=(m1+m2)vf, and ended up with 11 m/s. But with sig figs it ends up being 10 m/s.

You are trying to push your stalled car. Although you apply a horizontal force of 400 N on the car, it doesn't budge, and neither do you. What other force(s0 must also have a magnitude of 400 N? Check all that apply. The force exerted by the car on you. The friction force exerted by the road on you. The normal force exerted by the road on you. The friction force exerted by the car on the road.

The force exerted by the car on you. The friction force exerted by the road on you. The friction force exerted by the car on the road.

A book is sitting on a desk top. Identify the 3rd law partner of the weight of the book. The force of the book on the earth he force of the desk on the book. The force of the book on the desk. The force of the earth on the book.

The force of the book on the earth

If the eastward component of vector 𝐴⃗ is equal to the westward component of vector 𝐵 ⃗⃗ and their northward components are equal. Which one of the following statements about these two vectors is correct? a. The magnitude of vector 𝐴⃗ is twice the magnitude of vector 𝐵 ⃗⃗. b. Vectors 𝐴⃗ and 𝐵 ⃗⃗ point in opposite directions. c. Vector 𝐴⃗ is parallel to vector 𝐵 ⃗⃗. d. The magnitude of vector 𝐴⃗ is equal to the magnitude of vector 𝐵 ⃗⃗.

The magnitude of vector 𝐴⃗ is equal to the magnitude of vector 𝐵

A ping-pong ball collides with a bowling ball. Which experiences the greatest force? The force on each depends on its velocity. The ping-pong ball The bowling ball They experience the same force The force on each depends on its mass.

They experience the same force

A 57-kg woman ascends in an elevator that briefly accelerates at 0.20g upward. She stands on a scale that reads in kg. During this acceleration, what is her weight W, and what does the scale read, S? W = 560 N, S = 68 kg W = 560 N, S = 670 N W = 670 N, S = 68 kg W = 57 kg, S = 45 kg W = 560 N, S = 450 N

W = 560 N, S = 68 kg

A plane has an eastward heading with a speed of 156 m/s (relative to the air). A 20.0 m/s wind is blowing southward while the plane is flying. The velocity of the plane relative to the ground is a. 157 m/s at an angle 7.31° south of east. b. 155 m/s at an angle 7.36° east of south. c. 157 m/s at an angle 7.31° east of south. d. 157 m/s at an angle 7.36° south of east.

a. 157 m/s at an angle 7.31° south of east

A 300 kg snowball is seated at the top of a mountain on the planet Mars whose peak is 10,000m high. If the snowball travels a horizontal distance of 15000 m to the bottom of the mountain, what is the velocity of the snowball at this point? (g =3.7 m/s²) a. 2.7 X 10^2 m/s b. 7.4 X 10^4 c. 3.3 X 10^2 d. 1.1 X 10^5 e. none of the above

a. 2.7 X 10^2 m/s

You are trying to push your stalled car. Although you apply a horizontal force of 400 N on the car, it doesn't budge, and neither do you. What other force(s) must also have a magnitude of 400 N? Select all that apply. a. The force exerted by the car on you. b. The friction force exerted by the car on the road. c. The normal force exerted by the road on you. d. The friction force exerted by the road on you.

a. The force exerted by the car on you. b. The friction force exerted by the car on the road

Ronny Heberson has the fastest recorded soccer shot at 131 mph. Assuming there is no wind resistance, and the ball stops exactly where it lands, what is the theoretical max distance that the ball can be shot? a.) 350m b.) 495m c.) 1751m d.) 247m

a.) 350m

How should we write the result of the following calculation, being careful about significant figures? (5.96s)(52m/s)+(1.02x10^4s)(14.1m/s) a) 144304 m b) 44000 m c) 144304.72 m d. 1.4 x 10^5m e) 14.4 km

b) 44000 m

What is the dot product of (5.1 î + 2.9 ĵ + 12.3 k̂) and (8.4 î + 6.0 ĵ - 2.6 k̂)? Answer in 2 significant figures. a. 92b. 28c. -81 î + 120 ĵ + 6 k̂d. 33

b, because (5.1 x 8.4) + (2.9 x 6.0) + (12.3 x -2.6) = 43 + 17 - 32 = 28.

The figure at right shows a graph of the velocity of an object as a function of time. What is the acceleration of the object at 𝑡 = 6.0 𝑠? a. 10 m/s2 b. 0 m/s c. -5 m/s2 d. -10 m/s e. -10 m/s2

b. 0 m/s

A car is moving with a sped of 32.0 𝑚/𝑠. The driver slams on the brakes, causing the car to slow down with a uniform acceleration with a magnitude of 3.50 𝑚/𝑠2. How far does the car travel after the driver put on the brakes until it comes to a complete stop? a. 112 𝑚 b. 146 𝑚 c. 4.57 𝑚 d. 292 𝑚 e. 9.14 𝑚

b. 146 𝑚

A drone can see objects that are at an angle no smaller than .018 degrees. How small an object can the drone see when gliding at a height of 150 m? a) 47.1 cm b) 2.7 m c) 4.71 cm d) 155 cm

c) 4.71 cm - CORRECT

1. A ball is dropped from the top of a tall building. At the same instant, a second ball is thrown upward from ground level. When the two balls pass one another, one on the way up, the other on the way down, compare the magnitudes of their acceleration: a) The acceleration of the dropped ball is greater. b) The acceleration of the ball thrown upward is greater. c) The acceleration of both balls is the same. d) The acceleration changes during the motion, so you cannot predict the exact value when the two balls pass each other. e.The accelerations are in opposite directions

c)The acceleration of both balls is the same.

A hockey puck slides off the edge of a table with an initial velocity of 28.0 m/s. and experiences no air resistance. The height of the tabletop above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground? a. 12.8° b. 72.6° c. 12.6° d. 77.2° e. 31.8

c. 12.6°

A car can go from 0 to 27 𝑚/𝑠 in 12 𝑠. Assuming it could maintain the same acceleration at higher speeds, how long would it take the car to go from 0 to 55 𝑚/𝑠? a. 16 𝑠 b. 18 𝑠 c. 24 𝑠 d. 28 𝑠

c. 24 𝑠

7. James Walt boasted that one of his steam engines could harness the power of 200 horses at once (a 200 hp engine). How long would it take his engine to lift a load of 690 kg out of a mine 142 m deep? Assume the load moves at a constant speed. 0.66 s 44 s c. 6.4 s 13 s 4800

c. 6.4 s

A block of mass 4.1 kg is being pulled along a horizontal surface by a rope which is attached to it. The rope is held horizontal and has a tension of 53 N. Given that a friction force opposes the motion of the block with a force 16.9 N, what is the acceleration of the block? a. 0 m/s2 b. 6.5 m/s2 c. 8.8 m/s2 d. 36 m/s2

c. 8.8 m/s2

Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object decelerates gradually to rest. is gradually brought to rest and then accelerates in the direction of the second force. quickly stops. continues at the velocity it had before the second force was applied.

continues at the velocity it had before the second force was applied.

When a skier skis down a hill, the normal force exerted on the skier by the hill is less than the weight of the skier. greater than the weight of the skier. depends on the speed of the skier. equal to the weight of the skier

less than the weight of the skier.

Car A is traveling with velocity v. Car B is traveling with velocity 3v. The drivers of both cars see a deer in the road ahead and slam on their brakes. How far does car B travel compared to car A before it comes to a stop? Assume each car's brakes can supply the same acceleration. one-third as far nine times as far three times as far as far one-third as far

nine times as far

When throwing a ball straight up, which of the following is true about its velocity, v, and acceleration, a, at the highest point in its path? not really sure neither a nor v is zero both v = 0 and a = 0 only a is zero only v is zero

only v is zero

You drop a rock from an 8th story window. At time t it passes the 7th story with speed v. What is the speed of the rock when it passes the 5th story window? Assume the windows are equally spaced. 2v 3v 4v 9v sqrt3v

sqrt3v

Annette and Boris release their snowballs from the same height and at the same time. Annette's is dropped while Boris' is thrown horizontally. Which snowball had the greatest velocity when it hit the ground? the "dropped snowball" the "thrown snowball" they both have the same velocity depends on how hard the snowball was thrown

the "thrown snowball"

In the Mattson Putt, a man attempts to putt a golf ball across the basketball court into the hole for a grand prize of $5,000. The length of the basketball court is 29 meters. The diameter of the hole is 11 cm. What angle 𝜃 is required for the man to make the putt? Assuming a constant acceleration -0.3 m/s2, what should be the minimum initial velocity of the ball to make the putt? 7. 7.6 x 10-3 rad; 2.9 m/s 8. 0.38 rad; 4.2 m/s 9. 530 rad; 0.066 m/s 10. 3.8 x 10-3 rad; 4.2 m/s 11. 3.8 x 10-3 rad; 17 m/s

the correct answer is D.

Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 8.2 m/s. Neither person experiences any significant air resistance. Just as they reach the lake below a. the speed of Alice will always be 8.2 m/s larger than that of Tom. b. the speed of Alice is larger than that of Tom. c. the speed of Tom will always be 9.8 m/s larger than that of Alice. d. they will both have the same speed.

the speed of Alice is larger than that of Tom.

Annette and Boris release their snowballs from the same height and at the same time. Annette's is dropped while Boris' is thrown horizontally. Which one hits the ground first? the "thrown" snowball they hit at the same time the "dropped" snowball it depends on how hard Boris threw it depends on the initial height

they hit at the same time

Four vectors each have the same magnitude, but point in different directions: V1 makes an angle of 30° with the +x-axis V2 makes an angle of 120° with the +x-axis V3 makes an angle of -45° with the +x-axis V4 makes an angle of 210° with the +x-axis Rank the magnitude of the x-component of the vectors from smallest to largest. v2 < v3 < v4 = v1 v4 < v2 < v3 < v1 v3 < v4 < v2 < v1 v4 = v2 < v3 = v1

v4 < v2 < v3 < v1

On a frictionless ice rink, two hockey pucks traveling straight lines towards each other collide in a completely elastic collision. Puck A weighs 170 g and travels at 35.6 m/s. Puck B weighs 110 g. After the collision, Puck A is traveling at 10.3 m/s and Puck B travels at 45.7 m/s. What was the original velocity of Puck B? 1. 17.1 m/s 2. 5.4 m/s 3. 29.38 m/s 4. 2.57 m/s 5. 6.6 m/s

vb2= 5.4 m/s

You are watching a parade when a float goes by with speed vf where a child is throwing darts at a target at the front of the float with speed vd. You measure the speed of the darts to be vd + vf vd vd - vf vf

vd + vf

The period of a pendulum T, the time it takes to make one complete oscillation, depends on the acceleration due to gravity g and the length of the pendulum L: T = gxLy. Use dimensional analysis to find the values of x and y. x = 1/2, y = 1/2 x =- 1/2, y = 1/2 x = 1/2, y = -1/2 x =- 1/2, y = -1/2

x =- 1/2, y = 1/2