Concepts Unit 1, 2 , 3, 4 , 9
A commemorative coin that sells for $40 is advertised to be plated with 15 mg of gold. Suppose gold is worth about $50 per gram. Which of the following best represents the value of the gold in the coin? Select one: a. $750 b. $0.75 c. $3.33 d. $0.33
$0.75
You throw a ball straight up with an initial velocity of 15.0 m/s. It passes a tree branch on the way up at a height of 7.00 m. How much additional time will pass before the ball passes the tree branch on the way back down? Select one: 0.574 s 0.956 s 1.53 s 1.91 s
1.91 s
If a velocity increases from 0 to 20 m/s in 10 s, what is the average acceleration? Select one: 0.5 m/s^2 2 m/s^2 10 m/s^2 30 m/s^2
2 m/s^2
A girl rolls a basketball across a basketball court. The ball slowly decelerates at a rate of −0.20 m/s2. If the initial velocity was 2.0 m/s and the ball rolled to a stop at 5.0 sec after 12:00 p.m., at what time did she start the ball rolling? Select one: 0.1 seconds before noon 0.1 seconds after noon 5 seconds before noon 5 seconds after noon
5 seconds before noon
A swan on a lake gets airborne by flapping its wings and running on top of the water. If the swan must reach a velocity of 6.00 m/s to take off and it accelerates from rest at an average rate of 0.350 m/s2, how far will it travel before becoming airborne? Select one: −8.60 m 8.60 m −51.4 m 51.4 m
51.4 m
According to Figure 2-1A, during which interval is the object accelerating at the greatest rate? Select one: A to B B to C C to D E to F
A to B
If a plot of displacement versus time is linear, what can be said about the acceleration? Select one: Acceleration is 0. Acceleration is a non-zero constant. Acceleration is positive. Acceleration is negative.
Acceleration is 0.
How can you use the definition of acceleration to explain the units in which acceleration is measured? Select one: Acceleration is the rate of change of velocity. Therefore, its unit is m/s2. Acceleration is the rate of change of displacement. Therefore, its unit is m/s. Acceleration is the rate of change of velocity. Therefore, its unit is m2/s. Acceleration is the rate of change of displacement. Therefore, its unit is m2/s.
Acceleration is the rate of change of velocity. Therefore, its unit is m/s2.
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down. Select one: Its velocity points upward and its acceleration points downward. Both its velocity and its acceleration point downward. Both its velocity and its acceleration point upward. Its velocity points downward and its acceleration points upward.
Both its velocity and its acceleration point downward.
The graph below represents the speed-time relationship for a 2.0-kilogram mass moving along a horizontal frictionless surface: Figure 2-1A According to Figure 2-1A, during which time interval is the acceleration of the object zero? Select one: A to B C to D D to E E to F
D to E
When is a plot of velocity versus time a straight line and when is it a curved line? Select one: It is a straight line when acceleration is changing and is a curved line when acceleration is constant. It is a straight line when acceleration is constant and is a curved line when acceleration is changing. It is a straight line when velocity is constant and is a curved line when velocity is changing. It is a straight line when velocity is changing and is a curved line when velocity is constant.
It is a straight line when acceleration is constant and is a curved line when acceleration is changing.
Suppose you throw a ball downward in the absence of air resistance. Make a statement about the ball's acceleration after it has left your hand. Select one: Its acceleration is constantly increasing. Its acceleration is zero. Its acceleration is constantly decreasing. Its acceleration is constant.
Its acceleration is constant.
When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion? Select one: Its acceleration is constant. Both its acceleration and its velocity are constant. Neither its acceleration nor its velocity is constant. Its velocity is constant.
Its acceleration is constant.
Suppose a ball is thrown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest point. Select one: Its velocity is not zero and its acceleration is zero. Its velocity is zero and its acceleration is not zero. Neither its velocity nor its acceleration is zero. Both its velocity and its acceleration are zero.
Its velocity is zero and its acceleration is not zero.
Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up. Select one: Its velocity points downward and its acceleration points upward. Both its velocity and its acceleration point upward. Its velocity points upward and its acceleration points downward. Both its velocity and its acceleration points downward.
Its velocity points upward and its acceleration points downward.
Which of the following statements explains why a racecar going around a curve is accelerating, even if the speed is constant? Select one: The car is accelerating because the magnitude as well as the direction of velocity is changing. The car is accelerating because the magnitude of velocity is changing. The car is accelerating because the direction of velocity is changing. The car is accelerating because neither the magnitude nor the direction of velocity is changing.
The car is accelerating because the direction of velocity is changing.
When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion? Select one: The car speeds up. The car remains at rest. The car slows down. The car travels at constant speed.
The car slows down.
A student calculated the final velocity of a train that decelerated from 30.5 m/s and got an answer of −43.34 m/s. Which of the following might indicate that he made a mistake in his calculation? Select one: The sign of the final velocity is wrong. The magnitude of the answer is too small. There are too few significant digits in the answer. The units in the initial velocity are incorrect.
The sign of the final velocity is wrong.
How is the vector arrow representing an acceleration of magnitude 3 m/s2different from the vector arrow representing a negative acceleration of magnitude 3 m/s2? Select one: They point in the same direction. They are perpendicular, forming a 90° angle between each other. They point in opposite directions. They are perpendicular, forming a 270° angle between each other.
They point in opposite directions.
For the motion of a falling object, which graphs are straight lines? Select one: Acceleration versus time only Displacement versus time only Displacement versus time and acceleration versus time Velocity versus time and acceleration versus time
Velocity versus time and acceleration versus time
If a car decelerates from 20 m/s to 15 m/s in 5 s, what is the change in velocity, Δ𝑣Δv? Select one: a. -5 m/s b. -1 m/s c. 1 m/s d. 5 m/s
a. -5 m/s
The SI base unit for time is Select one: a. 1 second. b. 1 day. c. 1 minute. d. 1 hour.
a. 1 second
Suppose that a bathroom scale reads a person's mass as 65 kg with a 3 percent uncertainty. What is the uncertainty in their mass in kilograms? Select one: a. 2 kg b. 98 kg c. 5 kg d. 0
a. 2 kg
A body with mass m is pushed along a horizontal surface by a force F and is opposed by a frictional force f. How would you draw a free-body diagram to represent this situation? a. A dot with an arrow pointing right, labeled F, and an arrow pointing left, labeled f, that is of equal length or shorter than F b. A dot with an arrow pointing right, labeled F, and an arrow pointing right, labeled f, that is of equal length or shorter than F c. A dot with an arrow pointing right, labeled F, and a smaller arrow pointing up, labeled f, that is of equal length or longer than F d. A dot with an arrow pointing right, labeled F, and a smaller arrow pointing down, labeled f, that is of equal length or longer than F
a. A dot with an arrow pointing right, labeled F, and an arrow pointing left, labeled f, that is of equal length or shorter than F.
Which of the following is used to represent an object in a free-body diagram? a. A point b. A line c. A vector d. A unit
a. A point
From the equation for Newton's second law, we see that F_net is directly proportional to a and that the constant of proportionality is m. What does this mean in a practical sense? a. An increase in applied force will cause an increase in acceleration if the mass is constant. b. An increase in applied force will cause a decrease in acceleration if the mass is constant. c. An increase in applied force will cause an increase in acceleration, even if the mass varies. d. An increase in applied force will cause an increase in acceleration and mass.
a. An increase in applied force will cause an increase in acceleration if the mass is constant.
Describe the main difference between the metric system and the U.S. Customary System. a. In the metric system, unit changes are based on powers of 10, while in the U.S. customary system, each unit conversion has unrelated conversion factors. b.In the metric system, each unit conversion has unrelated conversion factors, while in the U.S. customary system, unit changes are based on powers of 10. c. In the metric system, unit changes are based on powers of 2, while in the U.S. customary system, each unit conversion has unrelated conversion factors. d. In the metric system, each unit conversion has unrelated conversion factors, while in the U.S. customary system, unit changes are based on powers of 2.
a. In the metric system, unit changes are based on powers of 10, while in the U.S. customary system, each unit conversion has unrelated conversion factors.
Skydivers are affected by acceleration due to gravity and by air resistance. Eventually, they reach a speed where the force of gravity is almost equal to the force of air resistance. As they approach that point, their acceleration decreases in magnitude to near zero. Part A. Describe the shape of the graph of the magnitude of the acceleration versus time for a falling skydiver. Part B. Describe the shape of the graph of the magnitude of the velocity versus time for a falling skydiver. Part C. Describe the shape of the graph of the magnitude of the displacement versus time for a falling skydiver. Select one: a. Part A. Begins with a nonzero y-intercept with a downward slope that levels off at zero; Part B. Begins at zero with an upward slope that decreases in magnitude until the curve levels off; Part C. Begins at zero with an upward slope that increases in magnitude until it becomes a positive constant b. Part A. Begins with a nonzero y-intercept with an upward slope that levels off at zero; Part B. Begins at zero with an upward slope that decreases in magnitude until the curve levels off; Part C. Begins at zero with an upward slope that increases in magnitude until it becomes a positive constant c. Part A. Begins with a nonzero y-intercept with a downward slope that levels off at zero; Part B. Begins at zero with a downward slope that decreases in magnitude until the curve levels off; Part C. Begins at zero with an upward slope that increases in magnitude until it becomes a positive constant d. Part A. Begins with a nonzero y-intercept with an upward slope that levels off at zero; Part B. Begins at zero with a downward slope that decreases in magnitude until the curve levels off; Part C. Begins at zero with an upward slope that increases in magnitude until it becomes a positive constant
a. Part A. Begins with a nonzero y-intercept with a downward slope that levels off at zero; Part B. Begins at zero with an upward slope that decreases in magnitude until the curve levels off; Part C. Begins at zero with an upward slope that increases in magnitude until it becomes a positive constant
A 2,000-kg car is sitting at rest in a parking lot. A bike and rider with a total mass of 60 kg are traveling along a road at 10 km/h. Which system has more inertia? Why? a. The car has more inertia, as its mass is greater than the mass of the bike. b. The bike has more inertia, as its mass is greater than the mass of the car. c. The car has more inertia, as its mass is less than the mass of the bike. d. The bike has more inertia, as its mass is less than the mass of the car.
a. The car has more inertia, as its mass is greater than the mass of the bike.
A test car carrying a crash test dummy accelerates from 0 to 30 m/s and then crashes into a brick wall. Describe the direction of the initial acceleration vector and compare the initial acceleration vector's magnitude with respect to the acceleration magnitude at the moment of the crash. Select one: a. The direction of the initial acceleration vector will point towards the wall, and its magnitude will be less than the acceleration vector of the crash. b. The direction of the initial acceleration vector will point away from the wall, and its magnitude will be less than the vector of the crash. c. The direction of the initial acceleration vector will point towards the wall, and its magnitude will be more than the acceleration vector of the crash. d. The direction of the initial acceleration vector will point away from the wall, and its magnitude will be more than the acceleration vector of the crash.
a. The direction of the initial acceleration vector will point towards the wall, and its magnitude will be less than the acceleration vector of the crash.
A 55-kg lady stands on a bathroom scale inside an elevator. The scale reads 70 kg. What do you know about the motion of the elevator? a. The elevator must be accelerating upward. b. The elevator must be accelerating downward. c. The elevator must be moving upward with a constant velocity. d. The elevator must be moving downward with a constant velocity.
a. The elevator must be accelerating upward.
An object is at rest. Two forces, X and Y, are acting on it. Force X has a magnitude of x and acts in the downward direction. What is the magnitude and direction of Y? a. The magnitude is x and points in the upward direction. b. The magnitude is 2x and points in the upward direction. c. The magnitude is x and points in the downward direction. d. The magnitude is 2x and points in the downward direction.
a. The magnitude is x and points in the upward direction.
Two objects rest on a uniform surface. A person pushes both with equal force. If the first object starts to move faster than the second, what can be said about their masses? a. The mass of the first object is less than that of the second object. b. The mass of the first object is equal to the mass of the second object. c. The mass of the first object is greater than that of the second object. d. No inference can be made because mass and force are not related to each other.
a. The mass of the first object is less than that of the second object.
Two forces acting on an object are perpendicular to one another. How would you draw these in a free-body diagram? a. The two force arrows will be drawn at a right angle to one another. b. The two force arrows will be pointing in opposite directions. c. The two force arrows will be at a 45° angle to one another. d. The two force arrows will be at a 180° angle to one another.
a. The two force arrows will be drawn at a right angle to one another.
Velocity, or speed, is measured using the following formula: v = d/t , where v is velocity, d is the distance travelled, and t is the time the object took to travel the distance. If the velocity-time data are plotted on a graph, which variable will be on which axis? Why? a. Time would be on the x-axis and velocity on the y-axis, because time is an independent variable and velocity is a dependent variable. b. Velocity would be on the x-axis and time on the y-axis, because time is the independent variable and velocity is the dependent variable. c. Time would be on the x-axis and velocity on the y-axis, because time is a dependent variable and velocity is a independent variable. d. Velocity would be on x-axis and time on the y-axis, because time is a dependent variable and velocity is a independent variable.
a. Time would be on the x-axis and velocity on the y-axis, because time is an independent variable and velocity is a dependent variable.
A ball is dropped and hits the floor. What is the direction of the force exerted by the floor on the ball? a. Upward b. Downward c. Right d. Left
a. Upward
What kind of force is friction? a. External force b. Internal force c. Net force d. Nuclear force
a. external force
The SI base unit used to measure mass is the a. kilogram. b. meter. c. liter. d. second.
a. kilogram.
What term best describes the relationship shown in Graph 1.1? Select one: a. positive linear b. direct c. negative linear d. proportional
a. positive linear
Only two forces are acting on an object: force A to the left and force B to the right. If force B is greater than force A, in which direction will the object move? a. To the right b. To the left c. Upward d. The object does not move
a. to the right
The number of significant figures in 0.040 is a. two. b. four. c. one. d. three.
a. two.
What do we call the rate at which velocity changes? Select one: vectors. motion. speed. acceleration.
acceleration.
The speed of sound is measured at 342 m/s on a certain day. What is this in km/h? Report your answer in scientific notation. Select one: a. 1.23 x 10^4 km/h b. 1.23 x 10^3 km/h c. 9.5 x 10^1 km/h d. 2.05 x 10^1 km/h
b. 1.23 x 10^3 km/h
For the voltmeter in the image below, what is the reading given by needle A expressed to the best precision of the instrument? a. 103mV b. 107mV c. 110mV d. 100.17mV
b. 107mV
The speed limit on some interstate highways is roughly 80 km/h. What is this in meters per second? How many miles per hour is this? Select one: a. 62 m/s, 27.8 mph b. 22.2 m/s, 49.7 mph c. 62 m/s, 2.78 mph d. 2.78 m/s, 62 mph
b. 22.2 m/s, 49.7 mph
What would be the slope for a line passing through the two points below? Point 1: (1, 0.1) Point 2: (7, 26.8) Select one: a. 2.4 b. 4.5 c. 6.2 d. 6.8
b. 4.5
By convention, which sign is assigned to an object moving downward? a. A positive sign ( + ) b. A negative sign ( - ) c. Either a positive or negative sign ( \pm ) d. No sign is assigned
b. A negative sign ( - )
A helicopter pushes air down, which, in turn, pushes the helicopter up. Which force affects the helicopter's motion? Why? a. Air pushing upward affects the helicopter's motion because it is an internal force that acts on the helicopter. b. Air pushing upward affects the helicopter's motion because it is an external force that acts on the helicopter. c. The downward force applied by the blades of the helicopter affects its motion because it is an internal force that acts on the helicopter. d. The downward force applied by the blades of the helicopter affects its motion because it is an external force that acts on the helicopter.
b. Air pushing upward affects the helicopter's motion because it is an external force that acts on the helicopter.
Describe all of the characteristics that can be determined about a straight line with a slope of {-3} and a y-intercept of 50 on a graph. a. Based on the information, the line has a negative slope. Because its y-intercept is 50 and its slope is negative, this line gradually rises on the graph as the x-value increases. b. Based on the information, the line has a negative slope. Because its y-intercept is 50 and its slope is negative, this line gradually moves downward on the graph as the x-value increases. c. Based on the information, the line has a positive slope. Because its y-intercept is 50 and its slope is positive, this line gradually rises on the graph as the x-value increases. d. Based on the information, the line has a positive slope. Because its y-intercept is 50 and its slope is positive, this line gradually moves downward on the graph as the x-value increases.
b. Based on the information, the line has a negative slope. Because its y-intercept is 50 and its slope is negative, this line gradually moves downward on the graph as the x-value increases.
What is dynamics? a. Dynamics is the study of internal forces. b. Dynamics is the study of forces and their effect on motion. c. Dynamics describes the motion of points, bodies, and systems without consideration of the cause of motion. d. Dynamics describes the effect of forces on each other.
b. Dynamics is the study of forces and their effect on motion.
A large truck with mass 30 m crashes into a small sedan with mass m. If the truck exerts a force F on the sedan, what force will the sedan exert on the truck? a. F/ 30 b. F c. 2F d. 30F
b. F
A student is asked to solve a problem: An object falls from a height for 2.0 s, at which point it is still 60 m above the ground. What will be the velocity of the object when it hits the ground? Which of the following provides the correct order of kinematic equations that can be used to solve the problem? Select one: a. First use 𝑣2=𝑣20+2𝑎𝑑 , then use 𝑣=𝑣0+𝑎𝑡 b. First use 𝑣=𝑣0+𝑎𝑡, then use 𝑣2=𝑣20+2𝑎𝑑 c. First use 𝑑=𝑣0𝑡+12𝑎𝑡2 , then use 𝑣=𝑣0+𝑎𝑡 d. First use 𝑣=𝑣0+𝑎𝑡, then use 𝑑=𝑣0𝑡+12𝑎𝑡2 .
b. First use 𝑣=𝑣0+𝑎𝑡, then use 𝑣2=𝑣20+2𝑎𝑑
What is another name for Newton's first law? a. Law of infinite motion b. Law of inertia c. Law of friction d. Law of gravitation
b. Law of inertia
A ball rolls along the ground, moving from north to south. What direction is the frictional force that acts on the ball? a. North to south b. South to north c. West to east d. East to west
b. South to north
A fish pushes water backward with its fins. How does this propel the fish forward? a. The water exerts an internal force on the fish in the opposite direction, pushing the fish forward. b. The water exerts an external force on the fish in the opposite direction, pushing the fish forward. c. The water exerts an internal force on the fish in the same direction, pushing the fish forward. d. The water exerts an external force on the fish in the same direction, pushing the fish forward.
b. The water exerts an external force on the fish in the opposite direction, pushing the fish forward.
In a free-body diagram, the arrows representing tension and weight have the same length but point away from one another. What does this indicate? a. They are equal in magnitude and act in the same direction. b. They are equal in magnitude and act in opposite directions. c. They are unequal in magnitude and act in the same direction. d. They are unequal in magnitude and act in opposite directions.
b. They are equal in magnitude and act in opposite directions.
A ball travels from north to south at 60 km/h. After being hit by a bat, it travels from west to east at 60 km/h. Is there a change in velocity? a. Yes, because velocity is a scalar. b. Yes, because velocity is a vector. c. No, because velocity is a scalar. d. No, because velocity is a vector
b. Yes, because velocity is a vector.
Which forces cause changes in the motion of a system? a. internal forces b. external forces c. both internal and external forces d. neither internal nor external forces
b. external forces
In the equation for Newton's second law, what does ΣF stand for? a. Internal force b. Net external force c. Frictional force d. Imaginary force
b. net external force
At x = 3, a function f(x) has a positive value, with a positive slope that is decreasing in magnitude with decreasing x. Which option could correspond to f(x)? Select one: a. y=13x b. y=x^2 c. =2x+9 d. y=(x/2)+9
b. y=x^2
How do you express, mathematically, that no external force is acting on a body? a. ΣF = −1 b. ΣF = 0 c. ΣF = 1 d. ΣF = ∞
b. ΣF = 0
Which of the following would describe a length that is 2.0 x 10-3 of a meter? Select one: a. 2.0 kilometers b. 2.0 megameters c. 2.0 millimeters d. 2.0 micrometers
c. 2.0 millimeters
Which of the following is equal to 58.3cm? Select one: a. 583dm b. 0.583mm c. 5.83x10-4 km d. 5.83m
c. 5.83x10-4 km
Two similar boxes rest on a table. One is empty and the other is filled with pebbles. Without opening or lifting either, how can you tell which box is full? Why? a. By applying an internal force; whichever box accelerates faster is lighter and so must be empty b. By applying an internal force; whichever box accelerates faster is heavier and so the other box must be empty c. By applying an external force; whichever box accelerates faster is lighter and so must be empty d. By applying an external force; whichever box accelerates faster is heavier and so the other box must be empty
c. By applying an external force; whichever box accelerates faster is lighter and so must be empty
A steadily rolling ball is pushed in the direction from east to west, which causes the ball to move faster in the same direction. What is the direction of the acceleration? a. North to south b. South to north c. East to west d. West to east
c. East to West
One object exerts a force of magnitude F1 on another object and experiences a force of magnitude F2 in return. What is true for F1 and F2? a. F1 > F2 b. F1 < F2 c. F1 = F2 d. impossible to determine without more information
c. F1 = F2
Which of the following is a physical quantity that can be described by dynamics but not by kinematics? a. Velocity b. Acceleration c. Force d. Mass
c. Force
What is the SI unit of force? a. kg b. dyn c. N d. lb
c. N
How does the independent variable in a graph differ from the dependent variable? Select one: a. The dependent variable varies linearly with the independent variable. b. The dependent variable depends on the scale of the axis chosen while independent variable does not. c. The independent variable is directly manipulated or controlled by the person doing the experiment, while dependent variable is the one that changes as a result. d. The dependent and independent variables are fixed by a convention and hence they are the same.
c. The independent variable is directly manipulated or controlled by the person doing the experiment, while dependent variable is the one that changes as a result.
What is the net external force on an object in freefall on Earth if you were to neglect the effect of air? a. The net force is zero. b. The net force is upward with magnitude mg. c. The net force is downward with magnitude mg. d. The net force is downward with magnitude 9.8 N.
c. The net force is downward with magnitude mg.
A body is pushed eastward by a force of four units and southward by a force of three units. How would you draw a free-body diagram to represent this? a. Two force vectors acting at a point, one pointing left with a length of 4 units and the other pointing down with a length of 3 units b. Two force vectors acting at a point, one pointing left with a length of 4 units and the other pointing up with a length of 3 units c. Two force vectors acting at a point, one pointing right with a length of 4 units and the other pointing down with a length of 3 units d. Two force vectors acting at a point, one pointing right with a length of 4 units and the other pointing up with a length of 3 units
c. Two force vectors acting at a point, one pointing right with a length of 4 units and the other pointing down with a length of 3 units
What does it mean for two quantities to be inversely proportional to each other? a. When one variable increases, the other variable decreases by a greater amount. b. When one variable increases, the other variable also increases. c. When one variable increases, the other variable decreases by the same factor. d. When one variable increases, the other variable also increases by the same factor.
c. When one variable increases, the other variable decreases by the same factor.
The number of significant figures in 0.01500 is Select one: a. five b. three c. four d. two
c. four
Which formula is equivalent to 𝐷=𝑚/𝑉 ? Select one: a. 𝑉=𝑚𝐷/𝑉 b. 𝑉=𝐷/𝑚 c. 𝑉=𝑚/𝐷 d. 𝑉=𝐷𝑚
c. 𝑉=𝑚/𝐷
Which variable represents displacement? Select one: a d t v
d
Which of the following has three significant figures? a. 1.00081 kg b. 8.060 x 1011 m2 c. 305.0 cm d. 0.0500 mm
d. 0.0500 mm
A person pushes an object of mass 5.0 kg along the floor by applying a force. If the object experiences a friction force of 10 N and accelerates at 18 m/s^2, what is the magnitude of the force exerted by the person? a. −90 N b. -80 N c. 90 N d. 100 N
d. 100 N
The graph shows the temperature change over time of a heated cup of water. See the graph below. What is the slope of the graph between the time period 2 min and 5 min? Select one: a. -15 ºC/min b. -0.07 ºC/min c. 0.07 ºC/min d. 15 ºC/min
d. 15 ºC/min
The measurement 64.010cm has how many significant digits? Select one: a. 2 b. 3 c. 4 d. 5
d. 5
The tires you choose to drive over icy roads will create more friction with the road than your summer tires. Give another example where more friction is desirable. a. Children's slide b. Air hockey table c. Ice-skating rink d. Jogging track
d. Jogging track
How do rockets propel themselves in space? a. Rockets expel gas in the forward direction at high velocity, and the gas, which provides an internal force, pushes the rockets forward. b. Rockets expel gas in the forward direction at high velocity, and the gas, which provides an external force, pushes the rockets forward. c. Rockets expel gas in the backward direction at high velocity, and the gas, which is an internal force, pushes the rockets forward. d. Rockets expel gas in the backward direction at high velocity, and the gas, which provides an external force, pushes the rockets forward.
d. Rockets expel gas in the backward direction at high velocity, and the gas, which provides an external force, pushes the rockets forward.
A body is pushed downward by a force of 5 units and upward by a force of 2 units. How would you draw a free-body diagram to represent this? a. Two force vectors acting at a point, both pointing up with lengths of 5 units and 2 units b. Two force vectors acting at a point, both pointing down with lengths of 5 units and 2 units c. Two force vectors acting at a point, one pointing up with a length of 5 units and the other pointing down with a length of 2 units d. Two force vectors acting at a point, one pointing down with a length of 5 units and the other pointing up with a length of 2 units
d. Two force vectors acting at a point, one pointing down with a length of 5 units and the other pointing up with a length of 2 units
What could the acceleration of an object represent? Select one: a. slowing down. b. gaining speed. c. changing direction. d. all of the above
d. all of the above
Moustapha Jones has a problem to do involving time, distance and velocity, but he has forgotten the formula. The question asks him for a measurement in seconds, and the numbers that are given have units of m/s and km. What could Moustapha do to get the answer in seconds? a. multiply the km by the m/s then divide by 1000 b. divide the km by the m/s then divide by 1000 c. multiply the km by the m/s then multiply by 1000 d. divide the km by the m/s then multiply by 1000
d. divide the km by the m/s then multiply by 1000
What are the units for the slope of the line shown in Graph 1.1? Select one: a. m^2/s^2 b. m^2/s c. m/s d. m/s^2
d. m/s^2
The most appropriate metric unit for measuring the length of an automobile is the a. nanometer. b. micron. c. kilometer. d. meter.
d. meter.
The symbol mm represents a Select one: a. manometer. b. megameter. c. micrometer. d. millimeter.
d. millimeter.
Suppose a ball is thrown straight up. What is its acceleration just before it reaches its highest point? Select one: exactly g slightly less than g slightly greater than g zero
exactly g
If an object is accelerated, all of the following may occur EXCEPT: Select one: a change of direction and speed. a change of speed. it remains motionless. a change of direction.
it remains motionless.
What are the SI units of acceleration? Select one: m^2/s cm^2/s m/s^2 cm/s^2
m/s^2
The graph above describes the motion of a cyclist. During the interval shown, the cyclist is Select one: speeding up. traveling at the same speed. slowing down. at rest.
speeding up.
When you throw a ball up in the air, it travels up and then stops instantaneously before falling back down. At the point where it stops and changes direction to fall back down, which quantity is zero? Select one: velocity is zero. acceleration is zero. mass is zero. force is zero.
velocity is zero.
Which kinematic equation would you use to find the velocity of a skydiver 2.0s after she jumps from a plane and before she opens her parachute? Assume the positive direction is downward. Select one: 𝑣=𝑣0+𝑎𝑡 𝑣=𝑣0−𝑎𝑡 𝑣2=𝑣20+2𝑎 𝑣2=𝑣 -at
𝑣=𝑣0+𝑎𝑡
