A rocket accelerates from 50 m/s to 150 m/s in 5 seconds. What is its average acceleration?
Describing Motion
Select the best possible answer.
1. Suppose nosotros choose inches every bit our basic unit of altitude and days equally our bones unit of time. What would the units of velocity and acceleration be in this system?
a. The unit for velocity is in/south2 and for acceleration is in/s.
b. The unit for velocity is in/south and for acceleration is in/sii.
c. The unit for velocity is in/day and for acceleration is in/twenty-four hours2.
d. The unit of measurement for velocity is in/day2 and for acceleration is in/day.
2. What does the speedometer of a car measure?
a. The boilerplate speed of a car.
b. The instantaneous speed of a machine.
c. The average acceleration of a car.
d. The distance traveled past a car.
iii. A machine traveling effectually a circular track moves with a constant speed of 100 km/h. Is this car moving with constant velocity?
a. Yeah: because the speed remains constant as information technology moves.
b. Yes: because the runway's radius of curvature remains constant.
c. No: because the direction of motility of the machine changes continuously.
d. No: because the distance traveled by the motorcar is not abiding.
four. A motorcar traveling around a circular runway moves with a abiding speed of 100 km/h. Is this machine accelerating?
a. Yes: because the direction of the velocity is changing.
b. Yep: because a car always accelerates around a racetrack.
c. No: considering the speed remains constant at 100 km/h.
d. No: because the velocity vector remains in a abiding direction.
5. A ball is tied to a string attached at the other terminate to a rigid support forms a pendulum. If we pull the ball to i side and release it, the ball moves back and forth along an arc determined by the length of the string. Which 1 of the following statements is right?
a. The speed and the velocity of the ball remain abiding throughout its motion.
b. The speed and the velocity keep and changing and are not constant during the motion.
c. The speed remains constant but the velocity changes because of change in management.
d. The velocity remains constant but the speed changes as the movement slows downwardly and speeds up.
6. A dropped ball gains speed at it falls. Can the velocity of the ball exist abiding in this move?
a. The velocity is constant because the direction of motility is constant.
b. The velocity is abiding because speed is constant.
c. The velocity is not constant considering the speed is increasing.
d. We cannot say because we exercise non know the acceleration of the ball.
7. A commuter of a car steps on the brakes, causing the speed of the car to decrease. Does the car accelerate?
a. The auto accelerates due to the alter in its velocity.
b. The car is slowing down, thus it cannot have any acceleration.
c. The velocity remains in the same management and the acceleration is nix.
d. In that location is a change in speed but that is not enough to produce an dispatch for the car.
8. At a given instant of time, 2 cars traveling at unlike speeds, i twice as big every bit the other. Based upon this data which car has the larger dispatch at this instant of time?
a. The car with twice the speed must have twice the acceleration of the other car.
b. The acceleration of both cars is zero at that instant of time.
c. We cannot say because the values for the speeds of the auto are not given.
d. There is not enough information to determine the acceleration of the cars.
9. In the graph shown hither, velocity is plotted as a office of time for an object traveling in a straight line. Is the velocity constant for whatever time interval shown?
a. The velocity is irresolute at all instants of fourth dimension.
b. The velocity is abiding during the instant of t = 0 and t = 2 seconds.
c. The velocity is abiding during the instant of t = 2 to t = 4 seconds.
d. The velocity is constant during the instant of t = four to t = 8 seconds.
10. A car moves along a straight line so that position varies with time as shown in the figure. Does the car ever get backward?
a. The car is going backward in the tertiary segment of its motion.
b. The auto is ever going forrard because the distance is constantly increasing.
c. The machine travels backward during the 2d segment of its motion.
d. The car travels backward during the offset segment of its movement.
11. In the car of the previous question, how does the instantaneous speed at point A compares to signal B?
a. Instantaneous speed at A is greater than instantaneous speed at point B.
b. Instantaneous speed at A is less than instantaneous speed at point B.
c. Instantaneous speed at A is equal to the instantaneous speed at bespeak B.
d. We cannot say because the time of travel for each segment is not given.
12. For the car of the previous problem, is the velocity constant during any time interval shown?
a. Since the distance is changing the velocity in each time interval is not constant.
b. The velocity is abiding during the first time interval just non during the second and third intervals.
c. The velocity remains constant during the first and 2d intervals but not in the third interval.
d. The velocity remains constant in each of the three fourth dimension intervals.
13. A machine moves along a straight section of road so that its velocity varies with time as shown in the graph. Does the car ever get backward?
a. The automobile goes forward in all three-time intervals shown in the figure.
b. The automobile goes forward in the beginning and second fourth dimension interval just backward in the tertiary time interval.
c. The machine goes forward in the first time interval and backward in the second and tertiary time intervals.
d. The car goes backward in the beginning time interval merely forward in the second and third time intervals.
fourteen. For the auto whose velocity is plotted in the previous question, in which time interval the dispatch is naught?
a. The acceleration is zilch in all iii-time intervals.
b. The dispatch is goose egg in the second time but none nix in the offset and tertiary intervals.
c. The acceleration is null in the start interval but none cypher in second and third intervals.
d. The dispatch is not zero in any of the three fourth dimension intervals.
15. A motorcar traveling in the frontwards management experiences a negative acceleration for ten seconds. Is the distance covered in the first 5 seconds equal to, greater than, or less than the distance traveled during the 2d v seconds?
a. The distance traveled during the first 5 seconds is the same as the second 5 seconds.
b. The distance traveled during the kickoff v seconds is greater than the second 5 seconds.
c. The distance traveled during the first v seconds is less than the second 5 seconds.
d. The distance traveled in the second 5 seconds is null because of the zero acceleration.
16. The velocity-versus-time graph of an object curves as shown in the diagram. Is dispatch of the object constant?
a. Yeah; the bend is a smooth curve indicating a constant acceleration.
b. Yes; acceleration is constant because the curve seems to be leveling off.
c. No; for a constant acceleration, the graph has to be a horizontal line.
d. No; for a constant acceleration, the graph has to be a line of constant slope.
17. The ii measurements necessary for calculating average speed are:
a. Acceleration and time.
b. Velocity and time.
c. Distance and time.
d. Distance and acceleration.
18. A traveler covers a distance of 460 miles in viii hours. What is the boilerplate speed of this trip?
a. 460 mph.
b. 57.5 mph.
c. 460 miles/h2.
d. 57.five miles/hii.
xix. A commuter drives for iii.5 hours at an average speed of 58 mph. What distance does she travel in this time?
a. 203 miles.
b. 58 miles.
c. 203 mph.
d. 58 mph.
20. A motorcar travels with an average speed of 25 one thousand/s. What is the speed in km/h?
a. 25000 km/h.
b. 90000 km/h.
c. 90 km/h.
d. threescore km/h.
21. The velocity of a auto decreases from 30 m/due south to 18 one thousand/s in a time of iv seconds. What is the average acceleration of the car in this trip?
a. 3 grand/s.
b. 3 chiliad/due southii.
c. -3 one thousand/s2.
d. 3 1000.
22. A car traveling with an initial speed of 12 m/s accelerates at a constant rate of 2.5 thousand/s2 for 2 seconds. What is the velocity at the end of this fourth dimension?
a. 12 m/south.
b. 17 m/s.
c. 2.five m/s.
d. fourteen.five m/s.
23. What is the distance traveled by the motorcar of the previous question.
a. 24 m.
b. 29 g.
c. 5 k.
d. 17 thousand.
24. A runner moving with an initial velocity of 9 grand/due south slows downward at a abiding charge per unit of 1.v thousand/stwo over a catamenia of 2 seconds. What is the velocity at the end of this time?
a. 6 m/s.
b. nine m/s.
c. seven.v thou/s.
d. ten.5 m/southward.
25. What is the distance traveled by the runner of the previous problem?
a. 18 m.
b. 21 thousand.
c. 15 m.
d. five m.
26. If a auto increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is,
a. 3 km/h/s.
b. 6 km/h/due south.
c. 10 km/h/s.
d. 60 km/h/southward.
27. If a rocket initially at balance accelerates at a charge per unit of 50 m/s2, what is its speed later on 1 minute?
a. 50 m/due south.
b. 500 thou/s.
c. 3000 m/southward.
d. 3600 grand/s.
28. While a motorcar travels around a circular track at abiding speed, which of the post-obit statements is true?
a. Acceleration of the car is null.
b. Velocity of the machine is zero.
c. Both (a) and (b).
d. None of these.
29. A car accelerates from residue at 2 meters per 2d per 2d (i.e. 2 yard/southward2). What is its speed 3 seconds afterward the automobile starts moving?
a. 2 m/s.
b. three m/south.
c. 4 m/s.
d. six m/s.
30. For the car of the previous question, how long will it have for the auto'due south speed to reach 30 m/s?
a. 2 s.
b. 15 s.
c. 30 s.
d. 60 s.
31. What is the dispatch of a motorcar that maintains a constant velocity of 100 km/h for 20 seconds?
a. 0.
b. 100 km/h/southward.
c. 5 km/h/southward.
d. 120 km/h.
Source: https://physics.weber.edu/amiri/physics1010online/WSUonline15W/Griffith/chapter2/Chapter2.htm
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