20 Questions
| Total Attempts: 270

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Questions and Answers

- 1.A car goes from 30 miles per hour (mph) to 60 mph in six seconds. The acceleration of the car is:
- A.
5 mph per second.

- B.
6 mph per second.

- C.
30 mph per second.

- D.
180 mph per second.

- 2.The graph below represents the speed of a car vs. time. Figure 4-1 Which point on the speed versus time graph in Figure 4-1 has the highest acceleration?
- A.
A

- B.
B

- C.
C

- D.
D

- 3.A rocket has an acceleration of 50 m/sec2. How long does it take the rocket to reach a speed of 1,000 m/sec?
- A.
.05 seconds

- B.
20 seconds

- C.
50 seconds

- D.
50,000 seconds

- 4.A sports car reaches a speed of 50 m/sec in 12 seconds after starting from rest. The acceleration of the car is:
- A.
0.24 m/sec^2

- B.
4.17 m/sec^2

- C.
38 m/sec^2

- D.
50 m/sec^2

- 5.The graph below represents the motion of an object. Figure 4-2 Between two and three seconds, the speed of the object shown in Figure 4-2:
- A.
Is approximately 1.33 m/sec

- B.
Is approximately 3 m/sec

- C.
Increases from 1 m/sec to 4 m/sec

- D.
Increases from rest to 4 m/sec

- 6.Which of the following statements CANNOT ever be true?
- A.
An object can have a speed of zero and an acceleration that is not zero.

- B.
An object can have an acceleration of zero and a speed that is not zero.

- C.
An object can have a speed that is changing and still have zero acceleration.

- D.
An object can have a speed that is decreasing and still have acceleration.\x00

- 7.In the equation , the variable x0 represents:
- A.
The position at time t = 0.

- B.
The distance moved in the first second of motion.

- C.
The speed at time t = 0.

- D.
The position when the speed (v) equals zero.

- 8.The graph below represents the motion of a moving object. Figure 4-3 The initial speed (v0) shown in Figure 4-3 is:
- A.
0.0 m/sec.

- B.
0.2 m/sec.

- C.
0.4 m/sec.

- D.
2.0 m/sec.

- 9.A car is traveling at 30 m/sec in a straight line. The driver applies the brakes for 3 seconds, and the car slows down to 12 m/sec. The acceleration of the car is:
- A.
-3 m/sec^2

- B.
-4 m/sec^2

- C.
-6 m/sec^2

- D.
-10 m/sec^2

- 10.If the speed is constant, which variable is zero in the equation ?
- A.
X0

- B.
V0

- C.
A

- D.
T

- 11.An object falls for 2 seconds after being dropped from rest. Its speed is approximately:
- A.
2 m/sec

- B.
4.9 m/sec

- C.
9.8 m/sec

- D.
19.6 m/sec

- 12.A object is thrown straight upwards with a speed of 19.6 m/sec. Three seconds later, its speed is:
- A.
Zero

- B.
9.8 m/sec downward

- C.
49 m/sec upward

- D.
29.4 m/sec downward

- 13.The acceleration of gravity on the moon is about 1.6 m/sec2. A 2-kilogram object on the moon is dropped from rest. After ten seconds, the speed of the object is:
- A.
1.6 m/sec

- B.
3.2 m/sec

- C.
16 m/sec

- D.
32 m/sec

- 14.In physics, the term free fall means:
- A.
No forces act on the object except gravity.

- B.
The speed of a falling object remains constant.

- C.
The object is dropped from an initial speed of zero.

- D.
The object is dropped straight down.

- 15.The acceleration of gravity on the moon is about 1.6 m/sec2. An experiment to test gravity compares the time it takes objects to reach a speed of 10 m/sec after being dropped from rest. How long does an object dropped on the moon have to fall compared to an object dropped on Earth?
- A.
1.6 times as long

- B.
6.1 times as long

- C.
9.8 times as long

- D.
15.7 times as long

- 16.The acceleration of gravity expressed in English units is: a. 9.8 ft/min2. b. 32.2 ft/sec2. c. 9.8 ft/sec2. d. 3.0 ft/sec2.
- A.
9.8 ft/min^2

- B.
32.2 ft/sec^2

- C.
9.8 ft/sec^2

- D.
3.0 ft/sec^2

- 17.A clever person who knows physics measures the depth of a deep hole by dropping a rock into the hole. The rock takes 3.2 seconds to hit the bottom. The depth of the hole is approximately:
- A.
16 meters

- B.
31 meters

- C.
50 meters

- D.
100 meters

- 18.An arrow is shot straight up into the air at a speed of 98 m/sec. What is the maximum height reached by the arrow? You may neglect air friction.
- A.
98 meters

- B.
490 meters

- C.
980 meters

- D.
1,470 meters

- 19.A stone is dropped from the roof of a tall building. A person measures the speed of the stone to be 49 m/sec when it hits the ground. The height of the building is closest to:
- A.
24 meters

- B.
49 meters

- C.
122 meters

- D.
245 meters

- 20.