Physics 101 Final Practice Exam

Practice FINAL EXAM
Physics 101

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1) A car is traveling with a constant speed when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s2. If the car comes to a stop in a distance of 30.0 m, what was the car's original speed?
A) 10.2 m/s
B) 14.5 m/s
C) 105 m/s
D) 210 m/s
Answer: B

2) Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air
A) 1.41 times as long.
B) twice as long.
C) three times as long.
D) four times as long.
Answer: B

3) An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the depth of the crater is 120 m, how long does it take for the rock to fall?
A) 3.04 s
B) 12.2 s
C) 29.3 s
D) 32.1 s
Answer: B

4) A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would
A) double as well.
B) decrease by a factor of two.
C) stay the same.
D) quadruple.
Answer: D

5) Figure above represents the position of a particle as it travels along the x-axis. What is the average speed
of the A particle between t = 2 s and t = 4 s?
A) 1.0 m/s
B) 1.3 m/s
C) 0.67 m/s
D) 0.50 m/s
Answer: A


6) Figure above represents the position of a particle as it travels along the x-axis. What is the average velocity of the
particle between t = 2 s and t = 4 s?
A) 2.0 m/s
B) 1.3 m/s
C) 1.7 m/s
D) 0 m/s
Answer: D


7) To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it
to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water?
A) 2.3 s
B) 2.6 s
C) 2.9 s
D) 3.2 s
Answer: C


8) A vector A has components Ax > 0, and Ay > 0, the angle that this vector makes with the positive x-axis must be
in the range
A) 0° to 90°.
B) 90° to 180°.
C) 180° to 270°.
D) 270° to 360°.
Answer: A


9) A car moves from the point (3.0 m) xˆ + (5.0 m) yˆ to the point (8.0 m) xˆ - (7.0 m) yˆ in 2.0 s. What is the
direction of the average velocity of the car?
A) 67° from the x-axis
B) -67° from the x-axis
C) 33° from the x-axis
D) -33° from the x-axis
Answer: B


10) A boy kicks a football with an initial velocity of 28.0 m/s at an angle of 30.00 above the horizontal. What is the
highest elevation reached by the football in its trajectory?
A) 11.2 m
B) 10.0 m
C) 12.7 m
D) 9.40 m
Answer: B


11) A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the
horizontal range of the ball from the base of the table is 20 m. What is the magnitude and direction of the ball's
acceleration right before it touches the ground?
A) 4.9 m/s2 downward
B) 0 m/s2 downward
C) 9.6 m/s2 downward
D) 9.8 m/s2 downward
Answer: D

12) A bullet is fired from ground level with a speed of 150 m/s at an angle 30.00 above the horizontal at a location
where g = 10.0 m/s2. What is the horizontal component of its velocity after 4 seconds?
A) 150 m/s
B) 0 m/s
C) 130 m/s
D) 75.0 m/s
Answer: C

13) A student kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory:
A) both velocity and acceleration of the soccer ball are zero.
B) neither the ball's velocity nor its acceleration is zero.
C) the ball's acceleration is zero but not its velocity.
D) the ball's acceleration points upwards.
Answer: B

14) A 10.0-kg picture is held in place by two wires, one hanging at 35.0° to the left of the vertical and the other at 45.0° to the right of the vertical. What is the tension in the first wire?
A) 70.4 N
B) 50.8 N
C) 98.1 N
D) 69.4 N
Answer: A

15) A 30.0-kg object slides down a slope which is inclined 27.0° to the horizontal. What is the normal force on the object?
A) 171 N
B) 262 N
C) 387 N
D) 398 N
Answer: B


16) Refer to Figure above. Block A has a mass of 3.00 kg, block B has a mass of 5.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A) 0.981 m/s2
B) 1.86 m/s2
C) 2.94 m/s2
D) 4.20 m/s2
Answer: A

17) A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force required to keep the car from sliding?
A) 9000 N
B) 9810 N
C) 300 N
D) 3000 N
Answer: A

18) Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.00 times his true weight?
A) 1740 m
B) 1490 m
C) 2240 m
D) 228 m
Answer: A



19) An object is under the influence of a force as represented by the force vs. position graph in Figure above. What is the work done as the object moves from 0 m to 4 m?
A) 20 J
B) 30 J
C) 0 J
D) 40 J
Answer: A

20) An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and comes back with half its original kinetic energy. If the speed of the object on return is 2.0 m/s, what is the mass of the object?
A) 2.8 kg
B) 3.8 kg
C) 1.0 kg
D) 4.0 kg
Answer: C

A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in Figure. The vertical height at position A above ground level is 200 m. Neglect friction and use g = 10.0 m/s2.
21) Refer to Figure above. What is the total energy of the roller coaster at point A?
A) 16.0 × 103 J
B) 20.2 × 103 J
C) 16.0 × 104 J
D) 17.6 × 104 J
Answer: D

22) Refer to Figure above. What is the total energy of the roller coaster at point B?
A) 16.4 × 103 J
B) 20.2 × 103 J
C) 17.6 × 104 J
D) 16.4 × 104 J
Answer: C

23) A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 8000 kg and ejects gas with a velocity of 2000 m/s. How much gas must be ejected in the first second to give the rocket an acceleration of 30.0 m/s?
A) 120 kg
B) 7.50 kg
C) 15.0 kg
D) 150 kg
Answer: A

24) Earth's radius is 6.38 × 106 m, and it completes one revolution every day. What is the tangential speed of a person standing on the equator?

A) 232 m/s
B) 148 m/s
C) 464 m/s
D) 73.8 m/s
Answer: C


25) Neptune has a radius of 2.48 × 107 m and an escape velocity of 23,300 m/s. What is the mass of Neptune? G =
6.67 × 10-11 N•m2/kg2.
A) 1.01 × 1026 kg
B) 2.02 × 1026 kg
C) 3.03 × 1026 kg
D) 4.04 × 1026 kg
Answer: A


26) A car moving at 10.0 m/s encounters a bump that has a circular cross-section with a radius of 30.0 m. What is
the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump?
A) 200 N
B) 389 N
C) 789 N
D) 589 N
Answer: B



27) A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the
acceleration of the ball?
A) 0 m/s2
B) 10 m/s2
C) 20 m/s2
D) 50 m/s2
Answer: D

28) A 15.0-kg child is sitting on a playground teeter-totter, 1.50 m from the pivot. What force, applied 0.300 m on
the other side of the pivot, is needed to make the child lift off the ground?
A) 75.0 N
B) 736 N
C) 44.1 N
D) 66.2 N
Answer: B

29) A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her
moment of inertia decreases by 1/2. By what factor does her rotational kinetic energy change?
A) 2
B) 4
C) 2
D) It doesn't change.
Answer: A

30) A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude
of the angular acceleration of the fan?
A) 0.74 rad/s2
B) 0.37 rad/s2
C) 11.6 rad/s2
D) 1.16 rad/s2
Answer: A