True-false questions are worth 2 points each, three-choice multiple choice questions are worth 3 points each, five-choice multiple choice questions are worth 6 points each. The maximum possible score is 107. The exam period was 90 minutes; the mean score was 74.6; the median score was 76. Click here to see page1 page2 of the formula sheet that came with the exam.

Three blocks are being accelerated upward by a force F applied to the bottom block as shown in the diagram. The mass of the bottom block is 7 kg, the mass of the middle block is 14 kg, and the top block is 21 kg.

Compare the net force on the bottom block F_{1 }with the net force on the top block F_{3}.

(a) F_{1} < F_{3} (b) F_{1} = F_{3} (c) F_{1} > F_{3}

(a) +546 N (b) +206 N (c) +134 N (d) +67.2 N (e) +44.8 N

(a) F = +546 N (b) F = +206 N (c) F = +134 N (d) F = +67.2 N (e) F = +22.4 N

(a) 273 N (b) 206 N (c) 134 N (d) 67.2 N (e) 44.8 N

This velocity vs. time graph represents the motion of a car:

What was the acceleration of the car at t = 15 s ?

(a) -2 m/s^{2} (b) -1 m/s^{2} (c) 0 m/s^{2} (d) 1 m/s^{2} (e) 2 m/s^{2}

(a) 0 m (b) 200 m (c) 250 m (d) 350 m (e) 550 m

Two blocks are connected by a string over an ideal massless pulley suspended from the ceiling as shown in the diagram. At the instant shown, the tension in the string T = 15 N.

Calculate the magnitude of the acceleration of the 2.5 kg block.

(a) a = 3.8 m/s^{2} (b) a = 6.0 m/s^{2} (c) a = 16 m/s^{2}

(a) increases. (b) remains constant. (c) decreases.

(a) F = 15 N (b) F = 30 N (c) F = 35 N

Two identical blocks (M = 1.5 kg) are being pulled across a frictionless surface by ropes. The magnitude of the tension in each of the ropes is the same, (T = 15 N) but, the force on block one is horizontal, and the force on block two is 45° above horizontal.

Compare the magnitude of the net force on block 1, with the magnitude of the net force on block 2.

(a) F_{1} < F_{2} (b) F_{1} = F_{2} (c) F_{1} > F_{2}.

(a) F_{1y} < F_{2y} (b) F_{1y} = F_{2y} (c) F_{1y} > F_{2y}

(a) 2.1 m/s^{2} (b) 4.9 m/s^{2} (c) 9.7 m/s^{2}

A ball is thrown vertically up into the air.

At the moment it reaches its maximum height, the acceleration of the ball is (note positive acceleration is up, negative down).

(a) a < 0 (b) a = 0 (c) a > 0

(a) v < 0 (b) v = 0 (c) v > 0

A 100 kg box is sliding down on an incline with an acceleration of 2 m/s^{2}. The angle α of the incline is 30°.

What is the kinetic friction coefficient between the box and the incline?

(a) 1.74 (b) 0.80 (c) 0.34 (d) 0.30 (e) 0.12

(a) increase. (b) stay the same. (c) decrease.

A ball is fired by a cannon at an angle θ = 30° above horizontal with initial speed V_{o} = 300 m/s.

At what distance S will the ball hit the ground?

(a) S = 9184 m (b) S = 7953 m (c) S = 4592 m (d) S = 15096 m (e) S = 3976 m

(a) h = 4591 m (b) h = 3443 m (c) h = 1148 m

(a) 300 m/s (b) 260 m/s (c) 150 m/s

(a) increase the angle θ (b) decrease the angle θ

A traffic sign hangs by two cables attached to two adjoining buildings as shown in the figure below. Cable A makes an angle of θ = 45° with the wall of the left-hand building. Cable B is horizontal.

What is the mass of the traffic sign if the tension in cable B, T_{B} = 49 N ?

(a) 7.1 kg (b) 5.0 kg (c) 3.5 kg (d) 12.3 kg (e) 1.2 kg

(a) 49 N (b) 69 N (c) 98 N

Moving at a constant speed, a 700 kg car completes one lap in 32 s around a flat circular track with radius 100 m.

What is the acceleration of the car?

(a) 15.42 m/s^{2} (b) 3.86 m/s^{2} (c) zero

(a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4 (e) 0.5

Two wheels A and B are connected by a belt C which does not slip. Wheel A is rotating with a frequency of 300 rpm. The radius of wheel A is R_{A} = 50 cm and the radius of wheel B is R_{B} = 18 cm, as shown in the figure below. (1 rpm = 1 revolution per minute)

What is the angular frequency of the wheel B?

(a) 833.3 rpm (b) 1885 rpm (c) 5236 rpm

(a) 11.2 m/s (b) 13.3 m/s (c) 15.7 m/s (d) 17.1 m/s (e) 19.5 m/s