This exam consists of true-false questions worth 2 points each, traditional multiple-choice questions worth 3 points each, and enhanced multiple-choice questions worth 6 points each. The maximum possible score is 93. When the exam was given, the minimum "A" score was 82; the minimum "B" was 70; the minimum "C" was 55; the minimum "D" was 36. The mean was 65.1; the median was 68. Click here to see the formula sheet that came with the exam.

(a) D (b) 2D (c) D/2

(a) f < Mg (b) f = Mg (c) f > Mg

(a) µ_{k} = 0.17 (b) µ_{k} = 0.22 (c) µ_{k} = 0.29 (d) µ_{k} = 0.34 (e) µ_{k} = 0.41

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

(T) True (F) False

Two identical blocks, A and B, slide down two frictionless ramps that make angles of 30° and 60° respectively with the horizontal. Assuming the blocks start from rest at the same vertical height above the floor, compare the speeds of the blocks, V_{A} and V_{B}, when they reach the floor.

(a) V_{A} < V_{B} (b) V_{A} = V_{B} (c) V_{A} > V_{B}

A force F = 2000 N is used to push a box of mass m = 5 kg mass up a q=30° frictionless ramp that is a length L = 12 m long. Suppose the force acts parallel to the surface of the ramp, and that the box starts from rest at ground level. The force stops pushing just as the box leaves the top of the ramp, after which the box is acted on only by gravity. What is the speed of the box V_{G} when it hits the ground? (Hint: remember that W_{net} = DKE).

(a) V_{G} = 98 m/s (b) V_{G} = 147 m/s (c) V_{G} = 139 m/s (d) V_{G} = 203 m/s (e) V_{G} = 188 m/s

(a) V_{G,NEW} = 2V_{G} (b) V_{G,NEW} = 4V_{G} (c) V_{G,NEW} = 8V_{G}

(a) 1.15 m (b) 1.87 m (c) 2.38 m (d) 2.73 m (e) 3.19 m

(a) DPE = ^{1}/_{2}kd^{2} (b) DPE = mgH (c) DPE = 0

(a) sqrt(10) (b) 10 (c) 100

(a) The student catches and holds on to the Frisbee. (b) The student catches the Frisbee and then throws it back to her friend. (c) The student catches the Frisbee and then drops it.

A bullet having an initial velocity of 300 m/s in the +x direction penetrates an initially stationary pop can of mass 100 gm and emerges in the other side with a final velocity of 200 m/s in the +x direction. The velocity of the pop can after the collision is 5 m/s, also in the +x direction. Assume the pop can slides on a horizontal frictionless surface. What is the mass of the bullet?

(a) 2 gm (b) 5 gm (c) 12 gm (d) 21 gm (e) 25 gm

(a) The momentum of the system in the x direction is conserved but the total mechanical energy of the system is not. (b) The total mechanical energy of the system is conserved but the momentum of the system in the x direction is not. (c) Both the momentum of the system in the x direction and the total mechanical energy of the system are conserved.

(a) KE_{H} < KE_{L} (b) KE_{H} = KE_{L} (c) KE_{H} > KE_{L}

(a) increase (b) decrease (c) not change

(a) 1.2 kg (b) 2.5 kg (c) 3.6 kg (d) 2.0 kg (e) 4.8 kg

(a) Frozen chickens are more likely to break the window. (b) Thawed chickens are more likely to break the window. (c) Frozen and thawed chickens are equally likely to break the window.

(a) T = mg (b) T < mg (c) T > mg

(a) T = 19.8 N (b) T = 12.1 N (c) T = 27.2 N (d) T = 6.17 N (e) T = 4.21 N

(a) 2 rad/s (b) 4 rad/s (c) 6 rad/s (d) 8 rad/s (e) 10 rad/s

(a) v_{max} = 9.81m/s (b) v_{max} = 12.1 m/s (c) v_{max} = 16.8 m/s (d) v_{max} = 21.2 m/s (e) v_{max} = 27.3 m/s