This exam consists of 25 questions; 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 116. When the exam was given, the mean was 87.0; the median was 89. Click here to see the formula sheet that came with the exam.

A disk of radius R is initially rotating with an angular velocity of 26 rad/s. At t = 0, brakes are applied resulting in a constant angular deceleration of magnitude 3.0 rad/s^{2}.

How many revolutions does the disk make before coming to a stop?

(a) 8 (b) 12 (c) 18 (d) 22 (e) 29

(a) Point A. (b) Point B. (c) They both have the same angular acceleration.

(a) Point A. (b) Point B. (c) They both have the same centripetal acceleration.

A dragster starts from rest and accelerates down the track. Each tire has a radius of 0.35 m and rolls without slipping. After traveling a distance of 400 m, the angular speed of the wheels is 300 rad/s.

What is the linear speed of the dragster?

(a) 70 m/s (b) 95 m/s (c) 105 m/s (d) 120 m/s (e) 135 m/s

(a) 15 rad/s^{2} (b) 21 rad/s^{2} (c) 27 rad/s^{2} (d) 31 rad/s^{2} (e) 39 rad/s^{2}

A uniform board of length L and weight W is supported in two places: one on the extreme left end and the other 2L/3 from the left end.

What is the force exerted by the right support on the board?

(a) 3W/4 (b) W/2 (c) 2W/3 (d) W (e) 3W/2

(a) W/4 (b) W/2 (c) W (d) 2W (e) 4W

(a) (b) (c)

(a) 28 J (b) 57 J (c) zero

(a) 1.4 m/s (b) 2.8 m/s (c) 0.7 m/s (d) 3.0 m/s (e) zero

(a) 100 J (b) 5 J (c) 320 J (d) 10 J (e) 245 J

(a) Block A. (b) Block B. (c) Both blocks end up with the same kinetic energy.

An object of mass M = 5 kg is moving horizontally in a straight line at a speed of 6 m/s. A force of 100 N is applied over a short period of time such that the speed of the object increases to 10 m/s.

The work done by the force is

(a) 100 J (b) 15 J (c) 5 J (d) 260 J (e) 160 J

(a) 10 s (b) 0.35 s (c) 0.15 s (d) 0.2 s (e) 5 s

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

An automobile of mass 1200 kg moving at 1.5 m/s collides with a lamp post and comes to rest. The collision takes 0.1 s.

What is the total impulse delivered to the automobile?

(a) 1100 kg-m/s (b) 1200 kg-m/s (c) 1600 kg-m/s (d) 1800 kg-m/s (e) 2400 kg-m/s

(a) 21 m/s^{2} (b) 19 m/s^{2} (c) 17 m/s^{2} (d) 15 m/s^{2} (e) 10 m/s^{2}

(a) the one with the larger mass (b) the one with the smaller mass (c) they both have the same kinetic energy

(a) yes (b) no

One hockey puck of mass 0.2 kg moving at 20 m/s in the +x direction across a frictionless skating rink collides head-on with a second hockey puck of the same mass moving with the same speed in the -x direction.

Suppose the collision is elastic. What is the velocity of the second hockey puck after the collision?

(a) 0 m/s (b) -14.1 m/s (c) +14.1 m/s (d) -20 m/s (e) +20 m/s

(a) in the +x direction. (b) in the -x direction. (c) zero.

(a) 0.8 kg (b) 0.95 kg (c) 1 kg (d) 1.1 kg (e) 8 kg

(a) Mv^{2} (b) 0.25 Mv^{2} (c) 0.5 Mv^{2} (d) 2Mv^{2} (e) 0

(a) –Mv/4 (b) +Mv/3 (c) It depends on whether the collision is elastic or inelastic.