This exam consists of 26 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 117. When the exam was given, the mean was 96.2 the median was 102. Click here to see the formula sheet that came with the exam.

Peter goes for a walk along the x-axis. The walk takes him 400 seconds to complete. The graph shows his position X as a function of time.

What was the average velocity of the walk?

(a) 0 m/s (b) 1 m/s (c) 2 m/s (d) 3 m/s (e) 4 m/s

(a) 0.5 m/s (b) 1.0 m/s (c) 2.0 m/s (d) 4.0 m/s (e) 5.0 m/s

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

What was the acceleration of the car at t = 35 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

A 2 kg ball is thrown straight up with an initial velocity of 10 m/s. Your y-coordinate axis is pointing up.

When the ball reaches its maximum altitude the y-component of its acceleration is:

(a) 0 (b) -g (c) +g

(a) 1 m (b) 2.4 m (c) 5.1 m (d) 9.8 m (e) 19.6 m

(a) the same altitude. (b) a smaller altitude. (c) a larger altitude.

(a) Ball 1. (b) Ball 2. (c) They both hit the ground at the same time.

A cannon ball is fired at an angle of 30° above horizontal with an initial speed v_{o} = 250 m/s, reaching a maximum height h before hitting the ground.

What is the maximum height h reached by the ball?

(a) h = 447 m (b) h = 796 m (c) h = 981 m (d) h = 2420 m (e) h = 3185 m

(a) 2h (b) 3h (c) 4h

Suppose a box having a mass M sits on the floor of an elevator that is moving upward but is slowing down. Compare the weight of the box (Mg) to the magnitude of the normal force exerted by the elevator floor on the box (F_{N}).

(a) F_{N} < Mg (b) F_{N} = Mg (c) F_{N} > Mg

Three forces act on a ball of mass 2 kg as shown in the figure below. What is the magnitude of the acceleration of the ball? (There is no gravity in this problem.)

(a) 100 m/s^{2} (b) 200 m/s^{2} (c) 300 m/s^{2} (d) 400 m/s^{2} (e) 500 m/s^{2}

A box of mass M slides down a frictionless inclined plane that makes an angle θ with the horizontal.

What is the magnitude of the normal force acting on the box?

(a) M g (b) M g cos(θ) (c) M g sin(θ)

(a) g (b) g cos(θ) (c) g sin(θ)

Which one of the following best describes the tension in the string?

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

(a) θ = 5° west of north (b) θ = 10° west of north (c) θ = 20° west of north (d) θ = 30° west of north (e) θ = 45° west of north

(a) The car has a constant speed. (b) The car’s speed is increasing. (c) The car’s speed is decreasing.

A block of mass M = 4.0 kg is free to move on a horizontal frictionless surface, and is pulled with a rope that makes an angle of 30° with the horizontal as shown in the drawing below. The tension in the rope is 25 N. What is the acceleration of the block?

(a) 4.41 m/s^{2} (b) 7.81 m/s^{2} (c) 2.24 m/s^{2} (d) 3.54 m/s^{2} (e) 5.41 m/s^{2}

(a) F_{N} = Mg (b) F_{N} < Mg (c) F_{N} > Mg

You apply a horizontal force of 500 N to a 100 kg box on a horizontal floor, and you observe that the box has an acceleration of a = 4 m/s^{2}.

What is the kinetic coefficient of friction μ_{K} between the box and the floor?

(a) μ_{K} = 0.10 (b) μ_{K} = 0.15 (c) μ_{K} = 0.20 (d) μ_{K} = 0.25 (e) μ_{K} = 0.30

(a) a_{new} = 2 m/s^{2} (b) a_{new} > 2 m/s^{2} (c) a_{new} < 2 m/s^{2}

(a) 5.1 m (b) 7.7 m (c) 8.5 m (d) 9.2 m (e) 11.6 m

A physics student ties a 0.5 kg rock to the end of a string and twirls it in a horizontal circle of radius 2 m. If the speed of the rock is 10 m/s, what is the tension T in the string?

(a) T = 25 N (b) T = 50 N (c) T = 75 N (d) T = 100 N (e) T = 200 N

(a) T_{NEW} = 2T (b) T_{NEW} = 4T (c) T_{NEW} = 8T

Suppose the distance of the satellite from the center of the earth is R = 10^{8} m. Assuming that G = 6.7 × 10^{-11} N-m^{2}/kg^{2} and that the mass of the earth is M_{E} = 5.98 × 10^{24} kg, what is the speed of the satellite?

(a) 1200 m/s (b) 1650 m/s (c) 2000 m/s (d) 2200 m/s (e) 2700 m/s

(a) The speed would be the same. (b) The speed would be bigger. (c) The speed would be smaller.