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 110. When the exam was given, the mean was 89.1; the median was 92. Click here to see the formula sheet that came with the exam.

(a) 16.7 s (b) 17.25 s (c) 9.8 s (d) 35.4 s (e) 12.9 s

A football player moves along a straight-line path to catch a ball thrown by the quarterback. The graph shows the speed as a function of time. Calculate the acceleration at 1 s, 2.5 s and 4 s.

(a) (b) (c) (d) (e)

(a) 0 m (b) 2 m (c) 4 m

A ball is thrown upward from the ground at an initial angle of 60° with respect to the horizontal and with an initial speed of 30 m/s. How high does the ball rise above the ground?

(a) 34.4 m (b) 15.4 m (c) 9.8 m (d) 25.0 m (e) 12.5 m

(a) 1.4 s (b) 7.2 s (c) 5.3 s (d) 8.7 s (e) 6.5 s

(a) the same. (b) less. (c) greater.

A boat starts out on one bank of a river and heads directly across the river at a constant velocity of 5 m/s relative to the water. The river flows with a uniform velocity of 3 m/s. The river is 75 m wide. How far downstream from the original position does the boat cover while crossing to the opposite bank of the river

(a) 0 m (b) 75 m (c) 45 m (d) 125 m (e) 20 m

(a) 8 m/s (b) 2 m/s (c) 6 m/s

(a) ball A (b) ball B (c) they have the same speed as they hit the ground

A 1200-kg car (which you may approximate as a point object) rounds a circular curve of radius R = 45 m. If the coefficient of static friction between the tires and the road is µ_{s} = 0.82, what is the maximum speed the car can have in the curve without the tires slipping?

(a) 25.2 m/s (b) 11.8 m/s (c) 15.8 m/s (d) 19.0 m/s (e) 30.6 m/s

(a) V (b) 1.414 V (c) 2 V

A block of mass 4.0 kg is sitting 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 along the surface?

(a) 5.41 m/s^{2} (b) 7.81 m/s^{2} (c) 2.24 m/s^{2} (d) 3.54 m/s^{2} (e) 8.42 m/s^{2}

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

(a) greater than Mg. (b) equal to Mg. (c) less than Mg.

Block A of mass 2 kg and block B of mass 4 kg are attached to each other by a string. The two blocks are sitting on a horizontal frictionless surface. Another string is attached to block B and the whole system is pulled to the right so that both blocks accelerate together, as shown in the figure. If the tension T is 15 N, as shown in the figure, what is the tension T_{1} in the string connecting the two blocks?

(a) 1 N (b) 3 N (c) 5 N (d) 12 N (e) 15 N

(a) greater. (b) less. (c) the same.

A block of mass M = 6 kg slides down an incline at constant velocity. The incline makes an angle of 40° with respect to the horizontal, as shown in the figure. What is the coefficient of kinetic friction between the block and the incline?

(a) 0.92 (b) 0.84 (c) 0.76 (d) 0.65 (e) 0.24

(T) True (F) False

(a) 1.22 (b) 0.69 (c) 0.76 (d) 0.92 (e) 0.38

A horizontal force of 10 N pushes a block against a vertical wall, holding it in place as shown in the figure. The coefficient of static friction between the block and the wall is µ_{s} = 0.59. How many different forces act on the block?

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

(a) 2.4 kg (b) 9.8 kg (c) 3.0 kg (d) 0.6 kg (e) 10 kg

Block A of mass 50 kg rests on a horizontal frictionless tabletop. A horizontal string is attached to A and passes over a massless, frictionless pulley and attaches to block B of mass 30 kg, as shown in the figure. Block A is held in place by hand so that the whole system is at rest. What is the tension in the string?

(a) 108 N (b) 123 N (c) 168 N (d) 147 N (e) 294 N

(a) greater (b) less (c) the same

(a) the one further from the center of the earth (b) the one closer to the center of the earth (c) they both have the same speed