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 102. The exam period was 90 minutes; the mean score was 84.0; the median score was 87. Click here to see page1 page2 of the formula sheet that came with the exam.

A student throws a ball off a cliff. When the ball leaves the student's hand it is traveling with a speed of 23 m/s, and the vertical component of the balls velocity is 18 m/s. The ball hits the ground after 4.2 seconds.

What is angle did the student throw the ball?

(a) θ = 24° (b) θ = 37° (c) θ = 52°

(a) 1.8 s (b) 2.3 s (c) 3.1 s

(a) 9.1 m (b) 10.8 m (c) 13.1 m

(a) 60 m (b) 75 m (c) 97 m

Block A is suspended vertically by an ideal string that passes over an ideal pulley and is then connected to Block B (1.6 kg) that is resting on a ramp with the coefficient of friction μ and with the incline of 35° as shown in the figure. Block A is observed to accelerate down at a rate of 1.8 m/s^{2}. The tension in the string is measured to be 20 N.

Calculate the mass of block A.

(a) 1.5 kg (b) 2.0 kg (c) 2.5 kg (d) 3.0 kg (e) 3.5 kg

(a) 8.1 N (b) 9.1 N (c) 12.1 N (d) 18.1 N (e) 23.1 N

(a) 8.3 N (b) 12.8 N (c) 15.7 N

(a) T > 20 N (b) T = 20 N (c) T < 20 N

(a) 296 N (b) 569 N (c) 764 N (d) 960 N (e) 1230 N

A boat starts out on one bank of a river and heads across the river at a constant velocity of 5 m/s relative to the water and perpendicular to its flow. The river is 75 meters wide and flows with a uniform velocity of 3 m/s.

How far downstream from the original position does the boat travel while crossing to the opposite bank of the river?

(a) 35 m (b) 45 m (c) 55 m

(a) 3.5 m/s (b) 5.0 m/s (c) 5.8 m/s

A box slides in a straight line across a floor with initial velocity 20 m/s. Due to friction, 2 seconds later is has a velocity of 5 m/s.

What is its average acceleration during this time interval?

(a) -2.5 m/s^{2} (b) -5 m/s^{2} (c) -7.5 m/s^{2}

(a) 0.57 (b) 0.67 (c) 0.77

(a) 6 m/s^{2} (b) 3 m/s^{2} (c) 1.5 m/s^{2}

A car starts from rest and, moving with constant acceleration along a straight line, has a speed of 45 m/s after traveling 210 m.

What is the acceleration of the car?

(a) 1.01 m/s^{2} (b) 2.68 m/s^{2} (c) 4.82 m/s^{2}

(a) 5.44 s (b) 6.22 s (c) 7.06 s (d) 8.71 s (e) 11.55 s

A ball with mass M = 5 kg is suspended from the ceiling by a wire with tension T_{1}. A student displaces the mass to the right by pulling, in a horizontal direction, on a second wire with tension T_{2} = 20 N.

What is the tension T_{1}?

(a) 39 N (b) 42 N (c) 48 N (d) 53 N (e) 78 N

(a) 37.6° (b) 42.3° (c) 55.8° (d) 67.8° (e) 84.2°

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

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

(a) Mg (b) Mg sinα (c) Mg cosα

(a) Mg cosα (b) Mg sinα (c) Mg

The cable of a crane is raising a box of mass M = 250 kg with an upward acceleration of 4 m/s^{2}. What is the tension T in the cable?

(a) 863 N (b) 1725 N (c) 3450 N (d) 6900 N (e) 9980 N

(a) 115 kg (b) 231 kg (c) 364 kg (d) 462 kg (e) 1023 kg

(a) 2 N (b) 3 N (c) 5 N (d) 9 N (e) 15 N

The distance versus time plot shown below describes the motion of a runner during a work out. Based on this graph answer the following questions.

What is the average velocity of the runner during the work out?

(a) 2 miles/hour (b) 5 miles/hour (c) 8 miles/hour

(a) 0 miles / hour^{2} (b) 3.20 miles / hour^{2} (c) 6.67 miles / hour^{2}