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 84.4; the median was 87. Click here to see the formula sheet that came with the exam.

A ball, thrown from ground level, hits the ground again after an elapsed time of 3.5 seconds and after traveling a horizontal distance of 54 m. The only force acting on the ball is gravity.

What is the initial x-component of the velocity?

(a) 18.3 m/s (b) 11.2 m/s (c) 13.2 m/s (d) 19.8 m/s (e) 15.4 m/s

(a) 17.2 m/s (b) 11.6 m/s (c) 20.7 m/s (d) 7.23 m/s (e) 5.67 m/s

(a) 67 m (b) 15 m (c) 18 m (d) 93 m (e) 22 m

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

(a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4 (e) 0.5

(a) sqrt(2) D (b) 2 D (c) 4 D

(a) 1 ft/s (b) 4 ft/s (c) 5 ft/s

(T) True (F) False

A car of mass 1200 kg rounds a corner of radius R = 55 m. The coefficient of static friction between the tires and the road is µ_{s} = 0.75.

What is the maximum speed the car can have without skidding?

(a) 6.5 m/s (b) 8.5 m/s (c) 12 m/s (d) 17 m/s (e) 20 m/s

(a) sqrt(2) V (b) V (c) 2 V

(a) 2.4 m/s (b) 3.8 m/s (c) 4.5 m/s (d) 5.6 m/s (e) 7.2 m/s

A satellite is in circular orbit at a fixed radius from the center of the earth and with a constant speed. Which one of the following statements is correct about the satellite?

(a) The acceleration is constant but the velocity is not. (b) Both the acceleration and the velocity are constant. (c) Neither the acceleration nor the velocity are constant.

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

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

(a) -13.7 J (b) 15.6 J (c) -29.4 J (d) -10.3 J (e) not possible to say without more information

You exert a horizontal force on a 75-kg box, pushing it across a floor at a constant speed. The coefficient of sliding friction between the box and floor is µ _{k} = 0.55.

How much work do you do after pushing the box a distance of 15 m?

(a) 2050 J (b) 2250 J (c) 4500 J (d) 6070 J (e) 8050 J

(a) W (b) 0 (c) -W

(a) sqrt(6) H (b) 6 H (c) 36 H

In the figure are shown three possible ways you can apply a force to slide a block across a rough horizontal surface. The magnitude of the applied force is the same in each case. In which case is the frictional force the least?

(a) case A (b) case B (c) case C

(a) 7.45 m/s^{2} (b) 2.45 m/s^{2} (c) 0 m/s^{2} (d) 1.34 m/s^{2} (e) 4.56 m/s^{2}

A block of mass 0.25 kg is connected to a cart of mass 0.75 kg by a string and pulley, as shown in the figure above. There is no friction as the cart is rolling on the horizontal track. What is the acceleration of the cart?

(a) 3.57 m/s^{2} (b) 4.12 m/s^{2} (c) 2.45 m/s^{2} (d) 2.95 m/s^{2} (e) 10.2 m s^{-2}

(a) 1.84 N (b) 0.76 N (c) 2.79 N (d) 1.27 N (e) 4.21 N

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

(a) The elevator is going up and is slowing down. (b) The elevator is going down and is speeding up. (c) The elevator is going up with constant speed.

(a) The car has a constant speed. (b) The car’s speed is getting larger. (c) The car’s speed is getting smaller.