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 101. The exam period was 90 minutes; the mean score was 75.9; the median score was 80. Click here to see page1 page2 of the formula sheet that came with the exam.

A football player passes the ball. The ball leaves his hand and is caught 1.7 seconds later by a receiver 30 meters away. (You may assume the ball was caught at the same height from which it was thrown.)

What is the vertical component of the velocity of the ball just after it is released?

(a) v_{y} = 8.3 m/s (b) v_{y} = 21.3 m/s (c) v_{y} = 37.0 m/s

(a) |v | = 0 m/s (b) |v | = 17.6 m/s (c) |v | = 24.8 m/s

(a) |v | = 18.1 m/s (b) |v | = 19.5 m/s (c) |v | = 22.9 m/s

A 65 kg person steps onto an elevator. While riding in the elevator, the person notices their apparent weight is 767 newtons.

What do you know about the direction the elevator is moving (its velocity).

(a) up (b) down (c) not enough information

(a) |a | = 2.0 m/s^{2} (b) |a | = 5.1 m/s^{2} (c) |a | = 7.7 m/s^{2} (d) |a | = 9.8 m/s^{2} (e) |a | = 11.8 m/s^{2}

(a) t = 1.00 hours (b) t = 1.27 hours (c) t = 1.33 hours (d) t = 1.41 hours (e) t = 2.00 hours

Block A is suspended vertically by an ideal string that passes over an ideal pulley and is then connected to Block B that is resting on a frictionless ramp with incline of 35° as shown in the figure. Block B is observed to accelerate down the ramp at a rate of 3.2 m/s^{2}. The tension in the string is 45.5 N.

What is the mass of block A?

(a) m_{A} = 3.5 kg (b) m_{A} = 4.6 kg (c) m_{A} = 5.3 kg (d) m_{A} = 7.2 kg (e) m_{A} = 8.2 kg

(a) m_{B} = 6.3 kg (b) m_{B} = 7.9 kg (c) m_{B} = 5.3 kg (d) m_{B} = 18.8 kg (e) m_{B} = 23.2 kg

(a) 34 N (b) 45.5 N (c) 53.7 N

A ball is thrown vertically upward from the top of a building in Chicago with a velocity 19.6 m/s. It reaches the ground 8 seconds after it is released. This graph shows the velocity of the ball versus time t.

At what time after the ball is released (and before it hits the ground), is its velocity zero?

(a) t = 0 (b) t = 2 seconds (c) never

(a) 9.8 m (b) 19.6 m (c) 25.3 m

(a) 121 m (b) 137 m (c) 157 m (d) 172 m (e) 213 m

Three strings as shown in the figure above hold a 10 kg block. The string on the left pulls with a force of 130 N. The string in the center pulls up with a force of 125 N. Gravity points in the -y direction.

What is the vertical component of the tension in the right string, T_{Ry}?

(a) 223 N (b) 123 N (c) 115 N (d) 98 N (e) 27 N

(a) 98.N (b) 130 N (c) 148 N

(a) 175 N (b) 661 N (c) 1066 N (d) 1718 N (e) 6486 N

A heavy truck traveling on a horizontal road with the speed of 72 km/h can stop at best within 100 m. This shortest distance occurs when the driver uses anti-lock brakes, which means that the car brakes without skidding. What is the magnitude of the acceleration of the truck?

(a) 5.0 m/s^{2} (b) 3.5 m/s^{2} (c) 2.0 m/s^{2}

(a) 0.09 (b) 0.50 (c) 0.90

A 5 kg block is connected to a 2 kg block by a massless string. The force F pulls the 2 kg block to the right across a flat surface. The kinetic friction coefficient between the blocks and the surface is μ_{k} = 0.2. The acceleration of the two blocks is measured to be 1.6 m/s^{2}.

What is the magnitude of the tension T in the string?

(a) 3.2 N (b) 8.2 N (c) 9.8 N (d) 17.8 N (e) 23.3 N

(a) 7.1 N (b) 11.2 N (c) 17.8 N (d) 24.9 N (e) 42.7 N

(a) 3.2 N (b) 14.6 N (c) 17.8 N

(a) The gravitational force of the Earth on the cart is equal to the gravitational force of the cart on the Earth. (b) The force of the dog pulling the cart is equal to the frictional force by the road on the cart. (c) The gravitational force of the Earth on the cart is equal to the normal force of the road on the cart.

Joe and his dog drove up to the bridge and walked down along the river. The graph below represents their displacement from the bridge, at x = 0, as a function of time.

Which of the following statements is not true?

(a) v(120 s) = 1.67 m/s (b) v(750 s) = -3.33 m/s (c) Over the 1800 s interval between t = 0 and t = 1800 s, v_{average} = 0 m/s. (d) v(1200 s) = 0.00 m/s (e) v(1560 s) = -5.00 m/s

(T) True (F) False