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 112. When the exam was given, the mean was 98.7; the median was 101. Click here to see the formula sheet that came with the exam.

(a) -10 (b) -20 (c) -40 (d) -50 (e) -60

(a) too long. (b) too short. (c) accurate.

(T) True (F) False

(a) 10 cm^{3} (b) 15 cm^{3} (c) 2.4 cm^{3} (d) 5.2 cm^{3} (e) 7.8 cm^{3}

(a) T > 50 C (b) T = 50 C (c) T < 50 C

(a) closer to T_{A} than T_{W}. (b) closer to T_{W} than T_{A}. (c) exactly halfway between T_{A }and T_{W}.

(a) It would take more time. (b) It would take less time. (c) It would take the same time.

(a) 150 J/kg-C (b) 300 J/kg-C (c) 460 J/kg-C (d) 910 J/kg-C (e) 5200 J/kg-C

(a) 18 kg (b) 25 kg (c) 9.5 kg (d) 2.7 kg (e) 1.4 kg

A submarine has a small window of total area 0.0148 m^{2}. Calculate the total pressure force on the window when the submarine is at a depth of 110 m. Neglect atmospheric pressure. You may assume that the density of the surrounding fresh water is 1000 kg/m^{2}.

(a) 5000 N (b) 11000 N (c) 16000 N (d) 23000 N (e) 37000 N

(a) stays the same. (b) increases by a factor of two. (c) increases by a factor of four.

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

NASA builds a raft made of styrofoam that can just support the weight of three astronauts without submerging. The weight of each astronaut is 733 N. Neglecting the weight of the raft itself, which is very light, what is the volume of the raft?

(a) 0.11 m^{3} (b) 0.22 m^{3} (c) 0.44 m^{3} (d) 1.20 m^{3} (e) 1.50 m^{3}

(a) sink in the water. (b) float higher in the water. (c) float at the same height in the water.

(a) less than (b) more than (c) the same as

(a) 18 N (b) 39 N (c) 160 N (d) 1600 N (e) 9800 N

(a) 0.3 m/s (b) 0.4 m/s (c) 0.5 m/s (d) 0.6 m/s (e) 0.7 m/s

Many small sailboats use a passive bailing system: there is a plug in the bottom of the boat that can be opened to drain water out of the boat. This works only when the boat is moving, because only then is the pressure under the boat less than air pressure, by Bernoulli’s equation.

Consider a boat whose bailing plug is located 3 cm below the surface of the water. What is the minimum speed the boat must have so all the water drains out of the boat?

(a) 0.25 m/s (b) 0.5 m/s (c) 0.75 m/s (d) 1.0 m/s (e) 1.25 m/s

(a) v (b) 1.4 v (c) 2 v

On a horizontal frictionless table, a block of mass 0.1 kg is attached to a spring of constant k = 5 N/m and set into oscillation with amplitude A = 0.30 m.

What is the frequency of oscillation of this system?

(a) 1.13 Hz (b) 0.75 Hz (c) 2.44 Hz (d) 0.21 Hz (e) 1.97 Hz

(a) 0.12 J (b) 2.12 J (c) 1.05 J (d) 0.23 J (e) 0.85 J

You have in your toolbox a 0.25 kg mass and a ball of string. You want to make a pendulum that has a period of 0.5 seconds.

How long a string should you cut to make your pendulum? (You can neglect the mass of the string.)

(a) 6 cm (b) 15 cm (c) 28 cm (d) 39 cm (e) 47 cm

(a) L/6 (b) L (c) 6 L

(a) 30 N/m (b) 90 N/m (c) 140 N/m (d) 200 N/m (e) 250 N/m