A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the momentum of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 2.51 × 10-19 kg ? m/s
B) 2.89 × 10-19 kg ? m/s
C) 4.34 × 10-19 kg ? m/s
D) 5.01 × 10-19 kg ? m/s
E) 8.68 × 10-19 kg ? m/s
E
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Calorimetry: A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?
A. 34°C B. 36°C C. 38°C D. 40°C
An airplane is flying in horizontal flight at a constant acceleration of 2.00 
The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force which is parallel to the wing is 2,000 N. The forward thrust force the engine produces is
A. 2,800 N. B. 4,000 N. C. 7,500 N. D. 8,000 N. E. 10,200 N.
The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 ? 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 
direction?
a.
36 J
b.
39 J
c.
43 J
d.
46 J
e.
30 J
If we double only the amplitude of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of . B) increases by a factor of 2. C) increases by a factor of 3. D) increases by a factor of 4. E) does not change.