An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
A. 0 K.
B. 0°C.
C. 0°F.
D. 0°R.
E. the same as the temperature of the heat source.
Answer: A
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 2.0 seconds from the start?
A. 0.37 
B. 0.30
C. 0.28
D. 0.21
E. 0.16
What is the phase angle of an AC series circuit that is constructed of a 14.5-? resistor along with 16.5-? inductive reactance and 9.41-? capacitive reactance?
a. 26.1° b. 11.9° c. 43.1° d. 35.0° e. 38.7°
If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 2.0 km/s B) 3.8 km/s C) 1.9 km/s D) 4.1 km/s E) 5.2 km/s
Uranium-238 decays to Thorium-234 by emitting which of the following?
a. beta b. alpha c. gamma d. positron