During each cycle of its operation, a certain gasoline engine consumes 500 joules of chemical energy, while exhausting 300 joules of thermal energy to the environment. The energy efficiency of this heat engine is
A) 60%.
B) 40%.
C) 67%.
D) 20%.
E) None of the above.
B
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Evaluate the Reynolds number for flow over a tube from the following data
GIVEN
FIND
The Reynolds Number (Re)
The date is September 21 and the Moon is at full
phase. An observer who sees this moon on her overhead meridian at this time a) sees the Sun setting. b) sees the Sun rising. c) cannot see the Sun. d) sees the Sun overhead.
A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?
A) 3.7 keV B) 7.8 keV C) 8.7 keV D) 7.8 MeV E) 8.7 MeV
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94 ? b. 0.81 ? c. 0.58 ? d. 0.69 ? e. 1.5 ?