Thermodynamic Devices: An air conditioner with a coefficient of performance of 3.50 uses 30.0 kW of power to operate. What power is it discharging to the outdoors?
A. 30.0 kW
B. 75.0 kW
C. 105 kW
D. 135 kW
E. 210 kW
Answer: D
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A key step in the destruction of ozone by chlorofluorocarbons is
A) the chlorofluorocarbon molecule separates, resulting in free carbon which produces a greenhouse effect. B) the chlorofluorocarbon molecule directly combines with atmospheric ozone. C) carbon atoms react with ozone. D) radiation from the sun separates chlorofluorocarbon, resulting in free chlorine. E) radiation from the sun breaks down O3 molecules.
An electron vibrating to and fro 1000 times per second generates an electromagnetic wave having a
A) period of 1000 s. B) speed of 1000 m/s. C) wavelength of 1000 m. D) frequency of 1000 Hz.
After a supernova event, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) either a neutron star or a black hole
A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 040 m. The parachute deploys, and she lands on the ground with a speed of 4.0 m /s. How much energy was lost to air friction during this jump?
a. 4.0E+2 J b. 8.2E+4 J c. 4.3E+5 J d. 5.1E+5 J e. 6.4E+5 J