To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
4.3 MJ, 1.2 kWh
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A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 103 kg/m3.)
A. 5.9 B. 4.5 C. 6.4 D. 3.9 E. 3.1
Which time frame(s) do we live in today? (More than one may apply.)
A) Quaternary period B) Tertiary period C) Cenozoic era D) Phanerozoic eon E) Paleozoic era
Which of the following can change the frequency of a wave?
a. interference b. the Doppler effect c. diffraction d. all of the above
Suppose that a car traveling to the east (+x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A) Its acceleration is in the +x direction. B) Its acceleration is in the -x direction. C) Its acceleration is zero. D) Its acceleration is decreasing in magnitude as the car slows down.