How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
a) same amount of work
b) twice the work
c) 4 times the work
d) 8 times the work
Ans: c) 4 times the work
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The temperature of a quantity of ideal gas in a sealed container is increased from 0°C to 819°C. What happens to the speed of the molecules with average kinetic energy of the gas as a result of this temperature increase?
a. It does not change since this speed is independent of temperature. b. It increases but it is less than double the original speed. c. It doubles. d. It quadruples.
Two parallel surfaces are separated by 1 m. One of the surfaces has a temperature of 177ºC and the other surface is 27ºC. A heat shield is placed midway between the two surfaces. Estimate the shield temperature.
What will be an ideal response?
The oxygen in Earth's atmosphere
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. all of these e. none of these
What is the resonant frequency of a 1.0
F capacitor and 15 mH coil in series?
A. 15 kHz B. 1.3 kHz C. 0.87 kHz D. 57 kHz