A gas is placed in a thermally insulated container as shown below
As the piston is slowly raised, the work done on the gas is...
1.... positive.
2.... negative.
3.... zero.
4.The sign of the work done on the gas cannot be determined.
2
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The power rating of a resistor is 0.80 W. If the value of the resistor is 400 ?, what is the maximum current it can draw?
A) 45 mA B) 18 mA C) 4.4 mA D) 2.0 mA E) 320 mA
A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. A belt exerts a frictional torque on the cylinder of 1.50 Nm. The specific heat of aluminum is 900 J/(kg•K)
How many turns of the crank are necessary to raise the temperature of the aluminum by 40 C°? A) 325 B) 650 C) 900 D) 975 E) 1300
An observer is moving in space toward a distant star at 50.0 km/s while the star is moving toward the observer at 180 km/s; the relative velocity being 230 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.077% increase b. 0.077% decrease c. 0.026% increase d. 0.23% decrease e. 0.23% increase
The Earth's ionosphere partially blocks which form of electromagnetic radiation?
A) gamma rays B) ultraviolet C) visible light D) infrared E) radio