What physical quantity is represented by the area under a curve on a PV diagram where pressure is in Pa and V is in 
?
A. Area in 
B. Work in Joules
C. Heat in Watts
D. Heat in Joules
E. Work in Calories
B. Work in Joules
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The lid of a grand piano is propped open as shown. Which arrow most closely approximates the direction of the force that the hinge exerts on the lid? Assume that the prop exerts a force in parallel to the prop’s length. (Hint: Draw a torque diagram of the lid.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
Suppose you point your telescope at a distant object. Which of the following is not an advantage of taking a photograph of the object through the telescope as compared to just looking at the object through the telescope?
A) The photograph will have far better angular resolution than you can see with your eye. B) By using a long exposure time, the photograph can allow you to see objects that would be too dim to see with your eye. C) If taken with a camera with a sensitive detector such as a CCD, the photograph can capture a much larger percentage of the incoming photons than can your eye. D) The photograph provides a more reliable record of what is seen through the telescope than can a drawing made by eye.
How does Io get heated by Jupiter?
a. auroras b. ultraviolet radiation c. infrared radiation d. tidal heating
The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (?0 = 4? × 10-7 T ? m/A)
A) 0.40 A B) 0.80 A C) 1.6 A D) 3.2 A E) 0.20 A