A lens of focal length 1500 mm is used to project an in image of the sun. If the sun subtends an angle of 
what is the diameter of the image?
A. 60 mm
B. 30 mm
C. 26 mm
D. 6.5 mm
E. 13 mm
E. 13 mm
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A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 b. 3/8 c. 7/16 d. 9/16 e. 3/4
The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200 ?, L = 0.100 H, and C = 1.00 ?F. What are the impedance Z and the phase angle ??
a. 200 ?, ?37.0° b. 566 ?, +87.0° c. 2470 ?, ?85.4° d. 2540 ?, ?88.8° e. 393 ?, ?63.0°
The Doppler effect states that the motion of any object can
a. shift the wavelength of spectral lines. b. change the speed of light emitted from the object. c. enhance the chemical composition of the object. d. make the object appear hotter. e. make the object appear cooler.
Notice that the peaks and troughs on the temperature graph occur at the about the same times as peaks and troughs on the carbon dioxide graph. What can we infer from this fact alone?
A. Higher global average temperatures cause higher carbon dioxide concentrations. B. Higher carbon dioxide concentrations cause higher global average temperatures. C. The carbon dioxide concentration is inversely related to the global average temperature. D. There is a correlation between the carbon dioxide concentration and the global average temperature.