Refracting Telescope: Cal is viewing the Moon with his new telescope, using a 10-mm focal length eyepiece. For greater detail, he wishes to double the magnification of his telescope. An eyepiece having which one of the following characteristics will accomplish this for him?
A. 40 diopters
B. 8 mm
C. 12 mm
D. 200 diopters
E. 5 diopters
Answer: D
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An ideal Carnot engine operates between reservoirs having temperatures of 125°C and -20°C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00°C
The heat of fusion of water is 3.34 × 105 J/kg and the heat of vaporization of water is 2.25 × 106 J/kg. (a) How much work does this engine do each cycle? (b) How much heat per cycle does this engine absorb at the hot reservoir?
An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?
A. 2,640 Hz B. 2,559 Hz C. 2,324 Hz D. 2,139 Hz E. 2,003 Hz
The photoreceptors responsible for color vision are called ______________
Fill in the blank(s) with correct word
A series circuit is a current divider and a parallel circuit is a voltage divider circuit
Indicate whether the statement is true or false