The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis
a. True
b. False
Indicate whether the statement is true or false
False
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Spherical Mirrors: When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?
A. 27 cm B. 40 cm C. 80 cm D. 160 cm
An element with atomic number 88 goes through alpha decay. Its atomic number is now
A) 80. B) 82. C) 84. D) 86. E) 88.
One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
A) 26.1 Hz B) 8.7 Hz C) 4.35 Hz D) 30.4 Hz E) 17.4 Hz
How much heat (in kilocalories) is needed to convert 1.00 kg of ice at 0°C into steam at 100°C?
a. 23.9 b. 79.6 c. 564 d. 643 e. 720