A telescope has an objective lens with a focal length of 90 cm and an eyepiece of focal length 3.0 cm. What is the angular magnification of the telescope?
a. 180
c. 60
b. 33
d. 30
D
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A 5-gallon container of water (approximately 20 kg) having a temperature of 212°F is added to a 50-gallon tub (approximately 200 kg) of water having a temperature of 50°F. What is the final equilibrium temperature (in °C) of the mixture?
A. 54 B. 36 C. 18 D. 66 E. 14
The center of a long uniform log is raised to shoulder level while the other end is on the ground. If instead, the end of the log is raised to shoulder level, the work required is
A) half. B) the same. C) twice.
Suppose one twin takes a ride in a space ship traveling at a very high speed to a distant star and back again, while the other twin remains on Earth. The twin that remained on Earth predicts that the astronaut twin is
A) younger. B) the same age. C) older. D) cannot be determined from the given information
If a volume of air is warmed, it expands and tends to
A) warm. B) cool. C) neither of these