An electrical generating plant operates at a boiler temperature of 218°C and exhausts the unused heat into a nearby river at 24°C. What is the maximum theoretical efficiency of the plant? (0°C = 273 K)
a. 16%
b. 62%
c. 63%
d. 40%
e. 73%
d
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Force on a Moving Charge: A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A. upward B. northward C. southward D. eastward E. westward
Which of the following sound frequencies lie(s) in the audible range?
a. 13 Hz b. 5 kHz c. 1 MHz d. All of these
The angle of the Sun's rays striking Earth's surface greatly affects the
A) Earth's seasons. B) equatorial and polar regions. C) intensity of solar energy received at Earth's surface. D) distribution of solar energy—from the poles to the equator, hours of daylight, and the seasons.
Which of the following statements is not an observed pattern of motion in our solar system?
A) Most planets orbit at the same speed. B) All planets orbit the Sun in the same direction. C) Most planetary orbits lie nearly in the same plane. D) Most planets rotate in the same direction in which they orbit. E) Almost all moons orbit their planet in the same direction as the planet's rotation.