If two protons are moved 3 times farther apart, the electrical force between them is what factor of the original force?
One-ninth
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A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
A. increase the tension on the hose and shake the end more times per second. B. decrease the tension on the hose and shake the end more times per second. C. increase the tension on the hose and shake the end fewer times per second. D. decrease the tension on the hose and shake the end fewer times per second. E. keep the tension and frequency the same but increase the length of the hose.
A heat exchanger is to be designed to heat a flow of molten bismuth from 377°C to 477°C. The heat exchanger consists of a 50-mm-ID tube with surface temperature maintained uniformly at 500°C by an electrical heater. Find the length of the tube and the power required to heat 4 kg/s and 8 kg/s of bismuth.
GIVENS
FIND
The length (L) tube and power required (q) to heat 4 kg/s and 8 kg/s of bismuth
ASSUMPTIONS
Steady state
Uniform and constant surface temperature
Losses from the heater are negligible
SKETCH
PROPERTIES AND CONSTANTS
for Bismuth at the average bulk temperature of 427°C
The Zeeman effect can be used to determine the _______ our Sun and other stars
a. rotation speed of b. mass of c. color of d. magnetic field on e. radial velocity toward or away from
Which photo shows what we call a first-quarter moon? (Note: Assume these photos were taken in the Northern Hemisphere.)
A) 1 B) 2 C) 3 D) 4