In many ways, an electric circuit is like the plumbing system in your home. The voltage on an electric circuit corresponds to the ________ in a plumbing system.
A. pressure
B. drain
C. faucet or valve
D. trap
Answer: A
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Scientists have detected thousands of gamma ray bursts. The evidence suggests that most or all of these bursts
A) have occurred in the central regions of the Milky Way. B) have occurred in distant galaxies. C) come from the same types of close binary systems that produce X-ray bursts. D) come from the Oort cloud surrounding the Sun.
The reason neutrinos are so penetrating is that
A) they are very heavy. B) they feel only strong nuclear force, and gravity. C) they are very light. D) they feel only the weak nuclear force, and gravity. E) they move so fast.
The ideal gas in a sealed container has its absolute temperature quadrupled. What happens to the average time between molecular collisions in the gas?
a. It stays the same. b. It decreases to half its original value. c. It decreases but not to half its original value. d. It increases.
An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 4.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 680 
A. 1.50 cm B. 1.43 cm C. 1.36 cm D. 1.28 cm E. 1.15 cm