When wind encounters a wind turbine that produces energy, wind speed on the downside of the blades is
A) slowed.
B) speeded up.
C) not affected.
Answer: A
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Venus has a higher uncompressed density than Earth
Indicate whether the statement is true or false
A ball thrown upward reaches its maximum height and then falls back. If air resistance is negligible, its acceleration is
A. the same at all points in the motion. B. less on the way up than on the way down. C. the same up and down but zero at the top. D. less on the way down than on the way up.
The voltage induced in self-inductions is
A) always in a direction opposing the changing voltage that produced it. B) likely higher than the changing voltage that causes it. C) both of these D) neither of these
This figure illustrates Joule's apparatus for determining the equivalence of work and heat. The paddles inside the cylinder are connected via pulleys to a weight (yellow). As the weight falls, the paddle wheel turns, and the water's temperature goes up. If the weight falls rapidly and hits the table on which the apparatus is resting, what goes wrong with the measurement? (Hint: See page 256 to
read more about this scenario.) a. It would cause some of the water to spill. b. Some of the energy would be transmitted in the form of heat to the table instead of the water. c. The paddles must turn slowly to transmit energy to the water. d. The weight must move slowly to do all the work it can.