Transformers: An ideal step-up transformer doubles a primary voltage of 110 V. What is the ratio of the number of turns in its primary coil to the number of turns in the secondary coil?
A. 1:4
B. 4:1
C. 2:1
D. 1:2
E. 1:8
Answer: D
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The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?
A) It can do work more quickly B) It can operate for a longer time. C) It can burn fuel more efficiently. D) It can store more potential energy.
The period before the separation of the gravitational force is the Planck Epoch
Indicate whether the statement is true or false
A boat loaded with ice is floating in a swimming pool. If the ice is thrown into the pool, the water level in the pool, once the ice stops bobbing and floats steadily,
A) rises. B) falls. C) stays the same. D) There is not enough information to answer this question.
How did James Joule determine how much work is equivalent to how much heat?
a. By attaching a team of horses to cannon-boring equipment. b. By repeating Rumford's experiments but measuring the amount of heat created. c. By defining one horsepower as the rate that a very strong horse does work. d. By creating a system where he could change the heat either with work or with external heat sources. e. By heating a gram of water by one degree.