If you thrust a magnet into a closed loop of wire, the loop will
A) rotate.
B) have a current in it.
C) both of these
D) neither of these
Answer: B
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Why is the Moon's average surface temperature so much lower than Earth's?
A. The Moon has no atmosphere to help retain heat at its surface. B. The Moon's rotation rate is much slower than Earth's. C. The Moon is much smaller than Earth and cooled more quickly. D. The Moon reflects more of the Sun's energy than Earth. E. The Moon has no magnetic field to prevent infrared radiation from escaping.
Arnold Strongman wearing socks and Suzie Small in gym shoes have a tug-of-war on a polished floor. The likely winner is
A) Arnold. B) Suzie. C) neither, a tied score D) no basis for predicting
Which of the following energy transformations represents the operation of a wind turbine [a device that uses the wind as an energy resource]?
A) Thermal E ? Electric E B) Electric E ? Kin E C) Grav E ? Electric E D) Kin E ? Electric E
Raising the temperature of air will
1.decrease the speed of sound in the air. 2.increase the speed of sound in the air. 3.not affect the speed of sound in the air. 4.sometimes increase and sometimes decrease the speed of sound in air.