How are electric motors and electric generators similar? Different?
What will be an ideal response?
Answer: Both electric motors and generators are similarly-constructed devices. Both have a permanent or electromagnet and coils of wire on a rotor. They differ mainly by the roles of input and output. When input is electrical energy, the rotor is made to spin and we have a motor. When input is mechanical energy that spins the rotor, the output is electric energy and we have a generator.
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If we could see our own galaxy from 2 million light-years away, it would appear
A) as a flattened disk with a central bulge and spiral arms, spanning a few degrees across the sky. B) as a faintly glowing band of light stretching all the way around the sky. C) to fill the sky with widely spaced stars. D) like a single, dim star.
The force required to maintain a body at constant velocity in free space is equal to
1) the mass of the body. 2) zero. 3) the weight of the body. 4) the force required to stop it. 5) none of these. This is in accordance with the law of 6) inertia. 7) action/reaction. 8) gravitation. 9) energy conservation.
When a low-mass star runs out of hydrogen in its core, it gets brighter. Why?
What will be an ideal response?
What sound level change corresponds to a factor of two change in intensity?
a. 0.2 dB b. 2.0 dB c. 3.0 dB d. 11 dB e. 20 dB