A current may be induced in a coil by
A. moving one end of a bar magnet through the coil.
B. moving the coil toward one end of the bar magnet.
C. holding the coil near a second coil while the electric current in the second coil is increasing.
D. all of the above.
E. none of the above.
Answer: D
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A car is initially traveling west at 25 mph, and makes a turn north. As the car finishes the turn, its velocity is 20 mph north. It takes 3.5 seconds to complete the turn. What is the average acceleration of the car while it is turning, in mph/s? Let east be the positive-x direction and north be the positive-y direction.
a. -7.1i + 5.7j b. 7.1-5.73 c. 571-7.13 d. -5.7i+71.
Our Sun is a first-generation star.
Answer the following statement(s) true (T) or false (F)
The supernova of 1054 AD produced:
A) a remnant still visible to the naked eye, the Crab Nebula, M-1. B) a pulsar with a period of 33 milliseconds, visible optically. C) the closest known neutron star to our Sun. D) the most famous black hole. E) no remaining visible trace, as it was a type I supernova.
An astronaut traveling with a speed v = 0.90 c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m b. 2.3 m c. 0.19 m d. 0.43 m e. 0.81 m