A device that transforms electrical energy to mechanical energy is
1) a generator,
2) a motor,
3) a transformer,
4) any common magnet,
and a device that transforms mechanical energy into electrical energy is a
5) generator.
6) motor.
7) transformer.
Answer: 1, 5
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Pulsars cannot be spinning white dwarfs because
a. white dwarfs are not that common. b. white dwarfs are not dense enough. c. white dwarfs do not have magnetic fields. d. a white dwarf spinning that fast would fly apart. e. All of the other choices are correct.
Density: A porch roof that slopes upward at 45° measures 3.0 m × 5.0 m. It is covered with a slab of insulating material that is 2.0 cm thick. If the density of the insulation is 15 kg/m3, what is the weight of the insulation, in pounds, on the roof? (1.00 kg weighs 2.2 lb and density is mass per unit volume.)
A. 4.5 lb B. 9.0 lb C. 20 lb D. 990 lb E. 9.9 lb
Which one of the following represent correct units for electric filed strength?
a. T b. N/C c. J / C d. N • m 2 • C-2
How many octaves exist between 20 hertz and 2560 hertz?
A) 5 B) 6 C) 7 D) 8 E) 9