The function of the electric motor is which one of the following conversion processes?
a. mechanical energy to electrical
c. low voltage to high or vice versa
b. alternating current to direct
d. electrical energy to mechanical
D
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The slopes of Olympus Mons are relatively free of impact craters. What does this imply about its history?
A. Olympus Mons has erupted in the last 250 million years. B. Olympus Mons was once submerged in water. C. The mountain is tall enough to be eroded by planetary dust storms. D. It is one of the oldest features on Mars.
What is a white dwarf?
A) the exposed core of a dead star, supported by electron degeneracy pressure B) the exposed core of a dead star, supported by neutron degeneracy pressure C) a hot, but very small main-sequence star with a mass of less than 1.4 solar masses D) a cool and very small main-sequence star with a mass of less than 1.4 solar masses E) the name for the singularity at the center of a black hole
The magnitude of the electric field at a point P for a certain electromagnetic wave is 570 N/C. What is the magnitude of the magnetic field for that wave at P? (c = 3.0 × 108 m/s)
A) 2.91 µT B) 1.90 µT C) 2.41 µT D) 1.41 µT E) 1.10 µT
A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed
What is the thickness of the thread? A) 22.3 ?m B) 26.7 ?m C) 32.3 ?m D) 53.3 ?m E) 76.3 ?m