When a current flows through an inductor, its mass
A) decreases.
B) increases.
C) stays the same.
D) oscillates.
B
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The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satellite's weight at the altitude of its orbit?
A) 61 N B) 110 N C) 9000 N D) 16,000 N
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4sin(5x)cos(6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
The Bohr theory of the atom made which of the following BOLD assumptions?
A. The stable orbits are maximally occupied with electrons B. All atoms contain "special" electrons that do not radiate their energy C. Electrons in certain orbits do not radiate electromagnetic waves despite being centripetally accelerated D. The electrons in some orbits are paired so as to become stable
Which of the following would not protect low carbon steel from corrosion in contact with an electrolyte?
(a) Coat the steel completely with copper (b) Attach the steel to the positive terminal of a 12 V battery (c) Attach a piece of zinc to the steel in the area exposed to electrolyte (d) Completely paint the steel