The standard unit of time in the mks system is the
a. meter
b. kilogram
c. second
d. minute
e. microsecond
c
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The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that
A) a force is acting on the planets. B) the planets are always accelerating. C) the planets have angular momentum. D) the planets will eventually fall into the Sun.
What is the main factor that makes Earth more geologically active than the other terrestrial planets?
A) It is larger, so it has retained its internal heat for longer. B) It is farthest from the Sun, so it receives less light. C) It has a large Moon, so it is heated by tidal forces. D) It has far more radioactive material than other planets. E) It formed much later than the other planets.
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is parallel to the magnetic field?
A) zero B) 0.41 m?N C) 0.47 m?N D) 0.52 m?N E) 0.59 m?N
If you drop an object, it will accelerate downward at a rate of 10 m/s2. If you instead throw it downward, its acceleration (in the absence of air resistance will be
A) less than 10 m/s2. B) 10 m/s2. C) greater than 10 m/s2.