When a baseball pitcher throws a curve ball, he makes the ball spin about an axis ________ the direction in which the ball's center of mass is moving
A) parallel to
B) perpendicular to
C) 45° with respect to
B
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Current: When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to
A. 10 m/s. B. the speed of light. C. 1 mm/s. D. 1 km/s. E. 1 m/s.
Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?
A) It is doubled. B) It is quadrupled. C) It increases by a factor of 8. D) It remains the same. E) None of the other choices is correct.
A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done on the gas during this process?
A) 0 J B) 400 J C) -400 J D) -200 J E) 200 J
Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. What is the maximum angle for light rays inside the fiber with respect to the cable’s axis for which the light will be fully transmitted thanks to total internal reflection?
A. 30o B. 60o C. 41o D. 49o