When an object is polarized, it
A. must contain more positive charge than negative charge.
B. must contain more negative charge than positive charge.
C. will have a separation of positive and negative charge.
D. must be illuminated by polarized light.
E. must be made of metal.
C. will have a separation of positive and negative charge.
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An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m b. 41 m c. 57 m d. 46 m e. 37 m
The type of heat transfer that occurs between the radiator of a car and the atmosphere, when the car is in motion, is principally
A) convective. B) conductive. C) radiative. D) countercurrent. E) evaporation.
Why does a parachutist stop accelerating downward after opening the chute and then falling some distance?
a. Because of the influence of the parachute, there is no longer a pull on the parachutist due to gravity. b. The parachutist's weight becomes zero as a result of the tug of the parachute. c. Air resistance produces a pull on the parachutist that is equal and opposite to the pull of gravity. d. The speed of freely falling objects is a constant. e. All objects fall with the same acceleration.
What shows directly that there is a nuclear force?
a. The fact that electrons congregate around the nucleus. b. The fact that nuclei can lose nucleons. c. The relatively large mass of protons and neutrons compared to the electrons. d. The fact that electrons can change shells around the nucleus. e. The fact that so many nuclei are stable and hold together despite the repulsion between their positive charges.