The law of conservation of momentum applies to a collision between two bodies since
a. they exert equal and opposite forces on each other.
b. they exert forces on each other respectively proportional to their masses.
c. they exert forces on each other respectively proportional to their velocities.
d. they exert forces on each other respectively inversely proportional to their masses.
e. their accelerations are proportional to their masses.
a
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When you flip a switch to turn on a light, the delay before the light turns on is determined by:
a. the number of electron collisions per second in the wire. b. the drift speed of the electrons in the wire. c. the speed of the electric field moving in the wire. d. none of these, since the light comes on instantly.
Which form of electromagnetic radiation would be blocked in the stratosphere by ozone?
A) cosmic rays B) ultraviolet C) visible light D) infrared E) microwaves
Two equal charges repel one another with a force of 4.0 × 10-4 N when they are 10 cm apart. (Coulomb's constant is k=9.0 × 109 N.m2/C2.) If they are moved until the separation is 5 cm, the repulsive force will be
A. 4.0 × 10-4 N. B. 64 × 10-4 N. C. 0.25 × 10-4 N. D. 1.0 × 10-4 N. E. 16 × 10-4 N.
The mean free path of air molecules at room temperature and atmospheric pressure is about:
A. 10?3 m B. 10?5 m C. 10?7 m D. 10?9 m E. 10?11 m