The Sun is gradually increasing in brightness as it ages. Why isn't this considered to be an explanation for global warming?
A) A change in the Sun's brightness would not be expected to have any effect on Earth's average temperature.
B) The scientists are covering up this potentially valid explanation.
C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does.
D) The Sun is increasing in brightness much too slowly to be causing the current warming.
D) The Sun is increasing in brightness much too slowly to be causing the current warming.
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The energy per photon in ultraviolet light is greater than in
A) radio waves. B) microwaves. C) visible light. D) all of the above E) none of the above
What are the SI units of momentum?
a. kg m/s b. pascals c. joules d. watts
Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
Light behaves like
a. a wave at times, and a particle at other times. b. a wave. c. a particle. d. both a wave and a particle, because of its dual nature.