Ozone depletion in the upper atmosphere is likely to cause
A) heating of the atmosphere.
B) melting of the polar ice caps.
C) Both of the above.
D) skin cancer.
E) acid rain.
D
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A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
The open spaces in the crystal lattice of ice contain
A) vapor. B) trace amounts of water. C) nothing.
A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g
By comparing this activity with the activity of living organic matter, which is 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. Carbon-14 has a half-life of 5730 years. If the activity of living matter has been constant over time, how old is the sample of wood? A) 3870 years B) 4250 years C) 4590 years D) 2630 years E) 2940 years
The axes on a Hertzsprung-Russell (H-R) diagram represent
A) luminosity and surface temperature. B) mass and luminosity. C) luminosity and apparent brightness. D) mass and radius.