Evidence that the recent rise in carbon dioxide concentration is due to human activity and not natural factors comes from
A) the amount of the rise in the atmospheric concentration tracks almost perfectly with the amount of carbon dioxide being released by industry
B) estimates of changes in the amount of carbon dioxide from natural sources such as volcanoes and the oceans can account for no more than about 1% of the rise in the atmospheric concentration
C) the ratio of carbon isotopes is consistent with the increase in carbon dioxide levels coming primarily from the burning of fossil fuels
D) all of these constitute evidence
D
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A hot (70°C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g•°C. John drops the metal into a 500-g calorimeter containing 40 g of water at 20°C. The calorimeter is constructed of a material that has a specific heat of 0.10 cal/ g•°C. When equilibrium is reached, what will be the final temperature? (cwater = 1.00 cal/g•°C.)
a. 114°C c. 40°C b. 72°C d. 37°C
During ?- decay
A) a neutron is transformed to a proton. B) a proton is transformed to a neutron. C) a neutron is ejected from the nucleus. D) a proton is ejected from the nucleus. E) the number of nucleons increases.
Free Fall: An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s2 and there is no air. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the depth of the crater is 120 m, how long does it take for the rock to fall to the bottom of the crater?
A. 3.04 s B. 12.2 s C. 29.3 s D. 32.1 s E. 37.5 s
Coulomb's Law: Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually diminishes on both spheres by leaking off. When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force on each one?
A. 1/16 F
B. 1/8 F
C. 1/4 F
D. 1/2 F
E. 1/
F