How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g/°C.)
a. 190
b. 200
c. 240
d. 210
e. 50
d
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What is the maximum kinetic energy of a 2.00-kg mass moving with simple harmonic motion with an amplitude 5.00 cm and period 0.300 s?
A) 1.10 J B) 0.444 J C) 0.222 J D) 0.174 J E) 0.0278 J
The Trojan asteroids have orbits that:
A) are, on average, closer to the Sun than we are. B) cross the orbit of Earth at perihelion. C) cross the orbit of Mars, but not Earth, at perihelion. D) stay sixty degrees ahead of or behind Jupiter. E) stay out beyond Neptune.
Radiometric dating is based on
A) decay of uranium-238 to lead-206. B) sequence of rocks and the relative position of one layer to another. C) proportions of radioactive isotopes and their decay products. D) the half-life of radioactive atoms.
What are all the black spots on this object?
A) volcanoes on Jupiter's moon Io B) methane lakes on Saturn's moon Titan C) impact craters on Uranus's moon Miranda D) wind streaks on Neptune's moon Triton E) giant cliffs on the planet Mercury