A driver in a car traveling at slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m
B) 21 m
C) 33 m
D) 24 m
Answer: A
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A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency?
Which hypothetical universe will eventually contract, if there were no dark energy?
A) the universe with 1.5 times the critical density of matter B) the universe with 1.0 times the critical density of matter C) the universe with 0.5 times the critical density of matter
Why do the jovian planet interiors differ?
A) Accretion took longer further from the Sun, so the more distant planets formed their cores later and captured less gas from the solar nebula than the closer jovian planets. B) They differ due to giant impacts at the late stages of planet formation. C) The more distant planets had longer to form than the closer planets, since the solar nebula lasted longer at greater distances from the Sun. D) The more distant planets formed in a cooler region of the solar nebula and therefore contain a greater proportion of ices than the closer jovian planets.
A discrete spectrum is one that
A) only has wavelengths longer than the visible. B) never yields a line spectrum. C) yields a line spectrum. D) has continuous wavelengths. E) only has wavelengths in the visible.