Which of the following is TRUE?
A. Mercury has a very thick atmosphere made mostly of carbon dioxide.
B. Venus has no volcanos on its surface.
C. Mercury rotates exactly one and a half times for every one revolution around the Sun.
D. The runaway greenhouse effect causes the present temperatures on Mars to exceed those on Earth.
E. The average surface temperature of Venus is about 30 degrees Fahrenheit.
Ans: C. Mercury rotates exactly one and a half times for every one revolution around the Sun.
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Various new quantities are introduced in this chapter, each having associated units. Which of the following quantities is followed by the wrong SI unit for that quantity?
1.resistivity, ?·m 2.temperature coefficient of resistivity, (°C)-1 3.electric power, kWh 4.drift speed, m/s
As a body heats, the radiation it emits ________.
A. decreases in intensity B. peaks at a shorter wavelength C. increases in wavelength D. peaks at a longer wavelength E. All of these choices are correct.
Plane A is flying at 600 mph in the northeast direction relative to the Earth. Plane B is flying at 500 mph in the north direction relative to the Earth. What is the speed of Plane B as observed from Plane A?
a. 900 mph c. 357 mph b. 431 mph d. 100 mph
A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about
A) 1/2 N. B) 1 N. C) 5 N. D) 7.5 N. E) 10 N.