If you push for an hour against a stationary wall, you do no work
A) on the wall.
B) at all.
C) both of these
D) none of the above
Answer: A
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How is Einstein's famous equation, E= mc2, important in understanding the Sun?
A) It explains the fact that the Sun generates energy to shine by losing some 4 million tons of mass each day. B) It explains why the Sun's surface temperature is about 6,000°C. C) It explains why the Sun is so massive. D) It explains why the Sun has a magnetic field strong enough influence the atmospheres of the planets.
You use a spring scale to suspend an object. The spring scale reads 7.84 N when the object is in air and 6.86 N when the object is immersed in water of density 1000 kg/m3. What is the density of the object?
A) 6000 kg/m3 B) 7000 kg/m3 C) 8000 kg/m3 D) 9000 kg/m3
A rock that is readily attacked by chemical weathering is
A) limestone. B) granite. C) basalt. D) gneiss.
An average lapse rate of 2.7 °F/1000 ft is equivalent to
a. 1.5 °C/m. b. 4.0 °C/1000 ft. c. 5.0 °C/km. d. 6.5 °C/1000 m.