Why doesn't the Moon fall toward Earth like apples do?
A) the great distance of the Moon prevents falling
B) moon's small mass prevents falling
C) moon does fall but its great distance keeps it from getting closer
D) moon does fall but due to its tangential motion it also falls around Earth
Answer: D
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Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water B) slightly cooler, but still above freezing C) slightly warmer, but still well below the boiling point of water D) about the same as it is now
What normally occurs in a saucer of water placed on your table is
A) evaporation. B) condensation. C) both of these D) none of the above
A metal wire has a resistance of 14.00 ? at a temperature of 25.0°C. If the same wire has a resistance of 14.55 ? at 90.0°C, what is the resistance when its temperature is ?32.0°C?
a. 2.21 ? b. 13.5 ? c. 5.13 ? d. 39.2 ? e. 13.0 ?
A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
a. -6.1 J b. -4.6 J c. -5.3 J d. -6.8 J e. -2.7 J