If an object absorbs more energy than it emits, its
A) thermal energy decreases.
B) temperature decreases.
C) both of these
D) none of the above
Answer: D
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Perigee is the point in ____
a. the Moon's orbit when the Moon is farthest from Earth b. an object's orbit around Earth when the object is closest to Earth c. an object's orbit around Earth when the object is closest to the Sun d. a planet's orbit when the planet is closest to its sun e. a planet's orbit when the planet is farthest from its sun
An astronaut at rest has a heart rate of 65 beats/min. What will her heart rate be as measured by an earth observer when the astronaut's spaceship goes by the earth at a speed of 0.80c?
a. 108 beats/min c. 81 beats/min b. 39 beats/min d. 52 beats/min
Water is sent from a fire hose at 40 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the water?
a. 7.5 m c. 15 m b. 11 m d. 20 m
Mineralogical analysis of a rock can tell us
A) the detailed geological history of the rock B) what the rock is made of C) when the rock formed D) the temperature and pressure conditions under which it formed