Assuming muscles are 20% efficient, at what rate is a 60. kg boy using energy when he runs up a flight of stairs 10. m high, in 8.0 s?
What will be an ideal response?
147 kW
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From which language did the majority of star names originate?
a. Arabic b. Latin c. Greek d. Spanish e. Italian
Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a:
A) normal spiral galaxy. B) barred spiral galaxy. C) very flat elliptical galaxy. D) very dusty irregular galaxy. E) quasar.
Why didn't oxygen begin to accumulate in the atmosphere until approximately 1.5 billion years after life appeared on Earth?
A) Early forms of animal life consumed the oxygen. B) Early forms of plant life consumed oxygen. C) All the oxygen produced by life went into making the ozone layer. D) Oxygen produced by life was removed from the atmosphere by oxidation reactions with surface rocks. E) Oxygen produced by life was removed from the atmosphere by dissolving in the ocean.
To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge?
A) 10 m B) 14 m C) 26 m D) 32 m E) 52 m