An object that completes 20 vibrations in 10 seconds has a frequency of
A) 0.5 hertz.
B) 1 hertz.
C) 2 hertz.
D) 200 hertz.
Answer: C
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A) a B) b C) c D) d E) none of the above
No matter where you live on Earth, the Sun always rises and sets each day
Indicate whether the statement is true or false
A roofer lifts supplies a height of 20. m with a hand-operated winch. How long would it take him to lift a 200. kg load, if the winch has an efficiency of 90%, and the rate at which the winch can do work is 0.80 hp?
What will be an ideal response?
Where are most elements heavier than hydrogen and helium made?
A) in the gas between the stars B) in the cores of stars, in supernovae, and during neutron star mergers C) All elements were made about 5 minutes after the universe began. D) in the cool atmospheres of red giant stars E) in white dwarfs