If a wave has a frequency of 12 Hz, it has a period of

a. 1/12 s.
b. 3.5 s.
c. 144 s.
d. 12 s.


Answer: a. 1/12 s.

Physics & Space Science

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You see a leaf falling to the ground with constant speed. When you first notice it, the leaf has initial total energy PEi + KEi. You watch the leaf until just before it hits the ground, at which point it has final total energy PEf + KEf. How do these total energies compare?

a) PEi + KEi > PEf + KEf b) PEi + KEi = PEf + KEf c) PEi + KEi < PEf + KEf d) impossible to tell from the information provided

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If the universe is closed and finite, then

a. the universe will expand forever b. the universe has a center c. the universe has an edge d. none of the above

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Comets are not actually members of the solar system, but have been captured by the Sun

Indicate whether the statement is true or false

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A room has a volume of 50 m3 and is filled with air of an average molecular mass of 29 u. What is the mass of the air in the room at a pressure of 1.0 atm and temperature of 26°C? R = 0.082 L/atm/mol/K

a. 180 kg b. 42 kg c. 59 kg d. 30 kg e. 23 kg

Physics & Space Science