The center of mass of a human body is located at a point that
A) is fixed, but different for different people.
B) is always directly behind the belly button.
C) changes as a person bends over.
D) none of the above
Answer: C
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The greenhouse effect always results in a(n) ________ surface temperature
Fill in the blank(s) with correct word
The specific heat capacity of water is about twice the specific heat capacity of ice. The amount of heat required to raise the temperature of 1 kg of water 10°C is __________ times the amount of heat required to raise the temperature of 1 kg of ice 10°C
Fill in the blank(s) with correct word
I use a rope 1.00-m-long to swing a 1.00-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?
a. 20.0 J
b. 31.4 J
c. 123 J
d. 0
Energy Density: The energy density of an electromagnetic wave in free space is
A. entirely in the electric field. B. entirely in the magnetic field. C. 1/4 in the electric field and 3/4 in the magnetic field. D. 1/4 in the magnetic field and 3/4 in the electric field. E. equally divided between the magnetic and the electric fields.