When we say charges are ‘positive' or ‘negative' we are speaking of
a. two intrinsically different types of charge found in nature.
b. an excess vs. a deficiency of charge.
c. charges existing vs. not existing.
d. none of the above.
a
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A sample of helium gas with an initial temperature of Ti in an insulated cylinder with initial volume Vi is suddenly and violently compressed to one-half its volume. The absolute temperature of the gas after the compression is observed to have doubled. (Note: In a quasistatic adiabatic compression of a monatomic gas, TV2/3= constant.) A suitable replacement process for this process would be
A. a slow isothermal compression from Vi to 
Vi.
B. a slow adiabatic compression from Vi to Vi.
C. Heating the gas to double its temperature followed by a slow adiabatic compression from Vi to Vi.
D. a slow adiabatic compression from Vi to Vi followed by heating to bring the temperature to 2Ti.
E. a slow adiabatic compression from Vi to Vi followed by cooling to bring the temperature to 2Ti.
F. None of the above.
What were the canals on Mars eventually found to be? How do they differ from the outflow channels and valley networks on Mars?
a. The canals were optical illusions. The outflow channels and valley networks on Mars are not as straight and organized. b. The canals were actually the outflow channels and valley networks. c. The canals were ancient constructions made by aliens. The outflow channels and valley networks are geological structures. d. The canals were cracks in the crust. They are much deeper than the outflow channels and valley networks.
A diverging lens is thicker at the center than the edges
Indicate whether the statement is true or false
Electric potential energy is measured in
1) amperes. 2) volts. 3) joules. 4) watts and electric potential is measure in 5) amperes. 6) volts. 7) joules. 8) watts