When an electron goes from the ground state to an excited state,
a. energy is emitted.
b. a photon is absorbed.
c. a photon is emitted.
d. none of these occur.
b
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Show that the friction factor in the Darcy-Wiesbach equation for laminar flow is 64/ReD.
What will be an ideal response?
A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0
and the other temperature is 25.0
The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2 . If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal?
A. 69.2 W/m•
B. 58.2 W/m•
C. 50.4 W/m•
D. 46.3 W/m•
E. 44.2 W/m•
Why is the Moon heavily cratered but Earth is not?
What will be an ideal response?
After a skydiver reaches terminal velocity,
a. the force of gravity no longer performs work on the skydiver. b. work performed by the force of gravity is converted into gravitational potential energy. c. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. d. gravitational potential energy is converted into thermal energy. e. thermal energy is converted into gravitational potential energy.