The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process?
a. conduction
c. convection
b. radiation
d. vaporization
B
You might also like to view...
Addition by Components: Three ropes are tied in a knot as shown in the figure. One student pulls on rope A with 1.0 pound of force, and another student pulls on rope B with 7.0 pounds of force. How hard and in what direction must you pull on rope C to balance the first two pulls? Give the direction by specifying the angle (clockwise or counterclockwise) of the pull with the direction of rope A.
What will be an ideal response?
Define an elastic collision in terms of conservation of momentum and energy
What will be an ideal response?
Let "m" represent the mass of an electron, and "c" represent the speed of light. In order to create an electron-positron pair, we must start with a photon whose energy is
A) at least mc2. B) at least 2mc2. C) at least 4mc2. D) any value greater than zero. E) Actually it is impossible to create such pairs from photons.
A solenoid is stretched uniformly to a greater length. If the pre-stretch magnetic field was B, and the length increased 50%, what is the new value for the internal magnetic field in terms of B assuming the current does not change?
1. B/2 2. B 3. 3B/2 4. 2B/3