The temperature of a quantity of an ideal gas is
A. one measure of its ability to transfer thermal energy to another body.
B. proportional to the average molecular kinetic energy of the molecules.
C. proportional to the internal energy of the gas.
D. correctly described by all the statements above.
E. correctly described only by (a) and (b) above.
Answer: D
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Bob, of mass m, drops from a tree limb at the same time that Esther, also of mass m, begins her descent down a frictionless slide. If they both start at the same height above the ground, which of the following is true about their kinetic energies as they reach the ground?
1.Bob's kinetic energy is greater than Esther's. 2.Esther’s kinetic energy is greater than Bob's. 3.They have the same kinetic energy. 4.The answer depends on the shape of the slide.
The energy source for a generator may be
A) a waterfall. B) steam from a turbine. C) wind. D) any of these E) none of the above
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 21.0 cm from the mirror, what is its focal length?
a. 14.0 cm b. 42.0 cm c. 10.5 cm d. 42.0 cm e. 21.0 cm
What did Galileo discover when looking at the Sun with his telescope, and how did this support Copernicus?
What will be an ideal response?