Which of these did Count Rumford demonstrate?
a. That heat was only generated by fire, light, and sunshine.
b. That caloric, or heat fluid, is a gas.
c. That heat is a substance found in fire that is available only in limited amounts in every object.
d. That heat can be generated in any amount wanted and was therefore not a material substance.
e. That heat is a form of energy.
d
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Charge is distributed uniformly on the surface of a spherical nonconducting shell. A point particle with charge q is inside. The electrical force on the particle q is least when:
A) it is near the inside surface of the shell B) it is at the center of the shell C) it is halfway between the shell center and the inside surface D) it is near, but not at, the center of the shell E) all of the above (the force is zero everywhere inside)
A fish weighing 16 N is weighed using two spring scales, each of negligible weight, as shown in the figure. What will be the readings of the scales?
A) The bottom scale will read 16 N, and the top scale will read zero. B) Each scale will read 16 N. C) The top scale will read 16 N, and the bottom scale will read zero. D) The scales will have different readings, but the sum of the two readings will be 16 N. E) Each scale will read 8 N.
Which of the following are true waves, as the word is defined in physics?
A) a water wave coming into a beach, after it has broken B) water rushing downstream C) Both of the above. D) a sports wave [called "the wave"] at a sports arena E) None of the above.
The greenhouse effect is the result of the atmosphere's _______ of _______ radiation emitted by the Earth.
What will be an ideal response?