Which of the following is the rate at which energy is transferred?
a. potential energy
b. kinetic energy
c. mechanical energy
d. power
Ans: d. power
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Suppose that an astronomer discovers an active galaxy, and that the intensity of the radiation from the galactic nucleus fluctuates in intervals of 8 minutes. Based on her observations, the astronomer should infer that the active nucleus of this galaxy is about ________ in diameter. (Hint: It takes light about 8 minutes to reach Earth from the Sun.)
A. 8 AU B. 8 light-years C. 1 AU D. 1 Mpc
An ideal solenoid is 18.5 cm long, has a circular cross-section 2.20 cm in diameter, and contains 545 equally spaced thin windings
This solenoid is connected in a series circuit with an open switch, a 15.0-? resistor, and a battery of internal resistance 5.00 ? and open-circuit terminal voltage of 25.0 V. (?0 = 4? × 10-7 T ? m/A) (a) What is the maximum amount of energy that the solenoid will store after closing the switch? (b) How long after closing the switch will it take for the stored energy in the solenoid to reach one-half of its maximum value? What will be an ideal response?
When you place a sealed can of air on a hot stove, air in the can undergoes an increase in
A) thermal energy. B) temperature. C) pressure. D) all of the above E) none of the above
Schwarzschild showed how the _______________ of the event horizon depends only on the mass of the black hole
Fill in the blank(s) with correct word