Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature.
b. Neither, because a change of state may involve release or absorption of latent heat.
c. Neither because a substance may do work during a temperature change.
d. All of the statements above are correct.
e. Only statements (a) and (b) are correct.
d
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A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A and it leads the voltage by 60°. What is the value of the resistance in this circuit?
A) 100 ? B) 150 ? C) 120 ? D) 60 ? E) 200 ?
When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
A. 48 mJ B. 27 mJ C. 37 mJ D. 19 mJ E. 10 mJ
The coefficient of static friction between the tires of a car and the street is µs = 0.58 . Of the following, what is the steepest inclination angle of a street on which a car can be parked (with wheels locked) without slipping?
a. 22.5° c. 38° b. 30° d. 45°