When different resistors are connected in parallel across an ideal battery, we can be certain that
A) the same current flows in each one.
B) their equivalent resistance is equal to the average of the individual resistances.
C) the power dissipated in each is the same.
D) the potential difference across each is the same.
E) their equivalent resistance is greater than the resistance of any one of the individual resistances.
D
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How does the prevailing model for activity explain the hot ejected gas seen in active galaxies?
A. It is energy released as matter is funneled into a black hole. B. It is gas evaporating from an accretion disk around a massive black hole. C. It is shot out of a black hole. D. It is material trapped between two orbiting black holes being gravitationally scattered. E. It is a rip in space-time from which Hawking radiation is released.
A proton (mass = 1.67 × 10^?27 kg, charge = 1.60 × 10^?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB ? VA
a. +15 V b. ?15 V c. ?33 V d. +33 V e. ?20 V
What do we think happened to the solar nebula after the planets formed?
a. The gas was all used up in planet formation. b. The rest of the gas gradually drifted away. c. The solar wind helped blow the gas away. d. The gas is still here; we just can’t see it.
Starship "Alpha" travels at 0.9c past an identical starship "Beta," which is at rest. Both a cabin boy on the "Alpha" and a cook on the "Beta" measure the time required for the other ship to pass by their respective windows. Who measures the longer time?
A. The cabin boy B. Both measure the same time C. The measured times cannot be compared D. The cook