Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left
b. left to right
c. in circles
d. It is impossible to tell.
B
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____________________ galaxies have a definite disk component, but contain no evidence of spiral pattern, few hot young stars, and little gas and dust
Fill in the blank(s) with correct word
Which of the following statements best describes current understanding of the eventual fate of the universe?
A) Although the accelerating expansion suggests that the universe will continue to expand forever, it is possible that future discoveries will indicate a different fate. B) The universe will continue to expand forever, because only gravity could reverse the expansion, and it is not strong enough to do so. C) The acceleration of the expansion will eventually lead to a Big Rip that will break all matter apart. D) The universe will gradually decay as it continues to expand, with protons eventually decaying and black holes ultimately evaporating, leaving the universe cold and dark.
A futuristic design for a car is to have a large solid disk-shaped flywheel within the car storing kinetic energy
The uniform flywheel has mass 370 kg with a radius of 0.500 m and can rotate up to Assuming all of this stored kinetic energy could be transferred to the linear velocity of the car, find the maximum attainable speed of the car. What will be an ideal response?
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1 100 K, Tc = 1 000 K; Engine B: Th = 550 K, Tc = 500 K; Engine C: Th = 1100 K, Tc = 500 K. Which two engines have the same thermal efficiency?
a. A and C b. B and C c. A and B d. No two have the same thermal efficiency. e. A and B and C