A suitcase is sitting on a horizontal conveyor belt, which is moving at speed v. The work done by the frictional force on the suitcase is
a. positive
b. negative.
c. zero.
d. impossible to determine without knowing the mass of the suitcase.
a
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A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion
You live in a Universe where matter dominates significantly over antimatter
a. True b. False Indicate whether the statement is true or false
Discuss the problems involved in achieving controlled fusion as a source of energy
What will be an ideal response?
A bicycle is traveling north at 5.0 m/s. The mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radius of 20 cm. What are the magnitude and direction of the angular momentum of the wheel about its axle?
A) 2.0 kg • m2/s towards the west B) 5.0 kg • m2/s vertically upwards C) 2.0 kg • m2/s towards the east D) 5.0 kg • m2/s towards the east E) 5.0 kg • m2/s towards the west