A 100-kg student eats a 200-Calorie doughnut. To "burn it off", he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? (1 food Calorie = 103 calories.)
a. 273
b. 623
c. 418
d. 854
e. 8 400
d
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A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m. What is the magnitude of its angular acceleration if there was no slipping?
A) 1.8 rad/s2 B) 0.90 rad/s2 C) 5.7 rad/s2 D) 11 rad/s2
Why does neutron capture work?
A) Neutrons have no repulsive barrier to overcome in combining with positively charged nuclei. B) Neutrinos, because of their low mass and high speed, easily penetrate nuclei. C) Single protons have little repulsion to heavy nuclei and easily fuse with them. D) Photodisintegration makes many alpha particles, available for capture by nuclei. E) Neutronization captures all the protons and electrons.
General Questions: A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be
A. equal to the weight of the bucket. B. greater than the weight of the bucket. C. less than the weight of the bucket.
An object will ______________ in a fluid if its average density is ______________ the density of the fluid
a. float; greater than b. float; less than c. sink; less than d. sink; equal to