The net force acting on a 4.92-kg object is given by Fx = (10 ? x) N, where Fx is in newtons and x is in meters. How much work is done on the object as it moves from x = 0 to x = 12.4 m?
a. 61.0 J
b. 12.4 J
c. 47.1 J
d. 23.6 J
e. 35.3 J
c
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A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg?m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s
In fission bombs, a certain "critical mass" is needed because
A) the fissionable material will not reach a sufficiently high temperature unless this much material is present. B) if the mass is too small, too many neutrons pass through the uranium and out the sides without hitting a nucleus. C) too small an amount of uranium will not hold together throughout the reaction, and thus the uranium falls apart and the reaction goes out before it is completed. D) it is impossible to fission a uranium nucleus unless it is near a large number of other uranium nuclei. E) for smaller masses the pressure is so low that neutrons move too slowly through the uranium to sustain a chain reaction.
The temperature of boiling water is
A) 100°C. B) 212°F. C) both of these
Rays with the shortest wavelengths have the
A) highest frequencies and energies. B) lowest frequencies and energies. C) lowest frequencies but highest energies.