A neutron makes a better "nuclear bullet", for fissioning a nucleus, than does a proton. This is because
A) it is easy to accelerate neutrons to high speeds in nuclear accelerators.
B) the negative charge on the neutron attracts it to the nucleus.
C) protons do not feel the strong nuclear force and thus do not interact appreciably with the nucleus.
D) neutrons are so much more massive than protons.
E) unlike the proton, the neutron is not repelled by the charge on the nucleus.
E
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Intensity of Sound: A certain siren radiates sound uniformly in all directions. At a distance of 17 m from the siren, the intensity level is 49 db. How many watts of power does this siren put out? The threshold of human hearing is 1.0 × 10-12 W/m2.
Fill in the blank(s) with the appropriate word(s).
The universe as a whole is
A) curved. B) flat. C) the shape of a saddle. D) has yet to be determined, although most astrophysical data points to a flat universe.
The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-s time interval. During this same time interval, the velocity of the object changes its direction by 90°. What is the magnitude of the average total force acting on the object during this time interval?
a. 30 N b. 20 N c. 40 N d. 50 N e. 6.0 N
An Earth satellite is simply a projectile
A) freely falling around Earth. B) floating motionless in space near Earth. C) approaching Earth from outer space.