When a stellar iron core collapses, large numbers of neutrinos are formed, and then:
A) they form the neutron star.
B) they are absorbed by electrons to produce positrons.
C) they are captured to form heavy elements.
D) they are captured to form light elements.
E) they immediately pass through the core and escape to space.
E
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Fusion is often called a "thermonuclear reaction" because
A) it is a nuclear reaction that consumes, or uses, more thermal energy than it creates. B) it is a process that converts thermal energy into nuclear energy. C) it is a nuclear reaction that is self-sustaining a sufficiently high temperatures. D) it produces nuclear energy. E) it is a nuclear reaction that produces more total energy than it consumes.
A soccer ball (mass = 0.43 kg) is moving at a speed of 20 m/s when it is kicked with a force of 300 N resulting in it going in the opposite direction with the same speed as before. What is the magnitude of the impulse delivered to the ball?
a. 0, because the before and after momenta cancel each other. b. 8.6 kg•m/s c. 17 kg•m/s d. 2600 kg•m/s
Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity and apparent brightness?
A) Luminosity is decreased by a factor of four and the apparent brightness is decreased by a factor of four. B) Luminosity is decreased by a factor of two and the apparent brightness is decreased by a factor of two. C) Luminosity remains the same, but the apparent brightness is decreased by a factor of two. D) Luminosity remains the same, but the apparent brightness is decreased by a factor of four. E) Luminosity is decreased by a factor of four, but the apparent brightness remains the same.
A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60° above the horizontal. What is the magnitude of the average resultant force on the ball?
a. 14 N b. 11 N c. 18 N d. 22 N e. 3.0 N