A series of fission reactions in which subsequent reactions are initiated by the neutrons produced in the previous reactions is called a
A)
critical reaction.
B)
chain reaction.
C)
usion reaction.
D)
neutron catastrophe.
E)
chemical reaction.
B
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When we enlarge a photograph of an iron ring, the image of the hole becomes
A) smaller. B) larger. C) neither smaller nor larger.
Two wave pulses with equal positive amplitudes pass each other on a string. One is traveling toward the right and the other toward the left. At the point that they occupy the same region of space at the same time
A) constructive interference occurs. B) destructive interference occurs. C) a standing wave is produced. D) a traveling wave is produced.
The source of the sun's energy is
A) chemical reactions. B) gravitational energy. C) granola bars. D) nuclear fusion. E) nuclear fission.
An air-track cart is attached to a spring and completes one oscillation every 5.67 s in simple harmonic motion. At time t = 0.00 s the cart is released at the position x = +0.250 m. What is the position of the cart when t = 29.6 s?
A) x = 0.0461 m B) x = -0.218 m C) x = 0.218 m D) x = 0.342 m E) x = 0.210 m