A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball?
a. maintains the same velocity as before
b. has one half its initial velocity
c. comes to rest
d. moves in the opposite direction
c
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The magnetic field in a cyclotron is 0.50 T. What is the radius of the vacuum chamber for a maximum proton velocity of 
A. 0.11 m B. 1.2 m C. 0.21 m D. 0.013 m
Strong winds, heavy rains, storm surges
A. Waterspout |
B. Tropical Cyclones |
C. Tornado |
D. Lightning |
E. Great Red Spot |
F. Dust Devil |
A photon whose wavelength is = 5.0 × 10^?11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^?11 m b. 4.5 × 10^?11 m c. 5.5 × 10^?11 m d. 6.0 × 10^?11 m e. 6.5 × 10^?11 m
In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times before about 380,000 years after the Big Bang. Why?
A) Before that time, the universe was too crowded with stars. B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. C) Before that time, the universe was dark so there was no light to illuminate anything. D) 380,000 years after the Big Bang marks the time when stars were first born, producing the light by which we can see the universe.