In order to be useful in sustaining a reaction, the neutrons in a fission reactor must be
a. released from the reactor.
b. warmed to a higher temperature.
c. accelerated.
d. decelerated.
d
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Which planet is often called our most brilliant "morning star"?
a. Venus b. Jupiter c. Mars d. Mercury e. Saturn
A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton?
What will be an ideal response?
A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball?
A) 67.9 m/s2 B) 38.7 m/s2 C) 29.3 m/s2 D) 14.8 m/s2 E) 74.2 m/s2
A 1.2-kg mass is projected from ground level with a velocity of 30 m/s at some unknown angle above the horizontal. A short time after being projected, the mass barely clears a 16-m tall fence. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass as it clears the fence?
a. 0.35 kJ b. 0.73 kJ c. 0.40 kJ d. 0.68 kJ e. 0.19 kJ