This design involves only one optical surface, a concave mirror
A) prime focus reflector
B) Newtonian reflector
C) Cassegrain reflector
D) Gregorian reflector
E) refractor
A
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A 6-kg bowling ball moving at 3 m/s collides with a 1.4-kg bowling pin at rest. How do the magnitudes of the forces exerted by the collision on each object compare?
A. The force on the pin is larger than the force on the ball. B. The force on the ball is larger than the force on the pin. C. Both objects experience the same magnitude of force. D. The collision exerts no force on the ball. E. There is no way to tell.
Einstein's equivalence principle says that
A) everyone measures the speed of light to be equivalent. B) the effects of gravity are exactly equivalent to the effects of acceleration. C) someone traveling at 0.9c will age at the same rate as someone at 0.99c. D) all people see themselves at an equivalent distance to the center of the universe.
If water at 4°C slightly decreases in temperature, the water
A) contracts. B) expands. C) neither of these
A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2 . For the next 20 s, the acceleration of the particle is -1.0 cm/s2 . What is the position of the particle at the end of this motion?
a. zero b. +3.0 m c. -1.0 m d. +2.0 m e. -3.0 m