The mass ratio of a rocket is defined to be the
A) mass of the empty rocket without fuel divided by the mass of the payload
B) mass of the fully fueled rocket divided by the mass of the rocket after the fuel is burned
C) mass of the rocket after the fuel is burned divided by the mass of the fully fueled rocket
D) mass of the fuel in the rocket divided by the mass of the rocket payload
B
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Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is
A) 100 N. B) 1000 N. C) 10,000 N. D) more than 10,000 N
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A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?
A) 30° B) 45° C) 50° D) 75° E) 90°