A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 N s.
b. 19.6 N s.
c. 29.4 N s.
d. 58.8 N s.
e. 118 N s.
d
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The vertical flight of a helicopter is controlled by ____________.
A. collective pitch changes B. torque and directional control C. angle of attack. D. relative position of the blades during rotation
A runaway railroad car, with mass 45.0 × 10^4 kg, coasts across a level track at 3.80 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 3.80 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 1.31 m b. 1.85 m c. 0.925 m d. 2.10 m e. 2.62 m
What is the MOST important role that carbohydrates play in living organisms on Earth?
A) long-term energy storage and cell structure B) information storage C) basic functioning of living organisms D) short-term energy storage
Two particles collide, one of them initially being at rest. Is it possible for both particles to be at rest after the collision?
a. If the collision is perfectly inelastic, then this happens. b. If the collision is elastic, then this happens. c. This can happen sometimes if the more massive particle was at rest. d. No.