A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity. If the pigeon is 76.0 m below the initial height of the falcon, how long does it take the falcon to intercept the pigeon?
What will be an ideal response?
3.94 s
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Fluid Flow: Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 32 m/s, what is its speed in this smaller section if the water behaves like an ideal incompressible fluid?
A. 43 m/s B. 37 m/s C. 28 m/s D. 24 m/s
Gravitational Potential Energy: A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A. one-fourth as much. B. one-half as much. C. twice as much. D. four times as much. E. the same.
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero. B) the same as before. C) small, but noticeable.
The sky is blue because air molecules in the sky act as tiny
A) mirrors which reflect only blue light. B) optical tuning forks that scatter blue light. C) sources of white light. D) prisms. E) none of the above