Chapter 3
- (p.75 prob.75) Romeo is chucking pebbles gently up to Juliet's window,
and he wants the pebbles to hit the window with only a horizontal component
of velocity. He is standing at the edge of aa rose garden 8.0m below her
window and 9.0m from the base of the wall. How fast are the pebbles going
when they hit her window?
Answer.
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(p.75 prob.79) A light plane is headed due south with a speed relative to still air of 240km/h.
after 1 hour, the pilot notices that they have covered only 180km and their
direction is not south but southeast. What is the wind velocity?
Answer.
-
(p.76 prob.87) Spymaster Tim, flying a constant 200km/h horizontally in a
low-flying helicopter, wants to drop secret documents into his contact's
open car which is traveling 150km/h on a level highway 78.0m below. At what
angle (with the horizontal) should the car be in his sights when the packet is
released.
Answer.
-
(p.76 prob.93) A projected space station consists of a circular tube that is set
rotating about its center (like a tubular bicycle tire, (Fig. 3-60). The circle
formed by the tube has a diameter of about 1.1km. What must be the rotation
speed (revolutions per day) if an effect equal to gravity at the surface of the
Earth (1.0g) is to be felt?
Answer.
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