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Chapter 3 | Two-Dimensional Kinematics
Figure 3.65 An ice hockey player moving across the rink must shoot
backward to give the puck a velocity toward the goal.
68. Unreasonable Results Suppose you wish to shoot
supplies straight up to astronauts in an orbit 36,000 km above
the surface of the Earth. (a) At what velocity must the
supplies be launched? (b) What is unreasonable about this
velocity? (c) Is there a problem with the relative velocity
between the supplies and the astronauts when the supplies
reach their maximum height? (d) Is the premise unreasonable
or is the available equation inapplicable? Explain your
69. Unreasonable Results A commercial airplane has an air
speed of 280 m/s due east and flies with a strong tailwind. It
travels 3000 km in a direction 5º south of east in 1.50 h. (a)
What was the velocity of the plane relative to the ground? (b)
Calculate the magnitude and direction of the tailwind’s
velocity. (c) What is unreasonable about both of these
velocities? (d) Which premise is unreasonable?
70. Construct Your Own Problem Consider an airplane
headed for a runway in a cross wind. Construct a problem in
which you calculate the angle the airplane must fly relative to
the air mass in order to have a velocity parallel to the runway.
Among the things to consider are the direction of the runway,
the wind speed and direction (its velocity) and the speed of
the plane relative to the air mass. Also calculate the speed of
the airplane relative to the ground. Discuss any last minute
maneuvers the pilot might have to perform in order for the
plane to land with its wheels pointing straight down the