HW_ANS
Friday, October 15, 2010
8:00 AM
1. A ball is fired from the ground with an initial velocity of 1700 m/s at an angle of 55.0o to the horizontal.
Find the ball’s horizontal range and the amount of time the ball is in the air. (2.77 X 105 m, 284 s)
1. Emanuel Zacchini, the famous human cannonball of the Ringling Bros. and Barnum & Bailey Circus, was
fired out of a cannon with a velocity of 24 m/s at an angle of 40 degrees. If he landed 56.6 m away, how
long was he in the air? (3.08s)
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2. Superman is able to “leap tall buildings in a single bound.” How high a building could Superman jump
over if he were to leave the ground with a velocity of 60 m/s, 75 degrees? (171 m)
3. A rocket is fired at an angle of 35 degrees with a velocity of 100 m/s. How far does the rocket travel
before hitting the ground? (957.7 m)
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Challenge Problems:
1. A golfer can hit a golf ball horizontally a distance of 301.5 m, what maximum height the ball reach if it
were hit at an angle of 25o? (35.8 m)
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2. A daredevil jumps a canyon 12 m wide. To do so, she drives a car up a 15o incline. At what minimum
velocity must she achieve to clear the canyon? (15.7 m/s)
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