midterm practice exam 1 solutions

# Physics for Scientists and Engineers (3rd Edition)

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PHY131 Midterm-I Practice Exam Solutions 1) The punter on a football team tries to kick a football so that it stays in the air a long time, the so-called “hang time”. The ball is kicked with an initial velocity of 25.0 m/s at an angle of 60 o relative to the ground. a) What is the “hang time”? b) What is the distance the ball is in air before it hits the ground again? a) hang time: s g v g v t gt v gt t v t y y y y 42 . 4 sin 2 2 2 1 0 2 1 ) ( 0 0 0 2 0 = = = = = = θ y x θ v 0 b) distance in air: m g v g v v t v t x x 2 . 55 cos sin 2 sin 2 cos ) ( 2 0 0 0 0 = = = = 2) A Ferris wheel with radius R = 14.0 m is turning counter clockwise about a horizontal axis through its center. The speed of the seats on the rim is constant at 7.00 m/s. An 80-kg passenger is sitting on a bathroom scale. a) What will the scale read at the highest point of the circular motion? b) What will it read at the lowest point? a) at highest point:

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midterm practice exam 1 solutions - PHY131 Midterm-I...

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