chapter 2 physics notes

# A above b below at 1511 dennis and carmen dennis and

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a) Above b) Below At

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1/5/11 DENNIS AND CARMEN Dennis and Carmen are standing on the edge of a cliff. Dennis throws a basketball vertically upward, and at the same time Carmen throws a basketball vertically downward with the same initial speed. You are standing below the cliff observing this strange behavior. Whose ball is moving fastest when it hits the ground? a) Dennis’s ball b) Carmen’s ball c) Same
1/5/11 DENNIS AND CARMEN Dennis and Carmen are standing on the edge of a cliff. Dennis throws a basketball vertically upward, and at the same time Carmen throws a basketball vertically downward with the same initial speed. You are standing below the cliff observing this strange behavior. Whose ball hits the ground at the base of the cliff first? a) Dennis’s ball b) Carmen’s ball c) Same

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1/5/11 PROBLEM The pilot of a hovering helicopter drops a lead brick from a height of 1000 m . How long does it take to reach the ground and how fast is it moving when it gets there? (neglect air resistance) -Need to know: t v(t) -Given: -Acceleration?? ° a = -g = -9.8 m/s2
1/5/11 PROBLEM -First choose coordinate system. 1Origin and y-direction. yi = 1000 m, yf = 0 m -Next write down position equation: -Realize that vi = 0.

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1/5/11 PROBLEM -Solve for time t when yf = 0 given that yi = 1000 m. -Recall -Solve for vf
1/5/11 ROCKET A test rocket is fired vertically upwards from a well. A catapult gives an initial speed of 80 m/s at ground leve. Its engines then fire and it accelerates upward at 4 m/ss until it reaches an altitude of 1000 m. At that points its engines fail and the rocket goes into free fall. a) How long is the rocket in motion before it reaches the ground? b) What is its maximum altitude? c) What is its velocity just before it collides with the earth?
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