P2207_fall10_lecture3 - independent of their mass...

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Today: 1-D motion with constant acceleration (a=const) – Free fall – How high is the Suspension Bridge above Fall Creek Gorge? – Galileo – Kitchen faucets Proportional reasoning
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Cornell Suspension Bridge spanning Fall Creek How high is the bridge above the gorge floor? h = ? A. 15 m (50 feet) B. 30 m (100 feet) C. 45 m (150 feet) D. 60 m (200 feet) E. 65 m (250 feet)
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Cornell Suspension Bridge spanning Fall Creek
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The time for a rock to drop from the Suspension Bridge to the floor of Fall Creek Gorge is measured to be ~3 s. What is the rock's speed when it hits the ground? speed = ? A. 10 m/s B. 20 m/s C. 30 m/s D. 40 m/s E. 50 m/s
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The time for a rock to drop from the Suspension Bridge to the floor of Fall Creek Gorge is measured to be ~3 s. How high is the bridge above the gorge floor? h = ? A. 30 m B. 45 m C. 60 m D. 75 m E. 90 m
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Galileo is said to have dropped balls of different masses from the Leaning Tower of Pisa to demonstrate that their time of descent was
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Unformatted text preview: independent of their mass (excluding the effect of air resistance). Kitchen Faucets : h = height of faucet outlet above sink Assume v water at faucet outlet is ~0, and ~same for all faucets ( same flow rate). Then v water = when it reaches the sink, so that v water at sink. gh 2 h v water Standard faucet: Gooseneck faucet: h=15 cm (~6 inches) h=30 cm (~12 inches) - At level of sink, more splashing! h 2 , , std goose std water goose water h h v v Suppose that the height of the Suspension Bridge were doubled. By what multiplicative factor would the time for the rock to fall change? t (2h) / t (h) = ? A. 1/ 2 B. 1 C. 2 D. 2 E. 4 Suppose that the Suspension Bridge and gorge were transported to the Moon, where the acceleration due to gravity is 1/6 that on Earth . By what multiplicative factor would the time for a rock to fall to the bottom of the gorge change? t (Moon) / t (Earth) =? A. 1/6 B. 1/ 6 C. 1 D. 6 E. 6...
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This note was uploaded on 10/27/2010 for the course PHYS 2207 at Cornell University (Engineering School).

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P2207_fall10_lecture3 - independent of their mass...

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