P2207_fall10_lecture4

# P2207_fall10_lecture4 - Can a Boing 767 glide i.e fly...

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Can a Boing 767 glide, i.e. fly without engine power? A. Yes B. Probably, but nobody has tried this yet C. No way
Today: 1-D motion: general case Checking Answers Order of magnitude Number of significant figures Units Why units matter: Air Canada Flight 143 Dimensional analysis

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A car starts from rest at t =0 and accelerates at 3 m/s 2 for 10 s. It then drives at constant speed for another 10 s. How far does the car travel? distance car travels = ? A. 150 m B. 300 m C. 450 m D. 600 m
An object starts with v =0 and x =0 at t =0. If a ( t ) is as shown below, what is x ( t =10 s)? a (m/s 2 ) -2 t (s) 4 6 8 10 2 2 x ( t =10 s) =? A. 0 m B. 4 m C. 8 m D. 16 m E. 24 m 0

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Some Order of Magnitudes: Speeds: (m/s) 10 8 light, electromagnetic waves, electrons in particle accelerators 10 7 electrons in TV picture tubes 10 6 comets, stars 10 5 planet orbital speeds around the Sun 10 4 satellite orbital speed around the Earth 10 3 supersonic aircraft, bullets 10 2
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P2207_fall10_lecture4 - Can a Boing 767 glide i.e fly...

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