1. Knight P10.7 What height does a frictionless playground slide need so that a 35 kg child reaches the bottom at a speed of 4.5 m/s?

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Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 8PE: Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0°...
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In every problem you can assume conservation of total
mechanical energy.
1. Knight P10.7 What height does a frictionless
playground slide need so that a 35 kg child reaches
the bottom at a speed of 4.5 m/s?
2. Knight P10.26 In the potential energy graph
does 100 particle
Transcribed Image Text:Questions In every problem you can assume conservation of total mechanical energy. 1. Knight P10.7 What height does a frictionless playground slide need so that a 35 kg child reaches the bottom at a speed of 4.5 m/s? 2. Knight P10.26 In the potential energy graph does 100 particle
Useful information
gravitational acceleration g = 9.8 m/s²
General energy theorem
Ko + Uo+Wext = Kƒ + Uƒ + AEth
Isolated and dissipationless system
Kinetic energy
Spring relations
Gravity relations
Ko + Uo= Kf + Ug
KE:
=
-mv²
Fsp=-kAx
1
Usp =
k(Aa)²
Fg = -mg
Ug = mgAy
Transcribed Image Text:Useful information gravitational acceleration g = 9.8 m/s² General energy theorem Ko + Uo+Wext = Kƒ + Uƒ + AEth Isolated and dissipationless system Kinetic energy Spring relations Gravity relations Ko + Uo= Kf + Ug KE: = -mv² Fsp=-kAx 1 Usp = k(Aa)² Fg = -mg Ug = mgAy
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