Problem 10.38 A hockey puck is given an initial speed of 4.2 m/s. Part A If the

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Problem 10.38

A hockey puck is given an initial speed of 4.2 m/s.

Part A

If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest? Solve this problem using conservation of energy.

Express your answer to two significant figures and include the appropriate units.

Problem 10.31

A car is parked at the top of a 60 m -high hill. It slips out of gear and rolls down the hill.

Part A

How fast will it be going at the bottom? (Ignore friction.)

Express your answer to two significant figures and include the appropriate units.

Problem 10.45

Part A

How much work must you do to push a 12 kg block of steel across a steel table at a steady speed of 1.3 m/s for 7.4 s ? The coefficient of kinetic friction for steel on steel is 0.60.

Express your answer using two significant figures.

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Part B

What is your power output while doing so?

Express your answer using two significant figures.

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Problem 10.49

An elite Tour de France cyclist can maintain an output power of 420 W during a sustained climb.

Part A

At this output power, how long would it take an 86 kg cyclist (including the mass of his bike) to climb the famed 1100-m-high Alpe d'Huez mountain stage? Neglect any friction.

Express your answer using two significant figures.

Problem 10.38

A hockey puck is given an initial speed of 4.2 m/s.

Part A

If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest? Solve this problem using conservation of energy.

Express your answer to two significant figures and include the appropriate units.

d =

Problem 10.31

A car is parked at the top of a 60 m -high hill. It slips out of gear and rolls down the hill.

Part A

How fast will it be going at the bottom? (Ignore friction.)

Express your answer to two significant figures and include the appropriate units.

v =

Problem 10.45

Part A

How much work must you do to push a 12 kg block of steel across a steel table at a steady speed of 1.3 m/s for 7.4 s ? The coefficient of kinetic friction for steel on steel is 0.60.

Express your answer using two significant figures.

Wpush =   J  

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Part B

What is your power output while doing so?

Express your answer using two significant figures.

P =   W  

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Problem 10.49

An elite Tour de France cyclist can maintain an output power of 420 W during a sustained climb.

Part A

At this output power, how long would it take an 86 kg cyclist (including the mass of his bike) to climb the famed 1100-m-high Alpe d'Huez mountain stage? Neglect any friction.

Express your answer using two significant figures.

t =   min  

Explanation / Answer

10.38) W = F x d = mu m g x d

Initial KE = 1/2 m v2 = 0.5 * m * 4.22

mu m g d = 0.5 * m * 4.22

d = 0.5 * 4.22 / (0.05 * 9.81)]

d = 17.98 m

-------------------------------------------------

10.49) Work done = m g h = 86 * 9.8 * 1100

Power = work/time

time = work/power

= 86 * 9.8 * 1100 / 420 = 2207 s

= 36.79 minutes

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