You\'re using a rope to pull a sled at constant velocity across level snow,with

Question

You're using a rope to pull a sled at constant velocity across level snow,with coefficient of kinetic friction 0.050 between sled and the snow. The sled is loaded with physics books, giving a total mass of 15kg .

(I got part A, but I need the answer to part B). Thanks!

Problem 4.86

You're using a rope to pull a sled at constant velocity across level snow,with coefficient of kinetic friction 0.050 between sled and the snow. The sled is loaded with physics books, giving a total mass of 15kg .

Part A

With what force should you pull with the rope horizontal?

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

7.4 N

SubmitMy AnswersGive Up

Correct

Part B

Repeat for the rope at 30 ? above horizontal.

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

SubmitMy AnswersGive Up

Problem 4.86

You're using a rope to pull a sled at constant velocity across level snow,with coefficient of kinetic friction 0.050 between sled and the snow. The sled is loaded with physics books, giving a total mass of 15kg .

Part A

With what force should you pull with the rope horizontal?

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

7.4 N

SubmitMy AnswersGive Up

Correct

Part B

Repeat for the rope at 30 ? above horizontal.

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

SubmitMy AnswersGive Up

Explanation / Answer

sum forces in the y

N + F sin(30) - m g = 0

N = m g - F sin(30)

sum forces in the x

F cos(30) - friction = 0

F cos(30) - 0.05*(mg - F sin(30)) = 0

F cos(30) - 0.05*(15*9.81 - F sin(30)) = 0

F=8.26 N

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