Please help with this physics dog sled problem? ):
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Please help with this physics dog sled problem? ):

[From: ] [author: ] [Date: 11-12-11] [Hit: ]
The traces are making an upward angle of 30 degrees to the horizontal. The traces had a tension of 500 N. They break and the sled comes to rest. How long did this take?The answer to number 2 is 1.62 seconds,......
1. A dog is pulling a sled mass 200 kg at a steady speed of 4 m/s over ice with a
coefficient of friction of 0.3. The traces are making an upward angle of 30 degrees to the horizontal. The traces had a tension of 500 N. They break and the sled comes to rest. How long did this take?

2. A dog is pulling a sled mass 200 kg at a steady speed of 4 m/s over ice with a coefficient of friction (not given). The traces are making an upward angle of 30 degrees to the horizontal. The traces had a tension of 500 N. They break and the sled comes to rest. How long did this take?

The answer to number 2 is 1.62 seconds, but I really want to understand where that number came from. Thank you!

-
1)
a = µ*g = .3*9.8 = 2.94 m/s²
t = v/a = 4/2.94 = 1.36 sec

2)
µ = Ff/Fn = TcosΘ/m*g = 500*cos30°/(200*9.8) = .221
a = µ*g = 2.166 m/s²
t = v/a = 4/2.165 = 1.85 sec

Your answer is wrong
1
keywords: with,sled,this,Please,dog,problem,physics,help,Please help with this physics dog sled problem? ):
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