100 N 225 Brian is trying to pull Julie on a sled across a flat, snowy field. Br

Question

100 N 225 Brian is trying to pull Julie on a sled across a flat, snowy field. Brian pulls on a rope attiched to the sled. His pulling force is directed forward and upward Julie's mass is 50 kg, and the sled's mass is 8 kg. If the coefficient of static friction between the sled runners and the snow is 0.10, how much force must Brian exert on the rope to start moving the sled? 16. at an angle of 30° above horizontal 30° ck and skiing straight down a 30 slope. Air resistance pushes backward or nf dynamic friction between her skis and the snow is that act gn Amy?

Explanation / Answer

Here normal N = mg - F sin 30 degree = (50+8)*9.8 - 0.5 F = 568.4 - 0.5F

F cos 30 degree = friction = uN

F*0.866 = 0.1 *(568.4 - 0.5F)

0.866F = 56.84 - 0.05F

F = 56.84/(0.866+0.05)

= 62.05 N answer

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