Homework Help: physics

Posted by unknown on Monday, June 13, 2011 at 4:14pm.

A sled with mass 20 kg is given a shove up a frictionless incline which makes an angle of 28 degrees with the horizontal. eventually the sled comes to rest at height of 1.35 m above where it started. a)calculate its initial speed. b)find the work done by the weight of the sled.

physics - Henry, Tuesday, June 14, 2011 at 3:23pm
Vf^2 = = Vo^2 + 2gd = 0,

a. Vo^2 - 2*9.8 * 1.35 = 0,
Vo^2 - 26.46 = 0,
Vo^2 = 26.46,
Vo = 5.14m/s.

b. Fs = mg = 20kg * 9.8N/kg = 196N. =
Force of the sled.

196 @ 28deg.

Fp=196sin28 = 92N. = Force of the sled acting parallel to plane downward.

d=1.35m / sin28 = 2.88m = The distance traveled up the plane.

W = Fp*d = 92 * 2.88 = 265 Joules.

Answer this Question

Related Questions

Physics - In a circus performance, a monkey on a sled is given an initial speed ...
Physics - In a circus performance, a monkey on a sled is given an initial speed ...
Physics - A mass of 18 kg is being pushed up a frictionless incline with a ...
Physics - A mass of 18 kg is being pushed up a frictionless incline with a ...
Physics - A mass of 18 kg is being pushed up a frictionless incline with a ...
physics - In a circus performance, a monkey on a sled is given an initial speed ...
physics - A sled is initially given a shove up a frictionless 32.0 incline. It ...
Physics - A sled is initially given a shove up a frictionless 24.0° incline...
Physics - A sled is initially given a shove up a frictionless 24.0° incline...
Physics 1 - A mass of 11 kg is being pushed up a frictionless incline with a ...

For Further Reading

First Name:
School Subject:
Answer: