# physics

An 8kg block starts from rest from the top of a plane, inclined at 40o with respect to the horizontal, and slides down at a
constant acceleration. If the coefficient of kinetic friction between the block the plane is 0.35 determine how far the
block travels in 3s.
2013/

1. 👍 0
2. 👎 0
3. 👁 126
1. M*g = 8 * 9.8 = 78.4 N. = Wt. of block.

Fp = 78.4*sin40 = 50.4 N. = Force parallel to the incline.

Fn = 78.4*cos40 = 60.1 N. = Normal force

Fk = u*Fn = 0.35 * 60.1 = 21 N. = Force
of friction.

a = (Fp-Fk)/M = (50.4-21)/8 = 3.68 m/s^2

d = 0.5a*t^2 = 0.5*3.68*3^2 = 16.54 m.

1. 👍 0
2. 👎 0
posted by Henry

## Similar Questions

1. ### physics

An 8kg block starts from rest from the top of a plane, inclined at 40o with respect to the horizontal, and slides down at a constant acceleration. If the coefficient of kinetic friction between the block the plane is 0.35

asked by Anonymous on May 18, 2015
2. ### physics

A 2.0-kg wooden block slides down an inclined plane 1.0 m high and 3.0 m long. The block starts from rest at the top of the plane. The coefficient of kinetic friction between the block and plane is 0.35. What is the speed of the

asked by angel on August 1, 2011
3. ### cary collage

"A 2.5-kg block slides down a 25 degree inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity reaches 0.65 m/s. The length of the incline is 1.6m. a) What is the acceleration

asked by sahan on September 27, 2010
4. ### physics

A 2.5-kg block slides down a 17.0° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom its velocity reaches 0.70 m/s. The length of the incline is 1.7 m. What is the acceleration of the

asked by Eddie on November 1, 2011
5. ### physics

another question: the 20 kg block is at the top of a 10 m long inclined plane. The block starts from rest and slides without friction down the length of the incline. The block is 5 m high. 1) Determine the gravitational potential

asked by Nabil on March 20, 2011
6. ### Math/Physics2

The block has mass m=8.5 kg and lies on a fixed smooth frictionless plane tilted at an angle theta=20.0 degrees to the horizontal. Determine the acceleration of the block as it slides down the plane. If the block starts from rest

asked by Era on September 23, 2009
7. ### Physics

A 2.5 kg block sits on an inclined plane with a 30 degree inclination. A light cord attached to the block passes up over a light frictionless pulley at the top of the plane and is tied to a second 2.5 kg mass freely hanging

asked by Margaret on October 11, 2013
8. ### physics

Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The inclined plane is inclined at an angle of 37

asked by Haff on November 19, 2013