science

A steel block weighing 12N is pulled up an incline plane 20° above the horizontal by a constant force of 7.35 N which makes an angle of 10° above the inclined plane. The block stars from rest and is pulled 2.0m along the inclined plane. the coefficient of friction between the block and inclined plane is 0.20.find the increase in kinetic energy of the block?

  1. 👍
  2. 👎
  3. 👁
  1. finding pulling force: 7.35cos10 up the plane
    finding pulling normal force: 7.35sin10 upwards
    finding total normal force; 12sin20-7.35sin10
    finding friction= mu*(above normal force)
    work done by pulling: 7.35cos10*2
    work absorbed by friction: mu(above normal force)*2
    KE= workdonebypulling-workabsorbedby friction.

    1. 👍
    2. 👎
  2. - gain in potential energy due to going up

    1. 👍
    2. 👎
  3. damon is correct. change this to read...
    finding pulling force: 7.35cos10 up the plane
    finding pulling normal force: 7.35sin10 upwards
    finding total normal force; 12sin20-7.35sin10
    finding friction= mu*(above normal force)
    work done by pulling: 7.35cos10*2
    work absorbed by friction: mu(above normal force)*2
    gain in PE: 12*2*sin20
    KE= workdonebypulling-workabsorbedby friction-gain in PE

    1. 👍
    2. 👎
    👤
    bobpursley
  4. Fp = 12*sin20 = 4.1 N. = Force parallel with incline,
    Fn = 12*Cos20 - 7.35*sin10 = 10 N. = Normal force,
    Fk = u * Fn = 0.2 * 10 = 2 N.,
    F = 7.35*Cos10 - Fp - Fk = 7.24 - 4.1 - 2 = 1.14 N. = Net force,
    Work = F * d = 1.14 * 2 = 2.28 J. = Increase in KE.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Engineering science

    2. A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s. a. How large is the coefficient of kinetic friction if the plane makes an angle of 25 degrees with the horizontal? b. If the angle of

  2. Physics

    The block shown in (Figure 1) has mass m = 7.0 kg and lies on a fixed smooth frictionless plane tilted at an angle θ = 22.0 ∘ to the horizontal. If the block starts from rest 15.2 m up the plane from its base, what will be the

  3. physics

    Consider a block on an incline plane. The coefficients of static and kinetic friction between the block and the incline are µs = 0.353 and µk = 0.31. Calculate the critical angle θc, where the block just begins to slide. Answer

  4. physics

    A 20. kg block is placed at the top of a 10. meter-long inclined plane. The block starts from rest and slides without friction down the length of the incline. (A diagram shows a height of 5.0 m, the 10. m length of

  1. Physics

    A block of weight = 25.0 N sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude = 14.0 N, applied parallel to the incline, is just

  2. 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

  3. Physics

    A)A block rests on a horizontal frictionless surface. A string is attached to the block, and is pulled with a force of 60.0 N at an angle θ above the horizontal. After the block is pulled through a distance of 2.00 m, its speed

  4. Physics

    A 50 kg crate is initially at rest on a plane inclined at an angle of 30 degrees to the horizontal. A man then pulls the crate up the incline via a rope that is parallel to the inclined plane. The tension that the man imparts to

  1. Physics

    A block slides down a frictionless plane having an inclination of θ = 13.2°. The block starts from rest at the top, and the length of the incline is 1.70 m. -> Find the acceleration of the block. (m/s2 down the incline) -> Find

  2. Physics

    You place a box weighing 353.8N on an incline plane that makes a 42.5 degree andle with the horizontal. Compute the component of the gravitational force acting down the incline plae. Answer in Units of N

  3. physics

    An block of mass m , starting from rest, slides down an inclined plane of length L and angle θ with respect to the horizontal. The coefficient of kinetic friction between the block and the inclined surface is μ1 . At the bottom

  4. physics

    A 2.00 kg block is held in equilibrium on an incline of angle θ = 75° by a horizontal force applied in the direction shown in the figure below. If the coefficient of static friction between block and incline is μs = 0.300,

You can view more similar questions or ask a new question.