Physics

A 525-g book is placed on a wooden plank which is at an angle of 35.0° to the horizontal. After the book is released, it is measured to slide down the plank with an acceleration of 2.56 m/s2.
(a) Calculate the coefficient of kinetic friction between the book and the plank.
(b) If the book was released from rest, calculate the work done by gravity after it has moved
down the plank a distance of 55.0 cm.
(c) If the book was released from rest, calculate the work done by friction after it has moved
down the plank a distance of 55.0 cm.

  1. 0
  2. 0
  3. 15
asked by Eskimo
  1. M*g = 0.525 * 9.8 = 5.15 N. = Wt. of book.

    Fp = 5.15 * sin35 = 2.95 N. = Force in-parallel with plank.
    Fn = 5.15*Cos35 = 4.21 N. = Normal force or force perpendicular to plank.

    a. Fp - Fk = M*a.
    2.95 - Fk = 0.525 * 2.56,
    Fk = 1.61 N. = Force of kinetic friction.
    Fk = u*Fn = 1.61.
    u * 4.21 = 1.61,
    u = ?

    b. W = Mg * d = 0.525 * 0.55 =

    c. W = Fk * d =

    1. 0
    2. 0
    posted by Henry

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 525-g book is placed on a wooden plank which is at an angle of 35.0° to the horizontal. After the book is released, it is measured to slide down the plank with an acceleration of 2.56 m/s2. (a) Calculate the coefficient of

    asked by Anonymous on October 10, 2018
  2. physics

    A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which

    asked by jill on September 24, 2014
  3. science(physics)

    A bullet of mass 100g moving with20m/sec .Strikes a wooden plank and peretrates up to 20cm.Calculate the resistance offered by the wooden plank.

    asked by Raj on July 27, 2016
  4. Physics

    A wooden plank is inclined at and angle of 23 degrees above the horizontal. A 2.0 kg box attached to a rope is is pulled up the incline. The coefficient of kinetic friction between the box and the wooden plank is 0.15. What does

    asked by Eunice on February 6, 2012
  5. trigonometry

    to unload hollow blocks from the cargo truck a wooden plank whose end rests against the truck's platform 1.5 meters above the ground is used. if it is inclined 37%49 with the ground, how long is the wooden plank?

    asked by karEn on August 15, 2014
  6. physics

    1 A block of mass mb sits atop a at wooden plank of mass mp on a plane inclined an angle theta with respect to thehorizontal. The two are supported near the bottom of the plane by a spring of spring constant k that is in

    asked by lala on October 19, 2011
  7. physics

    a boy of mass 'm' stands on one end of a wooden plank of length L and mass M. The plank is floating on water. If the boy walks from one end of the plank to the other end at a constant speed the resulting displacement of the plank

    asked by shoaib on June 25, 2010
  8. Physics

    A wooden plank with length L = 7.5 m and mass M = 104 kg is centered on a granite cube with side S = 2.0 m. A person of mass m = 64 kg begins walking from the center of the plank outward, as shown in the figure. How far from the

    asked by Annabelle on June 23, 2012
  9. science

    A bullet having a mass of 10g and moving with a speed of 1.5m/s penetrates a thick wooden plank of mass 90g. The plank was initially at rest. The bullet gets embedded in the plank and both moves together. Determine their velocity

    asked by snehal raja acharya on July 16, 2017
  10. PHYSICS Please Help

    A box rests on a plank that is inclined to the horizontal. As the angle between the plank and the horizontal increases, does the component of the weight of the box parallel to the plank increase, decrease, or remain the same?

    asked by Suzanne on October 17, 2006

More Similar Questions