Hello chris. Please take a look at the question po...

Hello chris. Please take a look at the question postedpreviously by me. I added a comment and please consider it.
Ahorizontal force Fa of magnitude 20 N is applied to a 3.0 kgpsychology book as the book slides a distance d=0.500 m up africtionless ramp at angle= 30. a) during the displacement what isthe net work done on the book by Fa, the gravitational force on thebook, and the normal force on the book? b) if the book has zerokinetic energy at the start of the displacement what is its speedat the end of the displacement?

Help is greatly appreciated

Answers ( 1 )

  1. kayla patel
    kayla patel
    Ahorizontal force (Fa) = 20 N
    Mass of psychology book ( m ) = 3.0 kg
    slides - distance (d) = 0.500 m up
    Inclination ( q)= 300
    Let the net acting force be ' F ' in up-warddirection
    a)
    Apply, Newton's 2nd Law of motion :

                (Fa)Cos300  - mgSin300 = F
    or,                    F = 2.6 N

    The net work done on the book is given as
                         W = F * d
    or,                      = 1.30 J
    b)
    if the book has zero kinetic energy at the start of thedisplacement, Let its speed at the end of the displacement be' vf '
                      Change in kinetic-energy = Work-done.
                                                 Kf - Ki   =   W
                                       (1/2) mvf - 0.0 = 1.30 J
    or,                                                  vf = 0.93  m/s

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