Physics

A 20 kg girl slides down a playground slide that's 3.2 m high. When she reaches the bottom of the slide her speed is 1.3 m/s. Assume any loss of energy is due to friction. If the slide is inclined at 20 degrees to the horizontal, what is the coefficient of kinetic friction between the fuel and the slide? (65.3N)

  1. 👍
  2. 👎
  3. 👁
  1. Well how much energy was lost to friction?
    Potential at start = m g h = 20 * 3.2 * g = 64 g = 64*9.81 = 628 Joules
    How much Kinetic energy was left at the bottom?
    (1/2) m v^2 = .5 * 20 * 1.3^2 = 16.9 Joules
    so
    628 - 17 = 611 Joules went into heating up the slide.
    That is the friction force * the slide distance
    611 = Ff * 3.2/sin 20 = Ff * 3.2 /.342
    so Ff = 65.3 Newtons (but that is not the answer. It asked for the coef.)
    Ff = mu m g cos 20
    65.3 = mu * 20 * 9.81 * .94
    mu = 0.354

    1. 👍
    2. 👎
    👤
    Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    21.7 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 2.2 m/s How many joules of thermal energy are created due to friction as a kid slides down a slide?

  2. physics

    A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]

  3. physics

    A 66-kg baseball player slides into third base. He starts his slide at a speed of 4.3 m/s and his speed is zero just as he reaches the base. If the coefficient of friction between his clothes and the surface of the baseball

  4. Physics

    A 25g ball slides down a smooth inclined plane. 0.850m high, that makes an angle of 35 degrees with the horizontal. The ball slides into an open box of 200g mass and they slide off the end of the table 1m high. How far from the

  1. PHYSICS

    Starting from rest at the top, a child slides down the water slide at a swimming pool and enters the water at a final speed of 5.59 m/s. At what final speed would the child enter the water if the water slide were twice as high?

  2. Physics

    A child goes down a playground slide with an acceleration of 1.24 m/s^2. Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 32.0 degrees below the horizontal.

  3. Physics

    A 18 kg child slides down a 4.0 m-high playground slide. She starts from rest, and her speed at the bottom is 2.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

  4. Educatinal Tech

    Which of the following is true about hidden slides? A: They can only be seen in Slide Sorter View. B: They can be seen in most views and during the slide show presentation. C: The slide is permanently hidden. D: The slide cannot

  1. educational technology

    3. adding transitions to slides in a presentation A. offers effects when moving from one slide to the next.***** B. adds animation to selected text and images. C. adds a new slide to a presentation in microsoft powerpoint. D.

  2. physics

    At a playground, a 19.8 kg child plays on a slide that drops through a height of 2.13 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -319 J on the child. What is the

  3. physics

    The question is a child slides down a slide with a 28 degree incline and at the bottom her speed is precisely half what it would have been if the slide had been frictionless. Calculate the coefficient of the kinetic friction

  4. Science

    a child mass m slides down a slide 5 m high. the child speed at the bottom of the slide is 3 meters per second. what is the percent of mechanical energy the child has at the top of the slide. converted to kinetic energy

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