Physics

posted by .

You slide your friend with a mass of 65 kg out of the way as they are blocking the exit and keeping you from escaping from physics class where you have been tormented by problems for the last hour and a half. The coefficient of kinetic friction between the floor and your friend's shoes is 0.45 and you are able to push with 650N. How long will it take you to get your friend to their next class that is 35m down the hall from rest? (Answer: 3.5 seconds) I have worked the problem and checked my math. I get 1.99 seconds.

  • Physics -

    friction force = 65*9.81*.45 = 287 N

    net force = 650-287 = 363 N

    F = m a
    a = 363/65 = 5.59 m/s^2

    x = (1/2) a t^2
    35 = .5 (5.59) t^2
    t = 3.54 seconds

  • Physics -

    Thank you!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    I need help with this physics problem: A child slides down a playground slide; the coefficient of kinetic friction is uk=0.25, and angle that the slide makes with the horizontal is 28.0 degree. She begins from rest and slides through …
  2. 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 between …
  3. English

    1. I have a friend who goes biking many times. 2. I have a friend who goes hunting every weekend. 3. I have a friend who got the first prize in the speech contest. 4. I have a friend who is the first in grades his class. 5. I have …
  4. College Physics

    A child slides down a slide with a 24 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 kinetic friction between the slide and the child.
  5. Physics

    At a playground, a 18.7 kg child plays on a slide that drops through a height of 2.07 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -318 J on the child. What is the child's …
  6. Physics

    At a playground, a 18.7 kg child plays on a slide that drops through a height of 2.07 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -318 J on the child. What is the child's …
  7. Physics

    A spring is mounted horizontally. A crate which has a mass of 8.5kg is pressed against the spring with a force of 350N. As a result the spring is compressed a distance of 82.0cm. The mass is then released and is allowed to slide along …
  8. Language Arts

    Help Please!! Answer the following question about the essay "Escaping." Give an example of one internal and one external conflict from the selection. (Escaping) Nowadays we live in a constant hurry, compete with each other, we are …
  9. Physics for Technology

    I have been out of school 27 years; no Algebra or Trigonometry training: only remedial math. This class is part of a Diploma program, no placement test required - I am out of my depth. I had a tutor for an hour last Tues., with another …
  10. Physics Dynamics

    A child slides down a slide with a 24o incline, and at the bottom her speed is precisely one-third what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the …

More Similar Questions