Physics

posted by .

A 24.5N brick slides from rest down an 11.2m, 53.0 degree ramp with a meu=0.45. At the bottom, it strikes a stationary 36.8N brick, and then the two slide on together. How far will the two slide on a level surface with a coefficient of friction of 0.080?

This problem must be done in three steps.
(1) Compute speed of the 24.5 N brick at the bottom of the ramp before it hits the 36.8 N brick. One way to do it is subtracting friction work from the potential energy loss to get the kinitic energy.
(2) The collision of the bricks is inelastic; otherwise they not stick. Use conservation of momentum to get the in initial speed of the two bricks sliding together.
(3) Use energy prinicipas again to get the didtance they slide together.
Initial kinetic energy (when they start sliding together) = (Friction force) x (distance they slide)

How would you calculate the first step though?

Part (1) goes like this:
The friction force on the brick sliding down the ramp is
(24.5 N) cos 54.3 * 0.45 = 6.43 N
Friction work = 6.43N x 11.2 m = 72.1 J
Potential energy release = (24.5)*11.2 m * sin 54.3 = 222.8 J
Kinetic energy of the sliding mass before collision = 222.8 - 72.1 = 150.7 J = (1/2) M V^2
M = 24.5/g = 2.5 kg
V(before collision) = sqrt (2*150.7/2.5) = 11.0 m/s

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. Geometry

    Children climb 8 ft to the top of a slide. The end of the slide is 1 ft above the ground and the slide rises at a 45 degree angle. If the slide makes a straight line from the top to the bottom, how far does a child travel down the …
  4. physics

    a 65 kg student, starting from rest , slides down an 8 meter high water slide. how fast is he going at the bottom of the slide ?
  5. physics

    Two identical twins, Amy and Beatrice, are on top of two different slides, one on each slide. Both slides start 3 m above the ground and end 0.5 m above the ground. Amy's slide is a straight, 45 degree slide with height given by h=−x+3 …
  6. physics

    Two identical twins, Amy and Beatrice, are on top of two different slides, one on each slide. Both slides start 3 m above the ground and end 0.5 m above the ground. Amy's slide is a straight, 45 degree slide with height given by h=−x+3 …
  7. physics

    Doyle goes bowling with a cement brick to improve his score. If the brick has a mass of 1.5kg and an initial speed of 5.0m/s upon release a)how much kinetic energy did it possess upon release i.e. when let it go and b)how far will …
  8. Physics

    A 50 kg student, starting from rest, slides down an 10.8 meter high water slide. How fast is he going at the bottom of the slide?
  9. Physics

    Hi, I've been having trouble with this physics problem. I'm not sure where to begin. A brick with mass m1=2.5 kg can move without friction on a horizontal plane. The brick is attached to a wall by an ideal spring with spring constant …
  10. Physics

    Could someone please help walk me through this problem I'm struggling with?

More Similar Questions