physics

a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. ) Suppose now friction is present and k = 0.10 but only acts while the block is actually compressing the spring. What is the speed at one-half of the maximum distance the block when friction is present?

  1. 👍 0
  2. 👎 0
  3. 👁 654
asked by sam
  1. energy in KE=spring energy+friction energy
    wo/friction: 1/2 m*25=1/2 k .68^2 solve for spring constant k.

    w/friction
    first find the max distance of compression.
    1/2 m 25=1/2 k xmax^2+.1mg*xmax

    solve for x max, note it is a quadratic.

    now, the hard part..speed when at the half way point.
    KE at half way=initialKE-PE+frictionloss
    1/2 vh^2=1/2 m 25 -1/2 k (xmax/2)^2 -.1mg(xmsz/2)

    solve for vhalf

  2. i did not get this . can u do little bit calculations too.

    1. 👍 0
    2. 👎 0
    posted by sam

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 4kg and a 2kg block are moving along a horizontal frictionless surface. The 4 kg block is moving to the right with a speed of 6 m/s and the 2 kg block is moving to the left with a speed of 3 m/s. The two blocks collide

    asked by Jon Routh on November 17, 2009
  2. Physics

    Can someone explain to me how I can solve this problem? This problem contains multiple parts but I'm stuck on the last two. Here is the full problem: A block of mass 2.5 kg is sliding at 10 m/s on an initially frictionless,

    asked by Bella on November 21, 2018
  3. Physics

    How can I solve this problem? A block of mass 75 kg is released from rest at the top of a smooth frictionless incline from an initial height of 2 m. At the bottom of the incline, the block slides along a rough horizontal surface

    asked by Anna on December 9, 2018
  4. physics

    A physics student pulls a block of mass m = 23 kg up an incline at a slow constant velocity for a distance of d = 4 m. The incline makes an angle q = 25° with the horizontal. The coefficient of kinetic friction between the block

    asked by Mel on March 11, 2012
  5. physics ( please help me)

    A 2.00kg block is pushed against a spring with force constant k=400N(m^-1), compressing it 0.180m. The block is then released and moves along a frictionless horizontal surface and then up frictionless incline with slope angle

    asked by taylor on February 23, 2012
  1. physics

    [20 pts] A 2.00 kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a frictionless, horizontal surface and then up a

    asked by joy on August 19, 2010
  2. PHYSICS

    An object is originally moving at 13 m/s at the top of a frictionless, quarter-circular ramp with a radius of R = 13 meters. It then travels on a frictionless horizontal surface, around a frictionless loop of radius r = 2 meters,

    asked by Kelsey on October 27, 2011
  3. physics

    With a mass = 10 k .. the horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is he block moving at the instant the spring has been compressed 15

    asked by monea on April 27, 2013
  4. Physics

    What force must be exerted on block A in order for block b not to fall. The coefficient of static friction between block A and B is 0.55, and the horizontal surface is frictionless. A= 100kg and B=10kg A is on the horizontal

    asked by Kayla on October 3, 2011
  5. Phsics

    What force must be exerted on block A in order for block b not to fall. The coefficient of static friction between block A and B is 0.55, and the horizontal surface is frictionless. A= 100kg and B=10kg A is on the horizontal

    asked by Kayla on October 3, 2011
  6. Physics

    A 1.2 kg block is attached to a horizontal 23 N/m spring and resting on a frictionless horizontal surface. The block is set oscillating with amplitude 10 cm and phase constant – π/2. A 2nd block with mass 0.8 kg moving at 1.7

    asked by Erick on May 24, 2012

More Similar Questions