Recent content by zizikaboo

  1. Z

    Potential energy and a skateboard, only have until 11:30

    here's what i did. plug all the numbers into Wnc= (1/2mvf^2-1/2mv0^2)+(mghf-mgh0) and you get Wnc= a number + a number *(h0-hf) then you go and find Wnc first since it already told you in the question= +80-265 and you get -185. so -185=a number + a number *(h0-hf) and you can now find out...
  2. Z

    Another Question: Find the work done by the kinetic frictional force

    A 300N force is pulling an 90.0 kg refrigerator across a horizontal surface. The force acts at an angle of 22.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 6.00 m. i found out the work done by pulling force is 1669 J and its...
  3. Z

    The Conservation of Mechanical Energy

    help I'm really stuck on this question! A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill. The crest of the second hill is circular, with a radius of r = 45 m. Neglect friction and air resistance. What must be the height h of the first hill so...