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  1. B

    Energy Problem

    A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 250 N/m, as shown in the figure. The spring is unstretched when the system is as shown...
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    Normal Force

    I'm trying to think up situations that will help me understand more complicated situations... Let's say I have: a box on a slanted slope on a chair on the floor The floor exerts a normal force on the chair. But, equal to what? is it: a box m_{1}gcos\theta on a slanted slope m_{2}g on a...
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    Newton's Laws and Friction Applied to Blocks

    Given: 2 wedge shaped blocks arranged as a rectangle. The bottom block is on a frictionless horizontal surface. Horizontal force Q is applied to the vertical side of the bottom block. Find Q max, the maximum value of Q where there is no slipping, in terms of us, m, and theta. Masses: m and m...
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    Lost Post

    I posted a reply in a thread (Falling Laundry) a couple of hours ago and now it's gone. Is this related to the server move? Should I just repost the reply?