Coefficients of friction for plastic on wood
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much horizontal force would you need to apply to a 3.0-lb plastic calculator to start it moving from rest.
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A certain metal with atomic mass 2.9 × 10-25kg has an interatomic bond with length 1.8 × 10-10 m and stiffness 47 N/m. What is the speed of sound in a rod made of this metal?
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Assume that the net horizontal force is due to rolling friction only and take the free-fall acceleration to be g = 9.80 m/s^2. What is the coefficient of rolling friction mu_r for the tire under low pressure?
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