c Q Searh Class Management I Help Newtons Law and Application Begin Date: 10/4/2

Question

c Q Searh Class Management I Help Newtons Law and Application Begin Date: 10/4/2017 12:00.00 AM-Due Date: 10/25/2017 12:00:00 AM End Date: 11/23/2017 12:00:00 AM (5%) Problem 17: A spring with a spring constant of. 150 Nm is initially compressed by a block a distance d 0.21 m. The block is on a horzontal surface with coefficient of kinetic frictionPk, static friction and has a mass of m = 2 kg. Unstretched Length Otheexpertta.com - i 33% Part (a) Assuming the block is released rom the mutal postion and begu stomove to the right, inp f the forces in the x-direction in the configuration shown above, using the variables provided 33% Part (b) How large would the coefficient of static fiction need to be to keep the block from moving? > 33% Part (c) Assuming the block has just begun to move and the coefficient of kinetic friction isR 02, what is the block's acceleration in meters per square second? ut an expression for the sum co Grade Summary 0% 10096 Potential Submissions Attempts remaining: 20 0-per attempt) cotanO asin acos0 atan) acotansinh0 coshO tanh0 cotanh0 detailed view ° Degrees Radians

Explanation / Answer

a] forces in horizontal are spring and friction,

F = kd - ukmg

b] For being at rest, F = 0

kd = usmg

us = kd/mg = 150*0.21/(2*9.8)

= 1.607 answer

c] F = kd - ukmg

a = F/m = kd/m - ukg

a = 150*0.21/2 - 0.2*9.8

a = 13.79 m/s answer

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