A 1.6 kg breadbox on a frictionless incline of angle theta = 39 degree is connec

Question

A 1.6 kg breadbox on a frictionless incline of angle theta = 39 degree is connected, by a cord that runs over a pulley, to a light spring of spring constant k = 110 N/n, as shown in the figure. The box is released from rest when the spring is unstretched. Assume that the pulley is massless and frictionless. (a) What is the speed of the box when it has moved 10.3 cm down the incline? (b) How far down the incline from its point of release does the box slide before momentarily stopping, and what are the (C) magnitude and (d) direction of the box?s acceleration at the instant the box momentarily stops? (a) Number_____ Unit______ (b) Number__________ Unit_________ (c) Number_________ Unit__________ (d) Direction ______________________

Explanation / Answer

a) 0.736 m/s

b) 0.179 m

c) net force on box = K*0.179 - mgsin39o

= 9.82 N

accleration = 9.82/1.6 = 6.14 m/s2

d) up the incline

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