A Crate Of Mass a 145 6 Block e x cl wwwwebassign.net/web/Student Assignment. Re

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A Crate Of Mass a 145 6 Block e x cl wwwwebassign.net/web/Student Assignment. Responses/submit ?dep-1739 1842 Need Help? 4PD A 14.5-lb block rests on a horizontal floor (a) What force does the floor exert on the block? magnitude lb (b) A rope is tied to the block and is run vertically over a pulley. The other end is attached to a free-hanging 10.5-lb object. What now is the force exerted by the floor on the 14.5-lb block? Ib magnitude direction (c) If the 10.5-lb object in part (b) is replaced with a 38.5-lb object, what is the ferce exerted by the floor on the 14.5-lb block? magnitude direction Select lb Need Help? need Talk to a Tutor 11. 1/2 points | Previous Answers SerCP9 4 P043 soln My Notes Ask Your patternT3 (1).jpg

Explanation / Answer

A) Because the block is at rest, the acceleration is zero.

So the equation F=ma becomes F=0

for part a, take the sum of the forces in the y direction

Fy=(normal force)-weight=0

because lb is a measure of weight and not mass, you do not need tomultiply by the force of gravity

N=weight= 14.5 lb

B) F=N+T-W=0

N=W-T

N=14.5 - 10.5 = 4 lb

C) If we exchange the 10.5 lb wieght with a 38.5 lb weight, it will pull the 14.5 lb block into the air, This will result in the normal forcebeing exerted on the 14.5 lb block to become zero because it is no longer in contact with that floor.

Please rate my answer if you find it helpful, good luck...

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