4 of 4 td A penny is sitting on rotating tuntable. At the moment when the penny

Question

4 of 4 td A penny is sitting on rotating tuntable. At the moment when the penny is on the far lett as shown in the diagram, which free body diagram most accurately depiets the forces on the penny C) Di t) None of these diagrams is accurate 1S A box of mass m, starting at rest, slides down a frictionless ramp of height h. At the bottom of the ramp is a rough loor The coefticient of kinetic friction between the floor and the box is s How far along the rough surface does the box slide before coming to rst (ONUNT The work-energy theorem may be useful. h B) u h C)x D) mgh/us E) None of these.

Explanation / Answer

Question 15) Given , m be the mass , h be the height , u be the coefficient of friction

Let x be the distance travelled on rough surface

Now, finding the velocity of mass at down of the inclined plane :

Using conservation of energy ,

mgh = (1/2)*m*v^2

Since the friction is acting on the mass on the flat rough surface ,

(1/2)*m*v^2 = u*mg*x

From the above equations ,

u*mg*x = mgh

x = h/u

Therefore , Answer) option c) h/u

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