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bfusco

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## Homework Statement

Consider the track shown in the figure. The section AB is one quadrant of a circle of radius 2.0 and is frictionless. B to C is a horizontal span 3.5 long with a coefficient of kinetic friction = 0.27. The section CD under the spring is frictionless. A block of mass 1.0 is released from rest at A. After sliding on the track, it compresses the spring by 0.35 .

A)calculate the velocity at point B.

B)Determine the thermal energy produced as the block slides from B to C.

C)calculate the velocity at point C.

D)determine the stiffness constant k for the spring.

## Homework Equations

## The Attempt at a Solution

A) i am having a hard time starting this question. for part A, i draw the free body diagram at the the top of the diagram (the side of the circle), i have the Normal force facing the center of the circle and the weight facing down. with that said i don't understand how to begin ƩF=mv^2/r equation in order to calculate the velocity.