R'B2R/3Figure P5.71The particle described in Problem 71 (Fig. P5.71)is released from point A at rest. Its speed at B is 1.50 m/s.(a) What is its kinetic energy at B? (b) How much mechanicalenergy is lost as a result of friction as the particle goes from Ato B? (c) Is it possible to determine u from these results in asimple manner? Explain.

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Asked Dec 18, 2019
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R'
B
2R/3
Figure P5.71
The particle described in Problem 71 (Fig. P5.71)
is released from point A at rest. Its speed at B is 1.50 m/s.
(a) What is its kinetic energy at B? (b) How much mechanical
energy is lost as a result of friction as the particle goes from A
to B? (c) Is it possible to determine u from these results in a
simple manner? Explain.
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R' B 2R/3 Figure P5.71 The particle described in Problem 71 (Fig. P5.71) is released from point A at rest. Its speed at B is 1.50 m/s. (a) What is its kinetic energy at B? (b) How much mechanical energy is lost as a result of friction as the particle goes from A to B? (c) Is it possible to determine u from these results in a simple manner? Explain.

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Expert Answer

Step 1

Given data:

Speed of the particle at A, VA = 0 m/s

Speed of the particle at B, VB = 1.50 m/s

Let the mass of the particle be m

Step 2

(a)

The kinetics energy of the block at B:

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K.E К.Ев 2. -ту, хтx (1.50)* 2 = 1.125m J

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Step 3

(b)

The mechanical energy lost as the ...

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Energy lost = K.E, – P.E. =1.125m – mgR =1.125m – m × 9.8R = (1.125 – 9.8R)R

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