Author Question: A 7.0-kg block on a horizontal frictionless surface is attached to a light spring (force constant = ... (Read 280 times)

V@ndy87 · **on:** Aug 1, 2020

Question 1

A 6.0-kg block slides along a horizontal surface. If µ_k = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?

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−59 W

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−47 W

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−71 W

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−82 W

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+71 W

Question 2

A 7.0-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 1.2 kN/m). The block is initially at rest at its equilibrium position when a force of magnitude P acting parallel to the surface is applied to the block, as shown. When the block is 8.0 cm from the equilibrium position, it has a speed of 0.80 m/s. How much work is done on the block by the force P as the block moves the 8.0 cm?

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7.4 J

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5.4 J

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6.1 J

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6.7 J

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4.9 J

ebenov · **Reply #1 on:** Aug 1, 2020

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