##### A box of mass 22 kg is at rest on a flat floor. The coefficient of static fricti

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7. A box of mass 22 kg is at rest on a flat floor. The coefficient of static friction between the box and floor is 0.37. What is the minimum force needed to set the box in motion across the floor?

8. A force of magnitude F stretches a spring a distance of 2 cm from its rest position. What magnitude of force will stretch the spring an additional 4 cm?

9. A force of magnitude 44 N compresses a spring 0.69 m from equilibrium. What is the value of the spring constant?

May 18th, 2015

7)

Fa=mg

Fa=22*10=220

Fm=Us*Fa

Fm=0.37*220=81.4 N

8)

by hooks law
Fa=-kx

k=-Fa/0.2

now

F=(-Fa/0.2) * 0.4

F=-2Fa

twicw then the earliest force will b required

9)

F=-kx

k=-F/x

k=-44/0.69

k=63.76

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May 18th, 2015

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May 18th, 2015
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May 18th, 2015
Oct 23rd, 2017
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