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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?
Explanation & Answer
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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