A 2.35-kg uniform bar oflength l = 1.30 m is heldin a horizontal position bythree vertical springs as inFigure P8.83. The two lowersprings are compressed andexert upward forces on thebar of magnitude F1= 6.80 Nand F2 = 9.50 N, respectively.Find (a) the force Fs exertedby the top spring on the bar,and (b) the location x of the upper spring that will keep thebar in equilibrium. Figure P8.83www.wW-

a)Weight of the bar = mxg = 2.35×9.8 = 23.03 N

Answered: Figure P8.83 www. wW-

Science

Physics

Figure P8.83 www. wW-

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter8: Conservation Of Energy

Section: Chapter Questions

Problem 58PQ

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Concept explainers

Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest. 

Question

A 2.35-kg uniform bar of
length l = 1.30 m is held
in a horizontal position by
three vertical springs as in
Figure P8.83. The two lower
springs are compressed and
exert upward forces on the
bar of magnitude F₁= 6.80 N
and F₂ = 9.50 N, respectively.
Find (a) the force F_s exerted
by the top spring on the bar,
and (b) the location x of the upper spring that will keep the
bar in equilibrium.

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