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Get Full Access to University Physics - 13 Edition - Chapter 13 - Problem 10e
Get Full Access to University Physics - 13 Edition - Chapter 13 - Problem 10e

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# The point masses m and 2 m lie along the x -axis, with m

ISBN: 9780321675460 31

## Solution for problem 10E Chapter 13

University Physics | 13th Edition

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University Physics | 13th Edition

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Problem 10E

The point masses ?m and 2 ?m lie along the x -axis, with m at the origin and 2 ?m at x = L. A third point mass ?M is moved along the x -axis. (a) At what point is the net gravitational force on ?M due to the other two masses equal to zero? (b) Sketch the x -component of the net force on ?M due to m and 2 ?m?, taking quantities to the right as positive. Include the regions x < 0, 0 < x < L, and x > L. Be especially careful to show the behavior of the graph on either side of x = 0 and x = L.

Step-by-Step Solution:

Solution 10E Introduction We have to first calculate the distance at which the force is equal. Then we have to draw the graph of the force on the all in all three region as asked in the question. Step 1 Let us consider that at x the net gravitational force is zero. Hence the gravitational force acting on the M at x is given by F = GMm 1 x2 Negative sign because the force will act towards the negative x axis. And the gravitational force acting on M due to 2m is F = GM(2m) 2 (Lx) So the total force is GMm + GM(2m) = 0 x2 (Lx) 2 2 (L x) = 2x x = 2.41L and 0.41L Now ignoring the negative sign, as the force is only attractive, the equilibrium position will be in between the two masses, we get x = 0.41L The net force on the mass M will be equal to zero at x = 0.41L

Step 2 of 2

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