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# ps10 - and magnitude o² the gravitational ²orce on the...

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Assignment 10, Phys1112 Spring 2010 Due April 12 Y&F: 11.42, 11.46, 11.51, 12.61, 12.54 Problem 6 A ladder is leaning against a wall, with its bottom end making an angle θ with the horizontal floor. The coe ffi cients of static friction with the wall and floor are μ w and μ f respectively. At what angle θ does the ladder start to slip? Problem 7 Four spherical masses m are located at the corners of a square with sides of length d . Let one of corners be at the origin of the x - y plane, with the other corners in the first quadrant, i.e. all x,y coordinates of the other corners are positive. What is the direction
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Unformatted text preview: and magnitude o² the gravitational ²orce on the mass located at ( x, y ) = ( d, d )? Problem 8 Calculate the numerical value o² the ratio v moon /v esc where v esc is the usual escape velocity, i.e. velocity required to escape to in³nity, whereas v is the minimum speed needed at the sur²ace o² the earth in order to reach the sur²ace o² the moon. ( Keep in mind that once the object is close enough to the moon, the moon’s gravitational pull will take over.) 1...
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