##### I need help with a physics problem

label Physics
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A uniform ladder of length L and mass m1 rests against a frictionless wall. The ladder makes an angle θ with the horizontal. (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when a firefighter of mass m2 has climbed a distance x along the ladder from the bottom. (b) If the ladder is just on the verge of slipping when the firefighter is a distance d along the ladder from the bottom, what is the coefficient of static friction between ladder and ground.

Nov 10th, 2015

μsw is the coefficient   between the ladder and the wall in our problem this is zero

μsf is the coefficient between the ladder and the floor

a = θ angle

thus tanθ= 1 / 2μsf => μsf = 1/ 2tanθ

Nov 10th, 2015

I was wrong the correct problem is here

https://notendur.hi.is/eme1/skoli/edl_h05/masteringphysics/11/aPersonStandingOn.htm

Nov 10th, 2015

the coefficitent will be     μ = ( m1 * d + m2 * L/2 ) cos(θ) / (m1 + m2) L sin(θ)

Nov 10th, 2015

the correct forces diagram which accounts for the masses m1 and m2 is in the image

Nov 10th, 2015

Nov 10th, 2015
solito.jpg

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Nov 10th, 2015
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Nov 10th, 2015
Oct 23rd, 2017
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