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Physics Man on ladder wishes to avoid the ladder slipping

Joe_1234

New member
May 15, 2020
25
A 6 m ladder weighs 350N and is placed with its lower end on a horizontal floor and its upper end against the wall. The angle between the wall and the ladder is 30°. A man weighing 900N is to climb to the very top of the ladder. The coefficient of friction between the floor and the ladder to avoid the danger of slipping is?
 

MarkFL

Administrator
Staff member
Feb 24, 2012
13,736
Can you show what you have so far so we know where you're stuck?
 

Joe_1234

New member
May 15, 2020
25
I have this diagram, but I'm not sure about this 900 N, on top of the ladder already?
 

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
644
$\sum F_x = 0$, $\sum F_y = 0$, and $\sum \tau = 0$

EC3D7510-DF2D-4271-A829-2C81102E0BDA.jpeg
 

Joe_1234

New member
May 15, 2020
25

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
644
I forgot there is a friction between the wall and the ladder which is 0.20
Which direction do you think the wall friction acts on the ladder?