Mechanics problem: Ladder on a wall help please

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Mechanics problem: Ladder on a wall help please :(

Homework Statement


"A ladder of weight 200n and of length 5m rests with its lower end on a horizontal rough concrete surface and its upper end against a smooth wall. if the ladder just starts to slip when the angle between it and the concrete is 40(degrees) calculate the coefficient of static friction:"

having trouble with trigonometry here, i can do questions where i have lengths but no angle but this one is spinning me out.
 
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Welcome to PF!

Hi learning420! Welcome to PF! :wink:

Draw a diagram showing the normal force form the ground, the friction force, the weight, and the direction of the force from the wall, and take components and moments …

what do you get? :smile:​
 
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