force at point A and E (Static Equilibrium)


by abcnat
Tags: equilibrium, force, point, static
abcnat
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#1
Jan4-14, 01:02 PM
P: 4
a man is trying to fix the light bulb at the top of his house ceiling.to reach the bulb,he is using a stepladder that is in equilibrium state.sides AC and CE are each 9.0 m long and hinged at C.Bar BD is attached with a rod that is 3.0 m long,halfway up.The man who is climbing 5.0 m along the ladder (AC) is 67 kg in weight.Assume that the floor is frictionless and the mass of the ladder is negligible.
Find the forces at points A and E.

at point A i get
Fna(9sin19.47)-(67x9.8)(4sin19.47)-4.5sin70.53T=0

at point E
Fna(9sin19.47)-4.5sin70.53T=0

please help me
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