How is the answer to this 130N?
physics moments question

Explanation:

Torque is the cross product of the radius vector and force vector.

τ = r × F

The magnitude of the torque is the force times the perpendicular distance.  In other words, it is the force times distance times the sine of the angle between them.

τ = F r sin θ

Summing the moments where the beam meets the wall:

∑τ = Iα

(-20 N) (3 m) + (T sin 70°) (1.5 m) = 0

(T sin 70°) (1.5 m) = 60 Nm

T sin 70° = 40 N

T = 42.6 N

The answer cannot be 130 N, unless there is a mistake in the question.

i think they are all correct

explanation:

they seem good