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Robert5742
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Homework Statement
A rod extends from a vertical wall at an angle of 27º from the horizontal. A 2.5-kg lamp is mounted at the end of the rod. After John throws his 300-g winter coat over the lamp, what is the magnitude of the tension in the rod?
The answers choices are:
A) 30N
B) 70N
C) 27N
D) 22N
Homework Equations
F = ma
The Attempt at a Solution
Since the only force acting on it is $F_t$ tension is equal to T = mg/sin(theta)
So when I plug in my knowns I get T = (9.8*2.8) (2.5kg + 300 g (300g = .3kg)/(sin(27)) which is equal to 28.691... which is not one of the answer choices. Am I using the wrong formula?