Circular Motion Equation homework

[Sarah00]

Homework Statement

Homework Equations

Circular Motion Equation

The Attempt at a Solution

I solved the problem and got the result to be 6 m/s2 but it is not one of the answers. I was pretty sure of my solution. So, are all choices wrong?

F = ma
mg sin 37 = ma
a = g sin 37 = 6.01 m/s2

 

[Nathanael]

Yep I agree with you.

 

[rude man]

I got 5.9 ms^-2 so same answer if g = 9.8 ms^-2 instead of 10.
BUT - I don't like your rationale.
The force on the mass includes the tension from the string which you have ignored.
I suggest instead τ = Id²θ/dt²
I = mR²
etc.
Answer is the same though.
EDIT: on the other hand, maybe you were quick enough to realize that the tension vector, being orthogonal to the tangent vector, cannot impart force, therefore acceleration, in the tangential direction, making what you originally did 100% justified.