Why is Tension Greater Than ma in a Horizontal Pull Scenario?

[physicsgurl12]

Homework Statement

a box withmass m is pulled with a constant a along a horizontal frictionless floor by a wire that makes a 5 degree angle above the horizontal. why is the tension greater than ma?

Homework Equations

f=ma

The Attempt at a Solution

i don't know where to start
f=t+mg

 

[SammyS]

Draw a Free Body Diagram.

 

[lightgrav]

vector components: parallel the motion, and perpendicular to the motion.