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Solving a block and incline Physics problem with an unknown angle

A factory machine is required to pull heavy crates up a frictionless ramp. If the machine's motor can exert a maximum force of 1100 N, and the crates have a mass of 1800 kg, what is the maximum angle the ramp can set at for the machine to move the crates?

The force the motor has to overcome is the component of the crate's weight W that is along the direction of the ramp (tangential to the inclined plane). If the ramp is inclined at an angle $\theta$ , the components of the crate's weight are $W \cos \theta$ normal to the inclined plane and $W \sin \theta$ tangential to the incline. Can you take it from here?

Thanks! I got it! (:

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