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I want to make a game where a physics object is launched from a cannon at different speed and powers, the problem is getting the object to launch out at the angle of the cannon but the function physics_apply_impulse() is based on having an x force and a y force not a power and an angle... so my question is is there any way to translate an angle to the the 2 forces?

Use the lengthdir_x/y functions to get the x/y vectors for the impulse functions. Just give the launch angle as the direction and the force for the length.

PS: you may need to offset the direction by 90º as the physics directions have 0º at the top, not to the right, IIRC.