After a match has burned which of these is not proof that a chemical reaction occurred? a) smoke was formed b) heat was released c) some of the match stick did not burn d) the red chemical on the end of the matchstick is gone

Aforce of 34.5 newtons is applied to an object at an angle of 45 º with the horizontal. what is the force acting on the object in the horizontal direction?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?