How much heat is needed to melt 13.74 kg of silver that is initially at 20°c?

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell