A ball was swung at constant speed in a horizontal circle on the top of a level lab table. Which of the following was the direction of the
acceleration on the ball?

Asample of a gaseous substance changes into a liquid

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

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