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What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.

What type of energy conversion occurs when you place your feet near the fire place and they become warm