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How many nanoseconds are in 4 seconds? What must occur for the potential energy of fossiL fuel to change into other forms of energy? Who invented the watt? If you know the density and volume of a substance how could you find its mass? Does mercury contain radiation? Why a balloon don't pop on many thumbtacks? Is a dehumidifier an air conditioner? Red green and blue light rays to enter a drop of water from the same direction which light rays pass through the drop willbend the most and which will bend the least whyv? A 10 kg rock is pushed off the edge of a bridge 50 meters above the ground. what was the kinetic energy of rock befor it began to fall? Is a dependent variable the factor that stays the same in an experiment? Is a eraser a insulator or a conductor? What is the force that acts against motion when two surfaces are touching? What is a trumbone made from? What is the difference between indoor and outdoor humidity levels? When water vapor is added to the air the density of the air is? When you hit a nail into a board using a hammer the head of the nail gets warm in terms of kinetic and thermal energy describe why you think this happens? What happens to the energy in a collision between objects? Three tin cans sit in front of you on the ground. one is emptyone is filled with sandand one is filled with lead shot How could you determine which is which? What evaporates from the skin and carries body heat away? What is the force called that makes a parachute go up?