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What are 3 of the sources of energy that can make matter emit light? What are two examples of a luminous source that produces a line spectrum? Electric field lines are drwan with arrows to show the directions of the force on an? Does an object that's dense heavy for its mass or density? Is a true statement A. Energy can be destroyed but not created. B. The total amount energy in the universe changes rapidly. C. Energy can be created but not destroyed. D. Energy cannot be created? If a space probe has a speed of 2 x 10 to the 4 m per s as it leaves the earth's atmosphere what is its speed when it is very far from the earth? What would happen if you touched a knob of positivly charged electroscope with another positivel charged object? What are the reasons that people use nuclear energy? What are the benefits of using an incline bike machine for cardiovascular exercise? Density is defined as the mass per unit volume The density of ice is 0.92 gcm3 An ice cube 1.0 inch on a side has a mass of? Why can light pass through clear objects? What do different waves carry carry from one place to another? What makes a good insulator of cold? Why were the elements uranium and plutonium used in the atomic bombs of the Manhattan Project? What is the realstionship between a fundamental note and it and overtones? What fields of science was Albert Einstein in? Is the gravitational force negative? The reason the Sun's radiant energy is of shorter wavelengths than the Earth's is because the Sun? How is fog an example of condensation? Why is it important to study vector and scalar quantity?