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Q1. Over a 30-day period a power plant generates an average of 751 MW of electrical power and 1225 MW of waste heat, and burns 1.83×108 kg of coal. Imagine that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion throughout the 30 days?

Q2. A spring with spring constant 14 hangs from the ceiling. A ball is attached to the spring and authorized to come to rest. It is then pulled down 3.0 and free. The ball makes 17 oscillations in 16 seconds. What is it the mass of the ball?

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