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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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A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s.What is the frequency heard by the observer . What must be the result have been for the horizontal speed.
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The lens has a refractive index of 1.30. Find out the difference Δx in the positions where each crosses the principal axis.
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While a force of 6.0 N is applied, pulling the spring to the right, the elongation of the spring is 0.030m from its equilibrium position. What is the force constant of the spring
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An old trick to find out if a train is coming is to put your ear on the rails of the track. Why is this more effective than just listening for the sounds the train makes in air.
How to compute the average force
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