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If a coal burning electrical generating plant burns 2 tons of coal to generate 6000 kWh of electricity, calculate the efficiency of the plant as the ratio of electricity output to fuel energy input.
Consider resistors R1 and R2 connected in series E R1 R2 and in parallel E R1 R2 to a source of emf E that has no internal resistance. How does the power dissipated by the resistors
A 150 Newton horizontal force pushes a 20 kg mass sitting on a horizontal surface. Additionally, the horizontal surface exerts a 50 Newton frictional force on the mass. find the hydroxide-ion concentration of this solution
A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.4 m/s2. If the tension in the cord is 86 N, what is the lamp's mass
A plane accelerates from rest at a constant rate of 5.00m/s^2 along a runway that is 1800m long. What is the distance traveled by the plane in the last second before taking off
In the first 3.1 seconds of a bobsled run, the 45 kg sled is pushed until it reaches a speed of 1.14 m/s. What constant force is exerted by the bobsled team
Find the maximum weight for the car if the springs should be compressed no more than 4.2 cm when the car is at rest
The top and bottom margins of a poster are 4 cm and the side margins are each 5 cm. find the dimensions of the poster with the smallest area
A coil with internal resistance can be modeled as a resistor and an ideal inductor in series. Assume that the coil has an internal resistance of 1.60 ?, What is the quality factor of the circuit
A barge on the Ohio river is 35 ft wide and 200 ft long with walls which are 12 ft high. One day you see it going up river empty and 10.5 ft of the barge is above water. What is the mass of the barge
A spring has a spring constant of k = 7.500N/m. If the spring is displaced 0.5500 from its equilibrium position, what is the force that the spring exerts
1. in the experiment you will be using the speed of sound in your metal bar to help determine the youngs modulus of
What is direction of the velocity of the canoe
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