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1. What is the efficiency of a subject on a treadmill who puts out work at the rate of 105 W while consuming oxygen at the rate of 2.00 L/min?(Hint:If the oxygen consumption is 2.00 L/min,then the power input is 700 W.) _______________
2. A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time, answer the following.
a) How many people would it take to run a 3.00 kW electric clothes dryer? _______ people
b) How many people would it take to replace a large electric power plant that generates 700 MW?_________people
3. A large household air conditioner may consume 10.0 kW of power. What is the cost of operating this air conditioner 4.50 h per day for 40.0 d if the cost of electricity is $0.130 per kW·h? __________$
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
Question: Field and force with three charges? What is the electric field at the location of Q1, due to Q 2 ?
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Illustrate the cause of the components accelerating from rest down the conveyor.
Calculate the dc voltage applied to the circuit.
Quadrupole moments in the shell model
Determine the tension in each string
Calculate the smallest coefficient of static friction necessary for mass A to remain stationary.
Evaluate maximum altitude?
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