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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 $0.130 per kW·h? __________$
an electron that has a velocity withxcomponent 2.9 x 106 ms andycomponent 3.7 x 106 ms moves through a uniform magnetic
Four equal positive point charges, each of charge 5.7?C , are at the corners of a square of side 9.2 cm. What charge should be placed at the center of the square
A 500-kg elevator is pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevator? A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined at 30.0 degrees from the horizontal. If the box slides a..
One of James Bond's adversaries is standing on a frozen lake. There is no friction between his feet and the ice. what is the magnitude of his horizontal recoil velocity
Find the electric potential as a function of time at point (0.2, 0.4, 0.0) use K * (Px(t)^x + Py(t)^y + Pz(t)^z) / (divided by) r^3
Assuming the train has an average speed during a trip from the train stop to the airport of 250[km=hr], how long will it take to make the trip [minutes]. Assuming the train can accelerate to its fastest speed in 5[s]
A rifle with a weight of 25 N fires a 4.0-g bullet with a speed of 240 m/s. Find the recoil speed of the rifle
A certain lightbulb is rated at 75.0 W when operating at an rms voltage of 120 V. What is the resistance of the bulb
A think disk of radius R carries a surface charge σ. It rotates with angular frequency ω about the z axis, which is perpendicular to the disk and through its center. What is B along the z axis? What is the magnetic moment of the spinning disk?
A stone with a mass of 0.600kg is attached to one end of a string 0.800m long, Find the maximum speed the stone can attain without breaking the string
A digital audio compact disc carries data along a continuousspiral track from the inner circumference of the disc to theoutside edge. Each bit occupies 0.6 µm of the track. Find the total length of the track
A fan rotating at 20 rpm slows down by a constant acceleration and comes to a stop in a time of 4.7 s. What is its angular displacement in this time? Give your answer in radians, do not enter units.
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