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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 particle moving along the x xis in simple harmonic motion startsequilibrium position, the origin at t=0 and moves to the right. Find the maximum particle acceleration of the particle
two metal objects have net charges of 81 pc and -81 pc which result in a 26 v potential difference between them. a what
Two current-carrying wires are exactly parallel to one another and both carry 3.5 A of current, What is the direction of the magnetic force caused by wire 2 on wire 1
A series RLC circuit consists of a 96.0 ? resistor, a 0.200Hinductor, and a 43.0 ?F capacitor. It is attached to a120 V/60 Hz power line. What is the average power loss
If 58.4kW is to be transmitted over two 0.130Ohm lines, estimate how much power is saved if the voltage is stepped up from 115V to1240V and then down again, rather than simply transmitting at 115V. Suppose the transformers are each 98.8 percent effic..
The neutrons in a neutron star (Chapter 44 in the textbook) can be treated as a Fermi gas by neutrons in place of the electrons in our model of an electron gas.
A coffee filter of mass 1.4 grams dropped from a height of 3 m reaches ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter.
An electron is in a vacuum near earth's surface and located at y =0 on a vertical y axis. At what value of y should a second electronbe placed such that its electrostatic force on the first electronbalances the gravitational force on the first electr..
A 3.0cm x 3.0cm parallel-plate capacitor has 3.0 mm spacing. The electric field strength inside the capacitor is 1.4 x 105 V/m. How much charge is on each plate
A moving particle encounters an external electric field that decreases its kinetic energy from 9460 eVto 7120 eV as the particle moves fromposition A to position B.
A tank shoots a bullet horizontally from the top of a mountain of 50 meters with a velocity of 2776 km/h. If at the same time, a captain drops his hat from the same place, which one descends faster, the bullet or the hat?
Two railroad cars, each of mass 6400 kgare traveling 94 km/h toward each other.They collide head-on and come to rest. How much thermal energy is produced in this collision
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