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Assume the retail price of electricity is $.18 per kilowatt-hour
1. What does it cost to leave a 200 watt light bulb on for 10 hours ?
2. The little red light on some clocks and CD players consumes about 2 watts. What does it cost to have that light on for a month (30 days).
3. In 2003, the Schuylkill Generating Station near South Street on the Schuylkill River was rebuilt as an oil fired plant. It produces 175 Megawatts. What is the retail value of 1 day's production of electricity at this plant ?
A wire whose resistance si R120ohm is cut in 7 equally longpecies, which are then connected in parallel way. What is the resistance of the parallel contribution
a 100 sec long train (as measured at rest) moves in the x-direction with speed B=4/5. what is the position of the front of the train when the rear light is turned on, according to an observer on the ground
A machine shop has 120 equally noisy machines that together produce an intensity level of 92 dB. how many machines must be turned off
Suppose in the drawing that I1 = I2 = 42.4 A and that the separation between the wires is 0.0215 m. By applying an external magnetic field (created by a source other than the wires) it is possible to cancel the mutual repulsion of the wires. This ext..
A potter's wheel having a radius 0.45 m and a moment of inertia of 11.4 kg · m2 is rotating freely at 48 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and exerting a radially inward force of 74 N. Find the effe..
If you have 0.261 m3 of water at 25.0°C and add 0.107 m3 of water at 95.0°C, What is the final temperature of the mixture
Dan is gliding on his skateboard at 3.76m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.02m/s, How fast is Dan going as his feet hit the ground
Two cylindrical glass beads each of mass m = 44 mg are set on their flat ends on a horizontal insulating surface separated by a distance d = 3 cm. The coefficient of static friction between the beads and the surface is ?s = 0.2. The beads are then gi..
A weather vane initially at rest has a moment of inertia of 0.124 kg · m2 about itsaxis of rotation. A 25.0 g piece of clayis thrown at the vane and sticks to it at a point 19.0 cm from the axis.
Two containers contain the same gas at different temperatures and pressures, as indicated in the figure. The small container has a volume of 2 L, and the large container has a volume of 4 L.
A 100 meter length of steel changes temperature by 30 C during the course of a day. If the coeffcient of thermal expansion of steel is 12 parts per million per C, what is the change in length of the steel
A regional airline flight consists of two legs with an intermediate stop. The airplane flies 410 due north from airport A to airport B. What is the direction of the average velocity for the trip
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