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An energy efficient light bulb, taking in 28.0 W of power, can produce the same level of brightness as a conventional light bulb operating at power 100 W. The lifetime of the energy efficient bulb is 10000 h and its purchase price is $17.0, whereas the conventional bulb has a lifetime of 750 h and costs $0.420 per bulb. Decide the total savings obtained by using one energy efficient bulb over its lifetime as opposed to using conventional light bulbs over the same time interval. Suppose an energy cost of $0.80 0 per kilowatt-hour.
A 0.182 ?F capacitor is connected to a 240-V rms AC source at 45.4 Hz. Find the reactance of the capacitor. What is the rms current through the capacitor
The resistance and the magnitude of the current depend on the path that the current takes. The drawing shows three situations in which the current takes different paths through a piece of material. Each of the rectangular pieces is made from a mat..
What is the frequency of light that has the wavelength in water of 788 nm if the refractive index for this light is 1.33.
consider an ideal refrigeration cycle that has a condenser temperature of 40 degree c and an evaporator temperature of
A circular loop of wire lies flat on a level table top in a region where the magnetic field vector points straight upward. As viewed from above, in what direction does the induced current flow in the loop of wire
Use the table shown below to determine the energy in eV of the photon emitted when an electron jumps down
A friend in a spaceship travels past you at a high speed. He tellsyou that his ship is 22 m long and thatthe identical ship you are sitting in is 19 m long. According to your observations, how long is your ship
The average intensity of light emerging from a polarizing sheet is 0.722 W/m2, Obtain the angle that transmission axis of polarizing sheet makes with the horizontal
A cart mass M moves on a frictionless track. It is attached to a string, which goes over a pulley wheel & has a mass m hanging from it. At t=0 s the cart starts from rest & accelerates. Find the tension in the sting & acceleration of the cart.
A mechanic jacks a car up to an angle of 6.0 degree to change the front tires. The car is 2.9 meter long and has a mass of1130 kilogram. Find the torque exerted by the car around the back wheels
In some places, insect "zappers," with their blue lights, are a familiar sight on a summer's night. how many turns are in the secondary coil
a particle with charge 9.49times10-8 is moving in a region where there is a uniform magnetic field of 0.470 in the
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