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An electric space heater draws 15.0 A from a 120-V source. It is operated, on the average, for 5.0 h each day.
1. How much power does the heater use?
2. How much energy in kWh does it consume in 30 days?
3. At 11\cent per kWh, how much does it cost to operate the heater for 30 days?
A long, straight wire lying along the x-axis carries a current, i, flowing in the positive x-direction. A second long, straight wire lies along the y-axis and has a current i in the positive y-direction. What is the magnitude and the direction of the..
Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. One end of a rope is attached to the bus, while the other is tied around Magnus\'s 48 inch waist. If a force gauge placed half..
A mass attached to the free end of a spring executes simpleharmonic motion according to the equation y = (0.36 m) sin (83 t), What is the period of vibration
the mean distance between the center and the center of the moon is 3.84x108 m and the moon has an orbital period of
An ordinary drinking glass is filled to the brim with water (267.5 mL) at 3.0° C and placed on the sunny pool deck for a swimmer to enjoy. how much water will have spilled over the top of the glass
A playground merry-go-round has a radius of 4.20 and a moment of inertia of 255, What is the work done by the child
A line in the spectrum of a certain element is a doublet with wavelengths 526.4 and 527.2 nm. Calculate the minimum number of lines needed in a grating that will resolve this doublet in the second-order spectrum.
You have a wire with a current that points upwards. If you put a compass east of that wire, how would the magnitude and direction of the total magnetic field change
A battery charger is connected to a dead battery and delivers acurrent of 8.0 A for 5.4 hours, keeping the voltage across thebattery terminals at 12 V in the process. How much energy isdelivered to the battery?
An 80 N box initially at rest is pulled by a horizontal rope on a horizontal table. Find the friction force on the box if the pull is 25 N and the box remains at rest
If you had two bars of iron – one magnetized and one un-magnetized – and no other material at hand, how could you determine which bar was the magnet. Explain.
A 2.4 mm-diameter copper wire carries a 30 A current (uniform across its cross section). Determine the magnetic field at the surface of the wire
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