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A heater runs on an AC voltage of 120 V and draws a power of 26 W. If this heater were run instead on a DC voltage of 70 V, how much current would flow through the heater? Hint: The heater can be modeled as a resistor.
Light is traveling in an optical medium with a refractive index of 1.55 and is incident on an interface with air. What is the critical angle for light traveling in this optical medium
A heat engine is to be built to extract energy from the temperature gradient in the ocean. what is the maximum efficiency such an engine can have
Commercial electric power in most of Europe is rated 240Vrms and 50Hz. (in the US the system is 120Vrms and 60 Hz.), Determine the rms-current drawn by thus bulb
a 2.0 nc charge is placed on the x-axis at x=-3.0cm another 2.0nc charge is placed on the x-axis at x=3.0cm, What is the potential at the origin
A wheel with a tire mounted on it rotates at the constant rate of 2.87 times a second. find the tack's tangential speed
At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire?
Write down an equation for the radial component
You're in a uniform electric field of magnitude 300N/C, compute the potential difference if you travel 1 cm in the direction of the field
Red light of wavelength 671.0 nm produces photoelectrons from a certain photoemissive material. What is the material's work function
suppose a random sample of 49 is selected from a population with a standard deviation of 14. if the sample mean is 125
An LC circuit is built with a 10mH inductor and an 8.0pF capacitor. The capacitor voltage has its maximum value of 45V at t=0s. How long is it until the capacitor is first fully discharged
The label on a 12.0-V truck battery states that it is rated at 150.0 A·h (ampere-hours). Treat the battery as ideal. How much electric energy can the battery supply
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