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A LASIK vision correction system uses a laser that emits 10 ns-long pulses of light, each with 2.5 mJ of energy. The laser is focused to a 0.90 mm diameter circle.
1) What is the average power of each laser pulse?
(W)
2) What is the electric field strength of the laser light at the focus point?
(N/C)
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×106N, What is the total work done by the two tugboats on the supertanker
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A 0.200H inductor is connected in series with a 85.0? resistor and an ac source. Derive an expression for the voltage vR across the resistor
An uncharged 20 F capacitor is connected to a power supply set to 10 V. How much charge flows onto the capacitor plates, how much more charge flows onto the plates
A painter weighing 630 N climbs to a height of 5.0 m on a ladder. How much work does it take? What is the increase in the potential energy
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