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Lightning occurs when there is a flow of electric charge (principally eletcrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt ia about 20,000 C/s; this lasts for 100μs or less. How much charge flows between the groud and the cloud in this time? How many electrons flow during this time?
A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 4.50 m from the bulb, find out (a) the average intensity of the light, (b) the rms value of the electric field, and (c) the peak value of t..
Calculate this temperature.
A 63.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event. If he doubles his speed to reach the finish line, by what factor does his kinetic energy change
A 2kg block is moving to the right at 1.0m/s just before it strikes and sticks to a 1.0 kg block initially at rest
A person drops an object from a bridge spanning a rushing river, falling a distance h before hitting the water. what would be the object's speed at the moment of impact
An immersible heater coil is to be designed to heat an insulated container with 4 liters of distilled water from 20 degrees to 50 degrees C in less than 30 minutes. what is the resistance of the heating coil
The water is near freezing in temperature. Typically a human can only swim in such water for about 5 minutes before hypothermia sets in. Calculate the time the explorer spends in the water if the river is 87.3 feet wide
An uncharged capacitor and a resistor are connected in series to a source of emf. If = 12.00 V, C = 17.0 µF, and R = 100 ?, estimate the maximum charge on the capacitor
Find the angle of the first order maximum. what horizontal distance does it travel before it lands on building.
A Nordic jumper goes off a ski jump at an angle of 9.8° below the horizontal, traveling 108 mhorizontally and 64.3 m vertically beforelanding. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ra..
A diver completes somersaults during a 2.1 sec dive. What was the diver's average angular speed during the dive
The flux through a loop is given by ?m = (0.20t 2 - 0.58t) , where ?m is in webers and t is in seconds. Find the induced emf as a function of time
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