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Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 680m to be the other plate. Assume the surface area of the cloud to be the same as the area of a square that is 0.40km on a side. (Dielectric strength of air is 3.0*10^6 V/m) A)What is the capacitance of this capacitor? B) How much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results?
An object moving with uniform acceleration has a velocity of 16 cm/s in the positive x direction when its x coordinate is 3 cm. If its x coordinate 1 s later is -5 cm, what is its acceleration.
David is driving a steady 24 when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70 at the instant while David passes. How far does Tina drive before passing David.
The cylindrical space station, 200 m in diameter rotates in order to give artificial gravity of 3.0 g for the occupants. How much time does it take, in seconds, to complete one revolution.
Find out the radial acceleration of the ball during its circular motion.
At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, and lowers the container into the hold of the freighter, which is 10 m below the level of the dock. The acceleration of gravity is 9.8 m/s2. Neglect fri..
determine the length of the wire.
A tiger leaps horizontally from a 5.90 m high rock with a speed of 4.10 m/s. How far from the base of the rock will she land.
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 37.5 m/s and initial angle of 38.4° with respect to the horizontal.
To see that it is easy to break a thighbone when falling in this fashion, find out the greatest distance through which his center of gravity can fall without his breaking a bone.
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter-deep lake. When the sun is 30° above the horizon, how long will the shadow of the mast be on the bottom of the lake?
compute the magnitude of the magnetic force exerted on it.
Two speakers, one directly behind the other, are each generating a 374-Hz sound wave. What is the smallest parting distance between the speakers that will generate destructive interference at a listener standing in front of them? Take the speed of so..
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