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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 500m to be the other plate. Assume the surface area of the cloud to be the same as the area of a square that is 0.80km on a side. (Dielectric strength of air is 3.0 x 10^6 V/m). What is the capacitance of this capacitor? Express your answer using two significant figures. How much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results? Express your answer using two significant figures.
A 17g particle is moving to the left at 24m/s. How much net work must be done on the particle to cause it to move to the right at 40 m/s.
A ski jumper starts from rest 50.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal, What is her speed when she leaves the track
To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. What is your reaction time
As a baseball is being caught, its speed goes from 43 to 0 m/s in about 0.003 s. What is the baseball's acceleration in m/s2
A plane is headed due west with an air speed of 224 m/s. Find the velocity of the plane relative to the earth
Two small metallic spheres, each of mass m = 0.198 g, are suspended as pendulums by light strings of length L as shown in the figure below. The spheres are given the same electric charge of 7.4 nC, and they come to equilibrium when each string is ..
A satellite moves in a circular orbit around Earth at a speed of 5918 m/s? Determine the period of the satellite's orbit
An ocean liner leaves New York City and travels 20.0° north of east for 199km. How far east and how far north has it gone? In other words, what are the magnitudes of components of ship's displacement vector in the following directions.
Presume the needle moves 7.5 mm from its highest to its lowest position and it makes 26 stitches in 9.1 s. What is the highest needle speed.
A 25- sample of an ideal gas with is at 250 and 50. The gas is compressed isothermally to one-third of its original volume, then heated at constant volume until its state lies on the adiabatic curve that passes through its original state, and then al..
A child goes down a playground slide with an acceleration of 1.30. Find out the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 34.0 below the horizontal.
Calculate the diameter of a 1.51 cm long tungsten filament in a lightbulb if its resistance is 0.507 ?
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