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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 long distance power line is to carry 175 megawatts (1.25x10^8W) of alternating current power at distance of 15.0km at a peak voltage of 1.00MV and a frequency of 60Hz.
The power P of an Electric circuit varies jointly with resistance , R and with the square of the current, I. find the power if the current is 2.00 A and the resistance is 2.00 ohms
A 6.0-cm-diameter circle lies in the xz-plane in a region where the electric field is E =(1200i^+1200j^+1200k^)N/C
An electric motor can accelerate a Ferris wheel of moment of inertia I = 19500 kg·m2 from rest to 9.4 rev/min in 12.0 s, Determine the torque generated by the motor to bring the wheel to 9.4 rev/min
The location of a particle (in m) is given by its x, y and z coordinates as function of the time, calculate the y-component of the average velocity between t = 3.00 s and t = 12.00 s
The coil is flipped so its plane is vertical to the magnetic field in 0.050 s. What is the magnitude of the average induced emf.
A pump flows 100 gal/min of water. The inlet pressure is 0 psig and the outlet pressure is 20 pisg. How much electricity (kW) is required to power the motor
In a 261-turn automobile alternator, the magnetic flux in each turn is ?B = (2.62E-4 T*m2) cos(?t), determine the maximum emf in the alternator
A spring of force constant k=2.5*10^2 N/m is suspended form a rigid support. An object o mass 1.00 kg is attached to the uns How far below the starting point is equilibrium position for the object.
The measured conductivity of Cu at Room Temperature is 5.88 x 107/ohm.m and the Fermi energy for Cu is 7.03 eV, Find the mean free path( mfp) of electrons in copper
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.60s , the rate increases steadily to 5.95rev/s . What's the pulley's angular acceleration
An airplane has a mass of 1.8×10^6 kg , and the air flows past the lower surface of the wings at 94 m/s .f the wings have a surface area of 1300 m^2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
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