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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 470m 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 \times 10^6 \; \rm V/m)
What is the capacitance of this capacitor?
How much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results?
A(n) 51.6 cm length of wire when used as a resistor has a resistance of 0.00668 ?. The ends of the wire are connected to form a circular loop, At what rate is thermal energy generated in the wire
A spherical balloon is made from a material whose mass is 3.00 kg. The thickness of the material is negligible compared to the 1.4 m radius of the balloon. Find the absolute pressure of the helium gas
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A 1500kg car starts from rest and drives around a flat 52-m-diameter circular track. at what time does the car begin to slide out of the circle
in a 10ft^2 room wiyh no window and no doors . The air in the room is 79% N(sub2) and 21% O(sub2). What is the weight of the air
A 130g oscillator has a speed of 124cm/s when its displacement is 2.10cm, What is the oscillator's maximum speed
A Light-Dimmer Circuit The intensity of a lightbulb with a resistance of 140 Ohms is controlled by connecting it in series with an inductor whose inductance can be varied from L=0 to L=Lmax. What is the average power dissipated in the lightbulb whe..
A log floats in a river with 1/5 of its volume above the water. Density of water is 1000 kg/m, how much of the volume is now above the water
When a 24.0-? resistor is connected across a 12.0-V battery, a current of 482 mA flows. What is the resulting terminal voltage of the battery
A sanding disk with rotational inertia 2.4 10-3 kg•m2 is attached to an electric drill whose motor delivers a torque of 8 N•m about the central axis of the disk. What are the following values about the central axis at the instant the torque has been ..
A 89.1-kN car is travelling at 73.1 mph when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
A 2.5hp electric motor on a water well pumps water from 10m below the surface. The density of water is 1.0 kg per liter. How many liters of water does the motor pump in 2.0hr
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