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Consider the Earth and a cloud layer 700 meter above the planet to be the plates of a parallel-plate capacitor.
(a) If the cloud layer has an area of 4.0 km2 = 4000000 m2, determine what is the capacitance?
F
(b) If an electric field strength greater than 3 x 106 N/C causes the air to break down and conduct charge (lightning), obtain the maximum charge the cloud can hold?
C
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 hz that can travelup to 10 km. The intensity level of these sounds can reach98 dB, measured a distance of 4.5 m from the source.
A pole-vaulter approaches the takeoff point at a speed of 8.31 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the vaulter can clear the bar.
The drawing shows a wire composed of three segments, AB, BC, and CD. There is a current of I = 2.9A in the wire. There is also a magneticfield B (magnitude= 0.24 T) that is the same everywhere and pointsin the direction of +z axis.
A 70.0 kg box is pulled by a 500N force at an angle of 30degrees to the horizontal. The friction is 30.0 N. Write the Newton's 2nd Law equations for the sum of the forces inboth the X and Y direction. What is the acceleration of the box?
To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest. find the average induced emf in the coil during this time interval
A spaceship of proper length 308 m takes 0.76 µs to pass an Earth observer. Determine the speed of this spaceship as measured
A Hollow sphere of mass 6 kg and radius 1.2 meters is rolling without slipping on a horizontal surface with a velocity of 2 m/s. It collides perfectly elastically with a Solid sphere of mass 10 kg and radius .8 meters initially at rest. Find the vf a..
A man normally consumes 8.4 MJ of food energy per day. He then begins running a distance of 9four times per week. how much more food energy should he consume daily in order to maintain constant weight
One end of an insulated metal rod is maintained at 100 , while the other end is maintained at 0 by an ice-water mixture. Find the thermal conductivity of the metal
The position function x(t) of a particle moving along an x axis is x = 4.0 - 4.5t2, with x in meters and t in seconds. 1) At what negative time does the particle pass through the origin? 2) At what positive time does the particle pass through the ..
In an old house, the heating system uses radiators, which arehollow metal devices through which hot water or steam circulates. what is the temperature of the newly painted radiator
A bead of mass m = 3.10 kg is released from point A and slides on the frictionless track as shown in the figure below. The height of A is ha = 6.70 m. Determine the net work done by the force of gravity in moving the bead from A to C
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