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A-6-nC point charge is located at the center of a conducting spherical shell. The shell has an inner radius of 2 m, an outer radius of 4 m, and a charge of +6 nC. (Let the radially outward direction be positive.)
Regarding the Earth and a cloud layer 750m above the Earth as the "plates" of a capacitor, calculate the capacitance. Suppose cloud layer has an area of 1 km2 and that the air between cloud and ground is pure and dry.
Two otherwise identical bodies have temperatures of 330K and 3000K , respectively. By what factor does its emission exceed the emission of the other body
A container of hot water at 80 degrees cools to 79 degrees in 15 seconds while it is placed in a room that is t 20 degrees. Use newton's law of cooling to estimate the time it will take for the container to cool from 50 degrees to 49 degrees.
An aquarium contains a 5-cm layer of water (n = 1.33) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the air is 30, what is the angle of refraction into the carbon tetrachloride?
A gas expands while 502 J of energy is added to it as heat. The expanding gas does 422 J of work on its surroundings.
A downward force of 60 N is exerted on the top of the book by a hand pushing down on the book. What is the gravitational force acting on the book
A solid spherical ball of mass 2.74 kg and radius 0.15 m rolls along a smooth, level surface with a speed of 2 m/s. How far up the plane does the ball go
A group of swimmers is resting in the sun on an off-shore raft. How fast are the waves moving
A flagpole consists of a flexible, 7.02 m tall fiberglass pole planted in concrete. What is the lowest frequency standing wave that can be formed on the flagpole
A bicycle and its rider together has a mass of 78 kg. What power output of the rider is required to maintain a constant speed of 5.0 m/s (about 11.2 mph) up a 5.0% grade
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 45 rad. What is the instantaneous angular velocity of the disk at the end of the 5.0 s
a person exerts a tangential force of 37.2 n on the rim of a disk-shaped merry-go-round of radius 2.70 m and mass 158
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