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A point charge Q=10^-9 coulombs is placed at the centre of a dielectric sphere of radius R=10cm. The relative permittivity of the dielectric is 2. Find the volume polarization density within the dielectric and the surface polarisation density on the surface of the sphere.
A recently developed method to study brain function is to produce arapidly changing magnetic field within the brain. When thistechnique, known as TMS, is applied to the prefrontal cortex, forexample, it can reduce a person's ability to conjugate v..
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0315 s, find the vertical components of the launch velocity
find out the initial velocity of the ball. How fast will the electron be moving when it is very far away.
A standing observer perceives a train whistle to have a frequency of 300 Hz. calculate the frequency of the sound waves emitted from the train
a ranger in a national park is driving at 49 kmh when a deer jumps onto the road 67 m ahead of the vehicle. after a
Someone points out that a ball, if released from rest on a hill, will roll down the hill with increasing momentum. explain the Law of Conservation of Linear Momentum
The velocity of the transverse waves produced by an earthquake is 6.93 km/s, while that of the longitudinal waves is 11.3652 km/s. How far away was the earthquake
One recent study has shown that x rays with a wavelength of 0.0050 nm can produce significant numbers of mutations in human cells. Assuming that the bond energy holding together a water molecule is typical, use table 25.1 in the textbook to estimate ..
Consider the equation for heat transfer through a wall. Based on this, describe two simple ways you could modify your home to decrease the rate at which heat is lost through your walls.
On the TV show Top Gear's Africa special this season, the three hosts decided to build a raft out of wood, How think did the raft need to be
Water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, What is the speed of the flow at the second point
A resistance R and a 3.4-H inductance are in series across a 60-Hz ac voltage. The voltage across the resistor is 34 V and the voltage across the inductor is 39 V. Assume that all voltages in this problem are rms voltages. (a) What is the resistance ..
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