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Show that the time-average value of the magnitude of the Poynting vector given by (4.68) is one-half its peak value. For an antenna radiating a time-average power of 150 kW, find the peak value of the electric field intensity at a distance of 100 km from the antenna. Assume the antenna to be radiating equally in all directions.
What is the minimum thickness of the film. what is the magnitude of the average acceleration of the ball through out this time interval.
It is crash-test-dummy Ed's first day on the job. He (& his 50-kg mass) gets to try out the new 1,200-kg Porsche 911. He has to drive it into a brick wall.The Porsche & Ed are moving 30 m/s when they collide with the wall, with an impulse time of..
A high-voltage transmission line with a resistance of 0.32 /km carries acurrent of 980 A. What is the power loss due to resistance in the line
A metal cube with sides of length a is moving at velocityv0y^ across a uniform magnetic fieldB0z^. The cube is orientated so that four ofits edges are parallel to its direction of motion (i.e., the normalvector of two faces are parallel to the direct..
A 75 kilogram shell is fired with an initial speed of 125 m/s at an angle 55o above horizontal. find how far from the launch point does the lighter fragment land
Two objects attract each other gravitationally with a force of 2.5×10-10 while they are 0.60 apart. Their total mass is 5.0. Find out their individual masses.
Assume the electric field near the southwest corner of your table is uniform at 3x10^4 N/C south. We assign zero as the value of electric potential at the corner. What is the potential 2 cm south of the corner?
A steam turbine receives steam at a pressure of 1MPa, 300degC. The steam leaves the turbine at a pressure of 15kPa. The work output of the turbine is measured and is found to be 600kJ/kg of steam flowing through the turbine.
question a luminous object is 3.40m from a wall. you are to use a concave mirror to project an image of the object on
As a positron moves through a region of space, its speed increases from 2.80 X10^6 m/s to 8.00 X10^6 m/s. The electric force is the only force acting on the positron. Across what potential difference did the positron travel?
The water skier has a mass of 73 kg. Find the magnitude of the netforce acting on the skier
q1. a projectile is launched from earths surface at a certain initial velocity at an angle above the horizontal
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