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A source of light, spreading out radially froma point source produces a sinusoidal electric field of amplitude of 6.88 V/m at a radial distance of 42.0m from the source. We want to determine the power output form the source.
a) Write an equation relating the average energy flow rate to the maximum value of E for a traveling electromagnetic wave.
b) Write an equation relating the total pwoer radiating out from a source (spherically symmetrical) to the intensity I at a radial distance r from the source.
c) What is the source's power output?
d) What is the magnetic field amplitude at twice the radial distance, 84.0m?
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 15 m/s at an angle of 32° above the horizontal. (a) How long does it take for the ball to reach the wall if it is 4.2 m away? ..
A motorcycle has a constant speed of 20.9 m/s as it passes over the top of a hill whose radius of curvature is 125 m. Find the magnitude of the centripetal force
A 0.300 kg hammer is moving horizontally at 8.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. What was the average force exerted on the nail
A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?
A charge 5.05nC is placed at the origin of an xy-coordinate system, and a charge -1.99nC is placed on the positive x-axis at x = 3.96cm. A third particle, of charge 5.96nC is now placed at the point x = 3.96 cm, y = 3.04cm.
A boy of mass 60.8 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 9.5 m above the net. What is the average force on the net due to the boy during the interval
As a city planner, you receive complaints from local residents about the safety of nearby roads and streets, calculate the miminim and maximum braking distance needed to ensure that all vehicles traveling at the posted speed limit can stop before r..
In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular velocity of 6.00 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position.
A 125 g mass starts from rest at the origin (at t = 0) and moves with a velocity of v = 2 t i - t3 j (t is in second and v is in m/s). Find the magnitude of the acceleration of the mass at t= 2 second
In an RLC series circuit the phase angle between thecurrent and voltages is 30 degrees. If the AC frequencydoubles, what is the resulting phase angle
Here are the familiar pair of carts connected by a spring. What are the relative speeds of the carts when the spring is released?
an electric current is given by the expression i t 100 sin 120pit where i is in amperes and t is in seconds. what is
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