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The power crossing a surface perpendicular is equal to the intensity at the surface times the area of the surface. Since the source emits uniformly in all directions, the light intensity is the same at all points on the imaginary spherical surface. Moreover, the light crosses this surface perpendicularly. S = c?0E2 relates the average light intensity at the surface to its rms electric field strength (which is known), and the area of the surface can be found from a knowledge of its radius. A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 4.85 m from the bulb, determine (a) the average intensity of the light, (b) the rms value of the electric field, and (c) the peak value of the electric field.
Consider a heavy particle of mass m is place at the top (on the outside side, not inside) of a vertical hoop of radius R and mass M. find the location of the hoop center X as a function of angle theta of the falling particle
A planet orbits a star once every 3.44 multiply.gif 107 s in a nearly circular orbit of radius 1.46 multiply.gif 1011 m. determine the tangential speed of the planet
Illustrate what is the magnitude of the change in momentum of the ball while in contact with the bat if the ball leaves with a velocity of (a) 18 m/s, vertically downward, and (b) 18 m/s, horizontally back toward the pitcher?
In some places, insect "zappers," with their blue lights, are a familiar sight on a summer's night. how many turns are in the secondary coil
What are the following values about the central axis at the instant the torque has been applied for 195ms? The angular momentum of disk.
A 9.8 V battery is connected to a bulb whose resistance is 1.4 . How many electrons leave the battery per minute
A flat sheet of crystalline quartz has a thickness of 3.7cm. It is on top of a flat sheet of diamond that has a thickness of 2.6cm. Light strikes the crystalline quartz vertically and travels through it and then through the diamond.
question1an unmarked police car travelling a constant 93 is passed by a speeder. accurately 1.20 s after the speeder
A block of weight 36.1 N is hanging from a rope. The tension in the rope is 48.5 N, pulling upward on the block. find the magnitude and direction of the acceleration of the block
A spaceship, traveling at 0.56c towards a stationary enemy station, What is the speed of the projectile relative to the station
For safety in climbing, a mountaineer uses a nylon rope that is 60 m long and 1.0 cm in diameter. When supporting an 88 kg climber, the rope elongates 1.80 m. Find its Young's modulus.
A block of unknown mass is attached to a spring of spring constant 6.1 N/m and undergoes simple harmonic motion with an amplitude of 9.5 cm. Calculate the mass of the block
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