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An electromagnetic wave is travelling in vacuum along the horizontal or x-axis. It consists of an electric field of peak strength 2.1 x 10-5 Vm-1 in the vertical direction or z axis and a magnetic field.
a) Find what is the speed v?
b) Obtain the peak strength of the magnetic field component?
c) If the E were momentarily vertical (+z) and the velocity is in the +x direction, find what direction is B at that instant?
d) Find what are the direction of E, B and v one half periods later?
e) Find the magnitude of the associated pointing vector?
A man eats a dessert that contains 170 Calories. (1 Calorie = 4186 J), Find how many hours would it take her to emit anet radiant energy from her body that is equal to the energy contained in this dessert
An elastic cord is 63.9 cm long when a weight of 71.1 N hangs from it but is 88.9 cm long when a weight of 184 N hangs from it. What is the "spring" constant k of this elastic cord
The water supply of a building is fed through a main pipe 6.00 cm in diameter. A 3.00 cm diameter faucet tap, located 1.00 m above the main pipe, What is the speed at which the water leaves the faucet
A 5kg mass starts from rest and slides down on an inclined plane, hits a bumper at the bottom of the inclined plane and bounces back up the inclined plane and comes to rest again. During the collision with the bumper, 0.7j of energy is lost.
In a period of 1.4 s, 5.0 1023 nitrogen molecules strike a wall of area 8.9 cm2. find the pressure exerted on the wall
A student sitting on a frictionless rotating stool has rotational inertia 0.92kg?m2 about a vertical axis through her center of mass, Ignoring her arm mass, what's her new rotational velocity
Two sinusoidal waves traveling in opposite directions interfere to produce a standing wave with the following wave function, Determine the wavelength of the interfering waves
A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction towerat 293 K and leaves at 350. K at a rate of 4200. kgs-1.
The velocity of the transverse waves produced by an earthquake is 4.29 km/s, while that of the longitudinal waves is 7.5075 km/s. How far away was the earthquake
An ethernet cable is 4.15 m long and has a mass of 0.195 kg. A transverse pulse is produced by plucking one end of the taut cable. What is the tension in the cable
careful measurements of local variations in the acceleration due to gravity can reveal the locations of oil deposits.
a man is trying to get his car out of mud on the shoulder of a road. He ties one end of a rope tightly around the front bumper , What is the magnitude of the force on the car from the rope
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