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In the medium wave radio band, waves sent out by the transmitter, T, may reach the receiver, R, by two routes: the ground wave travels direct, while the sky wave is returned to earth by the layers of ionized gas collectively called the ionosphere. 1) The height h of the ionosphere may vary over a few seconds. Explain how the presence of the 2 waves can cause the signal at the receiver to rise and fall in intensity as h varies. 2) If d =120 km, and h=80 km at a particular moment, determine the path difference for direct and reflected waves. 3) Hence find, for radio waves of wavelength 1500 m, whether the interference is constructive, destructive or none of the above
Two identical conducting spheres each having a radius of 0.500 cm are connected by a light 1.70 m long conducting wire, Determine the tension in the wire
consider a carousel 32 feet in diameter. this carousel takes 11 s to accelerate from rest to its operating speed of
The index of refraction for red light in water is 1.331, what are the underwater angles of refraction for the blue and red components of the light
In a Rotor-Ride at a carnival, riders are pressed against the inside wall of a vertical cylinder 2.00 m in radius rotating 1.10 revolutions per second when the floor drops out. What is the speed of a rider in m/s
A block of wood with volume V floats in water with 0.68V submerged. determine the density of the oil and wood
A gymnast of mass 55.0 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value for the acceleration of gravity.
A laptop communicates with a router wirelessly, by means of radio signals. compute how many bits are downloaded to the laptop in the time it takes the wireless signal to travel from the router to the laptop
Inside the cylinders of a diesel engine, the mixture of fuel and air is compressed to about 1/20 of its original volume. Though diesel engines have no spark plugs to ignite this mixture, it ignites anyway because...
two point charges of 20.0 oc and - 8.00 oc are separated by a distance of 20.0 cm. what is the intensity of electric
At a shooting competition, a contestant fires and a 13.0 bullet leaves the rifle with a muzzle speed of 130. what is the magnitude of the impulse on the target
A uniform plank of length 2m and mass 29kg is supported by three ropes, as indicated by the blue vectors. Find the tension in each rope when a 690N person is 0.500m from the left end.
Antenna A and Antenna B emit coherent radio waves. Antenna A is 125m due north of Antenna B. Constructive interference occurs 175m due east of antenna B. Determine the three longest possible wavelengths being emitted by the antennae.
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