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A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A light ray is incident from air onto the surface of a very quiet lake. what is the index of refraction of the water
A submarine is 304 m horizontally out from the shore and 126 m beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 232 m from the shore. If beam just strikes the top of a building..
A 2.25kg mass is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 20.6N is required to hold the mass at rest when it is pulled 0.215m from its equilibrium position, Calculate the total energy of the oscillating..
Problem on elevator
q1. in a skating stunt called as cracking-the-whip a number of skaters hold hands and form a straight line. they try to
An ac generator has a circular coil of 338 turns and diameter 0.200 m which rotates about an axis in the plane of the coil, What is the peak emf (in V) generated across the generator coil
The displacement of a wave traveling in the positive x-direction is y(x, t) = (3.5 cm)cos(1.7x - 129t), where x is in m and t is in s. What is the frequency of this wave
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -60cm. use ray tracing to determine the height of the image
A capacitor is made from two hollow, coaxial, iron cylinders, one inside the other. The inner cylinder is negatively charged and the outer is positively charged; the magnitude of the charge on each is 19.0pC. The inner cylinder has a radius of 0.3..
Waves from a radio station have a wavelength of 319 m. They travel by two paths to a home receiver 19.2 km from the transmitters. One path is a direct path, and the second is by re?ection from a mountain directly behind the home receiver.
Speedboat A negotiates a curve whose radius is 115 m. Speedboat B negotiates a curve whose radius is 194 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
You stand at the center of a carousel spinning at rate w. You throw a ball horizontally with velocity. how long does it take for the ball to strike the floor? At a point where the ball as position r = (x,y,z), what is the centrifugal force on the bal..
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