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Radio waves of wavelength 250 m from a star reach a radio telescope by two separate paths. One is a direct path to the receiver which is situated on the edge of a cliff by the ocean. The second is by reflection off the water. The first minimum of destructive interference occurs when the star is 25 deg above the horizon. Find what is the height of the cliff.
point charges of 7.50 are situated at each of three corners of a square whose side is 0.500 .what is the magnitude of
A 2.00-m-long rope has a mass of 0.100 kg, What is the frequency of the oscillator if the power transmitted is 120 W
A small button placed on a horizontal rotating platform with diameter 0.328 will revolve with the platform when it is brought up to a rotational speed of 45.0 rev/min , provided the button is a distance no more than 0.141m from the axis. a)What is..
A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.58). White light is incident normal to the film. Estimate the thickness of the acetone film
q1. you are designing a spherical tank to hold the water for a small village in a developing country. the volume of
The sport of gymnastics requires both impressive physical strength and extensive training for balance. The iron cross is an exercise performed on two suspended rings, which the gymnast grips with his hands
Find out the angle of the thread. If the locomotive can exert a constant pull of 8.36E+5 N, how long does it take to increase the speed of the train from rest to 80.7km/hr.
An air-filled parallel plate capacitor is connected to a battery and allowed to cahrge up Now a slab of dielectric materialis placed between the plates of the capacitor while he capacitor isstill connected to the battery. After this is done one wo..
A meter stick of aluminum is bent at its midpoint so that the two halfs are at right angles and the midpoint is at the origin of the x,y coordinate system
How long after the arrow was shot must the apple be dropped, in order for the arrow to pierce the apple as the arrow hits the tree.
An electron moves from point A where the potential is Va=+20.0kV to point B where the potential is Vb=- 40.0 kV. what was the change of the system's electric potential
Light traveling in henzene (n 1.50) is incident on the flat surface of a piece of plastic. What is refractive index of the plastic
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