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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.
Two stationary positive point charges, charge 1 of magnitude 3.55 and charge 2 of magnitude 2.00 , are separated by a distance of 30. An electron is released from rest at the point midway between the two charges, and it moves along the line connec..
Heather and Jerry are standing on a bridge 51 above a river. Heather throws a rock straight down with a speed of 12. Jerry, at accurately the same instant of time, throws a rock straight up with the same speed. Ignore air resistance.
An 7.40-cm-diameter, 300g solid sphere is released from rest at the top of a 1.90-m-long, 20.0? incline. It rolls, without slipping, to the bottom. What fraction of its kinetic energy is rotational
a 35.0 cm diameter coil consists of 30 turns of circular copper wire 2.0 mm in diameter. a uniform magnetic field
a spring is pressed against a wall so that it is compressed by 0.25 m (ie it is 0.25 m shorter than its equilibrium length). what is the speed at which the spring leaves the wall
An Electronic lift can raise a 216 kg mass a distance of 25.7 m in 5.0 seconds. What was the work done by the lift
An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid,
What is Seth’s angular position at = 3.2 measured counterclockwise from the top? Give your answer as an angle in degrees between 0 and 360 degrees.
A 380-N, uniform, 1.50 m bar is suspended horizontally by two vertical cables at each end. A small object of weight 520 N is placed distance 0.5 m from the cable A. What is the tension in cable A.
A uniform disk of mass m=0.400 kg and radius R=20.0 cm is pinned to the wall near its rim. Find the angular frequency of oscillation if the disk is set swing back and forth
a golfer hits her tee-shot due north towards the fairway. her shot has an initial velocity of 60 ms. a 15 ms wind is
question1the surface charge density on an infinite charged plane is - 2.00 times 10 - 6rm crm m2 . a proton is shot
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