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a small light source having uniform luminous intensity of 20 candela is situated at the centre of a spherical surface of radius 2 m .calculate
1. the luminous flux
2. illuminance on the spherical surface.
A block of wood with volume V floats in waterwith 0.67V submerged.In oil the block floats with 0.85V of its volume submerged. Find the density of the wood. Find the density of the oil.
A firkin is an old British unit of volume equal to 9 gallons. How many cubic meters are there in 6.06 firkins
A 1,200-N crate rests on the floor. How much work is needed to move it at constant speed 4.8 m along the floor against a friction force of 240 N? How much work is needed to move it at constant speed the same distance vertically?
a spacecraft is in orbit around a planet. the radius of the orbit is 3.1 times the radius of the planet which is r
An electron is trapped in a one-dimensional infinite potential well that is 310 pm wide; the electron is in its ground state. What is the probability that you can detect the electron in an interval of width δx = 5.0 pm centered at x = 34 pm?
You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the empire state building. Before the state legislature votes on funding for the project.
Assume that NASA fails in its attempt to put a communications satellite into geosynchronous orbit. If the orbit is too big, what apparent motion will the satellite have to an observer standing on the rotating Earth?
A hollow spherical shell with mass 1.75kg rolls without slipping down a slope that makes an angle of 35.0 degree with the horizontal. Find the magnitude of the frictional force acting on the spherical shell
A skateboarder shoots off a ramp with a velocity of 6.4 m/s, directed at an angle of 55° above horizontal.
A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. find the speed of the ball just before it lands
A charge of 80nC is uniformly distributed along the x axis from x = 0 to x = 2.0 m. Determine the magnitude of the electric field at a point on the x axis with x= 8.0m
when laser light of wavelenght 633.8nm passes through a diffraction grating, the first bright spot occurs at +- 18.6 degrees from the central maximum. At what angles do the third bright spots occur
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