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an object is placed in front of a symmetrical convex lens of with refractive index 1.5 and radius of curvature 40 cm . the surface of the lens further away from the object is silvered.under auto collimation condition, the object distance is
A particle is thrown over a triangle from one end of horizontal base and grazing the vertex
,it falls on other end of base. If "a" and "b" are base angles and "y" the angle of projection , prove tany = tana + tanb
a quadrupole consists of two dipoles that are close to each other, the effective charge at the origin is -2q and the other charges on the y-axis at y=a and y=-a are are +q each. (1) find the electric field at a point on the x-axis far away so that x>>a. (2) find the electric field on the y-axis far away so tha y>>a
What causes matter to rotate/spin/orbit? All I can find is the statement that in space particles of dust/gas/matter contract into a spinning disk due to gravity (to form stars, solar systems, galaxies etc.), with no explanation as to why the spin. I see a lot about the conservation of angular momentum, but these discussions all presume that the 'spin' already exists. What caused the spin in the first place? Shouldn’t gravity simply attract particles of dust, gas or matter together along a straight path till they collide, as a magnet does to a paper clip? The magnet does not make the paper clip revolve around it, and if I fall off of a building, I don’t spin around the earth. I fall in a straight path till I collide with the earth. What am I missing?
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a body thrown vertically upward such that it crosses the same height after 2 sec and after 8sec what is the value of the mentioned height
A body of mass m is thrown with velocity υ at angle of 300 to the horizontal and
another body B of the same mass is thrown with velocity υ at an angle of 600 to the
horizontal. Find the ratio of the horizontal range and maximum height of A and B?
Calculate the maximum horizontal distance travelled by a ball thrown with a velocity
Of 40m/s without hitting the ceiling of an auditorium of height 25m.
A convex mirror has a radius of 20cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear?
: water flowing along a horizontal pipe has a speed of 2.4m/s and a pressure of 4.5 atm. further along the pipe narrows so that the cross sectional area decreases by a factor of 6.8. what is the pressure in the narrow section?
The mass attached to a vibrating string is increased four times. What is the affect on the time period and frequency of oscillation of the mass-spring system?