If a man weighs 90 N on the surface of the Earth, then the height above the surface of the earth of radius R, when the height is where the weight is 30N is

A.0.73R

B. R/√3

C.3R

D.√3R

Anonymous User Physics 11 Nov, 2019 1 Answer 117 views


Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.

Anonymous User Chemistry 10 Nov, 2019 1 Answer 115 views








A compound is composed of two elements A and B, element A constitute f.c.c. lattice, while B occupy all the tetrahedral voids, in this way another simple cubic is constituted by element B, inside the fcc unit cell of element A. If all the points/particles along any one edge of inner cube of every unit cell, are missing then what is the new empirical formula of the compound?

Anonymous User Chemistry 29 Oct, 2019 1 Answer 917 views


A block of mass 2 kg is attached to one end of a massless rod of length  . The rod is fixed to a horizontal plane at the other end such that the block and rod are free to revolve on a horizontal plane. The coefficient of friction between the block and surface is 0.1. Block is made to rotate with uniform speed by applying a constant external force in tangential direction on the block. The work is done by external force when the rod rotates by 90 degree is

Anonymous User Physics 25 Oct, 2019 1 Answer 1011 views







In a hypothetical concept, electron of mass me revolveds around nucleus due to gravitational force of attraction between electron and proton of mass mp. If the radius of circular path of electron is r then the speed of electron is ?

Anonymous User Physics 15 Oct, 2019 0 Answer 112 views







Two identical discs of mass m and of radius R touch each other and move with the same velocity perpendicularly to the line segment which joins their centres of mass, along the surface of a horizontal smooth tabletop. There is a third disc of mass M and of radius R at rest, at a point on the perpendicular bisector of the line segment joining the centres of mass of the two moving discs as shown in the figure. The two moving discs collide elastically with the third one, which is at rest. There is no friction between the rims of the discs. What should the ratio of M/m be in order that after the collision the two discs of mass m move perpendicularly to their initial velocity?

 

Anonymous User Physics 09 Oct, 2019 1 Answer 120 views

Ram travels towards east covering 5 km. He takes a left turn and travels 10 km more. Then, he takes a right turn and travels another 5km and finally takes a right turn to cover 10 km. How far is he from his original position?

Anonymous User Maths 09 Oct, 2019 1 Answer 108 views


A WIRE HAS LINEAR RESISTANCE P. FIND RESISTANCE R B/W PoinT A AND B IF SIDE OF LARGER SQUARE IS D

Anonymous User Physics 06 Oct, 2019 0 Answer 89 views


10 uc charge is uniformly distributed over thin ring of radius 1m a particle of mass 0.9 g charge 1uc is placed on axis of ring it is displaced towards centre then time period is

Anonymous User Physics 02 Oct, 2019 1 Answer 92 views

1 cm3 of water at its bp absorbs 540 cal of heat to become stream with vol of 1671 cm3 if atmpressur1.013 *10^5 n/m2 and mechanical equivalent of heat =4.19 j/cal energy spent in this process in over coming intermolecular forces

Anonymous User Physics 01 Oct, 2019 1 Answer 88 views

A cylindrical rod with one end in a stream chamber and other end in ice cause melting of 0.1 gm of ice/sec. If the rod is replaced with another rod of half the length and double the radius of first and thermal conductivity of second rod is 1/4 that of first, find the rate of ice melting in gm/sec

 

Anonymous User Mathematical physics 29 Sep, 2019 1 Answer 86 views







a stationary obj at 4 deg cal and weighing 3.5kg falls from height of 2000 m on snow mountain at 0 degc if temp of obj just hitting snow is 0 deg and obj comes to rest immediately obj melt at (latent heat of ice=3.5*10^5 j/s)

Anonymous User Physics 20 Sep, 2019 1 Answer 111 views


A block of mass m is placed on an another rough block of mass M and both are moving horizontally with same acceleration a due to a force which is applied on the lower block, then work done by lower block on the upper block in moving a distance s will be?

Anonymous User Physics 15 Sep, 2019 1 Answer 753 views




A particle is projected with a speed u in air at angle θ with the horizontal. The particle explodes at the highest point of its path into two equal fragments, one of the fragments moving up straight with a speed u. The difference in time in which the two particle fall on the ground is (Assume it is at a height H at the time of explosion)

Anonymous User Physics 12 Sep, 2019 0 Answer 70 views

If inside a big circle exactly 24 small circles, each of radius 2, can be drawn in such a way that each small circle touches the big circle and also touches both its adjacent small circles, then radius of the big circle is?

Anonymous User Maths 09 Sep, 2019 0 Answer 160 views