Recent questions tagged jeemain

A satellite can be in a geostationary orbit around the earth at a distance r from the center. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its distance from the center is

asked Aug 22, 2013 by meena.p

1 answer

In which of the following pair one species is incorrectly indicated which would give higher Substitution /Elimination ratio when it reacts with isopropyl bromide.

asked Aug 22, 2013 by sreemathi.v

1 answer

The height to which the acceleration due to gravity becomes $\large\frac{g}{9}$ (where g= acceleration due to gravity at surface of earth ) in terms of $R$, is

asked Aug 21, 2013 by meena.p

1 answer

Three identical stars each of mass M form an equilateral triangle that rotates around the center of the triangle. The system is isolated and edge length of the triangle of the triangle is L. The amount of work that is required to dismantle the system is

asked Aug 21, 2013 by meena.p

1 answer

An object of mass m starts falling towards planet of mass M and Radius R. As it reaches near the surface it passes through a small hole in the planet. The planet is made of two pieces, a sperical shell of negligible thickness and mass $\large\frac{2M}{3}$ and a point mass of $\large\frac{M}{3}$ at center. Change in the force of gravity experienced by the object is

asked Aug 21, 2013 by meena.p

1 answer

Refer to the below equation :

asked Aug 21, 2013 by sreemathi.v

1 answer

A geostationary satellite is at a height h above the surface of the earth If R is radius of earth 1) The mimimum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+a}\bigg)$ 2) The maximum coaltitude on earth upto which the satellite can be used for communication is $\sin ^{-1} \bigg(\large\frac{R}{R+h}\bigg)$ 3) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\sin \theta)$ 4) Area of earth escaped from this satellite is given by $ (2 \pi R^2(1+\cos \theta)$

asked Aug 21, 2013 by meena.p

1 answer

Four similar particles of mass M are orbiting in a circle of radius r in the same angular direction because of their mutual gravitational attraction, velocity of particle is

asked Aug 21, 2013 by meena.p

1 answer

In which of the following case increase in solvent polarity causes a large in rate of the reaction.

asked Aug 21, 2013 by sreemathi.v

1 answer

Refer to the below equations :

asked Aug 21, 2013 by sreemathi.v

1 answer

$R-L$------------>$R-X$. L is a good leaving group .The rate of the reaction is maximum when $Li-X$ is

asked Aug 21, 2013 by sreemathi.v

1 answer

Infinite numbers of masses, each of mass m,are placed along straight line at distances of r,2r,4r,8r etc from a reference point O.Find the gravitational field at point O

asked Aug 21, 2013 by meena.p

1 answer

The reaction $R-Cl+R'ONa$---------->$ROR'+NaCl$.The reaction is catalysed by the addition of small amounts of $NaI$ because

asked Aug 21, 2013 by sreemathi.v

1 answer

Three uniform spheres of mass M and radius R each are kept in such a way that each touches the other two. The magnitude of the gravitational force on any of the sphere due to the other two sphere is

asked Aug 21, 2013 by meena.p

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The correct decreasing order of vapour phase dipole moments of $CH_3-x$ is as follows

asked Aug 21, 2013 by sreemathi.v

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A satellite of mass m moves along an elliptical path around the earth. The areal velocity of satellite is proportional to

asked Aug 21, 2013 by meena.p

1 answer

A light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and star is proportional to $R^{\large\frac{-5}{2}}$ then $T^2$ is proportional to

asked Aug 21, 2013 by meena.p

1 answer

A ring has a total mass M but not uniformly distributed over its circumference . The radius of ring is R. A Point mass m is placed at the center of the ring. Work done in taking away this point mass from center to infinity is

asked Aug 21, 2013 by meena.p

1 answer

A spaceship is lanunched into a circular orbit close to the earth's surface. What additional velocity has now to be imparted to the space ship in the orbit to overcome the gravitational pull. (Radius of earth$= 6400 km,g=9.8 m/s^2$)

asked Aug 20, 2013 by meena.p

1 answer

Three masses 1 kg 2 kg and 3 kg are placed at the vertices of an equilateral triangle of side 1m. Find the gravitational potential energy of the system $(G=6.67 \times 10^{-11} Nm^2 /kg^2)$

asked Aug 20, 2013 by meena.p

1 answer

A particle is projected from the surface of earth with an initial speed of 4 km/s . Find the maximum height attained by the particle.Radius of earth =6400 km and $g= 9.8 m/s^2$

asked Aug 20, 2013 by meena.p

1 answer

In a double star, two stars of masses $m_1$ and $m_2$ distant r apart revolve about their common center of mass under their mutual gravitational attraction. Find the ratio of their kinetic energies $K_1 :K_2$

asked Aug 20, 2013 by meena.p

0 answers

A Spherical hole of radius $\large\frac{R}{2}$ is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the center of the hole due to the remaining mass is

asked Aug 20, 2013 by meena.p

1 answer

In how many ways can 10 different marbles be distributed between 2 boys so that one of them get 7?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

In how many ways can 3 girls and 9 boys can be seated in two vans having 3 numbered seats in the front and 4 numbered seats at the back so that the 3 girls are to be seated together in the back row?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

How many numbers are there between 20000 and 30000 in which the digits are 2,3,5,6,7 and each digit can be repeated any number of times.

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

Find the number of rectangles in the figure.

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

By what percent the energy of satallite has to be increased to shift it from an orbit of radius r to $\large\frac{3}{2}$$r$

asked Aug 20, 2013 by meena.p

1 answer

The largest natural numer $n$ for which $(33)!$ is divisible by $2^n$ is ?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

In how many ways can 7 plus (+) signs and 4 minus (-) signs can be arranged in a row so that no two minus signs are together?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

How many chords can be drawn for a circle with 21 points on the circle?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

A tea paty is arranged for 16 people along two sides of a long table with 8 chairs on either sides. Four men wish to sit on one side and 2 on other side. In how many ways they can be seated?

asked Aug 20, 2013 by rvidyagovindarajan_1

1 answer

The ratio of kinetic energy required to raise a satellite upto a height 'h' to the kinetic energy of the satellite at that height (R-radius of earth)

asked Aug 20, 2013 by meena.p

1 answer

A satellite revolving roung the earth with orbital speed $v_0$, If it stops suddenly, the speed with which it will strike the surface of the earth would be (-ve escape velocity of the particle on earth's surface)

asked Aug 20, 2013 by meena.p

1 answer

Two bodies of masses $m_1$ and $m_2$ are initially at rest placed infinite distance apart. They are then allowed to move towards each other under their mutual gravitational attraction. Their relative velocity when they are 'r' distance apart is

asked Aug 20, 2013 by meena.p

1 answer

A planet revolves around the sum in an elliptical orbit of eccentricity e.If T is the time period of the planet, then the time spent by the planet between the ends of the planet between the ends of the minor axis close to the sun is

asked Aug 20, 2013 by meena.p

1 answer