Recent questions tagged medium

The rate of solvolysis of the following allyl chloride in 50% aqueous ethanol at $44^{\circ}C$ is

asked Aug 23, 2013 by sreemathi.v

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Refer to the below image : Assuming both the reactions are E1 the expected ratio between $K_H/K_D$ is

asked Aug 23, 2013 by sreemathi.v

1 answer

Which of the following can give both $E$ and $Z$ products?

asked Aug 23, 2013 by sreemathi.v

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The mean radius of earth is R, its angular velocity on its own axis is 'w' and acceleration due to gravity is g. What will be the radius of orbit of a geostationary satellite ?

asked Aug 22, 2013 by meena.p

1 answer

A satellite revolving in a circular equatorial orbit of radius $r= 2 \times 10 ^4 km$ from west to East appears over a certain point at the equator every $11.6$ hours. Calculate the actual angular velocity of the satellite

asked Aug 22, 2013 by meena.p

1 answer

A geo stationary satellite orbits around the earth in a circular orbit of radius $36000km$. Then the time period of a spy satellite orbiting a few Kilometers above the earth's surface $(R_{earth}=6400 Km)$ will be approximately

asked Aug 22, 2013 by meena.p

1 answer

A satellite is seen after each 8 hours over equator at a place on earth when its sence of rotation is opposite to the earth. The time interval after which it can be seen at the same place when sense of rotation of earth and satellite is same , will be

asked Aug 22, 2013 by meena.p

1 answer

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

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

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

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

1 answer

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

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

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

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

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

What is the radius of moon's orbit around earth assuming the orbit to be circular ($g=9.8 m/s^2$; Radius of earth =6400 km; period of rotation of moon around the earth $=27.3\; days$

asked Aug 20, 2013 by meena.p

1 answer

Five digit numbers are formed using the digits 0,1,2,3,4. Out of these numbers in how many numbers at least one number is repeated?

asked Aug 15, 2013 by rvidyagovindarajan_1

1 answer

The sum of the digits in unit place of all the numbers formed using 3,4,5,6 taking all at a time is?

asked Aug 15, 2013 by rvidyagovindarajan_1

1 answer

The number of ways in which a cricket team of eleven players can be selected from 22 players which includes a particular two and excludes a particular 4 players is

asked Aug 14, 2013 by rvidyagovindarajan_1

1 answer