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Two small bodies of masses 10 kg and 20 kg are kept at a distance 1 m apart and released, Assuming that only mutual gravitation force is acting , find the speedsd of the particles when the separation decreases to .5 m

Four particles of equal masses M move along a circle of of radius R under the action of their mutual gravitational attraction. Find the speed of each particle

Four particles having masses m , 2m , 3m and 4m are placed at the four corners of a square of edge a . Find the gravitational force acting on a particle of mass m placed at the centre .

Only this chapter is necessay for IIT-JEE.

WHICH ONE IS GOOD ARIHANT'S OBJECTIVE MATHEMATICS FOR IIT OR A DAS GUPTA

For theoritical part use morrison and Boyd and for questions use Arihant(organic chemistry)

On the basis of the acid-catalyzed hydration, can you suggest a reason why the reaction

CH₂=CHCH(CH₃)₂ _H2SO4 CH₃CHCH(CH₃)₂

_H2O

w

ould probably not be a good method for the synthesis of 3-methul-2-butanol ?

A spring of negligible mass having a force constant k extends by an amount y when a mass m is hung from it. The mass is pulled down a little and released. The system begins to execute SHM of amplitude A and angular frequency . The total energy of the mass-spring system will be

A) 1/2 mA² ²

B) 1/2 mA²

² + 1/2 ky²

C) 1/2 ky²

D) 1/2 mA²

² - 1/2 ky²

Ans ? (B)

Plz explain

The work done by the external forces on a system equals the change in

a) total energy

b) kinetic energy

c) potential energy

d) none of these

Plz explain the ans

ans is (a)

A heavy stone is thrown from a cliff of height h with a speed v. The stone will hit the ground with max speed if it it thrown

a) vertically upward

b) vertically downward

c) horizontally

d) the speed does not depend on the initial direction

plz explai

ans is (d)

The equation of the tangent at the point P(t), where t is any parameter, to the parabola y² = 4ax is

Brilliant tutorials because many students take part in it

A concave mirror forms the real image of a point source lying on the optical axis at a distance of 50 cm from the mirror. The focal length of the mirror is 25 cm. The mirror is cut in two and its halves are drawn a dist of 1 cm apart in a direction perpendicular to the optical axis . How will the image formed by the halves of the mirror be arranged

Convex and concave mirrors have the same radii of curvature R. The distance between the mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of light A be placed for the rays to converge at the point A after being reflected first on the convex and then on the concave mirror?