A planet is moving in an elliptic orbit. If T,V,E and L stand, respectively, for its kinetic energy, gravitational potential energy, total energy and angular momentum about the centre of force, then
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The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g cm−3.Find the density of the substance and interpret whether the substance will sink or float?
Construction of submarines is based on
Five particles each of mass 'm' are kept at five verties of a regular pentagon . A sixth particles of mass 'M' is kept at center of the pentagon 'O'.Distance between'M' and is 'm' is 'a'. Find (a) net force on 'M' (b) magnitude of net force on 'M' if any one particle is removed from one of the verties.
The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?
Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by
States the Archimedes' principle. List its two applications.
Is the buoyant force on a submerged object equal to the weight of the object itself or equal to the weight of the fluid displaced by the object?
Two point masses of mass 4m and m respectively separated by d distance are revolving under mutual force of attraction. Ration of their kinetic energies will be: