द्रव्यमान vs भार [Mass vs Weight] in Detail!!! | Class 9 Science Gravitation | Doubtnut | 6 PM

A shell of mass M and radius R has point mass m placed at a distance r from its centre. The gravitational potential energy U(r) vs r will be

Calculate the mass and density of the earth. Given that Gravitational constant G = 6.67 xx 10^(-11) Nm^(2)// kg^(2) , the radius of the earth = 6.37 xx 10^(6) m and g = 9.8 m//s^(2) .

The value of g on the Moon is 1//6 th of that of Earth. If a body is taken from the Earth to the Moon, then what will be the change in its (i) weight, (ii) intertial mass and (iii) gravitational mass?

The gravitational field in a certain region is given as vec(E) = (3N kg^(-1)) hat(i) + (5N kg^(-1)) hat(j) (a) What will be magnitude of gravitational force acting on a particle of mass 3 g which is placed at the origin ? (b) What will be gravitational potential at point (12m, 0) and (0, 6m) considering that potential at origin is zero ? (c ) A particle of mass 3 kg is moved from the origin to the point (9m, 4m). Calculate the change of gravitational potential energy. (d) If the above particle is moved from (5m, 0) to (0, 5m), then find the change in potential energy.

If a weight lifter raises a barbell with a mass of 125.7 grams doing 5,023 joules of work, what distance did he move the barbells ? Remember that you need a force, not a mass. You must firs calculate the force in order to complete your solution. HINT : Weight is a force. Weight on earth is determined by multiplying an object's mass times earth's gravitational pull (9.8 m//s^(2) ).

The mean diameters of Mars and Earth are 6.9 xx 10^3 km and 1.3 xx 10^4 km, respectively. The mass of Mars is 0.11 times Earth's mass. (a) What is the ratio of the mean density (mass per unit volume) of Mars to that of Earth? (b) What is the value of the gravitational acceleration on Mars? (c) What is the escape speed on Mars?

A large non rotating star of mass M and radius R begins to collapse under its own gravity and ultimately becomes very small (nearly a point mass). Assume that the density remains uniform inside the sphere in any stage. Plot the variation of gravitational field intensity (well, you can call it cceleration due to gravity) at a distance (R)/(2) from the centre vs the radius (r) of the star.

The mass of electron is 9.11xx10^(-31) kg. Calculate the uncertainty in its velocity if the uncertainty in position is the uncertainty in position is of the order of +-10 pm. (h=6.6xx10^(-34)"kg"m^(2)s^(-1)) .