Advertisements
Advertisements
प्रश्न
Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.
Advertisements
उत्तर
Let ME be the mass of the Earth and m be the mass of an object on its surface. If R is the radius of the Earth, then according to the universal law of gravitation, the gravitational force (F) acting between the Earth and the object is given by the relation:
F = `(Gm_1m_2)/r^2`
M = mass of the earth.
m = mass of the object.
r = distance between the earth and the object.
G = proportionality constant.
APPEARS IN
संबंधित प्रश्न
Choose the correct alternative:
Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).
Choose the correct alternative:
Acceleration due to gravity is independent of mass of the earth/mass of the body.
State two applications of universal law of gravitation.
Consider a planet moving in an elliptical orbit round the sun. The work done on the planet by the gravitational force of the sun
(a) is zero in any small part of the orbit
(b) is zero in some parts of the orbit
(c) is zero in one complete revolution
(d) is zero in no part of the motion.
Three equal masses m are placed at the three corners of an equilateral triangle of side a. Find the force exerted by this system on another particle of mass m placed at (a) the mid-point of a side, (b) at the centre of the triangle.
The force of attraction between any two material objects is called __________.
Explain the difference between g and G.
The gravitational force between two bodies is directly proportional to the product of the masses of those bodies and is _______ of the distance between them.
Mahendra and Virat are sitting at a distance of 1 m from each other.Their masses are 75 kg and 80 kg respectively. What is the gravitational force between them? (G = 6.67 × 10-11 Nm2/kg2)
Molecules in air in the atmosphere are attracted by gravitational force of the earth. Explain why all of them do not fall into the earth just like an apple falling from a tree.
