When an object is thrown up, the force of gravity

If the distance force of masses is doubled, the force between them will be

Consider an elevator moving downwards with an acceleration a, the force exert by a passenger of mass m on the floor of the elevator is

When an object falls freely to the earth, the force of the gravity is

The weight of a body of mass 1 kg on earth is

List three phenomena which can be explained by applying universal law of gravitation.

The pressure exerted by the weight of a cubical block of side 4 cm on the surface is 10 pascal. Calculate the weight of the block.

Suppose your weight on the surface of the earth is 600 N and are taken to a height equal to the radius of the earth, then what will be your weight there?

Name two forces which act on a body immersed in a liquid. Give the directions in which they act.

Density of iron is 7900 kg m^-3. Calculate its relative density. Will it float or sink in water? Give reason for your answer. (Take,density of water = 1000 kgm^-3 )

Differentiate between 'g' and 'G' in a tabular form.

Calculate the acceleration due to gravity on the surface of satellite having mass 7.4 x 10²² kg and radius 1.74 x 10⁶ cm. (Take,G = 6.7 X 10^-11 N-m/kg²)

A particle weighs 120 N on the surface of the earth. At what height above the earth's surface will its weight be 30 N? Radius of the earth = 6400 km.

Mohit throws a ball horizontally while Shobhit throws a ball vertically downwards from a tower. Both of them do so in an attempt to see who hits the stone on ground first. After that, they try to reason their findings.
Read the above passage and answer the following questions:
(i) Which ball reaches the ground first?
(ii) What are the values shown by Mohit and Shobhit?
(iii) What is the relation of g with G?

Shruti and Kriti were performing the experiment to find the pressure exerted by a cuboid kept on sand with its different faces. Shruti shared her thoughts with Kriti and told her that, since the teacher had explained about pressure and area, therefore she could guess the results.
(i) How can you relate pressure applied by an object with its area?
(ii) What would be the observation of Shruti and Kriti?
(iii) Which qualities about Shruti do you observe from here?

A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
(i) the maximum height to which it rises,
(ii) the total time it takes to return to the surface of the earth.

(i) At some moment, two giant planets jupiter and saturn of the solar system are in the same line as seen from the earth. Find the total gravitational force due to them on a person of mass 50 kg on the earth. Could the force due to the planets be important?
Mass of the jupiter = 2 x 10²⁷ kg
Mass of the saturn = 6 x 10²⁶ kg
Distance of jupiter from the earth
= 6.3x 10¹¹ m
Distance of saturn from the earth
= 1.28 x 1012m
Gravitational constant,
G = 6.67 x 10^-11N -m² /kg²
Acceleration due to gravity on the earth
=9.8 m/s²
(ii) A bag of sugar weighs w at a certain place on the equator. If this bag is taken to Antarctica, then will it weigh the same or more or less. Give a reason for your answer.

(i) Define relative density. Give its mathematical form.
(ii) The mass of an iron cube having an edge length 1.5 em is 50 g. Find its density.
(iii) The volume of a 250 g sealed tin is 400 cubic cm. Find the density of the tin in g (cc)-1. State, if the object would sink or float in water