Q. 134.6( 8 Votes )
(a) A book has a mass 400 g. Find its weight when taken from the surface to a height equal to the radius of the earth.
(b) Define weight.
mass of book(m)=400 g=0.4 kg
Let the radius of the earth be R.
height of book=R
the distance of book from the centre of the earth(d)=radius of earth + height of book=R+R=2R
The acceleration due to gravity at the surface of the earth(g) is given by,
The acceleration due to gravity at such height(g’) is given by,
(b) Weight is the force with which a body is attracted towards the center of the earth. It is directly proportional to the acceleration due to gravity. It is given by, Weight=mass × acceleration due to gravity
Rate this question :
Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don’t we notice such forces? Why don’t the two objects in a room move towards each other due to this force? (Picture)Lakhmir Singh & Manjit Kaur - Physics
Two particles are places at some distance from each other. If, keeping the distance between them unchanged, the mass of each of the two particles is doubled, the value of gravitational force between them will become:
A. 1/4 times B. 1/2 times
C. 4 times D. 2 timesLakhmir Singh & Manjit Kaur - Physics
The value of acceleration due to gravity of earth:
A. Is the same on equator and poles?
B. Is the least on poles?
C. Is the least on equator?
D. Increases from pole to equatorLakhmir Singh & Manjit Kaur - Physics
The value of gravitational constant depends upon:Evergreen - Science
Which force is responsible for holding the solar system together?Lakhmir Singh & Manjit Kaur - Physics