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CBSE Class 9 Answered

What is universal law of gravitation?
Asked by sprashantkumar539 | 22 Sep, 2018, 09:30: PM
answered-by-expert Expert Answer
Universal law of gravitation states that every particle attracts every other particle in the universe by a force which is directly proportional to the product of mass of particles and inversely proportional to the square of distance between them.
 
 
F equals space fraction numerator m 1 space x space m 2 space over denominator r squared end fraction F minus space g r a v i t a t i o n a l space f o r c e space m subscript 1 space a n d space m subscript 2 space minus space m a s s space o f space p a r t i c l e s space r minus space d i s tan c e space b e t w e e n space t h e space t w o space p a r t i c l e s space
Answered by Shiwani Sawant | 24 Sep, 2018, 11:14: AM

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CBSE 9 - Physics
A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are): a. A downward force of gravity along with a steadily decreasing upward force b. A steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest point on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth c. Constant downward force of gravity along with an upward force that steadily decreases until the ball reaches it highest point on the way down there is only a constant downward force of gravity d. Constant downward force of gravity only
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CBSE 9 - Physics
what is the weight of an object at the centre of the earth 
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CBSE 9 - Physics
what is Newton's contribution on gravitation?
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CBSE 9 - Physics
two satellites of a planet have period 32 day and 256 days if the radius of orbit of former is R, find the orbital radius of the letter
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CBSE 9 - Physics
weight of the body is zero in free fall why?
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CBSE 9 - Physics
my doubt is the value of G is 60673multiply10-11power but why we use some no in some different numericals like use of 6.6, some times 6.7 why please ans this ques now 🙏
Asked by mannatjohn920 | 15 Feb, 2022, 09:57: AM
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CBSE 9 - Physics
Find the force of gravitational attraction between the earth (m = 6 x 1024 kg) and 80 kg man if he is standing at sea level. The distance of man from earth's center is 6.38 x 106 m.
Asked by sudiptaroy0607 | 08 Jan, 2022, 04:59: PM
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CBSE 9 - Physics
a stone is released from the top of the tower of height 19.6 m calculate its final velocity just before touching the ground
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CBSE 9 - Physics
what is gravitation
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CBSE 9 - Physics
how does the force of gravitation between two objects change when the distance between them is reduced to half
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