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CBSE Class 9 Answered

Why hydrogen filled balloons rises only to some particular height and does not flows out of the atmostphere?
Asked by | 21 Aug, 2012, 10:03: PM
answered-by-expert Expert Answer
It moves upto the height where the bouyant force by the atmosphere and the weight of the balloon is same ie cancels each other.
Answered by | 22 Aug, 2012, 09:55: AM

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CBSE 9 - Physics
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
Asked by mailtoparvathyprajith | 08 Feb, 2024, 12:13: PM
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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
why pressure increases with depth in fluid
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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
bhai a liquid used to operate the break in a car
Asked by sumantk60559 | 10 Jun, 2022, 07:18: PM
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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
Asked by rk7213908 | 31 Mar, 2022, 12:28: PM
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CBSE 9 - Physics
weight of the body is zero in free fall why?
Asked by rk7213908 | 21 Feb, 2022, 04:48: PM
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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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