Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent
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0
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5807
|
March 21, 2018
|
Give reasons for the following: The reverberation time of a hall used for speeches should be very short
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0
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2868
|
March 21, 2018
|
Calculate the average density of the earth in terms of g, G and R
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0
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4714
|
March 21, 2018
|
On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
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0
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7795
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March 21, 2018
|
State an approximate value for the speed of sound in air
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0
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1758
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March 21, 2018
|
Give three differences between acceleration due to gravity (g) and universal gravitational constant (G)
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0
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14687
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March 21, 2018
|
Prove that if the earth attracts two bodies placed at same distance from the centre of the earth with the same force, then their masses are equal
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0
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25356
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March 21, 2018
|
Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. Then what will happen to your weight?
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0
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17355
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March 21, 2018
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A girl is sitting in the middle of a park of dimension 12 m X 12 m
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0
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5006
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March 21, 2018
|
What is the source of centripetal force that a planet requires to revolve around the sun? On what factors does that force depend?
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0
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828
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March 21, 2018
|
Why does a body reach the ground quicker at poles than at the equator when dropped from the same height?Why does a body reach the ground quicker at poles than at the equator when dropped from the same height?
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0
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10035
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March 21, 2018
|
When does an object show weightlessness?
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0
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5160
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March 21, 2018
|
In the graphs given below representing the human voice, which of the two graphs or is likely to be the male voice? Give reason for your answer
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0
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3128
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March 21, 2018
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Mention any four phenomena that the universal law of gravitation was able to explain
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0
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12398
|
March 21, 2018
|
What is a sound board?
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0
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4095
|
March 21, 2018
|
The earth attracts an apple. Does the apple also attract the earth? If it does, why does the earth not move towards the apple?
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0
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2705
|
March 21, 2018
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Write full form of acronym SONAR. Explain how the method of echo- ranging is used to determine the depth of sea
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0
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3014
|
March 21, 2018
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Draw diagrams to represent soft sound and loud sound
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0
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2557
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March 21, 2018
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Describe Newton’s third law of motion
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0
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1320
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March 21, 2018
|
. Plot the following: A longitudinal wave in air on a density-distance graph. A transverse wave on a displacement-distance graph
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0
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4395
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March 21, 2018
|
What is the relationship between mass and inertia? Explain with the help of examples
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0
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22940
|
March 21, 2018
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Derive the mathematical formula of conservation of momentum
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0
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12006
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March 21, 2018
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Which wave characteristics determine the loudness pitch of sound?
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0
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2046
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March 21, 2018
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Derive the mathematical relation of Newton’s second law of motion
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0
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31165
|
March 21, 2018
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Describe Newton’s first law of motion in detail, giving examples
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0
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846
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March 21, 2018
|
Why do the driver and the person seated in front seat need a seat belt?
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0
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6084
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March 21, 2018
|
Describe balanced forces with the help of two examples
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0
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3939
|
March 21, 2018
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Prove that u=vλ, where the symbols have their usual meanings
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0
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6512
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March 21, 2018
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Why does an athlete puts some sands or cushion on the ground while high jumping?
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0
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9186
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March 21, 2018
|
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it
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0
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10748
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March 21, 2018
|