A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will
(a) move downwards
(b) move upwards
(c) remain at the same position
(d) move sideways
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A tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle 30° with it.
Answer Let AC be the broken part of the tree. ∴ Total height of the tree = AB+AC In right ΔABC, cos 30° = BC/AC ⇒ √3/2 = 8/AC ⇒ AC = 16/√3 Also, tan 30° = AB/BC ⇒ 1/√3 = AB/8 ⇒...
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A body is falling from a height h. After it has fallen a height h /2 , it will possess
(d) more kinetic and less potential energy
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A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground,
m g h = m ×10 ×10 = 100m J. Energy is reduced by 40% then the remaining energy is 60m J. Therefore, 60 m = m ×10 × h′ or h′...
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An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground
When the object moves upwards, the work done by gravity is negative (as the direction of gravitational force is towards the Earth’s center) and when the object come downwards, there...
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A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance
(c) A batsman hits a cricket ball, which then rolls on a level ground. After covering a short distance, the ball comes to rest because there is frictional force on...
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A ball is dropped from a height of 10m. If the energy of the ball reduces by 40percent after striking ground, how high ball bounce
Solution: H1 =10 m, v1 =? Loss of energy =40% H2 =? On striking the floor, K.E = P.E ½ mv12 = mg H1 V1 = ?(2gH1)= ?( 2x9.8x10) V1= ?196= 14 m/s As the body loses 40% of its energy, final...
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Baichung’s father is 26 years younger than Baichung’s grandfather and 29 years older than Baichung. The sum of the ages of all the three is 135 years.
Let Baichung's father's present age be x years Given Baichung's father is 29 years older than Baichung Hence Baichung's age is (x − 29) years Baichung's grandfather is 26 years older than Baichung's...
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The Big Trunk Route runs through: The Mediterranean — Indian Ocean
Answer is The Mediterranean — Indian Ocean
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America is home to a national Christmas tree! The tree is traditionally lit by who?
Answer is "President of the United States of America" The national Christmas tree is actually a large tree which an evergreen tree and located Near the famous white house and northeast...
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America is home to a national Christmas tree! The tree is traditionally lit by who ?
President of United States
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