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 sideways
B) move downwards
C) move upwards
D) remain at the same position
1 Answers
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The volume of a closed square based rectangular box is 1000 cubic metre. The cost of constructing the base is 15 paise per square metre and the cost o
Correct Answer - 10 metre, 10 metre, 10 metre
2 Answers 1 views
A particle when projected vertically upwards from the ground, takes time T to reach maximum height H. Find out (i) The height of the particle from gro
Correct Answer - (i) `3H//4,8H//9,8H//9,15H//16, 1:3,1:8,1:8,1:15` (ii) 1 : 7
2 Answers 3 views
A ball is projected from ground in such a way that after 10 seconds of projection it lands on ground 500 m away from the point of projection. Find out
Correct Answer - (i)`theta=45^(@)` (ii)`50sqrt(2)m//s` (iii)`50m//sec`
2 Answers 10 views
20. A coconut of mass \( 2 Kg \) is falling from a coconut free of height \( 10 m \). Find the potential energy, kinetic energy and total energy at the following points. \( \left( g =10 m / s ^{2}\right) \) a) Before falling from the coconut tree. b) Just before hilting the ground. c) At a height \( 4 m \) from the ground. d) Which law is evident from this example?
(a) Given m = 2 kg h = 10 m Potential energy at before falling from the coconut tree. u = mgh u = 2 x 10 x 10 u = 200 joule Kinetic energy will...
2 Answers 1 views
An aeroplane id flying at a height of 300 m above the ground. Fying at this height , theangles of depression from the aeroplane of two points on both
Correct Answer - `14.64 m`
2 Answers 1 views
Five years ago, the sum of the ages of a father and two sons was \( x \) years, then after five years, the sum of the ages of all will be years.
5 years after age of each of father and his two sons will be 10 years more than it was 5years ago. Hence after 5years the sum of thieir age...
2 Answers 1 views
A body released from height ‘h’ takes time’t’ to reach the ground. After time t/2, its height from the ground is
C) \(\cfrac{3h}4\)
2 Answers 1 views
When iron nail dipped in CuSO4 the nail becomes brown due to
A) deposition of copper on iron
2 Answers 1 views
After 12 years the age of Ramu is 3 times the age before he was 4 years then his present age is ………………. years.
Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...
2 Answers 1 views
The product of Shikha’s age five years ago and her age 8 years later is 30, her age at both times being given in years. Find her present age.
Let the present age of Shikha be ‘a’ years. Given, product of Shikha’s age five years ago and her age 8 years later is 30 ⇒ (a – 5)(a + 8) =...
2 Answers 1 views