Subject: Science, asked on 16/1/18

## name the force which is responsible for change in position or state of an object.

Subject: Science, asked on 16/1/18

## define relative density. give its mathematical formula define density give its SI units  a solid weighs 80 gm in air 64 gm in water calculate the relative density of the solid .  when kept in water, state if the object would float or sink ​

Subject: Science, asked on 16/1/18

## define momentum. derive its SI unit. How is force expressed in terms of momentum? b) two balls A and B OF MASSES 'm' and '2m' are in motion with velocities 2v and 1v respectively  compare:  i) their inertia  ​ii) their momentum

Subject: Science, asked on 16/1/18

## what is the importance of the universal law of gravitation? explain it through any three phenomenons

Subject: Science, asked on 16/1/18

## a block of wood of mass 6 kg and dimensions 50 cm*30 cm*20 cm is placed on a table top. Find the pressure exerted if the block lies on the tabletop with the sides of dimensions a) 50 cm*30 cm b) 30 cm* 20 cm

Subject: Science, asked on 16/1/18

## a) state a condition under which a body moves in such a way that a magnitude of its average velocity is equal to its average speed b) a train starting from the rest moves with a uniform acceleration of 0.2 m/s2​  for five minutes.

Subject: Science, asked on 16/1/18

## A bridge is 500 m long. a 100 m long train crosses the bridge at a speed of 30 m/s. find the time taken by train to cross it.

Subject: Science, asked on 14/1/18

## a ball is dropped from the edge of a roof. it takes 0.1s to cross a window of height 2.0m. what will be the height of the roof above the top of the window?

Subject: Science, asked on 12/1/18

## What are sin and cos ??

Subject: Science, asked on 12/1/18

## It is easier to push an empty box than a box full of books.

Subject: Science, asked on 10/1/18

## What would be acceleration of a body if its velocity-time graph is parallel to the time axis?

Subject: Science, asked on 8/1/18

## A batsman hits a ball with a force of 50N. Before the ball was hit, it waa travelling at a speed of 20m/s. After it was hit, it started travelling at a speed of 16m/s in the opposite direction. The mass of the ball is 0.3kg. For how much time was the ball in contact with the bat??

Subject: Science, asked on 4/1/18

## Define 1 pascal​? why it is difficult to walk on sand with heels?​

Subject: Science, asked on 3/1/18

## Please answer this question - Q. It is difficult to balance our body when we accidently step on a peel of Banana. Explain Why ?

Subject: Science, asked on 3/1/18

## please answer fast!!! Two similar buses are moving with same velocity on the road. One of them is empty and the other is loaded with passengers. Which of the two will be stopped by the application of less force. Explain.

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