Basic Science T...

On a $$60cm*60cm$$ carrom board, a carrom-coin placed at the centre is hit by the striker. The coin moves to the front edge, rebounds and strikes to the mid-point of the right side limb and stops. The displacement of the coin is

A particle goes from $$(0, 0)$$ to $$(0,8)$$ and from $$(0,8)$$ to $$(6, 8)$$. Distance travelled and displacement respectively are

If the period of oscillation of a simple pendulum is increased by $$a\%$$ then the percentage in its length is

A very large number of balls are thrown vertically upwards in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5 m then the number of ball thrown per minute is (g = 10 m s$$^{-2}$$)

In the system shown below calculate the reading of the weighing machine, if the man pulls the string with a force of $$400$$ N. (Given the mass of man is $$30$$ kg and the mass of elevator is $$10$$ kg, weighing machine is light and string and pulley are ideal).

A d-shell containing four unpaired electrons can exchange

Two bodies of masses $$5kg$$ and $$3kg$$ are moving towards each other with $$2ms^{-1}$$ and $$4ms^{-1}$$
respectively then velocity of centre of mass is

A car moving at a consatnt speed of $$36\ kmph$$ moves north wards for $$20$$ minutes then due to west with the same speed fro $$8\dfrac{1}{3}$$ minutes. What is the average velocity of the car during this run in kmph

A car travelling at a speed of 30 kilometer per hour is brought to a halt in 8 metres by applying brakes. If the same car is travelling at 60 km per hour, it can be brought to a half with same braking power in 

A stone is dropped from the top of a tower of height h. After 1 s another stone is dropped from the balcony $$20\,m$$ below the top. Both reach the bottom simultaneously. What is the value of h ? Take $$g = 10\,ms^{-2}.$$