Answer:
Explanation:
position of centre of mass of door from surface of water
= 10 + 1.1 / 2
= 10.55 m
Pressure on centre of mass
atmospheric pressure + pressure due to water column
10 ⁵ + hdg
= 10⁵ + 10.55 x 1000 x 9.8
= 2.0339 x 10⁵ Pa
the net force acting on the door (normal to its surface)
= pressure at the centre x area of the door
= .9 x 1.1 x 2.0339 x 10⁵
= 2.01356 x 10⁵ N
pressure centre will be at 10.55 m below the surface.
When the car is filled with air or it is filled with water , in both the cases pressure centre will lie at the centre of the car .
Answer:
1.2 × 10^27 neutrons
Explanation:
If one neutron = 1.67 × 10^-27 kg
then in 2kg...the number of neutrons
; 2 ÷ 1.67 × 10^-27
There are.... 1.2 × 10^27 neutrons
Answer:
5.9 km/hour
Explanation:
divide 12.5 by 2.1 and the answer is 5.9
Answer:
In Newton's Cradle there are N number of balls are suspended from the thread such that they all touch each other.
Now when we pull one ball apart and released then after the collision one ball on the other side moves up
Then in next time if we pull two balls from one side then after collision it will pull upwards exactly two balls on the other side after collision.
So here the number of balls on the other side is exactly same every time we pull the balls.
This is due to the conservation of momentum principle
As we know that all the balls are identical here then when we pull any number of balls on one side and then release them then after collision the momentum of the balls is transferred to same amount of the balls on the other side
Since there is no external force on this system so we can say that that this momentum conservation will exist for all cases and all number.
