PART A)
Heat released by iron = heat gain by water
now we have
PART B)
When endothermic changes takes place in the system then system absorbs the energy from its surrounding and keeps on cooling down
Due to this the observer will feel the cool down of the surface temperature and conclude that it is an endothermic reaction
PART C)
When a substance freezes its temperature do not change but if we will check the potential energy of molecules we can conclude that the system released its energy which is known as latent heat.
This will lead to the increase in its potential energy
And due to this decrease in latent heat the substance will freeze
time taken by the object dropped = 2s
this time depends on the height of the plane from ground
it is given by
now the distance covered horizontally is given as 190 m
now the speed of the object is
now when plane is moving at same height but with double speed
so it will take same time to hit the ground again
so the time is given as
so it will take t = 2 s again to hit the ground
Force = (mass) x (acceleration)
= (2 kg) x (20 m/s²) = 40 newtons .
about 9 pounds .
Note: The ball can only accelerate during the short time
that the clubface is in contact with it. Once it leaves the
clubface, it can't accelerate any more.
Also ... that's one heckuva golf ball. It weighs about 4.4 pounds !
Answer:
Explanation:
Given:
- refractive index of the glass plate,
- thickness of the glass plate,
- wavelength of the source light,
<u>We know that the refractive index of a medium is given as:</u>
Hence the no. of wavelengths in the glass:
Magnetic forces can cause charged particles to move in circular or spiral paths. Particle accelerators keep protons following circular paths with magnetic force. The magnetic force is perpendicular to the velocity, and so velocity changes in direction but not magnitude. Uniform circular motion results.