Answer:
Absolute zero is where the particles/molecules are not moving at all, meaning that there is no heat.
This means that the answer is:
1. All particles are moving and this movement allows us to measure the thermal energy of an object or substance. If the particles were able to completely stop moving this would be called reaching absolute zero.
Answer:
Explanation:
When unpolarized light passes through a polarizer, only the component of the light vibrating in the direction parallel to the axis of the polarizer passes through: therefore, the intensity of light is reduced by half, since only 1 out of 2 components passes through.
So, after the first polarizer, the intensity of light passing through is:
Where is the initial intensity of the unpolarized light.
Then, the light (which is now polarized) passes through the second polarizer. Here, the intensity of the light passing through the second polarizer is given by Malus Law:
where:
is the angle between the axes of the two polarizers
In this problem the angle is
So the intensity after of light the 2nd polarizer is:
1.
Answer:
Hand on book
Earth on book
Explanation:
Since we are holding the book so the forces that acts on the book is
1. Hand on book
this is the contact force between hand and the book
2. Earth on book
here this is the gravitational attraction force of earth on the book
2.
Answer:
A. book on hand - NA
B. hand on book - upwards
C. floor on book - NA
D. earth on book - downwards
Explanation:
Since book is holding in hand so at equilibrium position we can say that the forces on the book must be in equilibrium
so first of all the force of attraction due to earth on the book is downwards and this is counterbalanced by the force of hand on book which is upwards.
3.
Answer:
A. book on hand
Explanation:
As per Newton's III law we know that every action has equal and opposite reaction.
so if our hand apply the force on the book in upward direction then book will apply same magnitude force on the hand in downward direction.