Answer:
Absolute Pressure at depth h =
Explanation:
<u>Given:</u>
- Radius of the bubble at depth h,
- Radius of the bubble at the surface of the water,
- Acceleration due to gravity,
<u>Assumptions:</u>
- Atmospheric pressure,
- Density of water,
- Pressure at depth h =
- Pressure at the surface of water =
According to Ideal Gas Law,
where,
- P = pressure.
- V = volume.
- n = number of molecules.
- k = Boltzmann constant.
- T = absolute temperature.
For the given case, the temperature of the air bubble is constant. The number of molecules of the bubble also does not change, therefore,
PV = constant.
The pressure at the surface is equal to the atmospheric pressure,
The pressure at depth h is equal to sum of atmospheric pressure and the pressure of the water upto depth h,
Using these values,
The absolute temperature at that depth is given by
Answer:
A
Explanation:
Friction is a force that makes an object slow down. Not speed up, cause it to move, or occurs in a vacuum. Friction is often caused by the surface an object is moving on.
We can solve the problem by requiring the equilibrium of the forces and the equilibrium of torques.
1) Equilibrium of forces:
where
is the weight of the person
is the weight of the scaffold
Re-arranging, we can write the equation as
(1)
2) Equilibrium of torques:
where 3 m and 2 m are the distances of the forces from the center of mass of the scaffold.
Using
and replacing T1 with (1), we find
from which we find
And then, substituting T2 into (1), we find
Answer:
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