Answer:
The height of the liquid column doesn't affect the pressure on top pressure ina liquid is affected by the weight of the above it
Internal energy is B. The sum of the kinetic and potential energies of the particles in a system
Explanation:
The internal energy possessed by the particles in any substance has two origins:
- Part of the energy of the particles is due to the motion of the particles. In fact, for a substance at a temperature larger than absolute zero, the particles in the substance are always in motion (for a solid, they just vibrate around their fixed position, while in a liquid and in a gas, the particles are actually free to move). Because of this motion, the particles have kinetic energy. The temperature of a substance is a measure of the average kinetic energy of the particles in the substance.
- The rest of the energy of a substance is in the form of potential energy, and it refers to the energy contained in the bonds between the particles of the substance (for instance, in the intermolecular bonds between different atoms in a solid). For a gaseous substance, these intermolecular bonds are very weak, therefore the potential energy is not considered and the internal energy of a gas depends only on its kinetic energy (and therefore, only on the temperature of the substance).
Therefore, the internal energy of a substance is the sum of the kinetic and the potential energies of the particles in the substance.
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Answer:
45.9m
Explanation:
Given parameters:
Final velocity = 30m/s
Initial velocity = 0m/s
Unknown:
Height of fall = ?
Solution:
The motion equation to solve this problem is given below;
V² = U² + 2gH
V² = 0 + (2 x 9.8 x H)
30² = 19.6H
H = 
= 45.9m
Answer:
Pressure amplitude, 
Explanation:
It is given that,
The maximum displacement equal to the diameter of an oxygen molecule, 
Speed of sound at 0 degrees is, v = 331.5 m/s
The pressure amplitude for the longitudinal wave is given by :
Where
is the density of air, 
f is the frequency say 59 Hz
So, pressure amplitude is given by :
So, the pressure amplitude in a sound wave in the air must be . Hence, this is the required solution.
