A) The average translational kinetic energy of the molecules in a gas is given by:
where
is the Boltzmann's constant
T is the absolute temperature of the gas
In our problem,
, so the average translational kinetic energy of the molecules is
We have 1.2 mol of this gas, and since one mole of ideal gas contains a number of molecules equal to Avogadro number, the total number of molecules in our gas is
So the total translational kinetic energy of all molecules of the gas is
B) The kinetic energy of a person is given by:
where m is the person's mass and v his velocity. The person has a mass of m=75 kg and its energy is equal to the energy of the gas,
, therefore his velocity must be
Lightning
Thunder
Rain
Winds
Hail
- <em>S</em><em>peed </em><em>=</em><em> </em><em>8</em><em> </em><em>m/</em><em>s</em>
- <em>Distance</em><em> </em><em>=</em><em> </em><em>3</em><em>2</em><em> </em><em>m</em>
<u>We need to find time</u>
<h3>
We know that ,</h3>
<h3>
So ,</h3>
<h3>
<u>Substuting</u><u> the</u><u> values</u></h3>
Answer:
The sound intensity of train is 1000 times greater than that of the library.
Explanation:
We have expression for sound intensity level,
A train whistle has a sound intensity level of 70 dB
We have
A library has a sound intensity level of about 40 dB
We also have
Dividing both equations
The sound intensity of train is 1000 times greater than that of the library.
Answer:
The trade winds, the prevailing westerlies, the polar easterlies.
Explanation:
There are three prevailing wind belts associated with these cells: the trade winds, the prevailing westerlies, and the polar easterlies (Fig. 3.10). Fig. 3.10 only shows the circulation cells and winds in the Northern Hemisphere