Most subcultures do not reject all of the values and practices of the larger society. Please select the best answer from the cho
2 answers:
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We are asked to determine the velocity of a rain drop if it falls from 4 km.
To do that we will use the following formula:
Where:
If we assume the initial velocity to be 0 we get:
The acceleration is the acceleration due to gravity:
Now, we take the square root to both sides:
Now, we substitute the values:
solving the operations:
Therefore, the velocity without air drag is 280 m/s.
Part B. we are asked to determine the velocity if there is air drag. To do that we will use the following formula:
Where:
We need to determine the drag force. To do that we will use the following free-body diagram:
Since the velocity that the raindrop reaches is the terminal velocity and its a constant velocity this means that the acceleration is zero and therefore the forces are balanced:
Now, we determine the mass of the raindrop using the following formula:
Where:
The volume is the volume of a sphere, therefore:
Since the diameter of the raindrop is 3 millimeters, the radius is 1.5 mm or 0.0015 meters. Substituting we get:
Solving the operations:
Now, we substitute the values in the formula for the drag force:
Solving the operations:
Now, we substitute in the formula:
Now, we solve for the velocity:
Now, we substitute the values. We will use the area of a circle:
Substituting the radius:
Solving the operations:
Now, we take the square root to both sides:
Therefore, the velocity is 8.4 m/s
Answer: Option (B) is the correct answer.
Explanation:
As we know that the temperature when the vapor pressure of liquid becomes equal to the atmospheric pressure surrounding the liquid. And, during this temperature liquid state of substance changes into vapor state.
But during this process of change in state of substance the temperature will cease to change for some time because unless and until all the liquid molecules do not convert into vapor state the temperature will not rise or change.
As the boiling point of water is so the temperature ceases to change from
to
.
Therefore, we can conclude that when heating water, during to
temperature range the temperature will cease to change for some time.