Which of the following states Bernoulli’s principle?
1 answer:
The correct answer is <span>B. As speed of a fluid increases, the pressure within decreases.
Using formulas, Bernoulli's principle can be written as
</span>
where p is the pressure of the fluid,
its density, v its speed, and h its elevation above a reference level.
Assuming h does not change, we can see that if the speed v increases, the pressure p must decrease in order to keep constant the sum of the three terms.
Using formulas, Bernoulli's principle can be written as
</span>
where p is the pressure of the fluid,
Assuming h does not change, we can see that if the speed v increases, the pressure p must decrease in order to keep constant the sum of the three terms.
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Answer:
The energy that the truck lose to air resistance per hour is 87.47MJ
Explanation:
To solve this exercise it is necessary to compile the concepts of kinetic energy because of the drag force given in aerodynamic bodies. According to the theory we know that the drag force is defined by
Our values are:
Replacing,
We need calculate now the energy lost through a time T, then,
But we know that d is equal to
Where
v is the velocity and t the time. However the time is given in seconds but for this problem we need the time in hours, so,
(per hour)
Therefore the energy that the truck lose to air resistance per hour is 87.47MJ