The density of mercury is 13.5 times greater than the density of water. if you were to build a barometer that used water instead
1 answer:
Answer:
Height of water column 10.26 m
Explanation:
Given data;
Mercury density is 13.5 times higher than water density.
Mercury barometer 76 cm or 29.92 inches
we know that the mercury column is balanced by the pressure of air in mercury barometer
we know also standard atmospheric is equivalent to 29.92 inches of mercury
Height of water column must be
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The concept required to solve this problem is that related to the Isobaric process. Isobaric process is understood as the process in which changes occur at constant pressure. From the first law of thermodynamics this can be expressed as,
Here,
P = Pressure
dV = Differential of Volume
As the Pressure is constant we have,
Replacing
Therefore the correct answer is A.
Answer: Minimum speed needed by the Olympic champion at launch if he was traveling at 6.8 m/s at the top of the arc is 11.65 m/s.
Explanation:
Velocity is only in horizontal direction at the top most point which is similar to the velocity in the horizontal direction at the time of launch.
Now, according to the law of conservation of energy the formula used is as follows.
As speed at which the person is travelling was 6.8 m/s. Hence, the initial velocity will be calculated as follows.
Thus, we can conclude that minimum speed needed by the Olympic champion at launch if he was traveling at 6.8 m/s at the top of the arc is 11.65 m/s.