A brisk walk has a constant speed of 1.7 m/s. how far could a person walk in 160 seconds?
1 answer:
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Answer:
9 kilojoules of energy are stored in a kilogram of concrete due to sensible heat.
Explanation:
In this exercise we need to determined the sensible heat store in a kilogram of concrete due to a change in temperature. Sensible heat (), measured in kilojoules, is defined by the following expression:
(1)
Where:
- Mass, measured in kilograms.
- Average specific heat of concrete, measured in kilojoules per kilogram-degree Celsius.
,
- Initial and final temperatures of concrete, measured in degrees Celsius.
If we know that ,
,
and
, then the energy store in a kilogram of concrete is:
9 kilojoules of energy are stored in a kilogram of concrete due to sensible heat.
Answer:
1.28 m
Explanation:
Generally, pressure of fluid is given by
where g is acceleration due to gravity, h is the height and
is the density
Considering that the pressure for mercury is same as for blood only that the height and density of fluid are different then
Since g is constant, then
Making the subject of the formula then
Where subscripts m and b denote mercury and blood respectively
Assuming density of blood is 1060 Kg/m3, density of mercury as 13600 Kg/m3 and substituting height of mercury for 0.1 m then