An experiment to determine the convection coefficient associated with airflow over the surface of a thick stainless steel castin
1 answer:
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Answer:
(a) Current density at P is .
(b) Total current I is 3.257 A
Explanation:
Because question includes symbols and formulas it can be misunderstood. In the question current density is given as below;
where and
unit vectors.
(a) In order to find the current density at a specific point <em>(P)</em>, we can simply replace the coordinates in the current density equation. Therefore
(b) Total current flowing outward can be calculated by using the relation,
where integral is calculated through the circular band given in the question. We can write the integral as below,
due to unit vector multiplication. Then,
where . Therefore
Answer:
3h12min
Explanation:
We need to apply our thermodynamics concepts to find the required time in which the ice will melt at a given temperature.
In our data we have defined that,
Performing an energy balance you have to:
Internal energy is given by,
Integrating,
Replacing the values,
<em>Note: It was assumed that fros is isothermal and the radiation exchange is also negligible.</em>