leannadoughty06

06.05.2020 • 

Physics

A mass m of a material is heated reversibly from temperature T1 to T2 at a constant pressure of P. In this problem, we are going to determine an expression for the change in entropy, ΔS. Assume we can heat the given material infinitesimally slowly so that the process is reversible. Therefore, heat in any infinitesimal step is given by the following:
dQ = mc_p dT,
where c_p is the specific heat. In general, the heat capacity of a material can be temperature-dependent. A general temperature-dependent empirical form for the specific heat for ideal gases and incompressible liquids such as water is as follows:
c_p(T) = A + BT + CT² + DT⁻²,
where A, B, C, and D are substance-dependent constants that can be determined empirically.
(a) Write an expression for the change in entropy ΔS for the system assuming the empirically temperature-dependent form of the specific heat.
(b) Calculate the change in entropy ın call for a sample of water with mass rn = 2.2 kg and changing temperature from T1 = 21.4°C to T2 = (21.4+10)°C The specific heat c of water is 1,000 cal /kg/K.

Ответ:

idunn

23.03.2020

Physics

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Answer/Explanation:

A. Fom the dattached diagram below showing the number of flowers that have bloomed in the garden in the month of March, we can infer that the trend shows a strong positive correlation. If we attempt to draw a straight line to connect some of the points on the plot, we would realized that we're going to be having a line that slopes upward, and also points are either on the line or are at least not far from the line drawn. Having a correlation coefficient or r = 0.98, we can assume that value to be accurate because the trend shows a positive correlation that is closer to a correlation coefficient of 1.

B. A scenario that would show a casual relationship for flowers in the garden is the comparison of the numbers of flowers in the garden and the quantity, in kg of a nutrient-rich fertilizer.

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