An iron block of unknown mass at 185°F is dropped into an insulated tank that contains 0.8 ft of water at 70°F. At thesame time, a paddle wheel driven by a 300-W motor is activated to stir the water. Thermal equilibrium is established after10 min with a final temperature of 75°F. Use data from the tables.Determine the mass of the irnn block. (You must provide an answer before moving on to the next part.)The mass of the iron block islbm.

At first, determine the mass of water, mw, in which the iron block is dropped.

Answered: An iron block of unknown mass at 185°F…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A 0.1 kg block of pure copper at a temperature of 250°C is dropped into a 4°C water bath. The bath contains 0.03 m^3 of water and is well insulated. Find the final temperature after the block and the water reach thermal equilibrium. (It is reasonable to assume the following: the specific heat of water is equal to the value at 4°C; the specific heat of the material in the block can be taken to be a constant value evaluated at a temperature mid-way between the initial temperatures of the block and the water.)
By writing E and S as functions of T and P, obtain the following expressions for the differentials dE and dF: dE = (CP-PVb)dt + V(kb-bT)dP and dF = -(PVb+S)dT+PVkdP. β and κ are the isobaric thermal expansion coefficient and the isothermal compressibility, respectively.
N = 0 An insulated tank of volume 10+(10+N)/25 m and with a valve was filled with perfect tri- atomic gas at pressure 10 bar, where N is equal to the last two digitals in your student's ID number. Initially the valve was closed. A paddle wheel was mounted inside the tank and was run by 20 kW engine. The paddle wheel was turn on and at the same time the exit valve was opened. The gas temperature was constant though the whole process (due to very slow flow) and equal to 300 K. Calculate the time needed to decrease the pressure in the tank to 5 bar.
A real gas exists at 130 C and 1.2 MPa. It is known that the critical temperature and critical pressure of the gas is 374.2 k and 4.059 MPa. It is also know that the ideal gas constant (R) of the gas is 0.12 kPa-m/ S/kg-K. In the question that follows, select the answer that is closest to the true value. Use the compressibility factor (Z) to determine the specific volume in units of m/kg. ,3, Tuesday Dece mber 7 2021 5:52:58 DM CST

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