You are given an unknown solid substance of mass 1,300 g and you want to estimate its specific heat. Unfortunately, you do not have a thermometer handy. Instead, you throw the substance in a bucket of boiling water. After a while, you remove the substance from the boiling water and put it into a beaker with 400 mL ethyl alcohol at room temperature. Immediately after adding the hot substance into the beaker, the volume scale reads 430 mL. When the alcohol and the substance reach equilibrium, the volume scale reads 429 mL. What is the specific heat of the substance?

a. ≈ 4056.82 J/kg. K
b. ≈ 530 J/kg. K
c. ≈ 470.8 J/kg. K
d. ≈ 1639.9 J/kg. K
e. ≈ 1560.3 J/kg. K

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?