Question

200 pounds of milk are heated by addition of 20,000 Btu of energy. If the milk (Cp = 0.9 Btu/lb F) has an initial temperature of 45 F, then a) what is the temperature of the milk after heating? b) If there were initially 500 lbs of milk, what would be the temperature after heating?

Answer #1

A) 100 g of ideal gas with internal energy U was mixed at 100C
with 200 g of the same gas also at 100C. This mixture was heated to
200C. We can predict that internal energy after heating in terms of
U is:
a
3.8 U
b
1.27 U
c
6 U
d
2 U
e
3 U
B) Some amount of ideal gas with internal energy U and initial
temperature 100C was compressed to half of volume meanwhile
absolute...

The Zik-Zak Corporation recently bought a heat exchanger to cool
1000 lb/h of a light oil (Cp = 0.5
Btu/lbm?F°) from 210°F to 60°F using chilled water
(Cp = 1 Btu/lbm?F°) available at 50°F. The
exchanger operates in countercurrent flow and has an area
A0= 20 ft2. When it was new, the exchanger
could operate with a water rate such that the exit temperature of
the water was 80°F; after several months of operation, the water
exit temperature has to...

During assembly, an automobile body (after painting) passes
through a radiantoven to cure and harden the finish. The oven has
the form of a long, rectangular box. The dimensions of the oven are
95 ft long, 10 ft high, and 10 ft wide. The ends are open as the
cars pass through continuously. The heated oven surfaces (the top
andboth sides) are maintained uniformly at 600°F and the initial
temperature of the car is 80°F. The surface area of the...

The calorie (4.184 J) was originally defined as the
quantity of energy required to raise the temperature of 1.00 g of
liquid water 1.00°C.The British thermal unit (Btu)
is defined as the quantity of energy required to raise the
temperature of 1.00 lb of liquid water
1.00°F.
(a) How many joules are in 1.00 Btu? (1 lb = 453.6 g; a
change of 1.0°C =
1.8°F)
(b) The therm is a unit of
energy consumption and is defined as 100,000...

Consider the CSTR with first order reaction and the process
parameters and variables are given by: The process parameters and
variables are defined as: CA0 = feed concentration = 2.7 mol/L. Cp
= heat capacity of the reactor feed and product (1000 cal/kg*K) =
Cv. E/R = normalized activation energy (20,000 K). F = mass feed
rate and product rate (10 kg/s). k0 = rate constant (1.97×10^24
1/s). Q = heat addition rate (initially 700,000 cal/s). T0 = feed
temperature...

A 200 g aluminum calorimeter can contain 500 g of water at 20 C.
A 100 g piece of ice cooled to -20 C is placed in the
calorimeter.
- Find the final temperature of the system, assuming no heat
losses. (Assume that the specific heat of ice is 2.0 kJ/kg K)
- A second 200 g piece of ice at -20 C is added. How much ice
remains in the system after it reaches equilibrium?
- Would your answer...

A local coal fired 200 megawatt electrical generating plant has
a thermal efficiency of 30% and a nuclear 150 megawatt electrical
generating plant has a thermal efficiency of 25%.
a. Calculate the waste heat emitted by each (in megawatts)
b. If the cooling water used for the nuclear plant were required
to only rise in temperature by 2o C after it absorbs the waste
heat, how much water per hour would be required to cool the nuclear
plant (in cubic...

A Carbon dioxide fire extinguisher initially contains 5.5lbm of
CO2 gas. In “real life” the CO2 would not be
all gas, but for this problem assume that it is. The CO2
gas has an initial pressure of 860psia and initial temperature of
+72oF. Immediately after putting out a fire, it has a
final pressure of 100psia and a final temperature of
-30oF. Assume ideal gas law behavior.
a) Show that the specific gas constant for CO2 gas is
approximately R=1131ft∙lbf/(slug∙R)....

Scarlett is practicing math fluency. She has 100 math operation
flashcards with 42 addition problem cards, 56 subtraction cards,
and 2 multiplication cards. Scarlett will time herself to see how
fast she can solve the problems on seven cards. She chooses her
seven cards and they are all addition cards. Is choosing all
addition cards likely? Explain by running a simulation.
Part A: State the problem or question and
assumptions. (2 points)
Part B: Describe the process for one repetition,...

Part A Calculate the fraction of methyl isonitrile molecules
that have an energy of 160.0 kJ or greater at 510 K .
Part B Calculate this fraction for a temperature of 524 K .
Part C What is the ratio of the fraction at 524 K to that at 510
K ?
Part A
What is the half-life of a first-order reaction with a rate
constant of 7.20×10−4 s−1?
Part B
What is the rate constant of a first-order reaction that...

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