Suppose that 300.0 J of heat is transferred by
conduction from a heat reservoir at a...
Suppose that 300.0 J of heat is transferred by
conduction from a heat reservoir at a temperature of 415.0
K to another reservoir. Calculate the entropy change if
the temperature of the second reservoir is 100.0 K
The reservoir temperatures for heat engines A through D are
given below. Rank the engines in order of increasing efficiency.
Indicate ties where appropriate.
Engine
A
B
C
D
TT hh
(K)(K)
400
440
800
1240
TT cc
(K)(K)
200
420
600
1020
Rank from largest to smallest. To rank items as equivalent,
overlap them._
Write a function to solve the two-dimensional in Matlab,
unsteady heat conduction equation with no internal heat generation
on a square domain. The length of each side of the square is 1 m.
The function will have the following 4 inputs:
npts
number of grid points in each coordinate direction
nt
number of time steps to take
dt
size of time step (s)
alpha
thermal diffusivity (m2/s)
Use the following initial and boundary conditions:
Initialize the body to T =...
1. Specific heat of water is 4.184 J/g ˚C. What is the heat in
KJ gained when 20 q of water is heated from 22˚C to 77˚C?
2. What is the heat in J to melt 100g of NaCl when the HF for
NaCl is 518 J/g?
3. What is the heat in J to equate 50 g Acetic Acid when the HE
= 390 J/g?
A 62.5 g of iron with a heat capacity of .450 J/C is heated to
100 degree C. It is then transferred to a coffee cup calorimeter
containing 52.7 g of water (specific heat of 4.184J/g C) initially
at 20.63C. if the final temp of the system is 29.59 what was the
heat capacity of the calorimeter?
A bacterial cell that transits from a reservoir or from one host
to another, is likely to encounter a range of non-optimal
conditions in its new environment. For example, it may be exposed
to damaging or toxic physical and chemical conditions. It will need
to adapt if it is to survive. Outline what these physical and
chemical properties are and give examples of how bacteria adapt to
survive in these conditions.
A sample of calcium carbonate [CaCO3 (s)] absorbs 45.5 J of
heat, upon which the temperature of the sample increases from 21.1C
to 28.5C. If the specific heat of calcium carbonate is 0.82 J/g-K,
what is the mass (in grams) of the sample?
I have this answer:
heat absorbed = mass of sample * specific heat of sample *
change in temp of the sample
45.5 = mass * 0.82 * (28.5-21.1)
mass = 7.5 g
But my main question...
Air is supplied to a convergent–divergent nozzle from a
reservoir where the pressure is 100 kPa. The air is then
discharged
through a short pipe into another reservoir where the
pressure
can be varied. The cross-sectional area of the pipe is twice
the
area of the throat of the nozzle. Friction and heat transfer may
be
neglected throughout the flow. If the discharge pipe has
constant
cross-sectional area, determine the range of static pressure in
the
pipe for which a...
You are planning to buy a heat exchanger to recover 1.3 MMBtu/hr
of waste heat from a process into a feed stream. Currently you pay
$10/MMBtu for steam to heat up this feed stream. You can install a
carbon steel shell and tube exchanger (U-tube type, with a heat
transfer area of 150 m2) into a tight spot between two other pieces
of equipment. This exchanger costs 199,757$ and will need to be
replaced in 10 years, but will have...
A heat pump-bases HVAC system can remove heat from a building
by
(a) compressing the refrigerant to make it hotter than the
outside air
(b) compressing the refrigerant to make it cooler than the
outside air
(c) expanding the refrigerant to make it hotter than the outside
air
(d) blowing the heat out of the building using a fan