A cold bottled drink ( m = 2.5 kg , c p = 4200 J/kg .K ) at 5 o C is left on a table in a room. The average temperature of the drink is observed to rise to 15 o C in 30 min. The average rate of heat transfer to the drink is 23 W 29 W 58 W 88 W 122 W
A cold bottled drink ( m = 2.5 kg , c p = 4200 J/kg .K ) at 5 o C is left on a table in a room. The average temperature of the drink is observed to rise to 15 o C in 30 min. The average rate of heat transfer to the drink is 23 W 29 W 58 W 88 W 122 W
Solution Summary: The author explains the rate of heat transfer to the drink. The initial and final temperature of the egg is 5°C.
A cold bottled drink
(
m
=
2.5
kg
,
c
p
=
4200
J/kg
.K
)
at
5
o
C
is left on a table in a room. The average temperature of the drink is observed to rise to
15
o
C
in 30 min. The average rate of heat transfer to the drink is
In adiabatic process, the
system has
Q=max. value O
W=0 O
Q=0 O
U-0 O
*
A vertical piston-cylinder device contains water and is
being heated on top of a range. During the process, 65
Btu of heat is transferred to the water, and heat losses
from the side walls amount to 8 Btu. The piston rises as
a result of evaporation, and 5 Btu of work is done by the
vapor. Determine the change in the energy of the water
.for this process
61 Btu O
52 Btu
55 Btu
60 Btu
*
hp compressor in a facility that operates at full load-75
for 2500 h a year is powered by an electric motor that
has an efficiency of 93 percent. If the unit cost of
electricity is $0.11/kWh, the annual electricity cost of this
:compressor is
16,540 $
19,180 $ O
5,380 $ O
14,300 $ O
barometric pressure or 1 atmospheric 1
pressure is equal to
1.019 kgf/cm2
1 kgf/cm2
0.9 kgf/cm2
0 kgf/cm2 O
In thermodynamics, how do you differentiate a closed system with an adiabatic system? What is the difference in the equation used for calculating heat transfer? (If you know a good book or scientific article that contains info regarding this, please include. Thank you.)
Air must be compressed in a well-insulated piston cylinder from a volume of 6.4 litres to a volume of 1 litres. If the air is initially at 398 K, what is the minimum
work per unit mass of air required to carry out this compression? Give your answer in k) to the nearest whole number. For air: Co = 1.005 kj/kg K and cy=
0.718 kj/kg K.
Chapter 1 Solutions
Heat and Mass Transfer: Fundamentals and Applications
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
First Law of Thermodynamics, Basic Introduction - Internal Energy, Heat and Work - Chemistry; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=NyOYW07-L5g;License: Standard youtube license