EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 1, Problem 1.78P
To determine
Gas pressure in cylinder B
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Figure Q1(b) Helium Ballon with two passengers
(b)
Figure Q1(b) shows nine balloons are filled with helium gas where its weighs
is only about one-seventh of what air weighs under identical condition. The
buoyancy force will push the balloon upward. Each balloon has a volume of
100 m and carries two people, 70 kg each. Assume the density of air is 1.16
kg/m. The weight of ropes and the cage is neglected. Determine the net force
acting on the balloon, the acceleration of the balloon when it is first released
and the maximum amount of load the balloon can carry.
: The cylinder shown in Fig. (2), Acytinder=7.012cm², has two pistons mounted, the upper
one, mp1 =100kg, initially resting on the stops. The lower piston (mp2 =0kg) has 2kg water
below it, with a spring (linear) in vacuum connecting the two pistons. The spring force is
zero when the lower piston stands at the bottom, and when the lower piston hits the
stops the volume is 0.3m?. The water, initially at 50kPa, V =0.00206m, is then heated to
saturated vapor. Determine:
(1) the initial temperature (2) the pressure that will lift the upper piston (3) The
condition of steam when the lower piston hits the stops (4) the work done by the water
(at saturated vapor state).
Patm=101.325kPa
Piston 1
stops
Piston 2
H:0
Fig.2
1. Two pipes A & B caries an oil of specific gravities 0.9 & 1.2 respectively. The center of the pipe A is 75 cm above the pipe B. The height of oil in right limb is 35 cm. Also, the mercury level difference is found in right limb as 60 cm. Find the pressure difference between these two pipes in kPa. Also find the pressure equivalent in water head in mm.
A. The difference of pressure between two pipes (PA-Pa) (Unit is in kPa) =
B. Equivalent to Water head in mm =
Chapter 1 Solutions
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
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