SOLUTION MANUAL OF
THERMODYNAMICS
Chapter 1
1. What is the mass in grams and the weight in dynes and in gram-force of 12 oz
of salt? Local g is 9.65m/s2 1lb = 16oz
Given:
m= 12 oz
g= 9.65 m/s2
= 965 cm/s2
Solution:
1 lbm 453.60 g
(a) 12 oz x x = 340.2 g
16 oz 1 lbm
(b) Fg = mg/k
(340.2 g)(965 cm/s2 )
= (gm)(980.66 cm/s)
gf
Fg = 334.80 gf
980.66 dynes
(c) Fg = 334.80 gf x = 328324.97 dynes
1 gf
2. A mass of 0.10 slug in space is subjected to an external vertical force of 4 lb. If the
local gravity acceleration is g = 30.5 fps2 and if friction effects are neglected,
determine the acceleration of the mass if the external vertical force is acting (a)
upward (b) downward.
Given:
g= 30.5 ft/s2
m= 0.10 slug x
F= 4 lbf
, 32.174 lbm
=
1 slug
3.2174 lbm
THERMODYNAMICS
Chapter 1
1. What is the mass in grams and the weight in dynes and in gram-force of 12 oz
of salt? Local g is 9.65m/s2 1lb = 16oz
Given:
m= 12 oz
g= 9.65 m/s2
= 965 cm/s2
Solution:
1 lbm 453.60 g
(a) 12 oz x x = 340.2 g
16 oz 1 lbm
(b) Fg = mg/k
(340.2 g)(965 cm/s2 )
= (gm)(980.66 cm/s)
gf
Fg = 334.80 gf
980.66 dynes
(c) Fg = 334.80 gf x = 328324.97 dynes
1 gf
2. A mass of 0.10 slug in space is subjected to an external vertical force of 4 lb. If the
local gravity acceleration is g = 30.5 fps2 and if friction effects are neglected,
determine the acceleration of the mass if the external vertical force is acting (a)
upward (b) downward.
Given:
g= 30.5 ft/s2
m= 0.10 slug x
F= 4 lbf
, 32.174 lbm
=
1 slug
3.2174 lbm
