The document contains 8 problems involving calculations of mass, weight, density, pressure, and acceleration under different gravitational conditions on Earth and the moon. The problems cover converting between different mass, weight, pressure and volume units. All problems are multiple choice and provide the answer at the end.
The document contains 8 problems involving calculations of mass, weight, density, pressure, and acceleration under different gravitational conditions on Earth and the moon. The problems cover converting between different mass, weight, pressure and volume units. All problems are multiple choice and provide the answer at the end.
The document contains 8 problems involving calculations of mass, weight, density, pressure, and acceleration under different gravitational conditions on Earth and the moon. The problems cover converting between different mass, weight, pressure and volume units. All problems are multiple choice and provide the answer at the end.
The document contains 8 problems involving calculations of mass, weight, density, pressure, and acceleration under different gravitational conditions on Earth and the moon. The problems cover converting between different mass, weight, pressure and volume units. All problems are multiple choice and provide the answer at the end.
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Assignment No.
1. What is the mass in grams and weight in dynes and in gram-force of 12 oz of salt? Local gravity is 9.65 m/s2. (1 lbm = 16 oz)
Answer: 340.20 gm and 334.77 gf
2. A mass of 0.10 slug in space is subjected to an external vertical force of 4 lb f. If the
local gravity acceleration is g = 30.5 fps 2 and if friction effects are neglected determine the acceleration of the mass if the external vertical force is acting (a) upward and (b) downward in fps2.
Answer: (a) 9.50 fps2 and (b) 70.5 fps2.
3. The mass of a given airplane at sea level (g = 32.1 fps 2) is 10 short tons. Find its mass in (a) lbm, (b) slugs, (c) kgm, and (d) gravitational weight in lbf when it is travelling at a 50,000 ft elevation. The acceleration of gravity g decreases by 3.33 x 10-6 fps2 for each foot of elevation.
4. A lunar excursion module (LEM) weights 1500 kg f on earth where g = 9.75 m/s 2. What will be its weight on the surface of the moon where gm = 1.70 m/s2. On the surface of the moon, what will be the force in kgf what will be the force in (a) kg f and (b) in newtons required to accelerate the module at 10 m/s 2.
Answer: (a)1538.46 kgf and (b) 15,087.08 N.
3 5. The mass of a fluid system is 0.311 slug, its density is 30 lb m /ft and g is 31.90 fps2. 3 3 Find (a) the specific volume in ft /lb m , (b) the specific weight in lb f /ft , and (c) the total volume in ft 3.
3 3 Answer: (a) 0.03 ft /lb m , (b) 29,74lb f /ft , and (c) 0.33 ft 3.
6. A cylindrical drum (2-ft diameter, 3-ft height) is filled with a fluid whose density is 3 40 lb m /ft . Calculate (a) the total volume of fluid in ft 3, (b) its total mass in pounds and slugs, (c) its specific volume in ft 3 /lb m , and (d) its specific weight in lb f /ft 3. Note that the local gravity is 31.90 fps2.
3 Answer: (a) 9.42 ft 3, (b) 377.00 lb m and 11.72 slugs, (c) 0.03 ft /lb m , and 3 (d) 39.66lb f /ft . 7. A vacuum gauge mounted on a condenser reads 0.66 mHg (meter of mercury). What is the absolute pressure in the condenser in kPa when the atmospheric pressure is 101.3 kPa?
Answer: 13.31 kPa
8. Convert the following readings of pressure to kPa absolute, assuming that the barometer reads 760 mmHg: (a) 90 cmHg gage, (b) 40 cmHg vacuum, (c) 100 psig, (d) 8 inHg and (e) 76 inHg gage.
