Homework Problems
1 What is the difference between pound-mass and pound-force?
2 A woman weighs 180 lbf at a location where g = 32.10 ft/s2. Determine her weight on the moon
where g = 5.47 ft/s2.
3 A 3 kg plastic tank that has a volume of 0.2 m3 is filled with liquid water. Assuming the density of
water is 1000 kg/m3, determine the weight of the combined system.
4 Determine the mass and the weight of the air contained in a room whose dimensions are 6 m X
6 m X 8 m. Assume the density of air is 1.16 kg/m3.
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