1-7E The weight of a man on earth is given. His weight on the moon is to be determined.
Analysis Applying Newton's second law to the weight force gives lbm 5.210lbf 1ft/slbm 174.32ft/s 10.32lbf 21022=⎟⎟⎠⎞⎜⎜⎝⎛⋅==⎯→⎯=gWmmgW
Mass is invariant and the man will have the same mass on the moon. Then, his weight on the moon will be
lbf 35.8=⎟⎠⎞⎜⎝⎛⋅==22ft/slbm 174.