(1)F=G=mg=2kg×9.8N/kg=19.6N
p=F/S=19.6N/10×10×10的-4次方=1960pa
(2)F=G=2mg=2×2kg×9.8N/kg=39.6N
p=F/S=39.6N/(20×10×10的-4次方)=1980pa
(1)F=G=mg=2kg×9.8N/kg=19.6N
p=F/S=19.6N/10×10×10的-4次方=1960pa
(2)F=G=2mg=2×2kg×9.8N/kg=39.6N
p=F/S=39.6N/(20×10×10的-4次方)=1980pa