Question

向墙壁上按图钉,已知钉尖的面积是0.5mm2,钉帽的面积是1cm2,手对图钉帽的压强是2×103Pa.

Answer 1

1）F=ps=0.2N

2)F2=F=0.2N

3)p2=F2/s2=0.2×10^6 Pa