m = Vρ = 0.016m3 * 2.5 * 103kg/m3 = 4.12kg
G = mg = 4.12kg * 10N/kg = 41.2N
F = G = 41.2N
P = F/S = 41.2N / 0.2m2 = 206 Pa
当这块大理石平放在地面上时,它对地面的压强是______206_______Pa.
2)、3) 多少个动滑轮?多少个定滑轮?
m = Vρ = 0.016m3 * 2.5 * 103kg/m3 = 4.12kg
G = mg = 4.12kg * 10N/kg = 41.2N
F = G = 41.2N
P = F/S = 41.2N / 0.2m2 = 206 Pa
当这块大理石平放在地面上时,它对地面的压强是______206_______Pa.
2)、3) 多少个动滑轮?多少个定滑轮?