Question

2道初中物理浮力压强题，望解答！

Answer 1

解：1(1)F浮 = G - G` = 29.4N - 24.5N = 1.9N
(2)G排 = F浮 = 1.9N
m排 = G排 / g = 1.9N / 10N/kg = 0.19kg = 190g
v排 = m排 / q排 = 190g / 1g/立方cm = 190立方cm
v物 = v排 = 190立方cm
(3)m物 = G物 / g = 29.4N / 10N/kg = 2.94kg = 2940g
q物 = m物 / v物 = 2940g / 190立方cm = 15.5g/立方cm
解：2(1)m排 = qv = 1000kg/立方m x 0.003立方m = 3kg
F浮 = G排 = m排g = 3kg x 10N/kg = 30N
(2)G物 = F浮 + F = 30N + 14.7N = 44.7N
m物 = G物 / g = 44.7N / 10N/kg = 4.47kg
q物 = m物 / v = 4.47kg / 0.003立方m = 1490kg/立方m

Answer 2

追答

亲，给好评哦