Question

某学习小组划船至湖中,他们用细线系住石块,并测出其重力为6牛,将石块放入水中,测得为3.6牛.

Answer 1

石块受到浮力F = G-F’= 6N-3.6N = 2.4 N

（2）水深h = 4.8 m

p = ρ水g h = 1.0×103kg/m3×10N/kg×4.8m = 4.8×104 Pa

（3）石块体积为V,由F = ρ水Vg 得：

V = = 2.4×10-4m3

m = = 0.6 kg

= 2.5×103 kg/m3