A steel bar weighs 156 N, and in water 131N. What is the volume of the void in the bar?

univerkov | November 30, 2020 | education

Given: pw = 1000 kg / m3; p = 7800 kg / m3; P1 = 156 H; P2 = 131H.
Vp-?
In water P2 = mg-pv * gv = pgv-pvgv = gv (p-pw); v = P2 / g (p-pv) = 131/10 (7800-1000) = 1.926 * 10 ^ -3 m3; in air Р1 = mg = pgv1; v1 = P1 / pg = 156/7800 * 10 = 2 * 10 ^ -3 m3; then Vp = v1-v = (2-1.926) * 10 ^ -3 = 0.074 * 10 ^ -3 m3 = 74 cm3

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.