A piece of metal of volume 250 centimetre cube floats in water when 85 percent of its volume is under water.Calculate the upthrust on the metal.
[pw=1.0gcm^-3]
Vb = 0.85 * 250 = 212.5 cm^3 = Vol. below surface. = Vol. of water displaced.
V*D = 212.5cm^3 * 1g/cm^3 = 212.5 grams of water displaced.
Upthrust = M*g = 0.2125 * 9.8 = 2.08 N.