5N00EI79-3002 Fluid Mechanics and Thermophysics
Exercise set 1
20.10.2020
1. You want to determine the density of a ceramic statue. If you suspend it from a spring
scale, the scale reads 28.4 N. If you then lower the statue into a tub of water, so that it
is totally submerged, the scale reads 17.0 N. What is the statue’s density?
2. The 70 kg student balances a 1200 kg elephant on a hydraulic lift. Both pistons are
circular.
(a) What is the diameter of the piston the student is standing on?
(b) When a second student joins the first, the piston sinks 35 cm. What is the mass of
the second student?
3. A 355 ml soda can is 6.2 cm in diameter and has a mass of 20 g. Such a soda can half
full of water is floating upright in water. What length of the can is above the water
level?