1) A plastic block of dimensions 2.5 cm x 3.8 cm x 4.0 cm has a mass of 28.0 g. What is the density of the block? If placed into a cup of water, will the block float or sink?
2) A concrete block of dimensions 1.00 m x 2.50 m x 2.75 m has what weight in Newtons? Use 2400 kg/m^3 as the density of concrete.
3) A 13000 N vehile is to be lifted by a 25 cm diameter hydraulic piston. What force needs to be applied to a 3.5 cm diameter piston to accomplish this?
4) A perfect fluid flows through a pipe with varying radius. If at one cross section with radius 20 cm the fluid is flowing at 5.0 m/s, then what is the speed at a cross section with radius 4.0 cm?