Blood plasma flows from a bag through a tube into a patient's
vein, where the blood pressure is 10 mmHg. The specific gravity of
blood plasma at 37°C is 1.03. What is the minimum elevation the bag
must have so the plasma flows into the vein?
Many people have imagined that if they were to float the top of
a flexible snorkel tube out of the water, they would be able to
breathe through it while walking underwater. However, they
generally do not consider just how much water pressure opposes the
expansion of the chest and the inflation of the lungs. Suppose you
can barely breathe while lying on the floor with a 370 N weight on
your chest. How far below the surface of the water could your chest
be for you to still be able to breathe, assuming your chest has a
frontal area of 0.070 m2?
A hydraulic lift is used to raise an automobile of mass 1550 kg.
The radius of the shaft of the lift is 8.0 cm and that of the
piston is 1.0 cm. How much force must be applied to the piston to
raise the automobile?
A homogeneous solid object floats on water with 80% of its
volume below the surface. The same object when placed in a second
liquid floats on that liquid with 70% of its volume below the
surface. Determine the density of the object.
A helium balloon lifts a basket and cargo of total weight 2410 N
under standard conditions, at which the density of air is 1.29
kg/m3 and the density of helium is 0.178
kg/m3. What is the minimum volume of the balloon?
A ship sails from seawater (specific gravity 1.025) into
freshwater and therefore sinks slightly. When its load of 570,000
kg is removed, it returns to its original level. Assuming that the
sides of the ship are vertical at the water line, find the combined
mass of the ship and cargo before it was unloaded.