1. What important property of fluids necessitated the develop-
ment of fluid mechanics as an area of science separate from
standard mechanics?
2. How is pressure calculated? How does pressure change when
each of its contributing factors is increased?
3. How does pressure exerted by a solid object on a surface differ
from pressure exerted within a liquid or a gas?
4. What is the derived unit of pressure in the SI? To what combi-
nation of SI units is it equal? What pressure unit is used in
weather prediction?
5. Discuss the difference between gauge pressure and absolute
pressure. What is a gauge pressure of zero equivalent to?
6. What two factors affect the pressure in a fluid? How does grav-
ity affect each of these? What two aspects of a fluid container
do not affect fluid pressure?
7. State Archimedes's principle in your own words.
8. List the three kinds of buoyancy by comparing the densities of
the fluid and the object in the fluid. Describe what happens to
the object in each case.
9. Why is specific gravity useful?
10. (True or False) If a mercury barometer were taken into a deep
mine on a typical day, the mercury column would probably be
taller than 760 mm

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.