air moves out of the lungs because.. a.the gas pressure in the lungs becomes lower than the outside pressure as the diaphragm contracts.b. contraction of the diaphragm decreases the volume of the pleural cavity.c. the thorax is muscular.d. the volume of the lungs decreases with inspiration.e.the internal intercostal muscles decrease the thoracic cavity volume.

OneClass: air moves out of the lungs because.. a.the gas pressure in the lungs becomes lower than the...

Hot air balloons float in the air because of the difference in density between cold and hot air. Consider a balloon in which the mass of the pilot basket together with the mass of the balloon fabric and other equipment is mb. The volume of the hot air inside the balloon is V1 and the volume of the basket, fabric, and other equipment is V2. The absolute temperature of the hot air at the bottom of the balloon is Th (where Th > Tc). The balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. Assume that we can treat air as an ideal gas. Use g for the magnitude of the acceleration due to gravity. For the balloon to float, what is the minimum temperature Tmin of the hot air inside in terms of the variables given?

azurewolf793

A hydraulic has two pistons. Piston 1 has a radius of 0.7 cm andpiston 2 has a radius of 2.5 cm.

a.) Determine the area of piston 1.
___________cm2

b.) Determine the area of piston 2.
____________ cm2

c.) Determine the theoretical mechanical advantage (TMA) of thehydraulic.
___________________

d.) What does Pascal's Principle say?

1.The total amount of volume remains constant.

2.The pressure applied to an enclosed fluid is transmittedundiminished throughout the fluid and to the walls of thecontainer.

3.Fluid tends to flow faster where the pressure is lower.

4.The force per unit area.

5.The amount of fluid displaced by an object is equal to the volumethat has been submerged in the fluid.

6.The buoyant force on an object wholly or partially submerged in afluid is equal to the weight of the fluid it displaces.

e.) A pressure of 130 Pa is applied at piston 1. As a result, howmuch pressure will be exerted at piston 2?
________________Pa

f.) For a hydraulic, why does the actual mechanical advantage (AMA)tend to be less than the TMA?

1.Because of friction between the pistons and the walls of thehydraulic.

2.Because liquid is compressible.

3.Because of air drag.

4.Because it's impossible to deliver electricity at a constant rateto the hydraulic.
.
g.) What can be done to make the AMA closer to the the TMA?

1.Use superconductors.

2.Use a gas instead of a liquid.

3.Use a lubricant.

4.Make it more aerodynamic.
.

Unlock all answers

Related textbook solutions

Physics: Principles with Applications

Related questions

Weekly leaderboard