Physics, 21.09.2019 23:30, mdngndntbdnbd

When a system is heated, heat is by the system. the amount of heat added is given a sign. when a system is cooled, heat is by the system. the amount of heat is given a sign. if a gas expands, it must push the surrounding atmosphere away. thus, work is done the system and is given a sign. if a gas is compressed, then work is done the system. this work is given a sign.

Answers: 1

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 00:30, powberier6979

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Answers: 2

continue

Physics, 22.06.2019 11:30, emilyplays474

In a good thermo flask the main cause of heat loss is

Answers: 1

continue

Physics, 22.06.2019 21:20, payshencec21

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)

Answers: 3

continue

Physics, 23.06.2019 01:30, smortandsons

)consider two positively charged particles, one of charge q0 (particle 0) fixed at the origin, and another of charge q1 (particle 1) fixed on the y-axis at (0,d1,0). what is the net force f⃗ on particle 0 due to particle 1?

Answers: 2

continue

Do you know the correct answer?

When a system is heated, heat is by the system. the amount of heat added is given a sign. when a s...