Questions from Modern Physics

Q: What is the change in entropy of 0.130 kg of

What is the change in entropy of 0.130 kg of helium gas at the normal boiling point of helium when it all condenses isothermally to 1.00 L of liquid helium? (Hint: See Table 17.4 in Section 17.6.) Ta...

Q: (a). Calculate the change in entropy when 1.00

(a). Calculate the change in entropy when 1.00 kg of water at 1000C is vaporized and converted to steam at 1000C. (b). Compare your answer to the change in entropy when 1.00 kg of ice is melted at 00...

Q: A proton is placed in a uniform electric field and then released

A proton is placed in a uniform electric field and then released. Then an electron is placed at this same point and released. Do these two particles experience the same force? The same acceleration? D...

Q: Premium gasoline produces 1.23 × 108 J of heat per

Premium gasoline produces 1.23 × 108 J of heat per gallon when it is burned at approximately 400°C (although the amount can vary with the fuel mixture). If a car’s engine is 25% efficient, three-fourt...

Q: Two moles of an ideal gas occupy a volume V. The

Two moles of an ideal gas occupy a volume V. The gas expands isothermally and reversibly to a volume 3V. (a). Is the velocity distribution changed by the isothermal expansion? Explain. (b). Use Eq....

Q: A box is separated by a partition into two parts of equal

A box is separated by a partition into two parts of equal volume. The left side of the box contains 500 molecules of nitrogen gas; the right side contains 100 molecules of oxygen gas. The two gases ar...

Q: Excess electrons are placed on a small lead sphere with mass 8

Excess electrons are placed on a small lead sphere with mass 8.00 g so that its net charge is -3.20 × 10-9 C. (a). Find the number of excess electrons on the sphere. (b). How many excess electrons a...

Q: Lightning occurs when there is a flow of electric charge (principally

Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s; this la...

Q: If a proton and an electron are released when they are 2

If a proton and an electron are released when they are 2.0 × 10-10 m apart (a typical atomic distance), find the initial acceleration of each particle.

Q: You have a pure (24-karat) gold ring of

You have a pure (24-karat) gold ring of mass 10.8 g. Gold has an atomic mass of 197 g/mol and an atomic number of 79. (a). How many protons are in the ring, and what is their total positive charge?...