Questions from Modern Physics

Q: You blow up a spherical balloon to a diameter of 50.

You blow up a spherical balloon to a diameter of 50.0 cm until the absolute pressure inside is 1.25 atm and the temperature is 22.0°C. Assume that all the gas is N2, of molar mass 28.0 g/mol. (a). Fi...

Q: (a). Compute the increase in gravitational potential energy for a

(a). Compute the increase in gravitational potential energy for a nitrogen molecule (molar mass 28.0 g/mol) for an increase in elevation of 400 m near the earth’s surface. (b). At what temperature is...

Q: Consider a sound wave in air that has displacement amplitude 0.

Consider a sound wave in air that has displacement amplitude 0.0200 mm. Calculate the pressure amplitude for frequencies of (a). 150 Hz; (b). 1500 Hz; (c). 15,000 Hz. In each case compare the resu...

Q: A pipe closed at both ends can have standing waves inside of

A pipe closed at both ends can have standing waves inside of it, but you normally don’t hear them because little of the sound can get out. But you can hear them if you are inside the pipe, such as som...

Q: A commonly used potential-energy function for the interaction of two

A commonly used potential-energy function for the interaction of two molecules (see Fig. 18.8) is the Lennard-Jones 6-12 potential: where r is the distance between the centers of the molecules and U...

Q: (a). What is the total random translational kinetic energy of

(a). What is the total random translational kinetic energy of 5.00 L of hydrogen gas (molar mass 2.016 g/mol) with pressure 1.01 × 105 Pa and temperature 300 K? (Hint: Use the procedure of Problem 18....

Q: It is possible to make crystalline solids that are only one layer

It is possible to make crystalline solids that are only one layer of atoms thick. Such “two-dimensional” crystals can be created by depositing atoms on a very flat surface. (a). If the atoms in such...

Q: The surface of the sun has a temperature of about 5800 K

The surface of the sun has a temperature of about 5800 K and consists largely of hydrogen atoms. (a). Find the rms speed of a hydrogen atom at this temperature. (The mass of a single hydrogen atom is...

Q: (a). Show that a projectile with mass m can “

(a). Show that a projectile with mass m can “escape” from the surface of a planet if it is launched vertically upward with a kinetic energy greater than mgRp, where g is the acceleration due to gravit...

Q: (a). The temperature near the top of Jupiter’s multicolored cloud

(a). The temperature near the top of Jupiter’s multicolored cloud layer is about 140 K. The temperature at the top of the earth’s troposphere, at an altitude of about 20 km, is about 220 K. Calculate...