Questions from Modern Physics

Q: A large cylindrical tank contains 0.750 m3 of nitrogen gas

A large cylindrical tank contains 0.750 m3 of nitrogen gas at 270C and 7.50 × 103Pa (absolute pressure). The tank has a tight-fitting piston that allows the volume to be changed. What will be the pre...

Q: The Sacramento City Council adopted a law to reduce the allowed sound

The Sacramento City Council adopted a law to reduce the allowed sound intensity level of the much-despised leaf blowers from their current level of about 95 dB to 70 dB. With the new law, what is the...

Q: At point A, 3.0 m from a small source

At point A, 3.0 m from a small source of sound that is emitting uniformly in all directions, the sound intensity level is 53 dB. (a). What is the intensity of the sound at A? (b). How far from the s...

Q: (a). If two sounds differ by 5.00 dB

(a). If two sounds differ by 5.00 dB, find the ratio of the intensity of the louder sound to that of the softer one. (b). If one sound is 100 times as intense as another, by how much do they differ i...

Q: In a gas at standard conditions, what is the length of

In a gas at standard conditions, what is the length of the side of a cube that contains a number of molecules equal to the population of the earth (about 7 × 109 people)?

Q: How many moles are in a 1.00-kg bottle

How many moles are in a 1.00-kg bottle of water? How many molecules? The molar mass of water is 18.0 g/mol.

Q: A large organic molecule has a mass of 1.41 ×

A large organic molecule has a mass of 1.41 × 10-21 kg. What is the molar mass of this compound?

Q: A fan at a rock concert is 30 m from the stage

A fan at a rock concert is 30 m from the stage, and at this point the sound intensity level is 110 dB. (a). How much energy is transferred to her eardrums each second? (b). How fast would a 2.0-mg m...

Q: A nail driven into a board increases in temperature. If we

A nail driven into a board increases in temperature. If we assume that 60% of the kinetic energy delivered by a 1.80-kg hammer with a speed of 7.80 m/s is transformed into heat that flows into the nai...

Q: You have a stopped pipe of adjustable length close to a taut

You have a stopped pipe of adjustable length close to a taut 62.0-cm, 7.25-g wire under a tension of 4110 N. You want to adjust the length of the pipe so that, when it produces sound at its fundamenta...