Questions from Modern Physics

Q: When two point charges of equal mass and charge are released on

When two point charges of equal mass and charge are released on a frictionless table, each has an initial acceleration (magnitude) a0. If instead you keep one fixed and release the other one, what wil...

Q: A very long, solid cylinder with radius R has positive charge

A very long, solid cylinder with radius R has positive charge uniformly distributed throughout it, with charge per unit volume

Q: A solid conducting sphere carrying charge q has radius a. It

A solid conducting sphere carrying charge q has radius a. It is inside a concentric hollow conducting sphere with inner radius b and outer radius c. The hollow sphere has no net charge. (a). Derive e...

Q: A solid conducting sphere with radius R that carries positive charge Q

A solid conducting sphere with radius R that carries positive charge Q is concentric with a very thin insulating shell of radius 2R that also carries charge Q. The charge Q is distributed uniformly ov...

Q: (a). Calculate the theoretical efficiency for an Otto-cycle

(a). Calculate the theoretical efficiency for an Otto-cycle engine with γ = 1.40 and r = 9.50. (b). If this engine takes in 10,000 J of heat from burning its fuel, how much heat does it discard to th...

Q: The Otto-cycle engine in a Mercedes-Benz SLK230 has

The Otto-cycle engine in a Mercedes-Benz SLK230 has a compression ratio of 8.8. (a). What is the ideal efficiency of the engine? Use γ = 1.40. (b). The engine in a Dodge Viper GT2 has a slightly hig...

Q: The coefficient of performance K = H/P is a dimensionless

The coefficient of performance K = H/P is a dimensionless quantity. Its value is independent of the units used for H and P, as long as the same units, such as watts, are used for both quantities. Howe...

Q: A refrigerator has a coefficient of performance of 2.10.

A refrigerator has a coefficient of performance of 2.10. In each cycle it absorbs 3.10 × 104 J of heat from the cold reservoir. (a). How much mechanical energy is required each cycle to operate the re...

Q: A freezer has a coefficient of performance of 2.40.

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at 25.00C to 1.80 kg of ice at -5.00C in one hour. (a). What amount of heat must be removed from the wat...

Q: A refrigerator has a coefficient of performance of 2.25,

A refrigerator has a coefficient of performance of 2.25, runs on an input of 135 W of electrical power, and keeps its inside compartment at 5°C. If you put a dozen 1.0-L plastic bottles of water at 31...