An object at 20∘c absorbs 25.0 j of heat. what is the change in entropy δs of the object? express your answer numerically in joules per kelvin.
an object at 500 k dissipates 25.0 kj of heat into the surroundings. what is the change in entropy δs of the object? assume that the temperature of the object does not change appreciably in the process. express your answer numerically in joules per kelvin.
an object at 400 k absorbs 25.0 kj of heat from the surroundings. what is the change in entropy δs of the object? assume that the temperature of the object does not change appreciably in the process. express your answer numerically in joules per kelvin.
two objects form a closed system. one object, which is at 400 k, absorbs 25.0 kj of heat from the other object, which is at 500 k. what is the net change in entropy δssys of the system? assume that the temperatures of the objects do not change appreciably in the process. express your answer numerically in joules per kelvin.

Chapter 23, problem 075 the figure shows a geiger counter, a device used to detect ionizing radiation (radiation that causes ionization of atoms). the counter consists of a thin, positively charged central wire surrounded by a concentric, circular, conducting cylindrical shell with an equal negative charge. thus, a strong radial electric field is set up inside the shell. the shell contains a low-pressure inert gas. a particle of radiation entering the device through the shell wall ionizes a few of the gas atoms. the resulting free electrons (e) are drawn to the positive wire. however, the electric field is so intense that, between collisions with gas atoms, the free electrons gain energy sufficient to ionize these atoms also. more free electrons are thereby created, and the process is repeated until the electrons reach the wire. the resulting "avalanche" of electrons is collected by the wire, generating a signal that is used to record the passage of the original particle of radiation. suppose the radius of the central wire is 24 âµm, the inner radius of the shell 2.3 cm, and the length of the shell 14 cm. if the electric field at the shell's inner wall is 2.8 ă— 104 n/c, what is the total positive charge on the central wire?

Gather reliable information to brent make his decision. to gather this information, use newspapers, call insurance companies or look at their web sites, and review consumer magazines and web sites. also, look at the manufacturer web site or for information about gas mileage. list the sources you use and take notes.

Convection currents are caused by differences in what two things?