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.

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons