A. what is the change in internal energy if 500 j of heat is added to a system and 100 j of work is done by the system? show your work.

b. describe two sets of conditions of heat and work that cause a decrease in internal energy.

c. write one or two sentences describing how a heat pump works.

d. a neatly arranged closet is a very orderly system and has low entropy. why is it safe to assume that this did not happen naturally? write one or two sentences explaining your answer.

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?

What is the difference between mass density and weight density?

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.