A student notices that when bananas are kept near other fruits, the other fruits ripen faster. She wonders what causes the other fruits to ripen more quickly and thinks that bananas must have an influence on the ripening process. She decides to perform an experiment. She gathers bananas and apples and places an apple by itself at location A and an apple next to a banana at location B. She then waits for five days and records the how ripe each apple is. What would be the next step in this experiment? A. ask questions and construct a hypothesis B. analyze the results and make a conclusion C. construct a hypothesis and record data D. make observations and draw a conclusion

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

How air particles exert a pressure on the inside of the balloon

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.