Avertical piston-cylinder assembly containing a gas is placed on a hot plate. the piston initially rests on stops and has a mass of 50 kg, while atmospheric pressure is patm = 101.325 kpa. let the area of the piston be a = 0.01 m2 and assume that gravity is g = 9.81 m/s2 . a) (5 pts) at what pressure, in kpa, will the piston begin to rise? b) (5 pts) assume the piston rises 10 cm. if the amount of work done by the gas equals the change in total energy of the piston, how much work has been done, in j?

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

Connie has $660,000 she wants to save. if the fdic insurance limit per depositor, per bank, is $250,000, which of these way is distributing her money between three banks will guarantee that all of her money is insured ?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.