A20-cm-diameter vertical cylinder is sealed at the top by a frictionless 23 kg piston. the piston is 86 cm above the bottom when the gas temperature is 307°c. the air above the piston is at 1.00 atm pressure.
a) what is the gas pressure inside the cylinder?
b) what will the height of the piston be if the temperature is lowered to 13°c?

Which best represents the law of conservation of mass ?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?