The ball is traveling 90 mph (about 40m/s) when it reaches home plate. if the ball travels at this speed the whole distance from the pitcher to the batter, how many seconds does it take? show the work and steps!

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

It is really hard for me right know

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.