A train takes 3.5 h to travel from Seattle, WA to Portland, OR, a distance of 170 miles. If 0.3 h of that time is spent stopped at stations, what is the average speed of the train when it is moving? Need a Hint?
53 mi/h

58 mi/h

61 mi/h

64 mi/h

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!