How long will it take you to bike a 15 km trail if you average 9.3 kmph on the bike?

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

Coal contains energy. a. light b. kinetic c. chemical d. mechanical