Find the average acceleration of a northbound subway train that slows from 12 m/s to 9.6 m/s in 0.9 s

2.7 m/s

-2.7 m/s2

2.7 m/s2

-2.7 m/s

Stars x and y are both bluish main sequence stars. star x has a higher absolute brightness than star y. how do the two stars compare? explain

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?