Which of the following statements is true? The gravitational pull of Andromeda causes other galaxies to orbit around it.
The rotation of the earth makes the sun look like it is moving from east to west.
The earth's orbit makes the stars look like they move with the seasons.
all of the above

Calculate the number of molecules present in 0.750 mol of mgo.

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Which of these conditions most likely produces an unstable isotope?