The milky way is an example of which type of galaxy?
a. spiral
b. irregular
c. elliptical
d. barred spiral

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?