When two stars are bound together gravitationally and orbit a common mass, they're known as
a. constellations.
b. meteoroids.
c. galaxies.
d. binary stars.

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

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