Two new planets with equal masses are discovered. planet a is twice as far from the sun as planet b. which of the following is true?
a. the gravitational pull between planet a and the sun is smaller than the gravitational pull between planet b and the sun.
b. the sun's gravitational pull on planet a is equal to its gravitational pull on planet b because distance does not affect gravity.
c. the gravitational pulls between the sun and each of the planets are the same because the masses of the planets are the same.
d. the sun will attract planet b and repel planet a.

What filament and tubules give a cell its shape

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water