Which statement is true about the motion of planets?

The motion from a planet's rotation causes the planet to move forward.

Gravitational force between the sun and planet cause an elliptical orbit.

Internal forces from the planets keep the planets moving.

Forces in space prevent the planets from moving. Which statement is true about the motion of planets?

The motion from a planet's rotation causes the planet to move forward.

Gravitational force between the sun and planet cause an elliptical orbit.

Internal forces from the planets keep the planets moving.

Forces in space prevent the planets from moving.

Why there is no inductive reactance in dc circuits

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87