Intro physics: two planets are 3 x 10^7 km apart. planet a has a mass of 8 x 10^24 kg. planet b has a mass of 1 x 10^25 kg. what is the gravitational force that planet a exerts on planet b?

Which changes of state do the labels represent? a: b: c:

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction