What is the difference between direct current and alternating current?

The first scientist to show that atoms emit any negative particles was

Scientist have changed the model of the atom. what experimental evidence led them to change from the previous model.

How far is the center of mass of the pluto-charon system from the center of pluto?

A ball (mass 0.40 kg) is initially moving to the left at 30 m/s. After hitting the wall, the ball is moving to the right at 20 m/s. What is the impulse of the net force on the ball during its collision with the wall? A) 20 kg.

An eight-sided object submerged in water would have pressure applied in how many directions?

How does the overtone number relate to the standing wave pattern number

Which of the following statements about Em waves is true? A. Em waves all have the same speed B. Em waves all have the same wavelength C. Em waves only travel through water D. Em waves all have the same amount of energy

A teacher has asked four students to state a scientific theory. Which student is correct?

What are the two main currents that affect the US on the east and west coast?

What role do volcanoes play in the flow of energy and cycling of matter on earth?