Who created a model of the atom with electrons moving around the nucleus in fixed orbits?

Coiling wire around an iron core and applying an electric current through the wire creates a temporary magnet called an electromagnet. What would increase the strength of an electromagnet? A) Use a smaller nail. B) Use a battery with less voltage.

For every action there is an equal and opposite reaction. What does this phrase mean?

6. I just pulled up to Sheetz and filled my car up with gas. Explain the transfer of energy that would occur once I start then drive my car--consider the type of energy that exists within the gas molecules, explain the transfer of form of energy as

You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (if you run any faster, you'll be caught for running). How much time will it take to get to your class?

An example for curvilinear motion.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have

Explain Newton's First Law for the following. If you walk across the room holding a ball, when should you drop it to ensure that it lands on a target? Before, after or when you are directly on the target?