If an element has 7 electrons how many of them will be in the 2nd energy level

A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. 0.7 V 2 V 51 V 600 V

What is a transformer? Explain how a transformer works including specific details on step up and step down transformers

What is the relationship between the kinetic energy of molecules in an object and the object temperature

Our sun is in which stage of its life cycle? A. red giant B. main sequence C. white dwarf D. protostar

Force is defined as

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction

Use Newton's universal law of gravitation to explain why gravity is greater on Earth than on Mercury.