Why do physicists use models?

How might using water saving appliances, like dishwashers and washing machines, affect our supply of groundwater?

What is the magnitude of the dipole moment formed by separating a proton and an electron by 100 pm

Laura and Elana are discussing how to solve the following problem: "A canary sits 10 m from the end of a 30-m-long clothesline, and a grackle sits 5 m from the other end. The rope is pulled by two poles that each exert a 200-N force on it.

Problem: Consider a particle with initial velocity v⃗ that has magnitude 12.0 m/s and is directed 60.0 degrees above the negative x axis. What is the x component vx of v⃗ in meters per second?

A farmer tosses a rope over a beam at the top of a barn. He ties one end of the rope to a bale of hay. He then raises the bale up to the barn loft by pulling down on the loose end of the rope.

From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones, we conclude that

A uniform electric field is oriented in the - z direction. The magnitude of the electric field is 6500 N/C.

1. A type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling is called a

A 50 kg student climbs 3m to the top of a set of stairs. Calculate the change in the student's gravitational potential energy from the bottom to the top of the stairs.

Which of the following is NOT an appropriate acceleration unit? A) year/day/mile B) meter/sec/sec C) mile/hour/sec D) centimeter/sec/year