What is the rare but colorful cloud that forms about 50 miles above the earth, and when is it seen?

How far from a concave mirror must an object be placed?

Which statement below is false? A) Weight depends on the force of gravity. Eliminate B) Mass is the amount of matter in an object. C) Mass is a constant no matter where you are located. D) Weight is a constant no matter where you are located.

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

What is the difference between a solar cell and a solar panel

Which factors affect the resistance of a material? Check all that apply. length currer thickness temperature voltage

Which of the following do not involve a direction? Check all that apply. A. Time B. Velocity C. Distance D. Acceleration

What does deltaX mean in physics?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction