Why metal wire coated with plastic or rubber is used in electric circuits

Write down the total momentum for two marbles of mass, m, both moving at velocity, v. What is the kinetic energy of the system.

what happens when tectonic plates move away from each other? A. molten matter cools and sinks towards the core B. lava travels way from the crust and forms the mantle C. molten matter seeps through crust and forms new land D.

Which of the following represents a system that is completely open? A. a pressure cooker B. a pressurized canister of helium gas C. a capped soda bottle D. a port of boiling water

Charged particles posses a region of influence also called a (an) a. force b. motion c. field d. electricity

Color is a result of the absorption and reflection of light. A shirt appears a color because it reflects that color of light. A shirt appears black when it absorbs all wavelengths of light. Why does a shirt appear white outside on a sunny day? A.

What's the net force acting on an 18-kg object if an acceleration of 3.0 m/s2 is produced?

What type of force slows you down as you slide across the floor? A. Strong nuclear force B. Friction C. Magnetic force D. Gravity

Scenario A: A ramp is used to lift a refrigerator a height of 12 m with a force of 110 N. The ramp is at an angle of 50° to the ground. Scenario B: A ramp is used to lift a refrigerator a height of 13 m with a force of 120 N.

The sun is 30 degrees above the horizon. it makes a 51 m long shadow of a tall tree. part a how high is the tree?

What can destroy stuff yet does not have any mass