Which of the following does not use electromagnetic radiation? (Check all that apply)

Microwave ovens

Radios

Refrigeration unit

Plasma

A change in which of the following effects the weight of an object? -momentum -velocity -acceleration due to gravity -friction

Descriptive investigations involve collecting data about a system, but not making observations.

Two glasses of water have the same thermal energy. must they have the same temperature? explain.

What happens to the force of gravity between two masses if one mass is decreased? A. it decreases B. It stays the same C. it fluctuates

Sound waves are a type of mechanical wave and can therefore travel through space because they do not require a medium. True False

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron

Which is an example of transfroming potential energy to kinetic

Place the ball in the plastic bag, and twist the top so the ball is secure in the bag. Wrap the twisted portion with tape so it stays tight. Use the hole punch or scissors to poke a hole in the part of the bag that's above the ball.