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

Microwave ovens

Radios

Refrigeration unit

Plasma

What is the resistance of a switch when it is open? When it is closed?

Give examples of plants that can reproduce by vegetative reproduction.

What volume would 90 g occupy

Lightning and thunder both occur at the same time why do you see the Lightning before you hear the thunder

How many atoms of each element are in the reactants?

A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 47 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 354 J?

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8 m/s2, which gives the illusion of normal gravity during the flight.

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.

You short-circuit a 9 volt battery by connecting a short wire from one end of the battery to the other end. if the current in the short circuit is measured to be 18 amperes, what is the internal resistance of the battery?

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?