Convection can occur in which two substances?

a) wood and air

b) ice and wood

c) water and ice

d) air and water

Which of the following is true about mixtures and compounds? A. Mixtures and compounds are both made of two or more different substances. B. A mixture contains different substances that are not chemically combined with one another. C.

Why did scientists develop modles of atoms?

How much force would you need to cause a 20kg object to accelerate in a straight line to 20m/s2?

The power (P) required to run a motor is equal to the voltage (E) applied to that motor times the current (I) supplied to the motor.

9. Magnesium 9 (Mg), Calcium (Ca) and Barium (Ba) are all in the same group on the periodic table. What do these elements have in common? A. They all have the same atomic number B. They all have the same number of electrons C.

A rock with a mass of 1000 kg falls to the earth. what would the force be?

What is an example of a system and describe the energy flow through it.

If a substance cannot be physically separated into component parts, it is likely to be

Gasoline being converted into heat energy and mechanical energy is an example of : A) Energy transformation B) Radiation C) Renewable resources

We use electrical devices leopard deuce motion, light, and sound. Which aspect of energy explains why these devices are possible?