Which is a characteristic of a physical change?

The chemical bonds in the substance are unchanged.

The change cannot be seen.

The molecules all move at the same speed.

The substance has reacted with another substance.

A racecar is equipped with a computer that records the reading on its speedometer every second during a race. If you graph this data, what will be the best choice for the dependent variable?

Which is a better conductor, metal or non metal

A positron is an antimatter version of the electron, having exactly the same mass. When a positron and an electron meet. they annihilate, converting all of their mass into energy.

A school bus transporting students to school is an example of potential energy because it has the ability to take the students to school. kinetic energy because it has the ability to take the students to school.

Which statement is true? The moon rotates and revolves at a slower rate than the Earth. The moon revolves around the Earth faster than it rotates. The moon revolves around the Earth much slower than it rotates. The moon does not rotate at all.

Which equations represent the relationship between wavelength and frequency for a sound wave? Check all that apply. v = lambdaf A = vf f = v A = StartFraction v over f EndFraction. A = StartFraction f over v EndFraction.

Objects that are closer together have a stronger force of gravity between them. True False

What is table salt (NaCl) formed by? The combination of two nonmetals. The splitting apart of a metal and a nonmetal. The combination of a metal and a nonmetal. The combination of two metals.

How does charging by conduction work?

Explain how Copernicus concluded that stars were farther away than planets. Draw a diagram showing how this principle applies to another example.