What is the name of the line drawn perpendicular to the surface where a light ray strikes?

a. incoming ray

c. normal

b. reflected ray

d. vertical

Which describes what happens when fuel is ignited in a heat engine? A. Chemical energy is converted into thermal energy B. Thermal energy is converted into solar energy. C. Solar energy is converted into chemical energy D.

Why do you think the outer planets have such extensive systems of rings and moons, while the inner planets do not?

The dominant wavelength of energy emitted by the sun is

The atomic nucleus contains two subatomic particles, the proton and the neutron. Atoms of different elements have different numbers of protons and neutrons.

The downward sliding characteristic of ridge-push is the result of

The helicopter was deformed and destroyed in the __?___ collision.

Which planets in our solar system rotate the opposite way to the others

Science fair project

What does this graph show about the relationship between mass and acceleration? As acceleration increases, mass increases. As acceleration increases, mass is unaffected. As mass is unaffected, acceleration decreases.

The measure of the distance an object travels in a certain length of time is the object's