Dust settling out of the air

chemical change or physical change

The distance between the sun and earth is about 1.5*10^11m. express this distance with an SI prefix and in kilometer

Is the temperature of a normal healthy old man is less than that of a normal healthy young man?

Rosa writes a story in which the main character turns into a mouse. Which object could she include in her story so the character can see his own face and confirm he has really turned into a mouse?

How to calculate gravitational potential energy?

What causes a tsunami to grow taller as it reaches the shore?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

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