Plz i need help!! So plz look at the photo real good! So plz write the type of force and write a description about the pic or type of force already written ! Will give brainliest to the first one to answer! Plz write proper answer

How many atoms or molecules are there in a mole of a substance?

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box

If a 20.0ml test tube measures 15.0cm, what is the length in meters?