I WILL BRAINLIST AND GIVE 20 POINTS! help pls

Why is a match used in the Cloud in a jar experiment?
The purpose of the match was used to create what effect?

you can google it just pls help me out

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Awalk up the phase change graph worksheet

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.