Can someone please help me?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?

Which of the following is not used to measure wind? oa. psychrometero b. wind socko c. weather vaneo d. anemometer