I'm pretty sure its b but i need to know as fast as possible which statement best describes universal law a)it is in effect some of all time b)it is in effect all the time c)it changes over time d)it operates under specific conditions

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air