My science fair project problem statement is: "how many pennies in a stack will shine a flashlight for the longest amount of time? "

my hypothesis is "if a stack of two pennies is connected with an argentium wire to a light source’s circuit, then it will produce light."

with this experiment, what could be my controlled and constant variables?

Karin bought illegal firearms at a gun show. at her trial, she alleged that she had committed this crime because her boyfriend had threatened to harm her and her two daughters if she did not. her lawyer asked the judge to instruct the jury that the prosecution had an obligation to prove beyond a reasonable doubt that karin had acted freely. instead, the judge told the jury that karin had the burden of proving duress by a preponderance of the evidence. who is correct?