Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30 newtons. what must the input force be? 15 n20 n40 n60 n

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Bahan yang digunakan mencegah terjadinya polarisasi pada batu baterai a.larutan h2so4b.mncl2 dan serbuk karbonc.pbso4d.nh4cl