In which of the following situation is work being done? a car is pushed but does not budge. a weightlifter holds a barbell over his head. a wagon is pulled at an angle of 30 degrees to the horizontal. a swimmer treads water for 15 minutes.

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

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

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?