Between nichrome wire and copper wire , which is the best conductor?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.