Spring balance measures weight not the mass of body​

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

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.

Positrons are spontaneously emitted from the nuclei of