Write down short notes on:
d. Mechanical energy

What is hidden during a lunar eclipse? isn't the moon hidden?

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point