How to use heliocentric in your own sentence?

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?

What sort of waves exhibit the doppler effect?

You can melt ice by applying pressure because the solid/liquid line has a slope.