Which is an example of a chemical change? boiling water

dissolving sugar

burning wax

melting metal

What are the factors that affect the resistance of a wire?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

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