Which of the following best describes the first law of thermodynamics? Energy can be destroyed.

Energy can disappear.

Energy can be created.

Energy can be changed.

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

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem