What energy conversion occurs when a sling shot is used to shoot a rock across the room

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

How much energy is made when a pice of wood burns. how do you know

How are isotopes of the same chemical element alike? how are they different?