En un balancín están sentados dos niños, uno pasa 20 Kg y se sienta a 2 m del fulcro, el otro se va moviendo hasta encontrar el equilibrio a 2,5 m. ¿Cuánto pesa el segundo niño?

Summarize the work of famous environmental scientists of the past.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.

Which of the following is s good strategy to use when preparing to take notes in class