Beth and Richie unloaded books from boxes on the floor and put them on shelves 1 m above the floor. Beth unloaded 20 kg of books in 10 min, and Richie unloaded 20 kg of books in 20 min. Which person did more work, and which person used more power? Explain your answer.

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Answer explain why it is not possible to deduce a complete order of reactivity.