Pedro y su madre están preparando un pastel para 4 personas cuya receta incluye 150g de harina. Sin embargo, su báscula de cocina no mide a la perfección y utilizan 130g. Dado el éxito de la receta, la semana siguiente repiten la receta en casa de su abuela para toda su familia. Lógicamente esta vez el pastel ha de ser mucho mayor, y la báscula de cocina de su abuela tampoco funciona a la perfección, por lo que de los 600g necesarios utilizan 580g. Razona en este contexto el significado de error absoluto y error relativo y en qué caso se han desviado más respecto a la receta original.

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Energy flows from the producer level to the level. is called