Ejercicio 1 De las siguientes afirmaciones, indica cuales son verdaderas y cuales falsas. En caso de ser falsas justifica. a- Las fuentes de luz crean energía. b- Un tubo de luz es una fuente de luz natural y luminiscente. c- La sombra se forma por interponer un objeto translúcido en un haz luminoso. d- La 2da Ley de la reflexión establece que el ángulo de incidencia es igual al ángulo de reflexión. e- El ángulo de incidencia, es el ángulo que forma el rayo incidente con el espejo. f- El fenómeno de refracción sucede cuando la luz pasa de un medio trasparente a otro.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

What is the single most important equation in all of physics?

Earth's atmosphere is composed of mostly two gases. name the two gases that make up the majority of the atmosphere and use the pie chart to tell the percentages of each.