hola necesito ayuda con este problema alessa compro un queso que pesaba 3/4 kilo si lo partió en porciones de 2/9 de kilo cada una ¿Cuantas porciones de quesos pudo sacar?​

Amachine, modeled as a simple spring-mass system, oscillates in simple harmonic motion. its acceleration is measured to have an amplitude of 5,000 mm/s with a fre- quency of 10 hz. compute the maximum displacement the machine undergoes during this oscillation.

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

What are similarities and differences between refraction, reflection, diffraction and absorption?