Pentru încălzirea apei (c apă = 4 180 J/kg·K) cu Δt = 80 °C se folosește o instalație de încălzire în care se arde o masă m = 6,2 g de alcool etilic, cu puterea calorică q = 27

MJ/kg. Știind că pierderile de căldură sunt de 40%, determină masa de apă care a

fost încălzită.

Describe the path of the electric current through a circuit?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?