Situación problemática No 2.- Un extremo de una varilla de hierro de 60 cm de largo y con un área en su sección transversal de 4 cm, se mantiene a 31 °C y el otro extremo de la varilla está a 195 °C, ¿cuánto calor
fluye a través de la varilla en 45 minutos? Dar el resultado en calorías y en kilocalorías.​

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

How do you know how many valence electrons an atom has?

What is the state of matter with a specific volume but no definite shape