Un bloque de masa (5 Kg), se desplaza por un plano inclinado con un ángulo de 20°, sabiendo que el coeficiente de fricción entre elplano y el bloque es de 0,3. Determine A)Fuerza normal (N), B)Fuerza de fricción (fr), C)Componente en x del peso (Px), D) Componente del peso en y (Py) y E)la aceleración del sitema (a).

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

In which of the following is positive work done by a person on a suitcase

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums