Hallar la fuerza se debe aplicar a una palanca de primer género para levantar un peso de 456 kp, cuyos brazos de fuerza y resistencia son: 180 y 36 cm respectivamente:
ALTERNATIVAS:
A) 14,21 kp
B) 229 kp
C) 91,2 kp
D) 76 kp
E) 85 kp

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