Un cuerpo de 3,5 kg se encuentra en reposo sobre un plano inclinado 37o. Está sujeto al extremo superior del plano inclinado mediante un muelle de constante recuperadora 15 N/m. Sabiendo que el coeficiente de rozamiento vale 0,6, calcula el alargamiento del muelle. Sol: 42 cm.

1,1 m

Explanation:

Dado que;

coeficiente de fricción = 0,6

sabemos que W = R = mgcos 37 = 3.5Kg * 10m / s ^ 2 * cos37 = 27.95 N

coeficiente de fricción = fuerza / reacción normal (R)

Fuerza = 0.6 * 27.95 N

Fuerza (F) = 16.77 N

Recuerda que F = Ke

dónde;

K = constante de fuerza (15N / m)

e = extensión (lo desconocido)

e = F / K

e = 16,77 N / 15 N / m

e = 1,1 m

B) Contacting Energized Sources

Explanation:

A worker standing on a freshly mopped floor is adjusting products on a metal shelf. There is an exposed wire in contact with the shelving. What is this an example of?

Select the best option.

A) Contacting Overhead Power Lines

B) Contacting Energized Sources

the source which is in contact with the metal and that is in contact  with the worker. Note that the worker's body conducts electric charges and then in contact with a wet floor . the floor will certainly conduct electricity

this is an example of contacting an energized source and not contacting overhead power lines as there are no such case in the scenario stated