The m = 12.0 kg block in the figure(Figure 1) is held in place by the massless rope passing over two massless, frictionless pulleys. Find the tensions T1 to T5 and the magnitude of force F⃗ . Enter your answers numerically separated by commas.

what is the question?

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

resonant frequency

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.