08. Uma pessoa deitada, tendo os olhos junto ao solo, observa um poste de baixo até em cima sob um ângulo visual de 60°.
Afastando-se 2,0 m do poste, esta passa a vê-lo sob ângulo de
45°. Podemos afirmar que a altura do poste vale:

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

The substances that are necessary for producing of certain hormones and that store and transport vitamins