What simple machine would you use to get rid of branches on a tree?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

If the new moon happens on january 15th, what shape will it be on february 6th?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?