A) Qual é a perda (potência dissipada) nos cabos de cada uma das opções que foram apresentadas para a implementação do projeto de eletrificação? (veja esquemas na próxima página) (roteiro: encontre primeiro o resistor equivalente; a corrente que sai da fonte; e então a potência)

b) Em termos de potência, qual dos dois sistemas você escolheria e por quê? (Lembre-se que não é interessante ter perdas na transmissão (cabos) de energia, já que isso significa menos energia chegando nas casas).

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

If you put a helium-filled balloon in the refrigerator, what will happen?

Find v1, the speed of the fluid in the left end of the main pipe. express your answer in terms of h1, h2, g, and either a1 and a2 or γ, which is equal to a1a2.