Jurinelson era um menino muito feliz e desobediente. certo dia, sua mãe, creuza, estava atrasada para trabalhar; ao sair, disse-lhe para lavar a louça na pia e o proibiu de ir para a rua jogar bola com os colegas naquela tarde. todavia, jurinelson não atendeu à sua mãe e, quando ela chegou do trabalho, ele não estava em casa. resoluta, andou em direção à rua e gritou estridentemente "j-u-r-i-n-e-l-s-o-n", o que pôde ser escutado por ele mesmo de longe. contrariando sua mãe, o menino estava na rua, suo e sem ter lavado a louça. explique o efeito doppler nessa situação.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Blank liquids and gases exert a buoyant force on objects placed in them