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Gabarito QUESTÃO 1 O intervalo de tempo procurado ?dado pelo tempo gasto pela onda sonora para percorrer a dist?cia Dd = (12,780 - 12,746) m = 0,034 m = 34 x 10 -3 m. O intervalo de tempo ser?ent?:DT = (Dd)/v som = (34 x 10 -3 )/340 = 10 -4 s QUESTÃO 2 a) Sobre a carga atuam duas for?s. A for? T que o cabo faz sobre o corpo e a for? , peso da carga. Utilizando a segunda lei de Newton, temos que onde ?um vetor unit?io na dire?o vertical e para cima. b) N?. Pois o helic?tero poderia estar subindo aceleradamente ou descendo retardadamente (lembre-se de que n? sabemos a velocidade do helic?tero). QUESTÃO 3 Em qualquer das situa?es, o dens?etro estar?em equil?rio sob a a?o das for?s , o seu peso, e , o empuxo que sobre ele atua. O m?ulo do empuxo, que ?igual ao peso do l?uido deslocado, ?ent? igual ao m?ulo do peso do dens?etro tanto antes como depois de batizar o ? cool. Quando a ?ua ?adicionada ao ?cool, a mistura resultante torna-se mais densa do que a mistura anterior. Portanto, o volume do ?coool batizado deslocado ?menor do que o volume do ?cool hidratado padr? deslocado, fazendo com que a marca fique acima da superf?ie livre.
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