Which type of wall would make the best soundproofing for room? А. 1.0 centimeter thick glass
B. two layers of 0.5 centimeter thick glass with 0.5 centimeters of air between them
C. Two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them
D. 1.0 centimeter thick steel

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Um vetor representa um deslocamento cujo módulo é 20 m. se v faz um ângulo de 60 graus com a horizontal, qual é o valor das componentes horizontal e vertical deste vetor?

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?