1. O sursă de oscilații aflată într-un mediu elastic produce unde plane de forma y=50sin(4nt) (mm). Lungimea de undă a undelor longitudinale produse este 1=2 m. Să se afle: a. după cât timp va începe să oscileze un punct situat la distanța x=6 m fată de sursă? b. defazajul între sursă şi punctul de la a. c. distanța dintre două puncte dacă oscilațiile sunt defazate între ele cu t/6

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?

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z