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

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane

2select the correct answer. javed suffers from a severe food allergy. which device should javed always carry? a. inhaler b. epi pen c. nebulizer d. insulin pen