Un cilindru orizontal cu lungimea L=1m si aria sectiunii transversale S=1 cm^2 este impartit in doua compartimente egale de un piston cu grosime neglijabila care se poate misca liber, fara frecari. Presiunea initiala in ambele compartimente este p0=10^5 N/m^2. Care este forta cu care trebuie asupra pistonului pentru a-l deplasa pe distanta x=10cm? (problema 1.2.14 din culegerea Moise Nicoara). Ajutor dau funda si coroana daca exista :)) multumesc!

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

Based on details in the riddle of the rosetta stone, which statement best describes jean-baptiste fourier’s influence on jean-françois champollion?