Cine rezolva dau coroana va rogg bana la 6 pls 1. Reprezentaţi grafic prin vectori următoarele forţe:
a) F 1 = 48N, verticală, în jos (1cm ↔ 8N) b) F 2 =2,5N, orizontală, spre stânga (1cm ↔ 0,5N) (1,5p)
c) Aflaţi suma vectorială dintre 1F

şi o forţă 3F

(F 3 = 16N, verticală, în sus) (1,5p)
d) Determinaţi grafic rezultanta dintre 2F şi o forţă concurentă 4F , oblică, făcând un unghi de 60 0 cu 2F şi
cu valoarea numerică F 4 = 2N (2p)
2. Aflaţi şi reprezentaţi grafic folosind o scară convenabilă tensiunea dintr-un fir de care este suspendat
un cub din sticlă (ρ=2500kg/m 3 ), cu latura 2dm.

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.