Một người đi xe đạp từ a và 1 người đi bộ từ b cùng lúc và theo cùng hướng ab người đi xe đạp đi với vận tốc v bằng 12 km/h người đi bộ với vận tốc bàn 5 km/h ab bang 14 km câu a hỏi họ gặp nhau khi nào ở đâu b vẽ đồ thị tọa độ theo thời gian thêu 2 cách chọn a làm gốc ra Trọng b làm gốc

What produces a record of seismic waves? richter scale seismogram barometer seismograph

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

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c