Пуля выпущена вертикально вверх со скоростью 400м/с. на какой высоте звук догонит пулю? сопротивление воздуха не учитывать.

Дано v1=400 м/с   v2=340 м/с   h - ? h=v1*t - g*t^2/2 h=v2*t g*t^2/2=t*(v1-v2) t=2*(v1-v2)/g=2*60/10=12 c h=340*12=4080 м h=400*12 -5*144=4080 м

На языкеперевод на языкwhere i want to goкуда я хочу поехать“the world is a book, and those who do not travel read only one page”. i absolutely agree with this quotation. i have always wanted to know more about the world, to see new places, to discover new sights, to learn more about different cultures. luckily, my parents also like travelling, so each year during long summer vacations we pick one city or country to visit. if it was my turn to choose, i would pick egypt, as i want to see one of the oldest constructions in the world – the pyramids and the sphinx. if i was an archaeologist, i would definitely try to find out more on how and when exactly they were built. there are so many myths about these sites that it is hard to know for sure which information is true. i know that the largest pyramid, the pyramid of khufu at giza, is considered to be one of the seven wonders of the ancient world, which still exists. speaking of the great sphinx, it is the oldest known monumental sculpture and the largest monolith statue in the world. how these attractions were built is a source of constant speculation and debate. some say they were built by ancient egyptians, while other researchers think that this tremendous amount of brute labor is beyond human power. it is believed that egyptian pyramids were built between 2589 bc and 2504 bc. they are now a visual testament to ancient planning and engineering. the sphinx is associated with king khafre, who ruled over 4,500 years ago. the sphinx has a human head but the body of a lion and it was carved out of a huge white stone. i would really love to see these structures myself. there were other world wonders, such as the hanging gardens of babylon or the colossus of rhodes, but none has lived up to present days.

Дано:                                                                                       си v (воды)=50 мл                                              50*10⁻⁶ м³ m=113 г                                                                  113*10⁻³ кг v сар.= 120 см³                                            120*10⁻⁶ м³ p(вод ы)=1000 кг/м³ p(сардельки)=?                                                         решение p(сард.)=m (сар.)/v( где m (сар.) – масса сардельки, v(сар.) - объем сардельки m (сар.)=m-m(воды), где m(воды)=p(воды)* v(воды) =1000*50*10⁻⁶=50*10⁻³ ( м³), тогда m (сар.)=m-m(воды)= 113*10⁻³ - 50*10⁻³ = 63*10⁻³ (кг) кот съел половину сардельки, значит v сар.= 120*10⁻⁶ м3/2=60* 10⁻⁶ м³ p(сард.)=m (сар.)/v(сар.)= 63*10⁻³/ 60*10⁻⁶=0,063/0,00006=1050 кг/ м³ ответ: p(сард.)= 1050 кг/ м³