71 Un mobil se deplasează pe o dreaptă plecand din punctul de coordonată +10 m si ajunge in punctul de coordonată - 10 m, in timp ce alt mobil pleacă pe aceeasi dreaptă din punctul de coordonată 10 m și ajunge in punctul de coordonată +10 m. Prin ce se aseamănă si prin ce se deosebesc miscarile acestora? plAm nevoie repede.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Aviolently rotating column of air is formed around a region of extremely low air pressure above land. which of these weather conditions is most likely to follow? blizzard cyclone tornado hurricane

Which of the following can enter and exit a closed system? a. matter and energy b. neither energy nor matter c. matter but not energy d. enrgy but not matter