Asupra unui corp de masă m=5kg care se deplasează de-a lungul axei Ox acționează o forță rezultată a cărei dependență de timp este reprezentată în figura alăturată. La momentul inițial corpul se află în repaus. vo=0
Calculați: a) accelerația corpului
b) viteza corpului la momentul t=2s
Answers: 3
Physics, 22.06.2019 18:00
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)
Answers: 3
Physics, 22.06.2019 20:10
Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.
Answers: 1
Physics, 23.06.2019 01:30
Which statements did both aristotle and ptolemy assume? check all that apply.
Answers: 1
Asupra unui corp de masă m=5kg care se deplasează de-a lungul axei Ox acționează o forță rezultată a...
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