Cho cơ cấu tay quay con trượt ABC như hình; Khâu dẫn AB quay đều với vận tốc góc ω1= 10 rad/s; Kích thước và vị trí cơ cấu như sau: AB = 0,5m; ABC = 900; BAC = 600Tìm vC; ω2; aC; ε2= ?và nghiệm lại kết quả bằng phương pháp tâm vận tốc tức thời.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Hydrogen and helium are both members of?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n