Một động cơ không đồng bộ ba pha có các thông số như sau: Pđm = 10 kW; Uđm = 220 V; Iđm = 40 A; tần số f = 50 Hz; số cực từ bằng 5; hiệu suất định mức
bằng 0,8; tốc độ định mức bằng 580 vg/ph. Động cơ làm việc ở chế độ định mức có
tổn hao sắt từ bằng 550 W, tổn hao đồng trên dây quấn roto 450 W. Tính:

seeing the graph would

in physics zero. in muscle fatigue could be high

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.