Hai điện tích điểm giống nhau đặt trong chân không cách nhau 3 cm đẩy nhau một lực bằng 0,4N. Độ lớn của mỗi điện tích là?

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?