một trường học sử dụng hệ thống camera giám sát được cấp điện bằng điện lưới quốc gia để hệ thống đó có thể hoạt động liên tục cả trong điều kiện mất điện lưới thì cần ???

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little