...釋放電子，令circuit內有電流。 其實light with energy below the threshold does not eject electrons呢句係啱的。 之後the current flow is near zero呢句係...
...a rocket When burning the fuels, hot gases is ejected downward from the bottom of the rocket and gives out a great force which is...
Do check your question.... it should be 25 kg of water ejected in 1 second. The change of momentum in 1 s = 15 x 25 Ns = 375...
16. (a) Consider a 1 second interval, mass of gas ejected = 250 kg Hence, change of momentum of gas = 250 x 2000 kg.m/s = 500,000 ...
As 0.5 kg water is being ejected at 10 m/s. So, rate of change of mass of the rocket, m/t is 0.5 kg...
...at high temperature. The gas (air) inside each engine is under compression, ejecting out to the cool atmosphere at high speed under high pressure. The exhausted...
... by atoms close to the surface of the illuminated substance, the ejected electrons from atoms only need to do work against the work-function of...
