In typical rockets the mass ratio is between 10 and 30. Imagine a rocket with a total mass of 1 ton and a mass ratio of 1000: when empty, it would only weight one kg, including its cargo, while when full it would need to contain 999 kg of fuel!
Benefits of Bee Propolis For Skin Apparently, natural bee propolis is considered good for younger, acne prone skin, as well as more mature skin. Itâs now being used as a wrinkle fighter by what seems to be a growing number of women.
Male bees are called Drones and they do not have stingers, their only purpose is to mate with the queen bee. A queen bee can sting multiple times without dying. 99% of the bee colony is made up of female bees known as worker bees. The average honey bee's wings flap over 183 times per second.