A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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Answer:
$540, you just multiply $50 x those 6 months=$300 then you multiply $40 x those other 6 months and you get $240 and then you add 240+300=$540
Explanation:
Answer:
Saint-Domingue (Haiti) was prosperous because of revenue earned from sugar.
Explanation:
When the Europeans came to Haiti, the native people lived in a simple way and were relatively isolated from their surroundings, let alone the world. The Europeans though thought that this place has big potential, especially in farming. What the Europeans had on mind was to create large plantations with sugar cane, thus produce sugar and make a profit out of it.
While the Europeans were not many in number, and the native population was decimated, a lot of African slaves were brought as a labor force for the plantations. The wet tropical climate enabled high-scale production of sugar cane, and with sugar becoming increasingly popular and being paid well for, the Europeans earned a lot from the trade. Haiti actually became a very prosperous island, and that was strictly down to the production of sugar cane and sugar from it.
Answer:
Its center is located near the town of Chicxulub
Explanation:
is an impact crater buried underneath the Yucatán Peninsula in Mexico.[4] Its center is located near the town of Chicxulub, after which the crater is named.[5] It was formed by a large asteroid or comet about 11 to 81 kilometres (6.8 to 50.3 miles) in diameter,[2] the Chicxulub impactor, striking the Earth. The date of the impact coincides precisely with the Cretaceous–Paleogene boundary (K–Pg boundary), slightly less than 66 million years ago,[3] and a widely accepted theory is that worldwide climate disruption from the event was the cause of the Cretaceous–Paleogene extinction event, a mass extinction in which 75% of plant and animal species on Earth became extinct, including all non-avian dinosaurs.
Answer:
Gravitational force is responsible for moon revolving around the earth .
