Answer:
We know that 20% of 400 liters is 80 liters.
so 20 is 5 divided by 100 so divided 400 by 5 and its 80
Answer:
C. Because of a warm water ocean flow
Explanation:
False. All behaviors do not occur only after conscious thoughts. According to Thomas Huxley, conscious thoughts don't do anything. This coincides with the modern view of this topic. Conscious thought is not the all-powerful controller of behavior. Moreover, the unconscious was more seen to be capable f guiding people on what to do.<span />
Answer: approximately 6.28 m
Explanation: C = 2 π r
D = 2 r
C = d = π x 2 ≈ 6.28319 m
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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