D a microscope because the scientist will have to eventually view the strains up close to see the progress of the antibiotic
Answer
Physical weathering weathering is is breaking breaking up up rocks rocks by by force, force, while while chemical weathering weathering involves involves chemical chemical processes.
Explanation:
- Physical weathering refers to the mechanical weathering that takes place due to the freezing and thawing go the rocks which are exposed to hot and cold temperatures of the day and night
- An example of physical weathering is the onion peel weathering of rocks.
- While chemical weathering is the weathering by addition of oxygen, water and carbon to rock minerals.
Answer:
The answer is B
Explanation:
pretty sure I'm too late by now sorry!!
Answer: It is used to show the force between two objects caused by gravity.
Explanation: The gravitational constant appears in Isaac Newton's universal law of gravitation.
{\displaystyle G}{\displaystyle G} is about 6.67430×10−11 N⋅m2/kg2,[1] and is denoted by letter G
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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