She does work from the moment she touches the book until she lets it go. Work is anything that requires energy. Therefore, she is working as she picks up the book, carries it, and when she is lifting it onto the shelf.
Answer:
Image result for In covalent bonds what is being shared
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
1. It will take 0.45 s for the bowling ball to fall 1 m
2. it will take 0.45 s for the ping pong ball to fall 1 m
<h3>Data obtained from the question</h3>
From the question given above, the following data were obtained:
- Height (h) = 1 m
- Acceleration due to gravity (g) = 9.8 m/s²
- Time (t) =?
<h3>How to determine the time taken to fall</h3>
The time taken for the bowling ball to fall can be obtained as illustrated below:
h = ½gt²
1 = ½ × 9.8 × t²
1 = 4.9 × t²
Divide both side by 4.9
t² = 1 / 4.9
Take the square root of both side
t = √(1 / 4.9)
t = 0.45 s
Thus, it will take 0.45 s for the bowling ball to fall.
Considering the ping pong ball, it will also take 0.45 s to fall 1 m since the same gravity is acting on it
Learn more about motion under gravity:
brainly.com/question/22719691
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Answer:
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Explanation: