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____ [38]
2 years ago
6

Shani poses as the Statue of Liberty for an art class. She holds a torch above her head with her right hand and a book against h

er side with her left hand. She holds the pose for ten minutes. At the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired.
Which describes the work Shani did while she posed?(assume the starting work position is when her hand is already raised )

She did more work with her right hand than with her left because the right was held up higher.
She did no work while she posed because she did not move the torch or the book.
She did work while she posed because she was tired at the end of the session.
She did no work while she posed because she did not exert a force on anythi
Chemistry
2 answers:
viktelen [127]2 years ago
8 0
The first one, I believe!!! It is a fact that it took more energy for her left arm than her right arm to pose :) xxxx
uysha [10]2 years ago
6 0

Answer:

She did no work while she posed because she did not move the torch or the book.

Explanation:

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Komok [63]

Answer: Option (4) is the correct answer.

Explanation:

Activation energy is the minimum amount of energy required by the reactants to participate in the chemical reaction.

Therefore, reactant molecules whose energy is less than the activation energy are not able to participate in the reaction. Hence, a catalyst lowers the activation energy so that molecules with less energy can also participate in the reaction.

Thus, a catalyst is a specie that increases the reaction rate and has a lower activation energy.

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3 years ago
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3 years ago
The mass number of an atom is 15, and its atomic number is 7. The atom probably has... 8 neutrons in the nucleus. about as much
Artist 52 [7]

Answer: Option (a) is the correct answer.

Explanation:

Atomic number is the sum of only total number of protons present in an element. Whereas mass number is the sum of total number of both protons and neutrons present in an element.

For example, given atom has mass number as 15 and its atomic number is 7.

Therefore, number of neutrons present in it will be calculated as follows.

                    Mass number = no. of protons + no. of neutrons

                         15 = 7 + no. of neutrons

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Thus, we can conclude that the given atom contains 8 neutrons in the nucleus.

3 0
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Tasya [4]

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Explanation:

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Answer:

3 M

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