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Romashka-Z-Leto [24]
3 years ago
11

The image shows Mary happily swinging in the park. There are

Chemistry
1 answer:
Alexeev081 [22]3 years ago
4 0

Answer:

Kinetic energy is highest at point B and Lowest at point A

Explanation:

The kinetic energy is directly proportional to the square of velocity. Therefore, the kinetic energy will be maximum at the point where the velocity is maximum. An it will be lowest at the position where the speed is the lowest. The speed is maximum at point B, because its the mean position. Hence, K.E will be max at B. Also speed is lowest at the highest point so, Kinetic Energy will be lowest at point A.

Another method can be used as follows:

Since, there are two energies present here, namely kinetic energy and potential energy that are interchanging with each other. From law of conservation of energy the sum of kinetic energy and potential energy must be equal at each point. Potential energy is directly proportional to height of object. So, the potential energy will be maximum at point A due to maximum height and consequently Kinetic energy will be minimum at point A. Similarly, the potential energy will be minimum at point B due to minimum height and consequently Kinetic energy will be maximum at point B. Therefore,

<u>Kinetic energy is highest at point B and Lowest at point A</u>

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Write the Ka expression for an aqueous solution of hydrofluoric acid: (Note that either the numerator or denominator may contain
damaskus [11]

Answer:

Ka = ( [H₃O⁺] . [F⁻] ) / [HF]

Explanation:

HF is a weak acid which in water, keeps this equilibrium

HF (aq)  +  H₂O (l)  ⇄  H₃O⁺ (aq)  +  F⁻ (aq)      Ka

2H₂O (l)  ⇄  H₃O⁺ (l)  +  OH⁻ (aq)   Kw

HF is the weak acid

F⁻ is the conjugate stron base

Let's make the expression for K

K = ( [H₃O⁺] . [F⁻] ) / [HF] . [H₂O]

K . [H₂O] = ( [H₃O⁺] . [F⁻] ) / [HF]

K . [H₂O] = Ka

Ka, the acid dissociation constant, includes Kwater.

4 0
2 years ago
He particles are mostly free of each other influence is solid , liquid , gas
Simora [160]

the most free particles are gases, then liquids, solids

4 0
3 years ago
If the forces are balanced...
iren [92.7K]

Answer:

the net force us 0.............

Explanation:

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4 0
3 years ago
1. Circle the letter of each sentence that is true about water's structure. a. Water is made up of atoms bonded to form molecule
sukhopar [10]

Water is made up of atoms bonded to form molecules, the chemical formula for water is H20, and 1 side has a positive charge, while the other has a negative one.

<h3>What is water?</h3>

Water is a fundamental molecule for life on the Earth due to its physico-chemical properties.

The water formula is H2O, which means that this molecule is composed of two atoms of Hydrogen and one atom of Oxygen.

In conclusion, Water is made up of atoms bonded to form molecules, the chemical formula for water is H20, and 1 side has a positive charge, while the other has a negative one.

Learn more on water properties here:

brainly.com/question/18681949

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-60 points-
Firdavs [7]

Answer:

1.23e+27

Explanation:

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