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r-ruslan [8.4K]
2 years ago
5

if a girl holds a ball at waist level and then lifts the ball above her head and holds it there which of the following is she do

ing
Chemistry
2 answers:
Zigmanuir [339]2 years ago
4 0

Answer:

She is making kinetic energy when she lifts the ball and when the ball is above her head the ball gains potential energy.

Art [367]2 years ago
3 0

Answer:

Increasing the ball's stored energy

Explanation:

When the girl moves the ball from the height of her waist to above her head, she is making the ball move, which is increasing the ball's kinetic energy.

The movement of a car, a person or any object has energy, this energy related to movement is called kinetic energy. A moving body, having kinetic energy, can do work when it comes in contact with another body or object and transfer energy to it. However, an object at rest can also have energy, which makes it insufficient to relate the concept of energy to movement.

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A certain chemical reaction releases 36.2 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of re
Lilit [14]

Answer:

0.038 g of reactant

Explanation:

Data given:

Heat release for each gram of reactant consumption = 36.2 kJ/g

mass of reactant that release 1360 J of heat = ?

Solution:

As  36.2 kJ of heat release per gram of reactant consumption so first we will convert KJ to J

As we know

1 KJ = 1000 J

So

36.2 kJ = 36.2 x 1000 = 36200 J

So it means that in chemical reaction 36200 J of heat release for each gram of reactant consumed so how much mass of reactant will be consumed if 1360 J heat will release

Apply unity formula

                 36200 J of heat release ≅ 1 gram of reactant

                 1360 J of heat release ≅ X gram of reactant

Do cross multiplication

              X gram of reactant = 1 g x 1360 J / 36200 J

              X gram of reactant = 0.038 g

So 0.038 g of reactant will produce 1360 J of heat.

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Explanation:

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