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damaskus [11]
3 years ago
14

If energy is absorbed because chemical reaction is ______.

Physics
1 answer:
melomori [17]3 years ago
4 0
<h2>Answer:</h2>

The reaction is <u>D. endothermic</u>.

<h2>Explanation:</h2>

Absorption or need of energy from surroundings is called endothermic process. Heat is the major common form of energy which is absorbed in this process.  In this process, enthaply of reactant is less than the product.

For example, an ice cube placed in the hand for some time starts to melt and it takes energy in the form of heat from the hand. This process always requires energy because of the breaking of existing and formation of new chemical bonds.

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3 years ago
A new ride being built at an amusement park includes a vertical drop of 126.5 metered. Starting from rest, the ride vertically d
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Answer:

The amount of Potential Energy lost in the form of Thermal Energy is equal to 41.64 MJ.

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mass of the cart and passengers = m = 3.5*10⁴ kg

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v = 10 ms⁻¹

At the top position the Total energy of the ride is in the form of potential energy given as:

P.E = mgh

= 3.5*10⁴*9.8*126.5

= 43389500 J

At the bottom of the drop, all the Potential Energy will be converted into K.E as the ride develops speed given as:

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= 0.5*3.5 x 10⁴*100

= 1750000 J

The K.E is much less than the P.E energy even though all the P.E of the ride has been converted. The loss of energy is due to the formation of thermal energy which can be calculated as:

Thermal Energy lost = Total energy in the form of P.E(top) - Total energy in the form of K.E(bottom)

= 43389500 -  1750000

= 41639500 J

= 41.64 M J approx             M J = mega joule = 10⁶ J

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3 years ago
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