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Sphinxa [80]
3 years ago
9

What is an exothermic chemical reaction? A. It is a reaction that converts matter to heat. B. It is a reaction that requires hea

t to proceed. C. It is a reaction that draws heat from its surroundings. D. It is a reaction that releases heat to its surroundings.
Physics
2 answers:
alukav5142 [94]3 years ago
4 0

Answer: The answer is

D. It is a reaction that releases heat to its surroundings.

Explanation:

An exothermic reaction is a reaction in which the overall standard enthalpy change to negative. And  Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

nordsb [41]3 years ago
3 0

it is D exo means realease

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nexus9112 [7]

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load

a generator, a light bulb (load) and a closed switch

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4 0
2 years ago
A hot air balloon is traveling vertically upward at a constant speed of 4.5 m/s. When it is 28 m above the ground, a package is
ella [17]

Answer:

1.97 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0

Solving the above equation we get

t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89

So, the time the package was in the air is 1.97 seconds

3 0
3 years ago
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