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iragen [17]
3 years ago
12

In which type of chemical reaction is heat absorbed from the surroundings?

Physics
2 answers:
True [87]3 years ago
7 0
Endothermic reaction
Sedaia [141]3 years ago
7 0

Answer:endothermic

Explanation:

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The terminal velocity is not dependent on which one of the following properties? the drag coefficient 1 the force of gravity 2 c
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<h2>Answer: the falling time</h2>

Explanation:

When a body or object falls, basically two forces act on it:  

1. The force of air friction, also called<em> </em><u><em>"drag force"</em></u> D:  

D={C}_{d}\frac{\rho V^{2} }{2}A  (1)

Where:  

C_ {d} is the drag coefficient  

\rho is the density  of the fluid (air for example)

V is the velocity  

A is the transversal area of the object

So, this force is proportional to the transversal area of ​​the falling element and to the square of the velocity.  

2. Its <u>weight </u>due to the gravity force W:  

W=m.g

(2)

Where:  

m is the mass of the object

g is the acceleration due gravity  

So, at the moment <u>when the drag force equals the gravity force, the object will have its terminal velocity:</u>

D=W (3)

{C}_{d}\frac{\rho V^{2} }{2}A=m.g  (4)

V=\sqrt{\frac{2m.g}{\rho A{C}_{d}}}  (5) This is the terminal velocity

As we can see, there is no "falling time" in this equation.

Therefore, the terminal velocity is not dependent on the falling time.

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The demand equation for the Roland portable hairdryer is given as follows where x (measured in units of a hundred) is the quanti
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