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Bezzdna [24]
3 years ago
12

A 10.0-kg animal is running at a rate of 3.0 m/s. What is the kinetic energy of the animal?

Physics
1 answer:
Ilya [14]3 years ago
4 0
Kinetic energy is calculated by using formula:

Ek = 1/2*m*v^2

Now we replace values of mass and speed in this formula.

Ek = 1/2*10*3^2 = 45.0J

When you have a formula and all variable values are given in the text of question just replace variable values in equation and find the final value.
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2 years ago
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Describe the movement of particles at the melting point of a substance with temperature and energy.
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As a substance reaches the melting point, the particles begin to move faster, causing the substance to become a liquid.

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7 0
2 years ago
The terminal velocity is not dependent on which one of the following properties? the drag coefficient 1 the force of gravity 2 c
ahrayia [7]
<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)

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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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4 0
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