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den301095 [7]
3 years ago
14

Two metal spheres are suspended from strings. The

Physics
1 answer:
IRINA_888 [86]3 years ago
6 0

Answer:

The answer to your question is the letter B. A repulsive force of 8.0 x 10³N

Explanation:

Data

Charge 1 = -2.0 x 10² C

Charge 2 = -4.0 x 10⁻⁸ C

K (Coulomb constant) = 9 x 10⁹ Nm²/C²

distance = 3 m

Formula

F = K (q₁ x q₂) / r²

Substitution

F = 9 x 10⁹ (-2.0 x 10²)(-4.0 x 10⁻⁸) / 3²

Simplification

F = 9 x 10⁹ (0.000008) / 9

F = 72000 / 9

Result

F = 8000 C = 8 x 10³ N

Conclusion

As both spheres are negative the force is negative with magnitude 8x 10³N

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igomit [66]

Answer:

An object has the MOST kinetic energy when it's movement is the GREATEST.

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3 years ago
A stone is dropped from a cliff and falls 9.44 meters. What is the speed of the stone when it reaches the ground?
Lunna [17]

Answer:

option A

Explanation:

given,                                              

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speed of the stone = ?                          

As the stone is dropped the energy of the stone will be conserved.

using conservation of energy.            

Potential energy = Kinetic energy    

m g h = \dfrac{1}{2} m v^2  

     v = \sqrt{2gh}                  

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     v = \sqrt{185.024}              

            v = 13.60 m/s                      

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3 0
3 years ago
An open train car moves with speed 18.5 m/s on a flat frictionless railroad track, with no engine pulling the car. It begins to
olga2289 [7]

Answer:

The speed decreases.

Explanation:

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where m_{1} is the initial mass of the train, and v_{1} the initial speed of the train.

And linear momentum after the water filled the train car is

m_{2}v_{2}

where m_{2} is mass of the train after the  rain, and v_{2} the speed of the train after the rain

<u>the equality must be fulfilled:</u>

m_{1}v_{1}=m_{2}v_{2}

We know that if water is added to the train, m_{2} that is the mass after the water is added, is greater than m_{1} which is the mass of the train without the water.

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the speed after the water is added (v_{2} ) must be smaller than the initial train speed (v_{1} ) . So the speed of the car decreases.

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3 years ago
Regions in the milky way where density waves have caused gas clouds to crash into each other are called
Mandarinka [93]
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3 years ago
How much work is done when a 214 newton force pushes a sleeping cow 37m across a field.
nata0808 [166]
Hello!

Answer: 
7918 J

Explanation:

We are assuming that the floor (field) is completely horizontal since there's no information about that in the statement. 

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8 0
3 years ago
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