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Georgia [21]
3 years ago
15

A neutral atom as the same number of protons and electrons.

Physics
1 answer:
ZanzabumX [31]3 years ago
6 0

That is correct. Or so I believe. Either more or less than the other on the amount of protons and electrons, you can get either an unstable or a stable atom of an element.

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A hydraulic press has one piston of diameter 4.0 cm and the other piston of diameter 8.0 cm. What force must be applied to the s
yan [13]

Answer:

The  force is F_1  = 400.8 \  N

Explanation:

From the question we are told that

   The first  diameter is  d_1 =  4.0 \ cm =  0.04 \ m

   The second diameter is  d_2  =  8.0 \ cm  = 0.08 \  m

   

Generally the first area is  

         A_1  =  \pi  * \frac{d^2_1 }{4}

=>      A_1  = 3.142  * \frac{0.04^2}{4}

=>       A_1  =  0.00126 \ m^2

The  second area is  

     A_2 =  \pi  * \frac{d^2_2 }{4}

     A_2  = 3.142  * \frac{0.08^2}{4}

     A_2  =  0.00503 \ m^2

For a hydraulic press the pressure at both end must be equal .

Generally  pressure is mathematically represented as

    P =  \frac{F}{A}

=>  

   \frac{F_1}{A_1 }  =  \frac{F_2}{A_2 }

=>   F_1  =  \frac{1600}{0.00503}  *  0.00126

=>    F_1  = 400.8 \  N

8 0
3 years ago
An 80.0 kg skier slides down a hill shaped as shown. Assume
umka21 [38]

The height above the ground from where the skier start is 11.5 m.

<h3>Conservation of energy</h3>

The height above the ground from where the skier start is determined by applying the principle of conservation of energy as shown below;

P.E = K.E

mgh = ¹/₂mv²

gh = ¹/₂v²

h = \frac{v^2}{2g} \\\\h = \frac{15^2}{2 \times 9.8} \\\\h = 11.5 \ m

Thus, the height above the ground from where the skier start is 11.5 m.

Learn more about conservation of energy here: brainly.com/question/166559

8 0
3 years ago
Mechanical advantage of a first class Lever can be one or greater than one or less than one why​
erastovalidia [21]

Explanation:

Because they change the direction of force and multiply the effort.

They increase the rate of doing work.

So, MA of first class lever can be one or greater than one or less than one

8 0
3 years ago
Read 2 more answers
During take-off a 8kg model rocket is burning fuel causing its speed to increase
77julia77 [94]

The strength of the thrust is 122 newtons.

The motion of the rocket is described by the second Newton's law, whose model is shown below:

\Sigma F = F - D = m\cdot a (1)

Where:

  • F - Thrust, in newtons
  • D - Drag, in newtons
  • m - Mass of the rocket, in kilograms
  • a - Net acceleration of the rocket, in meters per square second

If we know that D = 90\,N, m = 8\,kg and a = 4\,\frac{m}{s^{2}}, then the strength of the thrust is:

F = D + m\cdot a

F = 90\,N + (8\,kg)\cdot \left(4\,\frac{m}{s^{2}} \right)

F = 122\,N

The strength of the thrust is 122 newtons.

To learn more on Newton's laws, we kindly invite to check this verified question: brainly.com/question/13678295

4 0
3 years ago
according to the law of conservation of energy what ultimatly happens to the total amount of energy in the universe?
fiasKO [112]
<span>In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another. For instance, chemical energy can be converted to kinetic energy in the explosion of a stick of dynamite.</span>
8 0
3 years ago
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