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Alekssandra [29.7K]
2 years ago
8

What will it be ? Plz help me

Physics
1 answer:
IgorC [24]2 years ago
3 0

Answer:

For number 2, it will be 8.

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The common velocity v after collision is 2.8m/s²

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What happens when the voltage increases and the resistance stays the same in a electrical circuit?
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The current in the circuit increases

Explanation:

The ohm's law states that the potential across a circuit is proportional to the current in the circuit.

                                             V ∝ I

Where 'V' is the potential difference across the circuit and 'I' is the current in the circuit.

The proportionality constant present in the equation is the resistance of the circuit. Hence, the equation becomes

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An atom that has an excess positive or negative electrical charge caused by the loss or addition of an electron is called a(n)
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What is the magnitude of the average velocity of the hummingbird between 2 sec and t 4 sec <br>​
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A force of 40 N is required to hold a spring that has been stretched from its natural length of 10 cm to a length of 15 cm. How
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0.36 J of work is done in stretching the spring from 15 cm to 18 cm.

To find the correct answer, we need to know about the work done to strech a string.

<h3>What is the work required to strech a string?</h3>
  • Mathematically, the work done to strech a string is given as 1/2 ×K×x².
  • K is the spring constant.
<h3>What will be the spring constant, if 40N force is required to hold a 10 cm to 15 cm streched spring?</h3>
  • The force experienced by a streched spring is given as Kx. x is the length of the spring streched from its natural length.
  • Then K = Force / x.
  • Here x = 15 - 10 = 5 cm = 0.05 m
  • K = 40/0.05 = 800N/m.
<h3>What will be the work required to strech that spring from 15 cm to 18 cm?</h3>
  • Work done = 1/2×k×x²
  • Here x= 18-15=3cm or 0.03 m
  • So, W= 1/2×800×0.03² = 0.36 J.

Thus, we can conclude that the work done is 0.36 J.

Learn more about the spring force here:

brainly.com/question/14970750

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