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Kruka [31]
3 years ago
9

An electron is accelerated through a potential difference of 0.20 v. How much greater would its final speed be if it is accelera

ted with four times as much voltage?
Physics
1 answer:
Gnom [1K]3 years ago
3 0

Answer:

v₂ = 2* v₁

Explanation:

  • Assuming no friction present, the change in the electrostatic potential energy of the electron, must be equal in magnitude to the change in the kinetic energy:

       \Delta U_{ep} = (-e)*\Delta V= - \Delta K = -\frac{1}{2}*m*v^{2}

  • We know that ΔV = 0.2 V, so we can write the following equality:

        e* 0.2V = \frac{1}{2} * m *v_{1} ^{2} (1)

  • Now, if the voltage increases 4 times, we can write the following equality:

       e* 0.8V = \frac{1}{2} * m *v_{2} ^{2} (2)

  • Dividing both sides in (1) and (2), and simplifying common terms, we get:

        \frac{v_{2} ^{2}}{v_{1} ^{2}} = 4\\\\  v_{2} ^{2} = 4*v_{1} ^{2}

  • Taking square roots at both sides, we get:
  • v₂ = 2* v₁
  • The final speed, if the electron is accelerated through a potential difference four times larger, will be double than the one for a potential difference of 0.2 V.
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The work done on the filled bucket in raising out of the hole is 2, 925 Joules

<h3>How to determine the work done</h3>

Using the formula:

Work done = force * distance

Note that force = mass * acceleration

F = mg + ma

F = 4. 5 * 10 + 28 * 10

F = 45 + 280

F = 325 Newton

Distance = 9m

Substitute into formula

Work done = 325 * 9

Work done = 2, 925 Joules

Therefore, the work done is 2, 925 Joules

Learn more about work done here:

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2 years ago
What are 4 physical properties for the bear
Pie

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A bear normally has a short, thick neck, a rounded head, a pointed muzzle, short ears, and small eyes. Some species have round faces. Bears have poor eyesight, and most have only fair hearing.

Explanation:

Modern Bears are characterized with large body and stocky legs, a long snout, shaggy hair, plantigrade paws with five non-retractile claws and a short tail.

Grizzly bears (Ursus arctos horribilis) have concave faces, a distinctive hump on their shoulders, and long claws about two to four inches long. Both the hump and the claws are traits associated with a grizzly bear's exceptional digging ability. Grizzlies are often dark brown, but can vary from blonde to nearly black.

The brown bear has a slight hump above its shoulder, round ears, a long snout and big paws with long, curved claws that it uses for digging. Unlike the black bear, it can't climb trees. It can weigh between 350-1,500 pounds. When standing on its hind legs it can be up to 5 feet tall.

Hope this helps     :)

(I didn't know which type of bear so i did brown bear and grizzly bear)

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Pablo and Charles were conducting an investigation where they were measuring the energy of a glass marble as it rolled down a ra
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Answer:

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Answer:

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Explanation:

f=0.27

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