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Rzqust [24]
3 years ago
12

A capacitor is charged to a potential difference of 3 volt it delivers 30% store energy to lamp what is the final potential diff

erence across the capacitor
Physics
1 answer:
nexus9112 [7]3 years ago
4 0

Answer:

3.98V

Explanation:

Given

Pontential difference V as 3v

Energy delivered is 30%,

Recall that Enery E=1/2cv^2 from this E=V^2(since Current C is not provided we can assume a value 2)

So E=V^2

E=3^2=9

At full charge E=9,30%of 9,0.3*9=2.7 energy in capacitor is 9-2.7=6.3

But E=V^2

✓E=V

✓6.3=3.98V

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The chart shows data for an object moving at a constant acceleration. Which values best complete the chart? Time (s) Velocity (m
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A.

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3 years ago
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A long ramp made of cast iron is sloped at a constant angle θ = 52.0∘ above the horizontal. Small blocks, each with mass 0.42 kg
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Answer:

For cast iron we have

h = 0.92 m

For copper

h = 1.05 m

For Lead

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For Zinc

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As we know that final speed of the block is calculated by work energy theorem

W_f + W_g = \frac{1}{2}mv^2

now we have

-\mu_k mg cos\theta(\frac{h}{sin\theta}) + mgh = \frac{1}{2}mv^2

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For cast iron we have

4 = \sqrt{2(9.81)(h)(1 - 0.15cot52)}

h = 0.92 m

For copper

4 = \sqrt{2(9.81)(h)(1 - 0.29cot52)}

h = 1.05 m

For Lead

4 = \sqrt{2(9.81)(h)(1 - 0.43cot52)}

h = 1.23 m

For Zinc

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3 years ago
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Velocity can best be described by which of the following statements?
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