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trapecia [35]
3 years ago
15

How long does it take a lightbulb to use 1kj of energy?

Physics
1 answer:
Mekhanik [1.2K]3 years ago
3 0

Answer:

<em>13.3 seconds</em>

Explanation:

The complete question is...

How long does it take a 75 W lightbulb to use 1 kJ of energy?

The Energy of the bulb E = 1 KJ = 1000 J

The power rating of the lightbulb = 75 W

The power rating of a bulb P = Energy used per unit time = E/t

substituting, we have

75 = 1000/t

t = 1000/75 = <em>13.3 seconds</em>

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A lens having short focal length will produce Less Magnification and Wide Angle of view.

Short focal length gives a deeper depth of the present field in addition to the wide angle of view. They capture maximally that lies in their front of the camera to the infinity.

A lens with large focal length captures a narrow field band as compared to the one with short focal length.

The lower focal length shows the short depth of focus leading to less magnification.

Short focal length is determined by the radius of curvature of both the curvature of the lens, the medium of the surrounding and the refractive index of the lens given.

Focal length of camera shows how much band the camera is able to capture.

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2 years ago
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babunello [35]

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i think its 1.5 m/s to the right?

Explanation:

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