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ludmilkaskok [199]
3 years ago
14

A 100 Watt lightbulb has an average life of 2000 hours. How much energy does it consume over its lifetime? Give your answer in J

oules
Physics
1 answer:
kow [346]3 years ago
8 0
200,000 thousand hours . Hope this helps
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A crate falls from an airplane flying horizontally at an altitude of 2,000 m.
Hatshy [7]

Answer:

20.2 seconds

Explanation:

The airplane (and therefore the crate) initially has no vertical velocity, so v₀ = 0 m/s.

The crate is in free fall, so a = -9.8 m/s².

The crate falls downward, so Δx = -2000 m.

Find: t, the time it takes for the crate to land.

Δx = v₀ t + ½ at²

-2000 m = (0 m/s) t + ½ (-9.8 m/s²) t²

t = 20.2 s

It takes 20.2 seconds for the crate to land.

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What happens to a sheet of copper as kinetic energy of copper molecules decrease
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An automobile is traveling on a long, straight highway at a steady 80.0 mi/h when the driver sees a wreck 190 m ahead. At that i
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a) The car’s speed just after leaving the icy portion of the road is the first part

Explanation:

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When light travels from air to water at an angle which of the following happens? a) The light slows down and it changes directio
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Answer:

b) The light slows down and it changes direction towards the perpendicular.

Explanation:

Light travels at different speed in different mediums.

Refractive index is equal to velocity of the light 'c' in empty space divided by the velocity 'v' in the substance.

Or ,

n = c/v.

Light travels at a slower speed in water as compared to air because there are more number of interfering molecules in the path of the light in case of water as compared to liquid.

<u>When a light travels from lower denser medium say water to higher denser medium say water, it bends towards the perpendicular as its speed reduces in that medium.</u>

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