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mart [117]
2 years ago
7

Define the unit of time and unit of length​

Physics
2 answers:
garik1379 [7]2 years ago
7 0
This is your perfect answer

The base unit for time is the second (the other SI units are: metre for length, kilogram for mass, ampere for electric current, kelvin for temperature, candela for luminous intensity, and mole for the amount of substance). The second can be abbreviated as s or sec.
djyliett [7]2 years ago
6 0

Answer:

hope you like

Explanation:

A unit of time is any particular time interval, used as a standard way of measuring or expressing duration.Its SI unit is second

A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. Its SI unit is meter

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Answer:

B. 500 years

Explanation:

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In this problem:

v=3.00\cdot 10^8 m/s is the speed at which light travels

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Therefore, by rearranging the equation, we can find the time:

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And by converting into years, this time is

t=\frac{1.6\cdot 10^{10}}{(365)(24)(60)(60)}=507 y

So, approximately 500 years: this means that the image we see of the star is 500 years old.

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