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Physics

1 answer:

lorasvet [3.4K]3 years ago

5 0

Explanation:

They are;

The vertical columns of periodic table is called group and the horizontal rows of periodic table is called periods.
The valance electron of all elements in the same group are the same but in periods the valance electron of elements in the same period increases from left to righr.
The size of atoms increases top to bottom. but in case of periods the size of atoms decreases from left to right.
Metalic reactivity increases and non metalic reactivity decreases from top to bottom. but in periods metalic reactivity decreases and non metalic reactivity increases from left to right.

hope it helps...

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Answer:

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Answer:

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2 years ago

A 75-m-long train begins uniform acceleration from rest. the the train has a speed of 23 m/s when it passes a railway worker tan

Lapatulllka [165]

Answer:

acceleration a = 1.04 m/s2

Explanation:

Assume the train has a speed of 23m/s when the last car passes the railway workers. Once this happens the last car would have traveled a total distance of the 180m distance between the railway worker standing 180 m from where the front of the train started plus the 75m distance from the first car to the last car:

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