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3 years ago

Which most likely indicates a chemical change has occurred?

Physics

2 answers:

Law Incorporation [45]3 years ago

4 0

green liquid becoming a red liquid

Orlov [11]3 years ago

4 0

Green to red
Others are state changes which are physical not chemical

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At the periphery of a hurricane the air is ____, and several kilometers above the surface, in the eye, the air is ____.

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4 years ago

A raindrop falls to the ground from a rain cloud at an altitude of 3000 meters.

shutvik [7]

Assuming the raindrop was stationary relative to the vertical distance to the ground at the start:

D=0.5at where d is distance, a is acceleration and t is time

D is 300 meters

a is 9.8 meter/sec squared

Solve for t in seconds

t = 61.2 seconds

v=at where v is velocity

a is 9.8 meters per second squared

t is 61.2 seconds

solve for v

v = 600 meters per second.

If it had an initial vertical velocity (v0) at the start :

d= 0.5at+v0t

and

v=at+v0

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3 years ago

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3 years ago

If the Universe started as a singularity, it would mean that _____ started out _____. all mass and energy, spread out across the

timurjin [86]

Answer: All mass and energy; in a point.

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4 years ago

Write the dimension of a / b in the x = at + bt2. Where x is the distance and t is the time?

Luba_88 [7]

The dimension of a/b where x is the distance and t is the time is T

Given the expression

x = at + bt²

where

x is the distance

t is the time

Based on the homogeneity principle, the expression on the left-hand side must be equal to that on the right. Hence;

x = at

$a = \frac{x}{t}$

Since x is the distance and distance is measured in metres, the dimension equivalent will be the length 'L'

Since t is the time and time is measured in seconds, the dimension equivalent will be the seconds 'T'

$a=\frac{L}{T}$

Similarly;

x = bt²

$b=\frac{x}{t^2}\\b=\frac{L}{T^2}$

Next is to get a/b;

$\frac{a}{b} = \frac{L}{T} \div \frac{L}{T^2}\\\frac{a}{b} = \frac{L}{T}*\frac{T^2}{L} \\\frac{a}{b} =\frac{T^2}{T}\\\frac{a}{b} =T$

Hence the dimension of a/b is T

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3 years ago