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3 years ago

6

To test the hypothesis above, you will observe the changes during the experiment. To do this, you will use these observations to

compare the of the substances to the of the substances.

2 answers:

julsineya [31]3 years ago

8 0

^^ correct

Answer:

For the second part, select all of them

Explanation:

100%

wariber [46]3 years ago

4 0

The answer to this is initial appearance and the second is final appearance.

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How much water is stored in groundwater lakes rivers soil and streams

Ne4ueva [31]

Answer:

Explanation:

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3 years ago

All compounds are positively charged true or false

marshall27 [118]

Answer:

false

Explanation: all compounds are electrically neutral.

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3 years ago

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A hot air balloon is traveling vertically upward at a constant speed of 4.5 m/s. When it is 28 m above the ground, a package is

ella [17]

Answer:

1.97 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0$

Solving the above equation we get

$t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89$

So, the time the package was in the air is 1.97 seconds

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4 years ago

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