3 years ago

Please help! you are amazing! brainliest!

Physics

2 answers:

ELEN [110]3 years ago

8 0

I think it’s a nebula i hope it’s right

Daniel [21]3 years ago

6 0

I think the answer is A. As a nebula

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Derive an expression for the gravitational potential energy U(r) of the object-earth system as a function of the object's distan

Drupady [299]

Answer:

$U(r)=-\frac{Gm_Emr^2}{2R^3_E}$

Explanation:

We are given that

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We know that

Gravitational potential energy= $-\int F_gdr$

$U(r)=-\int\frac{Gm_Emr}{R^3_E}dr$

$U(r)=-\frac{Gm_Em}{R^3_E}\times \frac{r^2}{2}+C$

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$0=0+C$

$C=0$

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3 years ago

Sometimes balance point may not be obtained on the potentiometer wire why

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Solution
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2 years ago

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When looking at the chemical symbol, the charge of the ion is displayed as the

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Answer:

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Explanation:

When looking at the chemical symbol, the charge of the ion is displayed as the Superscript. This is because the charge of ions is usually written up on the chemical symbol while the atom/molecule is usually written down the chemical symbol. The superscript refers to what is written up on the formula while the subscript is written down on the formula.

An example is H2O . The 2 present represents two molecule of oxygen and its written as the subscript while Fe2+ in which the 2+ is written up is known as the superscript.

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