3 years ago

How do you use the periodic table to recall the ionic charge of an alkali metal, an alkaline earth metal, or aluminum?

Physics

1 answer:

valkas [14]3 years ago

4 0

Answer:

the positive charge is the period number

Explanation:

I might be wrong

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Two objects charged with an equal amount of charge interact with each other with a force

pav-90 [236]

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6 0

3 years ago

17 copper wires of length l and diameter d are connected in parallel to form a single composite conductor of resistance R. What

Lubov Fominskaja [6]

Answer:

$\frac{D}{d} = 4.12$

Explanation:

As we know that resistance of one copper wire is given as

$r = \rho \frac{L}{a}$

here we know that

$a = \pi (\frac{d}{2})^2$

now we have

$r = \rho \frac{L}{\pi (\frac{d^2}{4})}$

$r = \rho \frac{4L}{\pi d^2}$

now we know that such 17 resistors are connected in parallel so we have

$R = \frac{r}{17}$

$R = \rho \frac{4L}{17 \pi d^2}$

Now if a single copper wire has same resistance then its diameter is D and it is given as

$R = \rho \frac{4L}{\pi D^2}$

now from above two equations we have

$\rho \frac{4L}{\pi D^2} = \rho \frac{4L}{17 \pi d^2}$

$D^2 = 17 d^2$

now we have

$\frac{D}{d} = 4.12$

3 0

3 years ago

A book with a mass of 2 kg sits on top of a book shelf at a height of 3 m. How much potential energy does the book have

Arada [10]

Answer:

Answer is 98 joules

Explanation:

P. E=2*9.8*3=98

S.i unit of potential energy ⚡ is joules

So answer is 98 joules

5 0

3 years ago

What happens to an electromagnetic wave when the frequency is doubled?

Artist 52 [7]

The product of (frequency) times (wavelength) is always
the same number (the speed of the wave).

So if the frequency is doubled, the wavelength has to drop to
half of what it was, in order to keep their product constant.

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4 years ago

How much time does it take for a car traveling 19.1 m/s to cover a distance of 1200 m?

nalin [4]

Answer:

Explanation:

it would take around 63 if ur asking for 1200/19.1

4 0

3 years ago