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3 years ago

Which substance has a melting point greater than room temperature?

Physics

1 answer:

blagie [28]3 years ago

4 0

Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

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What best describes the relationship between wavelength and frequency in an electromagnetic wave?

netineya [11]

Inversely proportional
I hope this helps you!

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4 years ago

Read 2 more answers

A wire carries a current of 4.1 A. How many electrons per second are passing any cross sectional area of the wire? Enter your an

aivan3 [116]

To solve this problem it is necessary to apply the concepts related to Current and Load.

The current in terms of the charge of an electron can be expressed as

$i = \frac{q}{t}$

Where,

q = Charge

t = time

At the same time the Charge is the amount of electrons multiplied by the amount of these, that is

q = ne

Replacing in the first equation we have to

$i = \frac{q}{t}$

$i = \frac{ne}{t}$

Clearing n,

$n = \frac{it}{e}$

Here the time is one second then

$n = \frac{i}{e}$

$n = \frac{4.1}{1.6*10^{-9}}$

$n = 2.56*10^{19}electrons$

Therefore the number of electrons per second are passing any cross sectional area of the wire are $2.56*10^{19}electrons$

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3 years ago

What are 7 elements from the periodic table that are named after objects in outer space

suter [353]

Helium... from the greek word helios... the sun
selenium... from the greek word selene... the moon 
palladium.. after the asteroid pallas 
tellurium...from the greek word tellus... the earth 
mercury...after the planet mercury 
cerium... after the asteroid ceres 
uranium...after the planet uranus 
neptunium.. after the planet neptune 
plutonium.. after the planet pluto

5 0

3 years ago

Half of the moon is always illuminated by the sun. Given that this is true, then what causes the moon to change phases throughou

ollegr [7]

It is true that only half of the moon is always illuminated by the sun. The reason why the moon changes it phases is because Moon orbits around the Earth, and due to this some areas of the half of the moon will not be lit by the sun.

8 0

3 years ago

What is the net force required to accelerate a 16 kg box at a rate or 1.4 m/s^2

stich3 [128]

You can use Newton's Second Law which states:
$\sum \vec{F} = m\vec{a}$

Plug in given information:
$\sum \vec{F}=16(1.4) = 22.4N$

This is closest to option b which is your answer.

8 0

3 years ago