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tensa zangetsu [6.8K]
3 years ago
14

A substance that is made up of only one kind of atom is an?

Physics
2 answers:
NeX [460]3 years ago
8 0

It is an element


that his the answer :)

devlian [24]3 years ago
7 0
Element, elements are the building blocks of our universe and are only composed of themselves<span />
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If the density of pure copper is 8.89g/cm3(at 20•c),calculate the volume of a copper brick with a mass of 4.5kg
oksano4ka [1.4K]

The volume of a substance can directly be calculated by the ratio of mass and density. That is:

volume = mass / density

 

Since the mass is 4.5 kg or 4500 grams, therefore:

volume = 4500 g / (8.89 g / cm^3)

<span>volume = 506.19 cm^3</span>

8 0
3 years ago
Explain why energy from the sun cannot reach us by conduction or convection?
34kurt

Answer:

It cannot reach us by conduction or convection as there is no medium such as air in most part of the space between the earth and the sun. From the sun the heat comes to us by another process known as radiation. The transfer of heat by radiation does not require any medium.

8 0
3 years ago
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For the electric power transmission system shown in the figure above, what is the ratio ns/np for the step-up transformer? assum
Ann [662]
I am attaching the missing figure

If we assume 100% efficiency, this means that the input power of the transformer must be equal to the output power

We divide output/input

240,000/12,000 = 20

This means that the transformer has a turns ratio of 1:20

<span>ns/np = 20/1 = 20

The voltage is amplified 20 times by the transformer, but this also means that the current decreases by a factor of 20, so the total power remains the same.</span>

7 0
3 years ago
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 41.5-gram mass is attached at the 28.5-cm
zzz [600]

Answer:

The value is  M  =  42.3 \  kg

Explanation:

From the question we are told that

    The first  position of the fulcrum  is  x = 49.7 cm

    The mass  attached is m  =  41.5 \  g

    The position of the attachment is  x_1 =  28.5 \  cm  

    The second position of the fulcrum is  x_2 = 39.2 \  cm

Generally the sum of clockwise torque =  sum of anti - clockwise torque

So  

       CWT  =  m (x_2 - x_1)

Here CWT  stands for clockwise torque

       ACWT  =  M  ( x - x_2)

So

      m (x_2 - x_1) =    M  ( x - x_2)

=>   41.5  (39.2 -  28.5 ) =    M  ( 49.7  -39.2 )

=>    M  =  42.3 \  kg

3 0
3 years ago
What is the main purpose of the organ system shown above?
jeka94
C provides support for the body
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3 years ago
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