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Snowcat [4.5K]
3 years ago
7

Was the first chemist to organize elements by atomic number

Physics
2 answers:
Arturiano [62]3 years ago
5 0

Answer:

Dimitri Mendeleev

Explanation:

This man started the development of the periodic table, by arranging elements by atomic mass.  

spayn [35]3 years ago
3 0

Answer:

C: Dimitri Mendeleev

Explanation:

keep it movin

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Which is an example of a chemical change?
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Burning wax

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because in burning, wax reacts with oxygen present in the surrounding and forms carbon dioxide and ash

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Give in one word answer : <br>combination of cell in series​
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The combination of cells in which the negative terminal of a first cell is connected with the positive terminal of second cell and the negative terminal of a second cell is connected to the positive terminal of a third cell and so on is known as series combination of cells.

Explanation:

hope this helps to u

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How are sound waves similar to light waves?
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Answer:

Sound and light are similar in that both are forms of energy that travel in waves.

Explanation:

They both have properties of wavelength, freqency and amplitude. ... Sound can only travel through a medium (substance) while light can travel through empty space. Sound is a form of mechanical energy caused by vibrations of matter.

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Spitting cobras can defend themselves by squeezing muscles around their venom glands to squirt venom at an attacker. Suppose a s
Nezavi [6.7K]

Answer: 1.124 m

Explanation:

This situation is a good example of the projectile motion or parabolic motion, and the main equations that will be helpful in this situations are:  

x-component:  

x=V_{o}cos\theta t   (1)  

Where:  

V_{o}=2.80 m/s is the initial speed  

\theta=39\° is the angle at which the venom was shot

t is the time since the venom is shot until it hits the ground  

y-component:  

y=y_{o}+V_{o}sin\theta t+\frac{gt^{2}}{2}   (2)  

Where:  

y_{o}=0.4 m  is the initial height of the venom

y=0  is the final height of the venom (when it finally hits the ground)  

g=-9.8m/s^{2}  is the acceleration due gravity

Knowing this, let's begin:

First we have to find t from (2):

0=0.4 m+2.8 m/s sin(39\°) t+\frac{-9.8m/s^{2}t^{2}}{2}   (3)

Rearranging (3):  

-4.9 m/s^{2} t^{2} + 1.762 m/s t + 0.4 m=0   (4)  

This is a <u>quadratic equation</u> (also called equation of the second degree) of the form at^{2}+bt+c=0, which can be solved with the following formula:  

t=\frac{-b \pm \sqrt{b^{2}-4ac}}{2a} (5)  

Where:  

a=-4.9  

b=1.762  

c=0.4  

Substituting the known values:  

t=\frac{-1.762 \pm \sqrt{(1.762)^{2} - 4(-4.9)(0.4)}}{2(-4.9)} (6)  

Solving (6) we find the positive result is:  

t=0.517 s (7)

Substituting (7) in (1):

x=2.8 m/s cos(39\°) (0.517 s)   (8)

Finally:

x=1.124 m   (9)

4 0
4 years ago
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