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STatiana [176]
2 years ago
6

A mechanical wave is created when a source of energy causes _____.

Physics
1 answer:
earnstyle [38]2 years ago
3 0

\huge \tt \: { \blue{ \fbox{ \purple{\underbrace{ \pink{\overbrace{\green{Answer}}}}}}}}

A mechanical wave is created when a source of energy causes \sf \bf   {\underline{a  \:  \: vibration  \:  \: to \:  \:  travel \:  \:  through  \:  \: a  \:  \: medium }}

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A boy is whirling a stone around his head by means of a string. The string makes one complete revolution every second; and the m
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Answer

given,                                                

Tension of string is F                                                  

velocity is increased and the radius is not changed.      

the string makes two complete revolutions every second

consider the centrifugal force acting on the stone          

  = \dfrac{mv^2}{r}                          

now centrifugal force is balanced by tension

T =\dfrac{mv^2}{r}                                

From the above expression we can clearly see that tension is directly proportional to velocity and inversely proportional to radius.

When radius is not changing velocity is increasing means tension will also increase in the string.

8 0
3 years ago
How much physical activity do adults need
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5 0
3 years ago
Which observation would be evidence that heat was transferred by radiation?
oksian1 [2.3K]
I think the answer is D
8 0
2 years ago
During an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a black residue. The total ma
zloy xaker [14]

Answer:

See below explanation

Explanation:

The correspondent chemical reaction for copper carbonate decomposed by heat is:

CuCO₃ (s) → CuO (s) + CO₂ (g)

Considering all molar mass (MM) for each element ( we consider rounded numbers) :

MM CuCO₃ = 123 g/mol

MM CuO = 79 g/mol

MM CO₂ = 44 g/mol

Statement mentions that scientis heated 123.6 g of CuCO₃ (almost a MM), until a black residue is obtained, which weights 79.6 g : this solid residue is formed by CuO, and the remaining mass (approximatelly 44 g) belongs to teh second product, this is, CO₂; as it is a gas compund, it is not certainly included on the solid residue.

So, law of conservation mass is true for this case, since: 123.6 g = 79.6 g + 44 g. As explained, on the solid residue, we don not include the 44 g, which  "escaped" from our system, since it is a gas compound (CO₂)

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3 years ago
Calculate the force exerted on this test dummy with a mass of 75 kg hits an air bag accelerating at 12 m/s2.
maksim [4K]

Answer: 900

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3 years ago
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