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Lynna [10]
4 years ago
10

Example of items that changed chemically

Physics
1 answer:
Ostrovityanka [42]4 years ago
3 0
Burning of gases is one the example of chemical change
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A 121-cm-long, 4.00 g string oscillates in its m = 3 mode with a frequency of 180 Hz and a maximum amplitude of 5.00 mm. What ar
Alex777 [14]

Answer:

0.8067 m

69.696 N

Explanation:

m = Mode = 3

M = Mass of string = 4 g

f = Frequency = 180 Hz

l = Length of string = 121 cm

Length of the string is given by

l=m\dfrac{\lambda}{2}\\\Rightarrow \lambda=2\dfrac{l}{m}\\\Rightarrow \lambda=2\times \dfrac{1.21}{3}\\\Rightarrow \lambda=0.8067\ m

The wavelength is 0.8067 m

Linear density is given by

\mu=\dfrac{M}{l}\\\Rightarrow \mu=\dfrac{4\times 10^{-3}}{1.21}

Speed of the wave

v=f\lambda\\\Rightarrow v=180\times 2\times \dfrac{1.21}{3}\\\Rightarrow v=145.2\ m/s

Speed of wave is given by

v=\sqrt{\dfrac{T}{\mu}}\\\Rightarrow T=\mu v^2\\\Rightarrow T=\dfrac{4\times 10^{-3}}{1.21}\times 145.2^2\\\Rightarrow T=69.696\ N

Tension is given by 69.696 N

8 0
3 years ago
Two forces of magnitudes 5 N and 8 N act on a body. What are the maximum and minimum resultant forces that can act on the body?​
Ivan

Answer:

Max. = 13 N

Mjn. = 3 N

Explanation:

Max. resultant will be when these forces are being applied in the same direction(along the same line), we'll simply sum up the forces to get the resultant in this case.

= 5 + 8

= 13 N

Min. resultant will be when these forces are being applied in opposite directions (the forces must be present along the same line).

We'll subtract them to get the resultant now

= 8 - 5

= 3 N

3 0
3 years ago
If the coefficient of kinetic friction is 0.43 for a box sliding across your lab table and the
ValentinkaMS [17]

Answer:

3.2N

Explanation:

Given parameters:

Coefficient of kinetic friction  = 0.43

Weight of box  = 7.4N

Unknown:

Force of kinetic friction  = ?

Solution:

The force of kinetic friction is given as:

        Force of kinetic friction  = UN

U is the coefficient of friction

N is the weight

  Force of kinetic friction  = 0.43 x 7.4  = 3.2N

3 0
3 years ago
How is coal formed? from hydrothermal deposits from igneous intrusions from 300 to 400 million year old plant remains from oil d
Lady_Fox [76]
You can thank me if this answer helps. The energy coal comes from energy that was stored in giant plants that lived hundreds of millions of years ago in swamp forests,even before dinosaurs!
3 0
4 years ago
The same type of engine is placed in 2 different planes
bazaltina [42]

Answer:

you didnt finish the question but im guessing the answer is matters what each airplane is built out of even though they have the same engine they will perfrom diffrently depending on the material their made out of.

7 0
3 years ago
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