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tatuchka [14]
3 years ago
9

How are problems best solved by scientists?

Physics
2 answers:
spin [16.1K]3 years ago
3 0
One scientist proposes an idea and other scientists repeat his or her experiments so they can Accept the Idea.
jekas [21]3 years ago
3 0
Usually Ask for Help or Solve it themselves by using Hypotheses .⇵
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The length of a certain wire is kept same while its radius is doubled. what is the new resistivity of this wire?
anastassius [24]
The text does not specify whether the resistance R of the wire must be kept the same or not: here I assume R must be kept the same.

The relationship between the resistance and the resistivity of a wire is
\rho =  \frac{AR}{L}
where
\rho is the resistivity
A is the cross-sectional area
R is the resistance
L is the wire length

the cross-sectional area is given by
A=\pi r^2
where r is the radius of the wire. Substituting in the previous equation ,we find
\rho =  \frac{\pi r^2 R}{L}

For the new wire, the length L is kept the same (L'=L) while the radius is doubled (r'=2r), so the new resistivity is
\rho' =  \frac{\pi r'^2 R}{L'}= \frac{\pi (2r)^2 R}{L}=4  \frac{\pi r^2 R}{L}   = 4 \rho
Therefore, the new resistivity must be 4 times the original one.
5 0
3 years ago
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The figure shows a 1 cm cube that has a mass of 1 gram. Calculate the density of the cube in kg/m³.
dolphi86 [110]
Density = 1 g/cm^3 = 1000 Kg/m^3
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3 years ago
A wave has a frequency of 655 he And is traveling at 455m/sec. what is the wavelength
Vlada [557]

Answer:

v=wavelength ×f

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How should scientists express very large numbers when reporting data ?
Ira Lisetskai [31]
To get the best possible answer. (sorry if im wrong)
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An instrument is defective for all of the following conditions EXCEPT:_______
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Answer:

I believe its C

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