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Mekhanik [1.2K]
3 years ago
14

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

Physics
1 answer:
Ludmilka [50]3 years ago
4 0
79 2/3 kilometers per hour
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3 years ago
A steel cable has a cross-sectional area 2.54 10-3 m2 and is kept under a tension of 1.01 104 N. The density of steel is 7860 kg
ElenaW [278]

Answer:

The speed is equals to 22.49 m/s

Explanation:

Given Data:

Area = A=2.54*10^-^3m^2\\Force = F = 1.01*10^4N\\density = p = 7860 kg/m^3

Required:

Speed of Traverse wave = c =?

Solution:

As we know that

p=m/V\\\\ p=m/(L*A)\\p*A=m/L

Now the equation for speed of traverse wave is calculated through:

\sqrt \frac{F*L}{m}\\

=\sqrt\frac{F}{m/L} \\\sqrt{} \frac{F}{p*A}

Substituting the values

\sqrt\frac{1.01*10^4}{7860*2.54*10^-^3}  \\

=22.49 m/s

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3 years ago
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Answer:

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Explanation:

i hope this answer your question if it s wrong please let know

7 0
2 years ago
Read 2 more answers
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