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3 years ago

Which of the following is WRONG?

Physics

2 answers:

Sav [38]3 years ago

4 0

Answer:

Explanation:

•The unit of time is Second (sec) it is correct

•The time period of a given pendulum is constant because it depends on the length of the pendulum.

•And two cities are measured in kilometers

So None Of the Above!

iren2701 [21]3 years ago

3 0

It’s D the time period within pendulums are constant, distance is always measured with kilometers within cities and basic unit is always seconds.

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3 years ago

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Triss [41]

Answer:

2.1406 × $10^6$ m/sec

Explanation:

we know that energy is always conserved

so from the law of energy conservation

$qV=\frac{1}{2}mv^2$

here V is the potential difference

we know that mass of proton = 1.67× $10^{-27}$ kg

we have given speed =50000m/sec

so potential difference $V=\frac{\frac{1}{2}\times 1.67\times 10^{-27}50000^2}{1.6\times 10^{-19}}=13.045$

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so for electron

$\frac{1}{2}\times 9.11\times 10^{-31}v^2=1.6\times 10^{-19}\times 13.045=2.1406\times 10^6 m/sec$

so the velocity of electron will be 2.1406× $10^6$ m/sec

4 0

3 years ago

By quadrupling the mass of the body hanging on the thread what will become the period of oscillation?

nikklg [1K]

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The question gives us no evidence that it is doing any oscillating, and there's no reason for it to start just because it suddenly got heavier.

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3 years ago