2 years ago

Which sentence is correct?

Physics

1 answer:

Alexeev081 [22]2 years ago

7 0

Answer:

pretty sure its B if it isnt im so so sorry

Explanation:

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Calculate the tangential speed of a yo-yo twirled at the end of a 4 meter long string at 2 revolutions per second.

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Answer: 50 m/s

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2 years ago

A periodic wave has a wavelength of 0,50 m and a speed of 20 m/s, What is the wave frequency?

faltersainse [42]

Answer:

u=speed, w=wavelenght, f=frequency

It's known that u=w*f => f=u/w

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w=0,50m

Explanation:

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1 year ago

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3 years ago

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Many web sites describe how to add wires to your clothing to keep you warm while riding your motorcycle. The wires are added to

Tomtit [17]

Answer:

$P=42.075W$

Explanation:

The power provided by a resistor (wire in this case) is given by:

$P=\frac{V^2}{R}$ .

The resistance of a wire is given by:

$R=\frac{\rho L}{A}$

Where for the resistivity the one of the copper should be used: $\rho=1.68\times10^{-8}\Omega m$ .

The area A is that of a circle, which written in terms of its diameter is:

$A=\pi r^2=\pi (d/2)^2=\frac{\pi d^2}{4}$

Putting all together:

$P=\frac{AV^2}{\rho L}=\frac{\pi d^2V^2}{4\rho L}$

Which for our values is:

$P=\frac{\pi (0.00025m)^2(12V)^2}{4(1.68\times10^{-8}\Omega m)(10m)}=42.075W$

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3 years ago