Define rotational speed?- short answer

Physics

1 answer:

Marina86 [1]4 years ago

3 0

Rotational speed of an object around an axis is the numbers of turns of the object divided by time. <span />

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3. Three metal spoons are on a table. They are each at room temperature. If the three spoons

Masja [62]

If the spoons touch, no heat will flow among the spoons. This is because they are already at thermal equilibrium with each other. This is hinted by the statement "they are at room temperature" which means they all have the same temperature. Heat only flows when there is a difference in temperature.

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4 years ago

How much energy (in kj) do 3.0 moles of photons, all with a wavelength of 670 nm, contain? how much energy (in kj) do 3.0 moles

Kisachek [45]

1 mole of photons contain $6.023 \cdot 10^{23}$ photons (Avogadro number). This means that 3.0 moles of photons contain
$N=3\cdot 6.023 \cdot 10^{23} =1.81 \cdot 10^{24}$ photons.

The wavelength of the light in the problem is $\lambda=670 nm=670\cdot 10^{-9}m$ , so the frequency is
$f= \frac{c}{\lambda}= \frac{3\cdot 10^8 m/s}{670 \cdot 10^{-9}m}=4.48 \cdot 10^{14}Hz$

The energy carried by a single photon is
$E=hf$
where $h=6.62 \cdot 10^{-34}Js$ is the Planck constant, while f is the frequency. Since this is the energy carried by a single photon, the energy carried by 3.0 moles of photons will be the energy of the single photon multiplied by the total number of photons:
$E=Nhf=(1.81 \cdot 10^{24})(6.62 \cdot 10^{-34}Js)(4.48 \cdot 10^{14}Hz )=5.36 \cdot 10^5 J$
which corresponds to E=536 kJ.

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3 years ago

The form of energy given off by the vibrating strings of the violin is? A. Electrical Energy B. Potential Energy C. Radiant Ener

S_A_V [24]

Answer:

D . Sound energy

Explanation:

When the strings of a violin vibrate it produces sound which is sound energy. Due to the vibration of the strings the air present near the strings also vibrate in resonance with the strings. This compreesion and decompression's produced in the air is nothing but the sound. So the form of energy given off by the vibrating strings of the violin is Sound energy.

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3 years ago

A soccer ball is kicked and travels 25 meters to the north in 4 seconds. At what velocity is the ball traveling?

storchak [24]

Answer:

Explanation:

v = d/t

v = 25 m / 4 s

v = 6.25 m/s north

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3 years ago

The biosphere contains

Natali [406]

C. is the answer to this question

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4 years ago

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