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givi [52]
3 years ago
10

In an experiment, you find the mass of a cart to be 250 grams. What is the mass of the cart in kilograms?

Physics
2 answers:
postnew [5]3 years ago
7 0
The answer is:  0.25 kg  .
______________________________

250 g * ( 1 kg / 1000 g) = (250/ 1000) kg = 0.250 kg = 0.25 kg .
gizmo_the_mogwai [7]3 years ago
5 0
It should be 0.25kg because you converter from g to kg and since 1g<1kg so you move the decimal to the left
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Find the magnitude of the angular momentum of the second hand on a clock about an axis through the center of the clock face. Ass
Naddika [18.5K]

Answer:

L = 4.711 *10^{-6} kg m2/s

Explanation:

i =\frac{ml^3}{3}

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angular velocity

\omega = \frac{2\pi}{60}

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the angular momentum,

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3 0
3 years ago
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Answer:

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3 years ago
What is the value of n in the balmer series for which the wavelength is 410.2 nm.?
m_a_m_a [10]

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What is Balmer series?

The Balmer series is the portion of the emission spectrum of hydrogen that represents electron transitions from energy levels n > 2 to n = 2. These are four lines in the visible spectrum. They are also known as the Balmer lines. The four visible Balmer lines of hydrogen appear at 410 nm, 434 nm, 486 nm and 656 nm.

For the Balmer series, the final energy level is always n=2. So, the wavelengths 653.6, 486.1, 434.0, and 410.2 nm correspond to n=3, n=4, n=5, and n=6 respectively. Since the last wavelength, 410.2 nm, corresponds to n=6, the next wavelength should logically correspond to n=7.

To solve for the wavelength, calculate the individual energies, E2 and E7, using E=-hR/(n^2). Then, calculate the energy difference between E2 (which is the final) and E7 (which is the initial). Finally, use lamba=hc/E to get the wavelength.

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2 years ago
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