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3 years ago

9

You have to push a heavy box across three surfaces: a grassy field , ice rink, and a concrete playground. Which surface will be

easiest to push the box across and WHY ?

1 answer:

alukav5142 [94]3 years ago

7 0

Answer:

The ice rink because the ice is the surface with the lowest friction.

Explanation:

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Which model represents a fraction greater than 3/5

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3 years ago

A hydrogen atom in a galaxy moving with a speed of 6.65×106 m/???? away from the Earth emits light with a wavelength of 5.13×10−

Mumz [18]

Answer:

The observed wavelength on Earth from that hydrogen atom is $5.24\times 10^{-7}\ m$ .

Explanation:

Given that,

The actual wavelength of the hydrogen atom, $\lambda_a=5.13\times 10^{-7}\ m$

A hydrogen atom in a galaxy moving with a speed of, $v=6.65\times 10^6\ m/s$

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$v=c\times \dfrac{\lambda_o-\lambda_a}{\lambda_a}$

$\lambda_o$ is the observed wavelength

$\lambda_o=\dfrac{v\lambda_a}{c}+\lambda_a\\\\\lambda_o=\dfrac{6.65\times 10^6\times 5.13\times 10^{-7}}{3\times 10^8}+5.13\times 10^{-7}\\\\\lambda_o=5.24\times 10^{-7}\ m$

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3 years ago

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Answer:

the answer of question no5 is b

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