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3 years ago

PLEASE HELP ASAP GIVING 33 POINTS FOLLOW ALL THE INSTRUCTIONS

Physics

1 answer:

GuDViN [60]3 years ago

7 0

Mars landscape reminds me of the deserts of California. Mars remained deserted because life and photosynthesis doesn’t exist yet in Mars. It just have steep mountains/hills, and rocks. Since Mars has no soil, the material is called regolith.

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Astronomers observe a spectral analysis of a distant star where a particular element has a spectral line with a wavelength of 66

tekilochka [14]

Answer:

(a). The velocity of star is $8.1\times10^{6}\ m/s$ and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

Explanation:

Given that,

Wavelength of spectral line = 663 nm

Wavelength of spectral line in lab = 645 nm

(a). We need to calculate the velocity

Using doppler's effect

$\Delta \lambda=\dfrac{v}{c}\lambda$

Where, $\Delta\lambda$ = change in wavelength

v = velocity

c = speed of light

Put the value into the formula

$663-645=\dfrac{v}{3\times10^{8}}\times663$

$v=\dfrac{3\times10^{8}(663-645)}{663}$

$v=8144796.38\ m/s$

$v=8.1\times10^{6}\ m/s$

The direction of star toward the earth.

(b). Speed = 7800 m/s

We need to calculate the shift

Using formula of shift

$\Delta \lambda=\lambda(\sqrt{\dfrac{1+\dfrac{v}{c}}{1-\dfrac{v}{c}}}-1)$

Put the value into the formula

$\Delta \lambda=645\times(\sqrt{\dfrac{1+\dfrac{7800}{3\times10^{8}}}{1-\dfrac{7800}{3\times10^{8}}}}-1)$

$\Delta\lambda=0.0168\ nm$

This shift is small compare to the the movement of Earth around the sun.

Hence, (a). The velocity of star is $8.1\times10^{6}\ m/s$ and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

7 0

3 years ago

An object that is in free fall seems to be

Ratling [72]

<span>An object that is in free fall seems to be weightless, even though the
usual force of gravity is acting on it.

If the falling object happens to be a person, then every part of him is
falling at the same rate, so none of his internal organs are pressing
against anything like they normally do, and he has no sensation of weight.

If a bathroom scale happens to be falling with him and he places it under
his feet, it won't read anything, since the scale and the person are both
falling at the same rate. </span>

5 0

4 years ago

In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.60 m/s relative to the ground. A teamma

spayn [35]

Answer:

Part a)

$v_{bj} = 11.03 m/s$