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3 years ago

PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer these correctly!!!! (67pts)

Physics

1 answer:

laiz [17]3 years ago

7 0

Answer:

a toy car was on the floor in the play room until the child applied force by starting to race with it. it accelerated and proceeded to move at 5m/s east. it came to a stop when the bedpost applied force to it.

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Near the center of our galaxy, hydrogen gas is moving directly away from us in its orbit about a black hole. The electromagnetic

Aleonysh [2.5K]

Answer:

The speed of the gas relative to the earth = 6.314 * $10^{6} m/s$

Explanation:

Let the observed wavelength be $\lambda_{0} = 1915 nm$

The wavelength of the source, $\lambda_{s} = 1875 nm$

Let the speed of the gas relative to the earth be = v

The observed wavelength in relation to the source wavelength, according to doppler shift in relativity can be expressed as:

$\lambda_{0} = \lambda_{s}\sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }$

Where the speed of light, c = 3 * 10⁸m/s

$\frac{\lambda_{0}}{\lambda_{s}} = \sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }\\(\frac{\lambda_{0}}{\lambda_{s}})^{2} = \frac{1-\frac{v}{c} }{1+\frac{v}{c} }\\(\frac{1915}{1875}) ^{2}( {1+\frac{v}{c}) = ({1-\frac{v}{c} }) \\$

$1.043 +\frac{1.043v}{c} = 1 - \frac{v}{c} \\\frac{1.043v}{c} + \frac{v}{c} = 1-1.043\\2.043v = -0.043c\\v = \frac{-0.043c}{2.043} \\v = -0.02105c\\v = -0.02105 * 3 * 10^{8} \\v = -6314243.76 m/s\\The absolute value, v = 6314243.76 m/s\\v = 6.314 * 10^{6} m/s$

8 0

3 years ago

Which of earth’s spheres do mountains, lakes, trees, clouds, ice, and snow represent? (which sphere does each one belong in?)?

Lapatulllka [165]

Lakes and ice are the hydrosphere. Mountains and trees are the lithosphere. Clouds are the atmosphere. Snow is debatable, but I would say it fits in the atmosphere, since it generally flows through air, and isn't ever a permanent fixture on the planet's surface (lithosphere). While it is composed from water, it doesn't exist in or around the ocean for more than extremely brief periods, so it doesn't qualify for the hydrosphere. Ice is also debatable I suppose, but I took it to mean naturally occurring ice in glaciers, which constantly freeze and unfreeze in the ocean. Ice generally doesn't describe what we would consider "land", even if it forms the top layer of ground in many arctic and antarctic environments.

7 0

3 years ago

A piano has a mass of 99 kg. What is the weight of the piano?

Blababa [14]

Explanation:

weight of the piano = mg

w = 99 x 10 =990 N

7 0

3 years ago

John runs 120 meters in 10 seconds and then runs back to where he started in another 10 seconds. Which statement is true? Rememb

atroni [7]

Answer:

Explanation:

A. His speed is 0 m/s

B. His velocity is 12 m/s

C. His velocity is 0 m/s

D. His acceleration is 12 m/s

Total distance traveled by John = 120 + 120 = 240 meters

Total time taken by John to cover the distance = 10 + 10 = 20 s

Average speed of John = total distance traveled/total time taken

= 240/20 = 12 m/s

Hence, the average speed/velocity of John throughout the journey is 12 m/s.

The correct option is B.

4 0

3 years ago

When does air become turbulent around a thrown ball?

kherson [118]

Answer: B (on the rough side)

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8 0

4 years ago