Physics, 12.01.2021 14:00 kaziyahf2006

a plane flies from Addis Ababa to Gamble is 400km. in 2 hrs, then straight back to Gamma is 200km. in 1hrs what is the average speed, average velocity, total distance and total displacement

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Answer from: ShelleyPSeliger

a) Average speed = 200 Km/hr

b) Average velocity = 0 m/s

c) Total distance = 800 Km

d) Total displacement = 0 Km

Explanation:

a) Let the speed of the plane from Addis Ababa to Gamble be represented by $S_{1}$ , and from Gamble to Addis Ababa by $S_{2}$ .

Average speed = $\frac{S_{1} + S_{2} }{2}$

$S_{1}$ = $\frac{distance}{time}$ = $\frac{400}{2}$

= 200 Km/hr

$S_{2}$ = $\frac{distance}{time}$ = $\frac{200}{1}$

= 200 Km/hr

Average speed = $\frac{200 + 200}{2}$

= 200 Km/hr

b) Velocity = $\frac{displacement}{time}$

Average velocity = $\frac{total displacement}{total time taken}$

Since the plane flies from Addis Ababa to Gamble, then back to Addis Ababa, its total displacement is zero.

So that,

Average velocity = 0 m/s

c) Total distance = 400 Km + 400 Km

= 800 Km

d) Total displacement = 400 Km + (-400 Km)

= 0 Km

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

there are no components of a physical goal mentioned on the list of choices that you've provided.

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