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3 years ago

Physical Science AIS - AE 20-21-Kotal / Unit 2: Reactions and Radioactivity / The Environment

Physics

1 answer:

astraxan [27]3 years ago

6 0

Answer:19

Explanation:

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Once an object enters orbit, what keeps the object moving sideways?

zubka84 [21]

Answer: Inertia!!

Explanation: I just completed the edg quiz and got that answer correct! Hope its not too late for you!

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3 years ago

Which combination of initial horizontal velocity, (vh) and initial vertical velocity, (vv) results in the greatest horizontal ra

Naya [18.7K]

If an object is projected with vertical speed given as

$v_v$

now the time of flight of the object that time in which it comes back on ground

$\Delta y = v_v t + \frac{1}{2}(-g)t^2$

now here we will have

$0 = v_v t - \frac{1}{2}gt^2$

$t = \frac{2v_v}{g}$

now the range of projectile is given as

$R = horizontal\: speed \times time$

$R = v_h(\frac{2v_v}{g}$

now here we know that

$v_v = v_0 sin\theta$

$v_h = v_0 cos\theta$

now the range is given as

$R = \frac{2(vsin\theta)(vcos\theta)}{g}$

$R = \frac{v^2sin2\theta}{g}$

now in order to have maximum range we can say

$sin2\theta = 1$

$2\theta = 90^0$

so we will have

$\theta = 45 ^0$

so now we can say

$v_v = v_h = \frac{v_0}{\sqrt2}$

so both speed must be same to have maximum horizontal range

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3 years ago

EASY BUT PLEASE HELP<br> Compare and contrast infrared waves, light waves, and ultraviolent waves

sveticcg [70]

Answer:

Infrared waves have a wavelength 1,000x longer than ultraviolet waves (10^-16 vs 10^-13). ... The amplitude (or height) of an electromagnetic wave is proportional to its intensity

Explanation:

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3 years ago

Which energy resources are found above the Earth's surface?

OverLord2011 [107]

Answer:

Hey

Your answer would be B) B) solar, wind, biomass

Hydroelectric, uranium Geothermal=bellow earth's surface.

Coal, Oil, Natural gas=bellow earth's surface.

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3 years ago

What's difference between results in dot product and cross product of vectors.

Orlov [11]

Answer:

A dot product of two vectors is also called the scalar product. ... The difference between the dot product and the cross product of two vectors is that the result of the dot product is a scalar quantity, whereas the result of the cross product is a vector quantity.

Explanation:

Hope it is helpful.....

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3 years ago