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2 years ago

Four satellites are in orbit around the Earth. The heights of their four orbits

Physics

1 answer:

slavikrds [6]2 years ago

6 0

The gravitational pull of Earth is stronger in satellite A

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An airplane maintains a speed of 585 km/h relative to the air it is flying through as it makes a trip to a city 815 km away to t

navik [9.2K]

Answer:

a) t = 1.47 h b) t = 1.32 h

Explanation:

a) In this problem the plane and the wind are in the same North-South direction, whereby the vector sum is reduced to the scalar sum (ordinary). Let's calculate the total speed

v = $v_{f}$ f - $v_{w}$

v = 585 -32.1

v = 552.9 km / h

We use the speed ratio in uniform motion

v = x / t

t = x / v

t = 815 /552.9

t = 1.47 h

b) We repeat the calculation, but this time the wind is going in the direction of the plane

v= $v_{f}$ f - $v_{w}$

v 585 + 32.1

v = 617.1 km / h

t = 815 /617.1

t = 1.32 h

4 0

3 years ago

Physics 5

Darina [25.2K]

Answer:

0.85 A

Explanation:

the effective current is 0.85 A

6 0

2 years ago

A myopic person (assume no astigmatism) is diagnosed with a far point of 160 cm. What corrective prescription should they be sup

Kazeer [188]

Answer:

The person should use a convex lens of power -0.625 D.

Explanation:

Given that, the far point of the person, with myopic eye, is 160 cm.

It means that the image of an object, which is at infinity, is formed at this point 160 cm distance away from the person's eye.

If the object is infinity, then the object distance, u = - $\infty$ .

Image distance, v = -160 cm.

u and v are taken to be negative because the object and the image of the object are on the side of the eye from where the light is coming.

Let the focal length of the lens which is to be used for the correction of this myopic eye be f, then using lens equation,

$\rm \dfrac 1f = \dfrac 1v-\dfrac 1u=\dfrac 1{-160 }-\dfrac1{-\infty}=\dfrac 1{-160}-0=\dfrac 1{-160}.\\\Rightarrow f=-160\ cm.$

The negative focal length indicates that the lens should be convex.

The power of the lens is given by

$\rm P=\dfrac{1}{f}=\dfrac{1}{-160\ cm }=\dfrac{1}{-1.6\ m}=-0.625\ D.$

So, the person should use a convex lens of power -0.625 D.

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3 years ago

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Plant cells and animal cells were observed under a microscope. The characteristics of two cells are listed below. Cell A: Has a

ziro4ka [17]

C. The cell wall supports the plant cell as it contains celluose which is a very strong substance and even thought chloroplast is in both that is the only available answer. Hope it helps

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3 years ago

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In which type of wave does the medium move parallel to the direction of the energy transport?

creativ13 [48]

The <span>longitudinal wave. </span>

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3 years ago