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sp2606 [1]
3 years ago
13

Neil Armstrong, the first human being to step on the moon, left a foot print that is essentially unchanged nearly 50 years later

. How is it possible for this, and all the other footprints, tracks and markings, left on the lunar surface to remain unchanged for so long?
Physics
1 answer:
Likurg_2 [28]3 years ago
6 0

Since the boot-print was left there nearly 50 years ago, there has been very little wind and very little rain in that area, and plus, there have been very few people or other animals walking around in that spot to disturb it.

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You have an electrically neutral toy that you divide into two pieces. You notice that at least one of those pieces has an electr
musickatia [10]

Answer:

Attract

Explanation:

According to the properties of charge, the bodies having unlike charges attract each other and the bodies having like charges repel each other.

As the toy is initially electrically neutral, so as it is divided into two pieces, then according to the conservation of charge, the one piece having positive charge and the other piece having negative charge. As they are unlike charges so they attract each other.

8 0
4 years ago
Star-forming clouds appear dark in visible-light photos because the light of stars behind them is absorbed by __________.
Ostrovityanka [42]

Answer:

Interstellar Dust

Explanation:

In the solar system Interstellar dust is a type of cosmic dust and unlike Interstellar gas they have large dust particles enabling them to block visible light. Unlike smoke and fog, they contain large number of closely packed clumps of atoms and molecules

7 0
3 years ago
Read 2 more answers
What is the frequency of a sound wave having a velocity of 341 meters/second and a wavelength of 0.8 meters?
Brums [2.3K]
We know, Frequency = speed / wavelength 
f = 341 / 0.8
f = 426.25 Hz

In short, Your Answer would be 426.25 Hz

Hope this helps!
6 0
3 years ago
Read 2 more answers
A voltmeter with resistance rv is connected across the terminals of a battery of emf e and internal resistance r. Find the poten
Agata [3.3K]

Answer:

V = I(R+r)

Explanation:

According to ohms law, the current (I) passing through a metallic conductor at constant temperature is directly proportional to the potential difference (V) across its end.

Mathematically, V= IR where V is the potential difference

I is the current

R is resistance

Given emf (E) = IRt... (1)

where E is the emf

Rt is the total equivalent resistance

The external resistance Rv is connected in series with the internal resistance 'r' to give total equivalent resistance Rt = (R+r)

Substituting in equation 1

E = I(R+r)

The equivalent potential difference V = I(R+r)

6 0
3 years ago
A new ride being built at an amusement park includes a vertical drop of 126.5 meters. Starting from rest, the ride vertically dr
yan [13]

Answer:

49.79 m/s

Explanation:

Given:

Initial velocity of the roller coaster is, u=0\ m/s

Vertical drop or the displacement of the roller coaster is, y=-126.5\ m

The displacement is negative as the motion is in downward direction.

Now, as the motion is in vertical direction only, the acceleration of the roller coaster will be due to gravity acting in the downward direction.

So, the acceleration of the roller coaster is, a=g=-9.8\ m/s^2

Now, using the following equation of motion:

v^2=u^2+2ay

Where, 'v' is the velocity of the roller coaster at the bottom.

Plug in all the given values and solve for 'v'. This gives,

v^2=0^2+2(-9.8)(-126.5)\\\\v^2=2479.4\\\\v=\sqrt{2479.4}\\\\v=49.79\ m/s

Therefore, the speed of the roller coaster at the bottom of the drop is 49.79 m/s.

7 0
4 years ago
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