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4 years ago

Does the earths magnetic field reverse every year or so?

Physics

1 answer:

shusha [124]4 years ago

3 0

Answer:

"The reversal rate for the earth's magnetic field has been varied over the ears. 72 million years ago the field has been reversed for 5 times in a million years."

Explanation:

Looking at the magnetic fingerprints locking that has been present in the ancient rock, we can predict that in the last 20 millions years the magnetic north and the south has been flipped roughly in every 200,000 to 300,000 years. The field gets deflected from the speeding particles towards the earth's poles. The magnetic field around the Earth is getting weakened and it is claimed by the scientist that it could have been gone in as little as 500 years.

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A child wants to pump up a bicycle tire so that its pressure is 1.2 × 105 pa above that of atmospheric pressure. if the child us

WINSTONCH [101]

General expression is;
Pressure = Force/Area
In which,
Pressure = Required pressure + Atmospheric pressure = (1.2*10^5) + (101325) = 221325 Pa = 221325 N/m^2

Area = πD^2/4 = π*0.035^2/4 = 9.621*10^-4 m^2

Therefore,
Force, F = Pressure*Area = 221325*9.621*10^-4 = 212.94 N

7 0

3 years ago

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umka21 [38]

Answer:it would be C

Explanation:

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4 years ago

A movie stunt performer is filming a scene where he swings across a river on a vine. The safety crew must use a vine with enough

Julli [10]

Answer:

1125.66956 N

Explanation:

m = Mass of stunt performer

g = Acceleration due to gravity = 9.81 m/s²

v = Velocity of the swing = 7 m/s

T = Tension

r = Radius of the swing = Length of vine = 11.5 m

From the free body diagram

$T-mg-m\frac{v^2}{r}=0\\\Rightarrow T=mg+m\frac{v^2}{r}\\\Rightarrow T=m(g+\frac{v^2}{r})\\\Rightarrow T=80(9.81+\frac{7^2}{11.5})\\\Rightarrow T=1125.66956\ N$

The minimum tension force the vine must be able to support without breaking is 1125.66956 N

7 0

3 years ago

When u wake up in the morning and you see few on the ground, where did it come from, and how did it form?

Pavlova-9 [17]

Answer:

If you mean dew not few, than the cause of dew is condensation.

Explanation:

At night, the air temperature gets lower, causing the water in its vapor state in the air to turn to the liquid state.The water will gather on most solid surfaces, especially grass and other plants. The dew came from the water in the air.

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3 years ago

7. The S.l. unit for force is<br> A. kg<br> C. m/s<br> B. m/s2<br> D. N

netineya [11]

D.N(Newton) this is the S.I unit for force

5 0

3 years ago