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OLEGan [10]
3 years ago
6

If you were to choose one, which of Earth's spheres is the most important, and why?

Physics
1 answer:
Molodets [167]3 years ago
7 0

Earth's land makes up the geosphere.

Earth's water makes up the hydrosphere. ...

Earth's air makes up the atmosphere. ...

Earth's living things make up the biosphere. ...

The four spheres interact. ...

Humans can have major impacts on all the spheres.

pick one

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A 40 kg box has a surface area of 0.2 m2, determine its pressure.
vesna_86 [32]

Answer:

P = 1960 Pa

Explanation:

The pressure is computed as the force acting upon a surface divided by the area of the surface

P=\frac{F}{A}

The box has 40 kg, it presses on its own surface when placed over a table or any flat area. The acting force is its weight.

F = W = m.g = 40 kg \ 9.8m/sec^2 = 392 N

The pressure is:

P=\frac{392N}{0.2m^2}=1960 \ Pa

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3 years ago
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3 years ago
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marysya [2.9K]

Answer:

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8 0
3 years ago
By means of a rope whose mass is negligible, two blocks are suspended over a pulley, as the drawing shows. The pulley can be tre
tankabanditka [31]

Answer:

Mass of the pull is 77 kg

Explanation:

Here we have for

Since  the rope moves along with pulley, we have

For the first block we have

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T₁ =  3/4(m₁g) = 323.4 N

Similarly, as the acceleration of the second block is the same as the first block but in opposite direction, we have

T₂ - m₂g = m₂a = m₂g/4

T₂ =  5/4(m₂g) = 134.75 N

T₂r - T₁r = I·∝ = 0.5·M·r²(-α/r)

∴ M = -\frac{2}{a} (T_2-T_1)

M = -\frac{2}{2.45} (134.75-323.4) = 77 \, kg

Mass of the pull = 77 kg.

5 0
3 years ago
In order to increase the amount of work completed, it is necessary to decrease the force applied to an object. decrease the time
wlad13 [49]
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Two items are provided as a basis for that conclusion:
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m is the mass of an object,
and a is the acceleration of the object.

And 2: work = force x distance or W = F x d.</span></span>
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