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qwelly [4]
2 years ago
14

When were Earth’s landmasses first recognizable as the continents we know today? 10 million years ago 135 million years ago 180

million years ago 300 million years ago
Physics
2 answers:
Bess [88]2 years ago
6 0

Answer:

b

Explanation:

i took the test

cluponka [151]2 years ago
6 0

Answer:

b 135 million years

Explanation:

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Suppose that a rectangular toroid has 2,000 windings and a self-inductance of 0.060 H. If the height of the rectangular toroid i
andrey2020 [161]

Answer:

0.01154 A

Explanation:

We have given the energy in the magnetic field U=4\times 10^{-6}J

Value of inductance L =0.060 H

Energy stored in magnetic field is given by U=\frac{1}{2}Li^2

i=\sqrt{\frac{2U}{L}}

i=\sqrt{\frac{2\times 4\times 10^{-6}}{0.06}}=0.01154\ A

So the current flowing through rectangular toroid will be 0.01154 A

3 0
2 years ago
Which, if any, of the following statements concerning the work done by a conservative force is NOT true? All of these statements
masya89 [10]

Answer:

When the starting and ending points are the same, the total work is zero.

Explanation:

option ( D )correct

A force is said to be conservative when the work done by the force in moving a particle from a point A to a point B is independent of the path followed between A and B and is the same for all the paths. The work done depends only on the particles initial and final positions. And when the initial and final position in conservative field are same the work done is said to be zero.

8 0
2 years ago
For incident ray C, the angle of refraction is 90°. The refracted ray C has the smallest amount of energy of any refracted ray.
Usimov [2.4K]

Answer:

Explanation:

When a ray of light travels into rarer medium from the denser medium and the angle of refraction is 90° so the angle of incidence in the denser medium is called critical angle for that pair of media.

Here, the angle of refraction is 90°, so the angle of incidence C is called the angle of incidence which is equal to the critical angle.

8 0
2 years ago
A student placed an ice cube on a table and observed it for five minutes. He noticed that the ice cube seemed to get smaller and
Reil [10]

Answer:

the ice cube melted due to the absorption of heat from the surrounding of the ice, the has a heat capacity of zero so it turns it from its solid state to its liquid state which leads to the formation of the puddle

8 0
2 years ago
A11) A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic fiel
vitfil [10]

Answer:

A

Explanation:

From a Solenoid we know that a magnetic fiel is always inversely proportional to lenght L or BL = constant

B= frac{\mu_0}{2R}

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B2 = 2mT*\frac{18}{21}

B2 = 1.714mT

7 0
2 years ago
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