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kupik [55]
3 years ago
15

Which of these events is caused by contact forces?

Chemistry
1 answer:
harkovskaia [24]3 years ago
3 0

Earthquakes along the San Andreas fault in California.

<u>Explanation</u>:

  • When the two plates collide with each other, earthquakes occur. The contact between them makes this earthquake possible. The contact forces are responsible for the earthquakes as there is contact between two plates.          
  • The gravitational force is a force that is responsible for elevated tides happening on the east coast or the Jupiter's moons to remain in orbit. But this is not a contact force as there is no contact between them
  • Moreover, Without any contact, the magnetic force is a non-contact as it attracts the pins from a distance.          
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Answer:

See explanation

Explanation:

TLC is a chromatographic method in which the solute is spotted on a plate and the plate is placed in an air tight chamber containing a solvent. The solvent is maintained below the level of the spot. The capillary movement of the solvent through the plate achieves the required separation.

If two spots have Rf values of 0.25 and 0.26 respectively and then the plate was removed from the developing chamber, subsequently, the residual solvent was allowed to evaporate from the plate, and then the plate was returned to the developing chamber.

It will be observed after the second development is complete that the new Rf values will be 0.50 and 0.52 respectively. It will just be as though the second chromatogram picked up from where the first chromatogram stopped.

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2 years ago
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Explanation: I hope that helped !!

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A family takes a summer vacation to Florida. They drive for 8 hours before stopping at a hotel for the night. They
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Average speed of the trip = 52 km/hr

<h3>Further explanation  </h3>

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