The law of repulsion by Coulomb agrees with:
2 answers:
Answer & explanation:
Coulomb's law refers to the forces of interaction (attraction and repulsion) between two punctual electrical charges, that is, with negligible size and mass.
According to the principle of attraction and repulsion, charges with opposite signs are attracted and with equal signs are repelled, but these interaction forces have equal intensity, regardless of the direction in which the vector describing them points.
Through laboratory measurements, Coulomb determined that the value of the modulus of force that exists between two charged spheres, one charge (Q1) and another charge (Q2), is proportional to the product, in modulus, of its loads and inversely proportional to the square of the charge in a distance d between them. This can be described in the following equation:
Where F is the force between the charges, Q₁ and Q₂ being the modulus of the charges of the spheres and d is the distance between them, while k is called the electrostatic constant.
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Answer:
Check body of the explanation
Explanation:
Ooook, quick theory rushdown. if you're at a depth of h in a tank of a fluid, the pressure is the sum of the atmosferic pressure (if the tank is open on top) plus a term which is the product of acceleration of gravity - about , the density of whatever you're sinking in, and the depth at which you are. In formula,
, and the pressure is the same for every point of the tank at the same depth.
At this point, we can start answering!
1a. The pressure at A is - not counting atmosferic pressure - , while in B is
, so it's half of it.
1b. The two points are at the same depth, so the pressure is the same - they would be even if the two cilinders weren't linked!
1c. Ditto. Same depth? same pressure!
1d. Usual equation, this time density is 800. Pressure is : Since the density is 4/5 of water, the pressure is also 4/5 of the one exerted by water
2a. The volume is simply the product, so
2b. Density is defined as mass over volume, so you simply multiply the volume you found earlier by the density of paraffine:
2c. Weight is defined as the mass of something times the acceleration due to gravity, in our case it's
2d. again, what a surprise!
3. Yet again, .