A copper weight weighs 268 N in air and displaces an amount of water weighing 30. N . What is the weight of the copper measured
2 answers:
Answer:
238 N
Explanation:
Archimedes principle states that every body submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the body:
Here, is the immersed weight of the copper, and
is the weight of the displaced water. Due to this, the copper has a weight when immersed in water of:
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Answer:
please read the answer below
Explanation:
To find the electric field you can consider the Gaussian law for a cylindrical surface inside the slab.
where Qint is the charge inside the Gaussian surface, AG is the area of the surface and rho is the charge density of the slab.
By using the formula for the volume of a cylinder you obtain:
where h is the height. If you assume that the slab is in the interval (-zo<z<z0) you can write VG:
Finally, by replacing in the expression for E you get:
hence, for z>0 you obtain E=pz/eo > 0
for z<0 -> E=pz/eo < 0