Answer: 1350kg/m3
Explanation:
Db = Mb/Vb
900= Mb/Vb
(where Db is the density of the block of wood = 900kg/m3, Mb is its mass and Vb is its volume
Df = Mf/Vf (where Df, Mf and Vf are the density, mass and velocity of the fluid respectively
note that the same mass is involved because the block of wood can only displace its own mass of the fluid
It displaces two-thirds of its own volume in the fluid.
2/3Vf = Vb
Vf = 2Vb/3
Db = Mb/Vb
900 = 2Mb/3Vf
2700Vf = 2Mb
1350Vf = Mb
since Mb = Mf
Df = 1350Vf/Vf
Df= 1350Kg/m3
Answer:
Charge on each is 2 x 10⁻¹⁰.
Explanation:
We know that Force between two point charges is given b the Coulomb's law as:
F = kq₁q₂/r^2
k = 9 x 10^9
r = 3.00 cm
= 0.03 m
q₁ = q₂
F = 4.00 x 10^-7
Rearranging the formula, we get:
F = k q²/r²
q² = Fr²/k
q² = 4 x 10⁻⁷ x 0.03²/(9x10⁹)
q² = 4 x 10⁻²⁰
q = 2 x 10⁻¹⁰
As there is force of repulsion between the charges, the charges must be both positive or both negative.
Im really sorry. pls dont report this comment. i need points. I have a question but I am bad at english and I cant answer peoples
On top of a hill near the south pole of the Moon is a sunny spot that might make the ideal place for a lunar outpost, according to preliminary analysis of data from the European Space Agency (ESA) satellite SMART-1.
Answer:
Current flowing through the wire is 1.17 A
Explanation:
As we know that rate of flow of charge is given as electric current
Here we know that charge flow through the wire is
total time taken to flow the charge is
t = 8 min = 480 s
now the electric current is given as