The time rate of decrease of density of a moving fluid element (particle) of fixed mass as it passes through a given point in a flow field is−0.2 kg/m3 sec. the density of the fluid element at that point is 1.21 kg/m3. calculate the time rate of change of volume of this moving fluid element as it passes through the given point by two methods: (a) using just the physical geometry of the element, and (b) using directly the continuity equation in the form of equation +휌휌∇⋅푉푉�⃗=0.

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge

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