Athief plans to steal a gold sphere with a radius of 28.5 cm from a museum. if the gold has a density of 19.3 g/cm3, what is the mass of the sphere in pounds? [the volume of a sphere is v=(4/3)ïr3.]

Radius of gold sphere radius r=28.5
The volume of the sphere is =4/3*3.14*r*r*r.
=1.01*10^5 cm^3.
The density of gold is 19.3 g/cm^3.
The relation between the density, volume, and mass
Density=Mass/Volume.
1.95*10^6 g=Mass
1.95*10^6 g *0.0022 pounds
4.29*10^3 pounds.
Hence mass of the sphere is 4.29*10^3 pounds.

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current