How would replacing the aluminum core of an electromagnet with an iron core affect the electromagnet A. its strength would stay the same
B. it would become stronger
C. its strength would vary randomly
D. it would become weaker

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.