त्रिज्या R के एक ठोस अर्धगोले (solid hemisphere) के लिए, इसके समतल आधार से सममिति अक्ष के अनुदिश केंद्रक (centroid) की ऊंचाई किसके द्वारा दी जाती है?

A particle is subjected to two coplanar horizontal forces acting along the same line: a force of 2.0 kN towards the right and a force of 1.5 kN towards the left. What is the net unbalanced horizontal force acting on the particle?

For a right circular solid cone of height h, the distance of the center of gravity from the base is .