All the edges of a block with parallel faces are unequal. Its longest edge is twice its shortest edge. The ratio of the maximum to minimum resistance between parallel faces is.

The sides of rectangular block are 2 cm, 3 cm ad 4 cm. The ratio of the maximum to minimum resistance between its parallel faces is

The edge of a cube is 4 cm . Find the ratio of its tota surface area to the area of its vertical faces.

Twelve identical resistances arranged on all edges of a cube. The resisors are all the same. Then find the equivalent resistance between the edges A and B as shown in.

Comprehesion-I Let k be the length of any edge of a regular tetrahedron (all edges are equal in length). The angle between a line and a plane is equal to the complement of the angle between the line and the normal to the plane whereas the angle between two plane is equal to the angle between the normals. Let O be the origin and A,B and C vertices with position vectors veca,vecb and vecc respectively of the regular tetrahedron. The angle between any edge and a face not containing the edge is

Name the groups of all possible parallel edges of the box whose figure is shown below.

In Figure,name the face parallel to BFGC faces adjacent to BFGC three edges which meet in the vertex G.

Let k be the length of any edge of a regular tetrahedron (a tetrahedron whose edges are equal in length is called a regular tetrahedron).Show that the angle between any edge and a face not containing the edge is cos^(-1)(1/sqrt(3))