Certainly, here are the packing efficiencies for cubes and pyramids:

1. Cubes: A cube has a packing efficiency of 52.4%. This means that in a three-dimensional space, only 52.4% of the total volume can be occupied by cubes with no gaps between them.

2. Pyramids: The packing efficiency of pyramids varies depending on the shape of the base and the angle of the sides. Generally, the packing efficiency of a pyramid is lower than that of a cube. For example, a regular tetrahedron has a packing efficiency of approximately 34.3%, while a regular octahedron has a packing efficiency of approximately 68.0%.

3. Cylinders: The packing efficiency of cylinders also depends on the size and shape of the cylinder. A simple approximation for the packing efficiency of cylinders is 64%, assuming they are packed in a hexagonal arrangement. However, the actual packing efficiency of cylinders can vary depending on the height-to-radius ratio of the cylinder.

4. Cones: Cones have a packing efficiency of approximately 35.3%. Similar to cylinders, the actual packing efficiency of cones can vary depending on the angle of the cone and the height-to-radius ratio.

5. Rectangular prisms: Rectangular prisms, also known as cuboids, have a packing efficiency of approximately 68%. This assumes that the prisms are packed in a face-centered cubic arrangement, with no gaps between them.

It's worth noting that packing efficiency is influenced by various factors, such as the shape and size of the objects being packed, as well as any external forces acting on the system. Therefore, the packing efficiency of real-world objects may differ from theoretical values.
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