Physics 9702 · AS & A Level · Gravitational potential energy and kinetic energy

Gravitational potential energy and kinetic energy — practice question

A uniform solid cuboid made of concrete, with dimensions $0.50\,\text{m} \times 1.20\,\text{m} \times 0.40\,\text{m}$ and weight $4000\,\text{N}$, is at rest on a level surface with the $1.20\,\text{m}$ edge upright, as illustrated in diagram 1. Calculate the least energy needed to rotate the cuboid through $90^{\circ}$ into the arrangement shown in diagram 2, where the $0.50\,\text{m}$ edge is upright.

  • A$200\,\text{J}$
  • B$400\,\text{J}$
  • C$1400\,\text{J}$
  • D$2600\,\text{J}$

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