In the Bohr model of the atom, the ground-state electron in hydrogen has an orbital speed of 2190 km/s.The mass of an electron is 9.1110^{-31}. What is its kinetic energy?

If you drop a 1.0-kg weight (about 2 lb) from a height of 1.0 m, how many joules of kinetic energy will it have when it reaches the ground?

Is it reasonable that a 30-kg child could run fast enough to have 100 J of kinetic energy?

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