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Consider (Figure 1) showing a proton approaching a helium-3 nucleus that has two protons and one



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The initial and final stages of a proton approaching helium-3 nucleus. The proton has charge plus e and mass m. The nucleus consists of two protons and a neutron and has charge plus 2 e and mass 3 m. The proton is at effectively infinite distance r subscript 0 to the left from the nucleus in the initial position. The proton moves horizontally to the right at speed v. The proton has zero speed and is located at distance r to the left from the nucleus in the final position.

Part A

Determine the speed at which the proton must be moving in order to get within 1.2×10



1.2×10−15m of the helium-3 nucleus. Assume that the helium nucleus is a point-like object and does not move.

Express your answer with the appropriate units.

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