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Q. An alpha particle with kinetic energy 17.0 MeV makes a head-on collision with a lead nucleus at rest. What is the distance of closest approach of the two particles? (Assume that the lead nucleus remains stationary and that it may be treated as a point charge. The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.)

Q. A 35 kg box is being pushed up a ramp with a force of 115 N. The length of the ramp is 5.00m. How much work is being done on the box?

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