**Question1**

Visualize a crystal that exploits for binding Coulomb attraction of the positive and negative ions of the identical atom or molecule R. This is believed to occur with certain organic molecules, but it is not found when R is a single atom. Utilize the data in Tables 5 and 6 in Kittel to evaluate the stability of such a form of Na in the NaCl structure, relative to the normal metallic Na. estimate energy at the observed interatomic distance in metallic Na, and use 0.78 eV as the electron affinity of Na.

**Question2**

An airplane is flying with a velocity of 95.0m/s at an angle of 18.0^circ above horizontal. As the plane is a distance 104m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from a dog will the suitcase land? You can overlook air resistance.

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