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A certain atom has atomic number Z = 20 and atomic mass number A = 42.
(a) What is the approximate radius of the nucleus of this atom?
rnucleus = _______ m
(b) What is the magnitude of the electrostatic force of repulsion between two protons on opposite sides of the diameter of the nucleus.
F = _______N
Practical steam engines utilize 450°C steam, which is later exhausted at 250°C. What is the overall efficiency of the two engines
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