2(i)
(a) When does the nucleus of an atom tend to become radioactive?
(b) Name a single pulley in which displacement of load and effort is not the same.
(c) State one advantage of this pulley.
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(a) The nucleus of an atom becomes radioactive when number of neutrons in the nucleus exceeds the number of protons in it.
(b) Single movable pulley.
(c) Advantage of this type of pulley is that we can lift a heavier load with a small effort.