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disp("Part a");
v=120;
i=.5;
p=v*i;
disp("the power (in W) used by the lamp is"); disp(p);
disp("Part b");
disp("the rate (in J/s) at which heat is converted to light is"); disp(p);
disp("Part c");
t=60;
e=p*t;
disp("the amount of energy (in J) used by the lamp is"); disp(e);
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