(2011? Honghe Prefecture) Mengzi City, where the capital of Honghe Prefecture is located, uses a solar lighting lamp as shown in the picture. Average solar panel per square meter

(1) t1=8h, S=0.3m2,

The solar energy collected by a solar panel in one day:

W total=4×106J/ (h.m2)×8h×0.3m2=1.04×107J;

(2)t2=10h=36000s,

∵W=Pt

∴ The electric energy consumed by the lamp is: W useful = Pt = 40W × 36000s = 1.44 × 106 J;

So the efficiency of solar lighting using solar energy:

η = W useful W total ×100%=1.44×106J1.04×107J×100%≈13.8%．

(3) Solar energy collected by 30 solar panels in one year:

W total′=1.04×107J×30×365=1.1388×1011J,

This energy is equivalent to the complete combustion of mkg coke,

∵Q absorption=Q release=mq

∴m=Q absorption q=1.1388×1011J3×107J/kg=3796kg.

Answer:

(1) The solar energy collected by a solar panel in one day is 1.04×107J;

(2) The solar panel converts solar energy into electrical energy The efficiency is 13.8%.

(3) Equivalent to the energy released by the complete combustion of 3796 kilograms of coke.