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AGC/United Learning • 1560 Sherman Ave., Suite 100 • Evanston, IL 60201 • 800-323-9084

LAUREEN: TIMES C, WHICH FOR WATER IS 4.19 JOULES PER GRAM DEGREE CELSIUS. TIMES THE CHANGE IN TEMPERA- TURE...28.5 DEGREES CELSIUS. BRENDON: AND SO THE VALUE OF Q IS — LAUREEN: 5.61 KILOJOULES. BRENDON: AND THE FINAL MASS OF THE NUT WAS 0.030 GRAMS. THAT’S A CHANGE OF 0.370 GRAMS. LAUREEN: AND DIVIDING Q, 5.61 KILOJOULES, BY THE CHANGE IN THE MASS OF THE WALNUT, 0.370 GRAMS, GIVES THE EN- ERGY STORED OF 15 KILOJOULES PER GRAM. THAT’S ACCORD- ING TO OUR DESIGN. BRENDON: RIGHT. TO COMPARE THE RESULTS OF OUR SYS- TEM VERSUS REMY’S BOMB CALORIMETER, WE NEED THE RE- SULTS SHE GOT. REMY ESTIGOY: BASED ON THE NUMBER OF GRAMS THAT WE DID, WE FOUND OUT THAT THE ENERGY CONTENT OF A WAL- NUT IS 28 KILOJOULES PER GRAM. BRENDON: WE REPEATED OUR EXPERIMENT SIX TIMES AND GOT SIX DIFFERENT RESULTS. SO OUR AVERAGE VALUE IS 14 KILOJOULES PER GRAM. LAUREEN: BUT ACCORDING TO REMY, THE ENERGY CONTENT OF A WALNUT IS 28 KILOJOULES PER GRAM. BRENDON: SO TO COMPARE THE EFFICIENCY OF OUR SYSTEM TO HERS, WE GO BACK TO THE EQUATION: LAUREEN: SO THE OUTPUT VALUE WE CALCULATED, 14 KILO- JOULES PER GRAM, DIVIDED BY REMY’S INPUT VALUE, 28 KILO- JOULES PER GRAM. BRENDON: THAT’S 0.50 TIMES 100%, WHICH EQUALS 50%. LAUREEN: SO OUR SYSTEM IS ONLY 50% AS EFFICIENT AS REMY’S BOMB CALORIMETER. BRENDON: THAT’S A LOT OF WASTE ENERGY. LAUREEN: GOOD EQUIPMENT MAKES A BIG DIFFERENCE! SARAH: EXPERIMENTS GIVE US LABORATORY MODELS OF PRO- CESSES THAT HAPPEN IN THE REAL WORLD. AND AS BRENDON AND LAUREEN FOUND OUT, TECHNOLOGY AND DESIGN CAN HAVE A BIG INFLUENCE ON THE RESULTS OF YOUR EXPERI- MENT. DARREN: INSTEAD OF GASOLINE, PEOPLE USE FOOD AS A

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