(c) An 8-ounce (mass) broiled sirloin steak containing 414 food calories. Ans. (a) 4441.5 Btu/lbm, (b) 12267 Btu/lbm, (c) 3283.5 Btu/lbm 1.5: Playing singles tennis for an hour results in the "burning" of 428 food calories. How many minutes of operation of a 500-watt blow dryer are equivalent to the food energy used in playing tennis for an hour? One food calorie (or large calorie) is equivalent to 4184 joules. Ans. 59.7 min Q Search hp M W mvolgor