a weightlifter has a basal metabolic rate of 71.5 w. as he is working out, his metabolic rate increases by about 650 w. (a) how many hours does it take him to work off a 450-calorie bagel if he stays in bed all day? 7.318 correct: your answer is correct. h (b) how long does it take him if he's working out? 0.2898 incorrect: your answer is incorrect. your response differs from the correct answer by more than 10%. double check your calculations. h (c) calculate the amount of mechanical work necessary to lift a 156-kg barbell 1.70 m.