In the figure, the lever arm, l, is distance r from the hinge to the point at which you exert your force. The torque is the product of the magnitude of the perpendicular force multiplied by the lever arm.
Children normally need a certain number of calories each day (energy allowance) that their bodies use as energy for normal daily activities (walking, breathing, etc.). This ranges for boys from 2000 calories for a 7-10 year old, 2500 calories for an 11-14 year old, and 3000 calories for a 15-18 year old. For girls the ranges are from 2000 calories for a 7-10 year old, to 2200 calories for an 11-18 year old. These are only estimates and some children need more (fast metabolism) or less (slow metabolism) of an energy allowance for daily activities.
Kids need plenty of calories on a daily basis to grow and develop properly -- but children who eat too many calories, especially those who are inactive, are at risk for childhood obesity. Your childâs individualized calorie needs are based on age, gender and activity level.ctive 4- to 8-year-old children need more calories than their inactive counterparts. For example, girls ages 4 to 8 often need 1,200 calories daily if they are sedentary, 1,400 to 1,600 calories if they are moderately active and 1,400 to 1,800 calories a day if they are regularly active.