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.
The Institute of Medicineâs recommendation is that kids ages 4 and older get 25 to 35 percent of their daily calories from fat. For example, girls eating 1,500 calories a day should aim for 42 to 58 grams of fat, while boys consuming 1,600 calories a day need 44 to 62 grams of fat daily.or example, girls eating 1,500 calories a day should aim for 42 to 58 grams of fat, while boys consuming 1,600 calories a day need 44 to 62 grams of fat daily.