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.
Calories for Weight Gain. Healthy children ages 2 to 3 years need about 1,000 calories per day, and children ages 4 to 8 years need 1,200 to 1,400 calories each day.In order to gain 1 pound, an individual must eat an additional 3,500 calories.By adding an extra 500 calories to your childâs calorie needs each day, this will help him gain roughly 1 pound of weight per week, which is considered appropriate for children who are underweight.ncreasing Calories from Beverages. If your child is not a big eater, you can also help her gain weight by increasing the calories that she gets from drinks. One-hundred percent fruit juices, whole and 2 percent milk and yogurt-based smoothies all contain over 100 calories in a single, 8-ounce serving.