Por ejemplo, si una persona de 70 kg come mucho helado y pastel, que le aportan 5,0 x〖10〗^5 cal y desea compensar este valor, debe hacer una cantidad de ejercicio. Si para esto sube escaleras, y por cada escalón quema 28 J de energía, entonces, ¿cuántos escalones debe subir para quemar las calorías consumidas? ayuda por favor

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c