Answer to Question #160842 in Physics for Andu

Question

3. The body weighing 2.5kg is hung on the hook of a dynamometer. Find: a) The weight of the body when the body and the dynamometer are at rest. b) Body weight when together with the dynamometer they climb up with an acceleration of 5m / s²

Answer 1

a)

$$W=mg=2.5\ kg\cdot9.8\ \dfrac{m}{s^2}=24.5\ N.$$

b)

$$N-mg=ma,$$ $$N=m(g+a)=2.5\ kg\cdot(9.8\ \dfrac{m}{s^2}+5.0\ \dfrac{m}{s^2})=37\ N.$$