2. Uma partícula de 3 kg parte do repouso em x=0 e se move sob a acção de uma única força (SI). Calcule a) o trabalho da força quando a partícula se desloca de x= 0 até x = 3m b)a potência proporcionada à partícula no ponto x

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?