- #1
Nexus99
- 103
- 9
- Homework Statement
- Determine power of the eninge
- Relevant Equations
- Upon a sloping roller and from a negligible height, sand is placed with a rhythm of dmdt. Thanks to an engine that provides a power W, the speed of the roller is kept constant (v0). The roller brings the sand up to a certain amount height, from which it then falls vertically with the initial velocity of magnitude v0 on a container placed at the base level of the roller, h lower. The container is placed upon a scale (see drawing). At a certain instant t, when the roller is already covered with sand and a mass M of sand has accumulated in the container, Determine:
1) the power provided by the engine W;
2) the momentum transferred to the sand by the scale in the unit of time dp/dt;
3) the weight indicated by the scale.
I'm really struggling with this problem. I can't understand which are the forces that i need to calculate work. Probabily when the sand falls the force of which i need to calculate work is weight force, but which is the force that carries the sand at the top of the roller?