Asemi-elliptical spring has ten leaves in all, with the two full length leaves extending 625 mm. it is 62.5 mm wide and 6.25 mm thick. design a helical spring with mean diameter of coil 100 mm which will have approximately the same induced stress and deflection for any load. the young's modulus for the material of the semi-elliptical spring may be taken as 200 kn/mm2 and modulus of rigidity for the material of helical spring is 80 kn/mm2

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?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?