Fig 3.1 shows a glass tube dipped into mercury

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

What are the applications of electromagnetic waves

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