A wheel of radius `r` and mass `m` stands in front of a step of height `h`. The least horizontal force which should be applied to the axle of the wheel to allow it to raise onto the step is

A wheel of radius R and mass M is placed at the bottom of a fixed step of height R as shown in the figure. A constant force is continuously applied on the surface of the wheel so that it just clims the step without slipping. Consider the torque tau about an axis normal to the plane of the paper passing through the point Q. Which of the following options is/are correct?

A wheel of radius R and mass M is placed at the bottom of a fixed step of height R as shown in the figure. A constant force is continuously applied on the surface of the wheel so that it just climbs the step without slipping. Consider the torque tau about an axis normal to the plane of the paper passing through the point Q. Which of the following options is/are correct?

A heavy wheel of radius 20 cm and weight 10 kg is to be dragged over a step of height 10 cm , by a horizontal force F applied at the centre of the wheel. The minimum value of F is

A roller of mass 300kg and of radius 50cm lying on horizontal floor is resting against a step of height 20cm . The minimum horizontal force to be applied on the roller passing through its centre to turn the roller on to the step is

The minimum horizontal force applied to the centre of wheel of radius R and weight w to pull it over a step of height R//2

The minimum horizontal force applied to the centre of wheel of radius R and weight w to pull it over a step of height R//2