Motion of System of Particles and Rigid Bodies — Physics STD 11 — Question

We consider a thermodynamic system. If ∆U represent the increase in its energy and W the work done by the system, which of the following statements is true?

A carnot engine operates with source at 127°C and sink at 27°C. If the source supplies 40 KJ of heat energy, the work done by the engine is

When two equal and opposite forces acting on the body at two different points, it may give –

When a source of sound is in motion towards a stationary observer, the effect observed is

If two vectors are having equal magnitude and same direction is known as –

Moment of inertia of a uniform solid sphere about an axis passing through the edge along its tangent is –

Moment of inertia of a thin uniform ring about an axis passing through the center and lying on the plane (along diameter) is –

For elastic collision, coefficient of restitution is

A box is dragged across a surface by a rope which makes an angle 45° with the horizontal. The tension in the rope is 100 N when the box is dragged 10 m. The work done is