Mechanical Properties of Fluids — Physics STD 11 Science — Question

If the velocity of the center of mass of the particle system is zero, then will the velocities of its various particles necessarily be zero?

Can a photon be deflected by an electric field? By a magnetic field?

When we pull a wire, why do we have to do work? What happens to the energy given to the wire in this work?

Centre of mass of a triangular lamina is at the point of intersection of the is _______.

A vessel is filled with a mixture of two different gases. Will the mean kinetic energy per molecule of both the gases be equal?

Underline the correct alternative:
In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/ total linear momentum/ total energy of the system of two bodies.

What is the angle between frictional force and instantaneous velocity of the body moving over a rough surface?

The following example represent periodic motion :
An arrow released from a bow.

At what factor between the two particles gravitational force does not depend?

Why the temperature above 1200°C cannot be measured accurately by a platinum resistance thermometer?