Units and Measurements — Physics STD 11 Science — Question

Two particles A and B are moving along the same straight line. Bis ahead of A. Velocities remaining unchanged, what would be effect on the magnitude of relative velocity if A ahead of B?

What should be the value of Reynolds number for streamline fluid flow in a narrow tube?

What is the force equation of a SHM?

Gravitational force with which a body is attracted towards the centre of the earth is __________ of the body.

A cylindrical object of outer diameter 20cm and mass 2kg floats in water with its axis vertical. If it is slightly depressed and then released, find the time period of the resulting simple harmonic motion of the object.

Fig. depicts four x-t plots for linear motion of a particle. Which of the plots represent periodic motion? What is the period of motion (in case of periodic motion)?

Read each statement below carefully and state with reasons, if it is true or false: The average speed of a particle (defined as total path length divided by the time taken to cover the path) is either greater or equal to the magnitude of average velocity of the particle over the same interval of time.

Answer the following: Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet’s velocity in general. Yet the work done by the gravitational force over every complete orbit of the comet is zero. Why?

Chlorine and carbon dioxide gases are maintained at 27°C. Which gas will have higher average molar kinetic energy of translation and why?

What is the bulk modulus of a perfectly rigid body?