Systems of Particles and Rotational Motion — Physics STD 11 Science — Question

Give the standard definition of 1 second of time

An object is moving in a plane in a direction different from the direction of its initial velocity. What will be the path covered by it?

How is the vibration of the air column in a flute different from that of a string in a sitar?

The brightness producing capacity of a source:

1. Does not depend on its power.
2. Does not depend on the wavelength emitted.
3. Depends on its power.
4. Depends on the wavelength emitted.

Answer the following: The casing of a rocket in flight burns up due to friction. At whose expense is the heat energy required for burning obtained? The rocket or the atmosphere?

Mark the correct statements:

1. Equations of special relativity are not applicable for small speeds.
2. Equations of special relativity are applicable for all speeds.
3. Nonrelativistic equations give exact result for small speeds.
4. Nonrelativistic equations never give exact result.

Why soap bubble bursts after some time?

When water changes into ice what is the effect on its valume and temperature?

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?