Units and Measurements — Physics STD 11 Science — Question

The speed of light is 299,792,458m/s.

1. With respect to the earth.
2. With respect to the sun.
3. With respect to a train moving on the earth.
4. With respect to a spaceship going in outer space.

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
Work done by friction on a body sliding down an inclined plane.

A particle is executing S.H.M. Identify the positions of the particle where:

1. K.E. of the particle is zero.
2. P.E. is zero.
3. P.E. is one fourth of the total energy.
4. P.E. and K.E. are equal.

The force of attraction between earth and any object lying on or near its surface is known as ­­__________.

Should a thermometer bulb have large heat capacity or small heat capacity?

The speedometer of bus measures the average speed or of instantaneous speed?

Can the relative velocity of a moving body be zero with respect to another body? Give examples