Gravitation — Physics STD 11 Science — Question

Which of the following length measurement is most accurate and why?

1. 4.00cm.
2. 0.004mm.
3. 40.00cm.

Two masses each of 100kg are separated by 1 metre. Find the gravitational (i) field (ii) potential at the mid-point of the line joining them.

The fundamental frequency of a closed pipe is 293Hz when the air in it is at a temperature of 20^°C. What will be its fundamental frequency when the temperature changes to 22^°C?

A tightly-wound, long solenoid has n turns per unit length, a radius r and carries a current i. A particle having charge q and mass m is projected from a point on the axis in a direction perpendicular to the axis. What can be the maximum speed for which the particle does not strike the solenoid ?

The refractive index of a material changes by 0.014 as the colour of the light changes from red to violet. A rectangular slab of height 2.00cm made of this material is placed on a newspaper. When viewed normally in yellow light, the letters appear 1.32cm below the top surface of the slab. Calculate the dispersive power of the material.

An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?

Explain the difference between uniform velocity and variable velocity.

Why is the sphere taken to be spherical to make a simple pendulum?

If Length, Time and Energy are fundamental units, find the dimension of mass.