Thermal Properties of Matter — Physics STD 11 Science — Question

When the size of a soap bubble is increased by pushing more air in it, the surface area increases. Does it mean that the average separation between the surface molecules is increased?

What is momentum and on which factors it depends?

A metal block of density 6000kg m^-3 and mass 1.2kg is suspended through a spring of spring constant 200N m^-1. The spring-block system is dipped in water kept in a vessel. The water has a mass of 260g and the block is at a height 40cm above the bottom of the vessel. If the support to the spring is broken, what will be the rise in the temperature of the water. Specific heat capacity of the block is 250Jkg^-1 K^-1 and that of water is 4200Jkg^-1 K^-1. Heat capacities of the vessel and the spring are negligible.

The two ends of a spring balance are pulled each by a force of 10kg wt. What will be the reading of the balance?

Read each statement below carefully and state with reasons, if it is true or false:
Each component of a vector is always a scalar,

Two astronauts on the surface of moon cannot talk to each other. Why?

Express a joule in terms of fundamental units.

How much should the speed of an object be increased so that its kinetic energy remains half of the initial kinetic energy?

Two artificial satellites, one close to the surface and other away are revolving around the earth. Which of them has larger speed?

Galileo was punished by the Church for teaching that the sun is stationary and the earth moves around it. His opponents held the view that the earth is stationary and the sun moves around it. If the absolute motion has no meaning, are the two, viewpoints not equally correct or equally wrong?