PHYSICS

The equation of continuity is area of cross-section of flow of water × velocity of water = constant. Hence  the velocity of water is inversely proportional to the the area of cross-section of water flowing. When water runs deep then the area of cross section of the flowing water is more than when its shallow so the velocity is less for deep water.

Sublimation is a process of transformation of state of matter where a solid changes directly into its gaseous state. The molecules in some solids have very weak force of attraction. So the molecules by gaining very little heat from the surrounding can change into gaseous particles.

Specific resistance or resistivity is the resistance of a wire of unit length and unit area of cross-section. It depends on two factors. 1. Nature of the substance. 2.  Temperature of the substance It is not effected by 1. Length of the wire. 2. Area of cross-section of the wire. So., when you stretch a  wire its RESISTIVITY remains constant.

A solenoid is a cylindrical/helical coil whose length is more than its diameter. When we pass current through the solenoid , a magnetic field is set up in the space around the solenoid similar to that of a bar magnet. There is ,in fact, a strong and uniform field in the core of the solenoid.At the two ends of the solenoid, poles are developed as in a bar magnet. So the current carrying solenoid if freely can show the direction of the magnetic field of a magnet.The north end of the magnet shows the geographic north and South end shows south .

The electric power is generated at 11,000V at a power station. It is then transformed to 1,32,000V using a step up transformer. For a given electric power, when voltage increases, the electric current decreases as P=VI or I=P/V. Hence , at high voltage low current is involved. As current decreases, the power loss(I in the transmission lines decreases in the form of heat . To reduce this loss, high voltage is preferred

The earth has two types of motion. 1.Revolution around the sun 2. The rotation about it's own axis. The earth rotates about it's own axis from west to east, so sun appears to rise from east direction.

theloveforphysics Water has higher specific heat capacity* than that of land(sand) due to which water is heated at slower rate than the land. As the land is heated, the hot air above the land rises up  creating low pressure above the land. As the air above water is comparatively cooler than the air above the land , this air moves towards the land due to the pressure difference. This cool breeze blowing towards the land from sea is called sea breeze. As heating is required for its formation,  sea breeze blows during day time. * Specific heat capacity is the amount of heat required to raise the temperature of unit mass of a substance by 1 K or 1°C.