step by step physics problem solving

Assume unknown currents in a given circuit and show their directions by arrows. Choose any closed loop and find the algebraic sum of voltage drops plus the algebraic sum of the emfs in that closed loop and equate it to zero. Write equations for as many closed loops as the number of unknown ..

E s > E p i.e., K >1 N s > N..

Electric power is usually generated at places which are far from the places where it is consumed. Distribution of Electricity from Grid The power is transmitted over long distances at high voltage to minimize the loss of energy during transmission. For a given electric power, the current becomes lo..

In this type, the moving element is a very thin and flexible aluminum ribbon, upon which the sound waves act directly. It vibrates in a transverse magnetic field and generates an electromotive force on the ribbon. The ribbon impedance is so low that a small step-up transformer is include..

>An electrical device is used to change the AC voltage. A transformer which increases the AC voltage is called a 'step up transformer' and a transformer which decreases the AC voltage is called a 'step down transformer..

Pushes or Pulls are very general names given to forces. A physicist is much more precise when describing forces acting on a body using terms like weight, frictional force, tension, normal reaction force, electrical force, magnetic force etc. Any force could cause a change in the state of a body, in..

Photocopier moves a document from the handler to the glass plate, where the pattern of the image is projected by lamps, mirrors and lenses onto a photoreceptor belt (or drum). The electrostatic charge on the belt fades in areas receiving light from the projected image. Magnetic rollers brush the b..

Telephone Circuits - Two-way operation is essential for satisfactory telephone service, and many of the problems of the industry arise from this fact. A simplified circuit for obtaining two-way operation is shown in the below figure. This is called a local-battery system because a separat..

n - neutron U - 235 Uranium Ba - Barium Kr - Krypton E - Energy Note : The number of neutrons released in a uncontrolled chain reaction of U-235 nuclei is given by 3 n where n = 1,2,3,..... A Schematic Diagram Showing Essential Steps in a Chain Reaction Based on Fiss..

01. A man of mass 60 kg runs up a flight of 60 steps in 40 seconds. If each step is 20 cm high, calculate his power. Solution: Since the man runs up a flight of steps, the work done will be equal to the potential energy. Height = height of one step x number o..