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What is amber in Physics?

In Physics, amber is a petrified tree resin. According to Greeks, when an amber is rubbed against a rod along with a piece of cloth, the amber... View Article

A train starts from rest and moves with a constant acceleration of 2.0 m/s² for half a minute. The brakes are then applied and the train comes to rest in one minute. Find (a) the total distance moved by train, (b) the maximum speed attained by the train and (c) the position(s) of the train at half the maximum speed. Concept of Physics – 1 , HC VERMA , Chapter “Rest and Motion : Kinematics

Train starts from rest, hence the initial velocity u = 0. It moves with acceleration = 2m/s2 for half minute (30 seconds). Distance covered in... View Article

Five advantages and disadvantages of water transport

The following are the advantages of water transport: The maintenance cost is less. It is comparitively less expensive that the rail and road... View Article

Match the following : (i) Land breeze blows during (a) summer (ii) Sea breeze blows during (b) winter (iii) Dark coloured clothes are preferred during (c) day (iv) Light coloured clothes are preferred during (d) night

The answer is: i. The land breeze blows during (d) night ii. The sea breeze blows during (c) day iii. Dark coloured clothes are preferred... View Article

A bird sitting on a high power electric line is still safe. How? briefly

Birds don't get shocked when they sit on the electrical wires because they are not a good conductors of electricity. Since there is no difference... View Article

Define electric current. Give its SI unit and formula .

Electric current is defined the flow of electric charge in a conductor. The SI unit of electric current is Ampere. The formula of electric... View Article

A particle is moving in a circular path of radius r, its displacement after half a circle would be a) 2r b) πr c) d) 2πr e) 0

Answer: a) 2r The movement of a body following a circular path is called a circular motion. The total distance measured between the start and... View Article

why is a voltmeter connected in parallel with circuit element i.e resistor across which voltage is to be measured

A voltmeter connected in parallel with circuit element, i.e. resistor across which voltage is to be measured because elements in series have the... View Article

The dimensional formula of magnetic flux is

The dimensional formula of magnetic flux is M1L2T-2I-1.... View Article

The substance that helps to —- friction are called lubricants. (a) increase (b) reduce (c) create (d) none of these

The substance that helps to reduce friction are called lubricants. Option b is the answer.... View Article

Calculate the least count of the screw gauge

The least count of the screw guage is defined as the distance moved by the tip of the screw when turned through one division of the head scale.... View Article

A full length image of a distant tall building can definitely beseen by using

A full length image of a distant tall building can definitely be seen by using a convex mirror.... View Article

Derive the second equation of motion by graphical method

Derivation of second equation of motion by graphical method: From the graph above, we can say that Distance travelled (s) = Area of figure... View Article

The dimensional formula of electric potential is given by

The dimensional formula of electric potential is given by ML2T-3A-1. Electric potential = work/charge.... View Article

A uniform chain of length L and mass M is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is the acceleration due to gravity, the work required to pull the hanging part on to the table is

Solution: Consider, the weight of hanging part (L/3) of chain = Mg/3 This weight acts at the centre of gravity of the hanging part, which is... View Article

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