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Why do we used steel alinico for making permanent magnet?
πThe materials which we choose in making of a permanent magnet should have high coer…
Why do planets change their speeds when orbiting around the Sun ?
According to Kepler's second law which states that the areal velocity of a planet…
A 40 kg block is resting at a height of 5 m off the ground. If the block is released and falls to the ground, what is its total energy at a height of 2m (g=10m/s²)?
For such questions we have to use the idea of conservation of energy, i.e. total ene…
If a boy drops a ball from a window and the ball takes 3s to hit the ground, what is its velocity the second before it hits the ground? Take gravity as 10m/s^2 . (Neglect air resistance)
From given conditions we observe that, ball takes 3s to hit the ground, then one seco…
A wheel is rotating at 20rad/s is brought to rest by a constant torque in 4 seconds. If the moment of inertia of the wheel is 0.3 kgm^2, what is the angle rotated by the wheel in the first 2 seconds?
Given conditions can be written as, Ο1 = 20 rad/s I = 0.3 kgm 2 t = 4 s ∵ Ο2 = Ο1 1 -…
A monkey climbs a 60 m high pole. In the first minute, he climbs 6 m and slips down 3 m in the next minute. What time is required for it to reach the top?
From the given conditions we find that , In the first minute the monkey climbs 6 met…
A car is moving on a straight road covers one third of the total distance at 20km/h, and the rest at 60km/h. What is its average speed?
To solve such sums let us assume some quantities first . L et the total distance cove…
Postulates of Kinetic Theory of Gases
π A gas consists of large number of tiny particles called molecules. Volume occupied …
Why we need assumptions while we study the behaviour of a gas
For any solid object its motion can be described well with the help of Newton's …
Important Tips While Learning Magnetic Effect Of Electric Current
Tips for understanding magnetic effects easily A magnetic needle kept in a uniform ma…
Few Tips Class 12 students from Semiconductor Chapter
SEMICONDUCTOR MATERIALS & PROPERTIES 1. A pure semiconductor has negative tempe…
What are Paramagnetic substances, its properties & its examples
What are Paramagnetic substances A material which is weakly attracted by a magnet and …
What are Diamagnetic Substances , give some examples of it
What are Diamagnetic Substances A material which is weakly repelled by a magnet and wh…
Hydrogen Atom Spectra
Basically hydrogen atoms gives few spectral lines when they are ionized. The set of …
Faraday's Law of induction
Faraday's First Law Whenever there is a change of magnetic flux in a closed circui…
Hot water when poured in glass beaker, the beaker cracks ...Why
+When hot water is poured in a glass beaker the inner surface of the glass expands on …
Why specific heat capacity of a gas at constant pressure is greater than specific heat capacity at constant volume
πWhen the gas is heated at constant volume there is no work done against external pre…
Why minimum two stage rocket is needed for launching a satellite
Why minimum two stage rocket is needed # For the projection of an artificial satellit…
Polar Satellite
Short Idea About Polar Satellite Polar Satellites are placed in lower polar orbits. Th…
Characteristics of an IDEAL FLUID
An ideal fluid has the following properties πIt is incompressible, i.e., its density …
Lens Equation Calculator
π Lens Formula Calculator Enter any two quantities and the …
A simple pendulum of length 100 cm performs S.H.M. Find the restoring force acting on its bob of mass 50 g when the displacement from the mean position is 3 cm.
The data that we can put forward from this question is , Length L= 100cm …