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why in all the system of units time is always in second?
Please tell me why in all the system of units time is always in second? -Pankaj Sharma
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Sequence of Learning Physics
In what sequence should these chapters be prepared for my exams:-
units and dimensions,kinematics,laws of motion,work power and energy,motion of system of particles and rigid body dynamics,gravitation.
Apoorv Katoch asked
Answer:
It is better to follow the same pattern as given in NCERT text book
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Cable transmission of signals
HS Varun asked:
How is it possible to transmit a no. of channels through the same cable ?
Is it based on the concept of Bandwidth ?
Answer:
In a cable TV system, each channel is assigned a range of frequency (6-8MHz range)
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A Question from Electromagnetic Waves
Rajat asked: –
we know that electric and magnetic field are associated with charged particle but when light travells,it produces electric and magnetic field both but it consests of photons,which is a uncharged particle.why it did so?
Master will soon answer this.
By the time, if any visitor wants to answer, please use the commenting system
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Numerical from centre of mass
Two skaters, one with Mass 45kg, 2’nd with Mass of 65kg stand on an ice rink holding a pole with L=10m with negligible mass. starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 45kg skater move?
Hint: They will meet at the centre of mass of the system.
If the 45 kg skater moves by x m, then the second one travels (10-x)m
then,
45 x = 65(10-x)
Solve and get the value for x
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Conservation of Angular Momentum and Kinetic Energy
Imagine a rod 2 meters long fixed at its center, 2 identical masses are placed 0.5 meters away on opposite sides , as the rod spins they slide towards the edges , according to the formula k.E.=0.5*I*ω2 the kinetic energy decreases , but since its a closed system why does the kinetic energy decrease ?
Answer:
The decrease in KE accounted by the work done in displacing the masses
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Centre of mass of an accelerated body
“What is the effect on centre of mass of system of particles when it is placed in accelerated train?” Vimal asked
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Physics Masters
Vivek Sawhney
AskPhysics Q&A
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