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## Problem from relative velocity

A Boat covers certain distance between two spots in a river taking t1 hrs going downstream and t2 hrs going upstream. What time will be taken by boat to cover same distance in still water?
posted by STUTI ## How can we define one Newton ?

How can we define one Newton? (Asked Pawas Rituja)

One newton is defined as that force which when acts on a body of mass 1 kg produces an acceleration of 1 m/s^2 in it

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• Science cbsc Question paper of sa 1(2011-12) of class8 Science ## A simple numerical on momentum

Car mass is 1200 kg moving velocity is 108 km/hr. On applying brakes velocity reduced to 36 km/hr. Find change in momentum?

m=1200 kg

u=108 x 5/18=30m/s

v=36×5/18=10m/s

Change in momentum = m(v-u) = 1200 x (30-10)=1200 x 20= 24000 kg m/s

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• numerical physics ## Numerical Problem from Motion of Connected systems

Two blocks A and B of mass m1 and m2 respectively are kept in contact on a frictionless table.The experimenter pushes the block A from behind so that the blocks accelerate. If  the block A exerts a force F on the block B,what is the force exerted by the experimenter on A.

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• numericals on connected motion in pdf file ## Solution to HC Verma Problem

“Referring to HC Verma Part 2, chapter 29, Electric field and potential, Q 69
I think that Force is inversely proportional to square of the distance between the charged particles, so acceleration is not constant and hence
v*v  =  u*u  + 2*a*s   is not valid in this case.
How is proceed with this question ?” Satyam asked

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• Physic numerical solved HC VERMA ## Solving problems from kinematics and friction

I just want to know how to easily solve problems related to kinematics and friction. I don’t know why i always face problem in these two topics a lot……
THANK U

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• resolve kinematics ## Direction of magnetic field due to a current carrying conductor

“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil

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