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# Tag Archives: search terms

## 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

Answer:

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## 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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## 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?**

*(posted by Aditi)*

Answer:

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 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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## 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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## 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……

Please help and tell some tricks to solve these both…….

THANK U

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