Category Archive: Physics Homework

Oct 10

Motion in a vertical circle and conservation of energy

A stone  tied to a string of length l is whirled around a vertical circle with the other end of the string at the centre. At a certain instant of time the stone is at the lowest position and has a

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Sep 14

Jaz posted this question from electrostatics

“I’ve tried so many times, but I’m unable to arrive at the correct equation; See attachment for question” Question   Jaz posted this question E=k(2λ/r) due to positive wire E’=k(2λ/(D-r)) due to negative wire The r...

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Sep 13

A Physics homework problem based on projectile motion and reaction time

A missile is launched and travels at 309m/s. If the operator discovers that the missile is locked on the wrong target and must be detonated by remote signal before impact, how far will the missile travel if the operator’s reaction time to send...

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Aug 31

A problem from Projectile motion

If maximum height attained by a body projected vertically upward is equal to two times magnitude of acceleration , then its time of flight is ………. ? (Divya posted) Answer: If you take g=10 m/s2 then H=20m At max height, v=0 H=vt- 0....

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Aug 31

Question from Relative velocity

The distance between two cars decrease by 20m in 2s when they travel in opposite direction , and distance decrease by 1m in 1s when they travel in same direction. the speeds of cars are ………. ? (Divya posted this question)

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Aug 31

A question from velocity time graph

if graph of velocity v and time t for a particle moving along straight line is parabola symmetric about time axis, then the relation between acceleration a and time t for particle is …. ? (Divya posted this question)

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Aug 30

Define Momentum

Momentum is defined as the quantity of motion. Only moving bodies possess momentum. It is a vector quantity and its direction is same as that of velocity. Momentum is measured as the product of mass and velocity. Momentum of a body is a measure of the ...

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