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acceleration is 2m/s<strike>2</strike> what is the distance travelled in 5th half second.

Posted by Vandana Hemasai 7 years, 8 months ago

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<pre> a uniform wire of resistance of 20ohm having resistance 1 ohm/m is bent to form circle. if the equivalent resistance is 1.8ohm the length of shorter is what.</pre>

Posted by Pankaj Srivastava 7 years, 9 months ago

Entrance Exam > NEET-UG > Physics

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A train passes an electric post in 10 sec. and a bridge of length 2km. in 110 second. what is the speed of the engine?

Posted by Ramesh Kumar Tiwari 7 years, 9 months ago

Entrance Exam > NEET-UG > Physics

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Naveen Sharma 7 years, 9 months ago

Ans. Let Length of Train = x meter

Time taken to cover post = 10 sec

if a train pass post. it mean it is covering distance equal to its length

So speed = ${distance \over time } = {x\over 10} \ .... (1)$

Again if it pass a bridge it cover distance equal to sum of length of bridge and length of train.
Length of Bridge = 2 Km = 2000 m

So distance covered = ( 2000 + x ) m
Time taken = 110 sec
So Speed = ${2000+x\over 110 } \ ........... (2)$

From (1) and (2), we get

$=> {x\over 10}={2000+x\over 110}$

=> 110 x = 20000 + 10 x

=> 100x = 20000

=> x = ${20000\over 100} = 200 \ m/s$

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A carnot engine working between 400k and 800k has a work output of 1200 joule per cycle what is the amount of heat energy supplied to the engine from the source per cycle

Posted by Rohit Poria 7 years, 10 months ago

Entrance Exam > NEET-UG > Physics

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Gaurav Bhardwaj 7 years, 10 months ago

First find efficiency of engine = 1- lower temperature/higher temperature = 1/2 then amount of heat energy is two times of work done = 2400 joule

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Question 1-the resultant of two vectors of magnitude p and 2P is perpendicular to the first <a href="https://www.embibe.com/learn/mathematics/chapter-vector-412">vector</a>. find the <a href="https://www.embibe.com/learn/physics/concept-angle-9428">angle</a> between the resultant and second vector

Question 2 - A cart is with moving East speed 1 metre per second A man is walking on this cart with a velocity 2 metre per second with respect to the cart while he moves he swings his left hand with a speed 4 metre per second due West with respect to him. a fly sitting on the man's hand moves with a velocity 6 metre per second due South with respect to the hand .find the velocity of the fly as seen by a ground observer

Question 3 -As the angle between two forces of fixed magnitude is varied the greatest and the least value of resultant of two forces are 20 Newtons and 10 Newtons respectively. find the magnitude of the forces

Posted by Shankhaneel Ghosh 7 years, 10 months ago

Entrance Exam > NEET-UG > Physics