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Catalogs Discussion Forums -> Mechanics -> Min value of u -> Go to message
This Post 10 points    (Olaaa!! Perrrfect answer.   in 2 votes )   [?]

I solved this problem and is a little lengthy. I am getting  

I will send you complete solution later on.

 

Catalogs Discussion Forums -> Mechanics -> Min value of u -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Your answer is 

Catalogs Discussion Forums -> Mechanics -> Chain -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]

 This is easy to solve. Let the initial and final position of COM of the system from pulley are Yc0 and Yc1 which can be found to be : 

Applying conservation of energy:

Solving above above equation for v:

we get:

 

 

 

 

 

 

 

 

 

Catalogs Discussion Forums -> Mechanics -> Cirular motion -> Go to message
This Post 10 points    (Olaaa!! Perrrfect answer.   in 2 votes )   [?]

 Let velocity at when it is moving verticle is v,

.......................................(1)

Hence 

Normal component of accn is given by 

Tangential Component= g

Hence resultant accn is  

Catalogs Discussion Forums -> Electricity -> L-C -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]

 When energy stored in inductor is maximum , at that time energy stored in capacitor is zero and vice versa, hence

Hence 

Catalogs Discussion Forums -> Mechanics -> mechanical properties of solids -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 

 Put values of Delta L/L= 2% , you will get answer

Catalogs Discussion Forums -> Mechanics -> the two ends of a train moving with a constant acceleration pass a certain point with velo -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Let engine of the train passes the point with velocity v and its end passes the same point with velocity u. Length of the train is L.

 ...............................(1)

Let mid point passes with velocity Vm :

 ...................(2)

Eliminate L from (1) and (2)

Catalogs Discussion Forums -> Mechanics -> MECHANICS -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Let deceleration when going up is a1 and acceleration when coming downward a2

 


Let the block is thrown upward with velocity v, and distance travelled upward is s

.......................(1)  when going upward.

           .........................(2)

.................................................(3)

t2=2t1  

Implies that  

Put value of a2 and a1 we get

  = 0.16

Catalogs Discussion Forums -> Mechanics -> rotational motion question -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Let us apply priciple of conservation of energy.

  ...................(1)               where m1 is mass of cylinder when radius is r/2 and Ic is moment of Inertia about an axis passing through point of contact.

m1= m/4


Now put m1 and Ic in equation (1) and find     w

Then V=wr/2  you will get:

       Ans

 

Catalogs Discussion Forums -> Magnetism -> solenoid -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]

 V=LdI/dt +IR

Solve above equation for I

where E is magnetic energy at any intant t

  where Em is max energy and Im is max current

Hence E= Em/4

 

 

Catalogs Discussion Forums -> Mechanics -> Most Confusing Part. -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Engineering Mechanics by Bear n Jonson

Catalogs Discussion Forums -> Mechanics -> a simple que........ -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Ha/Hb=a2/a1       where a1 decceleration of A and a2 is that of B

Since a2<a1

Hence Hb>Ha

Ans is C

Catalogs Discussion Forums -> Mechanics -> a simple que........ -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Mass B will go higher than A

Catalogs Discussion Forums -> Mechanics -> work energy and power -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Force inversely proportion to the square root of time

    where k is a constant and m is mass

Catalogs Discussion Forums -> Mechanics -> motion -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 The resultant velocity of end B is along a direction perpendicular to the rod. Since block is moving in horizontal direct with contstant velocity, hence  

Catalogs Discussion Forums -> Mechanics -> gravitation -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Miss Shivani 

Its my wise advice to you to kindly first develop fundamentals. You must be able to solve such simple problems on your own.

Catalogs Discussion Forums -> Mechanics -> gravitation -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 At Earth surface:


At height h:


From above equation we find             h=3R

Catalogs Discussion Forums -> Mechanics -> SHM -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 

Catalogs Discussion Forums -> Mechanics -> mechanics -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Linear velocity V=wR

E1  = 

Total KE= E2  = 0.5( )       where R is radius of ball(not radius of gayration)

E1/E2    / ()  = 

 

Total Energy=

Catalogs Discussion Forums -> Mechanics -> mechanics -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

 Since all forces are internal , hence apply conservation of linear momentum on center of mass.

Let mass of the whole system is m

m(0)= mv

v=0 where v is velocity of COM

 

 

 

 

 

 

 

 

 

 
 
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