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Engineering
An object having mass = 2kg  experience a force F= 2t^{2}i in x-direction. Find work done by the force in the first 3 sec.

An object having mass = 2kg  experience a forceF= 2t^{2}\widehat{i} in x - direction. Find work done by force in first 3 sec.

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A Abhishek Sahu
Given,  m = 2 kg F  = 2t^2 i a = F/m =  2t^2/2 = t^2 i Assuming initial velocity was zero, u = 0 We know that, dw = F.dx Put t = 3 secs W = 81 J  
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Engineering
A body is projected upwards under gravity with a speed of 15.3m/s. The maximum height which can be reached is1. 9.1m2. 21.8m3. 11.9m

 

4. 15.8m
 

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A Abhishek Sahu
Maximum height will be attained when the final velocity will become zero.
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Engineering
A rectangular coil of single turn, having area A, rotates in a uniform magnetic field B with an angular velocity omega about

15506823947031525114993.jpgA rectangular coil of single turn, having area A, rotates in a uniform magnetic field B with an angular velocity \omega about an axis perpendicular to the field. If initially the plane of the coil is perpendicular to the field, then the average induced emf when it has rotated through 900 is

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A Avinash Dongre
  and   
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