Explain :

Asked by shuchi.saumya | 28th Oct, 2010, 09:51: PM

Expert Answer:

Dear Student,

Figure for indicative purpose only; not to scale.

initial velocity =0, frictional force =0.  

Let Pullng force = F. Acceleration = a = 1 m/s2

Along the incline :

F = mg sin 30 + ma

   = 9.8 + 2 = 11.8 N

 

let v = velocity after 4 seconds

v = at = 4 m/s      

 

s = distance in 4 seconds

   = 1/2 at2 = 8 m.

 

Power at t=4 s

P = F . v = 11.8 * 4 = 47.2 W

 

Work done in 4 seconds = W = F * s = 11.8 * 8

Average power = Pa = W/t = 23.6 W

We hope that clarifies your query.
Regards
Team
Topperlearning

Answered by  | 3rd Nov, 2010, 03:19: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.