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