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Grade: 12th pass
        A lift of mass 100 kg starts moving from rests in the upward direction. Fig. shows the variation if speed of the lift T¬1, T2 and T3 stand for tension in the rope form zero to two seconds, two to six seconds, six to seven seconds respectively then:-
one year ago

Answers : (3)

Vikas TU
6869 Points
							
For each interval of time,
the slope is: 2, 0 and -4 respectively.
And the eqn. of motion is:
T =m(g+a) => 100*(g +a)
For first interval of time we have a = 2 m/s^2
Hence T1 = 100*12 = 1200 N
T2 = 100*g => 1000 N
T3 = 100*(g -4) => 600 N
Ratio of the Tensions are:
=> 6:5:3
one year ago
prateek
74 Points
							
answer is 6:5:7
for any other query plz contact........
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one year ago
Jagmeet
11 Points
							
For T1
T1=m(g+a)=100(10+2)=1200N
For T2 acc is zero because velocity is constant
T2=m(g+0)=100(10+0)=1000N
For T3 the lift is retarding therefore acc is -4
T3=m(g-4)=100(10-4)=600
Therefore the ratio of t1:t2:t3 is 6:5:3
4 months ago
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