Question ID - 99691 | SaraNextGen Top Answer
Ram and Ali have been fast friends since childhood. Ali neglected studies and now has no means to earn money other than a camel whereas Ram has becomes an engineer. Now both are working in the same factory. Ali uses camel to transport the load within the factory
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Due to low salary and degradation in health of camel, Ali becomes worried and meets his friend Ram and discusses his problem. Ram collected some data and with some assumptions concluded the following
i.The load used in each trip is 1000 kg and has friction coefficient 
and 
ii.Mass of camel is 500 kg
iii.Load is accelerated for first 50 m with constant acceleration, then it is pulled at a constant speed of 
for 2 km and at last stopped with constant retardation in 50 m
iv.From biological data, the rate of consumption of energy of camel can be expressed as 
where 
is the power and 
is the velocity of the camel. After calculation on different issues, Ram suggested proper food, speed of camel, etc. to his friend. For the welfare of Ali, Ram wrote a letter to the management to increase his salary
(Assuming that the camel exerts a horizontal force on the load):
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Sign of work done by the camel on the load during parts of motion: acceleration motion, uniform motion and retarded motion, respectively are |
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a) |
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b) |
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c) |
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d) |
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(a) i.During accelerated motion, negative work is done against friction and there is also change in kinetic energy. Hence, net work needed is positive ii.During uniform motion, work is done against friction only and that is positive iii.During retarted motion, the load has to be stopped in exactly 50 m. If only friction is considered, then the load stops in 12.5 m which is less than where it has to stop. Hence, the camel has to apply some force so that the load stops in 50 m (>12.5 m). therefore, the work done in this case is also positive |
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