Questions
When a belt moves horizontally at a constant speed of 1.5 m/s, gravel is falling on it at 5kg/s, then the extra power needed to drive the belt is :
detailed solution
Correct option is A
GivenConstant speed v=1.5 m/sdmdt=5 kg/sFrom Newton’s law F=dpdt∵p=mv⇒F=dmvdt=v.dmdtF=vdmdt=1.5×5=7.5 NPower P=F×v=7.5×1.5=11.25 WTalk to our academic expert!
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A train is moving with velocity 20 m/sec. on this dust is falling at the rate of 50 kg/minute. The extra force required to move this train with constant velocity will be
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