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Home / Doubts and Solutions/NEET/Physics

ques no 3 and 4 with detail explanation

Asked by Kajalmandal64 27th September 2017, 10:19 AM
Answered by Expert
Answer:
3. Random error in the arithmetic mean reduces as more number of observations are repeated. Here the number of observations is increased 4 times, hence the error reduces to 1/3 times, that is, α/3.
 
4. 
begin mathsize 12px style Here space only space the space velocity space changes space and space the space mass space remains space the space same. Increase space in space velocity space equals space straight v over 10 Final space velocity space equals space straight v space plus space straight v over 10 space equals space fraction numerator 11 straight v over denominator 10 end fraction Initila space KE space equals space 1 half mv squared space and space Final space KE space equals space 1 half straight m open parentheses fraction numerator 11 straight v over denominator 10 end fraction close parentheses squared Change space in space KE space will space be space the space obtained space by space subrating space the space two space and space on space calculating space we space get space the space change space in space KE space as space 21 percent sign end style
Answered by Expert 28th September 2017, 10:22 AM
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