% Error in volume V V . % Density = mass volume . Error in density = error in mass + error in volume - - - - Appendix . Calculate the number of times a human heart beats in the life of years old man.
Time of one heart beat = .8s. Solution: Life of the man = years years includes normal years and leap years Total no of days = × + × = 36524 days Number of seconds = 36524 × × = . x second Number of heart beats = Total no of Seconds Time period of heart beat = . s = .
× . The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is ′ . Calculate the distance of the heavenly body. [Given radius of the earth = 6400km] [ ″ = .
x - rad] Solution: Angle θ = = x ″ = ″ = × . × - rad θ = . × - rad; The distance of heavenly body D = d 12800 D = . × m Relative error lmean l Percentage error = % ( .
) . % . The shadow of a pole standing on a level ground is found to be m longer when the sun’s altitude is ° than when it was ° . Determine the height of the pole.
[Given = . ] Solution: Let the height of the pole be h. h ° ° m Solution x h cot ° h x ° cot h = cot60 ° h cot60 ° Substituting the values of