Physical World Units and Measurements - Result Question 47

48. The percentage errors in the measurement of mass and speed are 2 and 3 respectively. The error in kinetic energy obtained by measuring mass and speed will be [1995]

(a) 12

(b) 10

(c) 8

(d) 2

Show Answer

Answer:

Correct Answer: 48. (c)

Solution:

  1. (c) Percentage error in mass (Δmm×100)=2 and percentage error in speed (Δvv×100)=3.

Kinetic energy, k=12mv2.

∴ Error in measurement of kinetic energy ΔKK=Δmm+2(Δvv)

=(2100)+(2×3100)=8100=8

∴ age error =8.

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