Which statement about the accuracy and precision of measuring tools is

1 answer:

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The true statement about the accuracy and precision of measuring tools is Tools cannot be both accurate and precise. The correct option is C.

<h3>What is accuracy?</h3>

When in an experiment, a value is measured 5 times, then if the values measured are same for most of the time or like three times out of five, it said to be accurate. The phenomenon is accuracy.

Precision is about comparing the values to each other then find them near to each other.

Accuracy compares the experimental value to the theoretical value.

So, when all the values are close to each other but not nearest to the theoretical value, then it is said to be precise but not accurate.

Thus, the correct option is C.

Learn more about accuracy.

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11) A tank of kerosene with density of 750 kg/m3 has a syphon used to remove the fluid that then exits into the local atmosphere

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Answer:

$7.32\ \text{m/s}$

Explanation:

$v_1$ = Velocity at initial point = 0

$P_1$ = Pressure in tank = 120 kPa

$P_2$ = Pressure at outlet = 101 kPa

$\rho$ = Density of kerosene = $750\ \text{kg/m}^3$

$Z_1$ = Tank height = 15 cm

$Z_2$ = Height of pipe exit = 0

$g$ = Acceleration due to gravity = $9.81\ \text{m/s}^2$

From Bernoulli's equation we have

$\dfrac{P_1}{\rho g}+\dfrac{v_1^2}{2g}+Z_1=\dfrac{P_2}{\rho g}+\dfrac{v_2^2}{2g}+Z_2\\\Rightarrow \dfrac{P_1}{\rho g}+Z_1=\dfrac{P_2}{\rho g}+\dfrac{v_2^2}{2g}\\\Rightarrow v_2=\sqrt{2g(\dfrac{P_1}{\rho g}+Z_1-\dfrac{P_2}{\rho g})}\\\Rightarrow v_2=\sqrt{2\times 9.81(\dfrac{120\times 10^3}{750\times 9.81}+0.15-\dfrac{101\times 10^3}{750\times 9.81})}\\\Rightarrow v_2=7.32\ \text{m/s}$