3 years ago

All measurements have some degree of uncertainty. True False

Chemistry

2 answers:

SVETLANKA909090 [29]3 years ago

8 0

Answer:

true

Explanation:

vazorg [7]3 years ago

4 0

True. All measurements are to some decree uncertain, as one cannot know for sure that the measured value is that exact value, even if you using a device that gives very precise measurements to the greatest number of significant figures.

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Saturated liquid water flows steadily into a well-insulated electrical water heater (see Anim. 4-1-1) with a mass flow rate (m⋅)

Otrada [13]

Answer:

a. 2257.7 kW b. 6.057kw/K

Explanation:

Steam existing at 100KPa with t = 20C, we can obtain values of enthalpy and entropy from table

h1 = hf = 417.4 kJ/kg

s1 = 1.302 KJ/kg.K

h2 = hg = 2675.1 kJ/kg

s2 = 7.359 kJ/K

a. Electrical Power consumption of system is given by Wel = mass x Change in Enthalpy

Wel = 1 x (h2 - h1) = 1 x (2675.1 - 417.4) = 2257.7 kw

b . Entropy Generation is given by Change in Entropy = Entropy generation - heat dissipated/temperature, since we have a well insulated system with no losses, q =0, hence

ΔS = Sgen + 0/T = Sgen

m(S2 - S1) = Sgen

Sgen = 1 x (7.359 - 1.302) = 6.057 kW/K

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3 years ago

Can you give an example of a dramatic climate change that could occur in the near future?

Ivanshal [37]

A Ice age could occur in the near future causing a mass extinction this is due to global warming.

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3 years ago

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