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3 years ago

11

Describe how the design of a vacuum flask keeps the liquid inside hot ?

2 answers:

slavikrds [6]3 years ago

4 0

The gap between the two flasks<span> is partially evacuated of air, creating a near-</span>vacuum<span> which significantly reduces heat transfer by conduction or convection. </span>Vacuum flasks<span> are used domestically to </span>keep<span> beverages</span>hot<span> or cold.</span>

JulijaS [17]3 years ago

3 0

The gap between the two flasks is partially evacuated of air creating a near vacuum which significantly reduces heat transfer by conduction or convection

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Answer:

$C=2.32\times 10^{-4}\ Ns^2/m^2$

Explanation:

It is given that,

Mass of the golf ball, m = 46 g = 0.046 kg

Terminal speed of the ball, v = 44 m/s

The drag force, $F_r=Cv^2$

Where, C is the drag coefficient. At terminal speed, the weight of the ball is balanced by the drag force.

$Cv^2=mg$

$C=\dfrac{mg}{v^2}$

$C=\dfrac{0.046\times 9.8}{(44)^2}$

$C=2.32\times 10^{-4}\ Ns^2/m^2$

Hence, this is the required solution.

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