3 years ago

If you mix water that is 80° with the same amount of water that is 20° what will the resulting temperature be

Physics

1 answer:

olga55 [171]3 years ago

5 0

Answer:

Explanation:

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Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The inter

Dafna1 [17]

Answer:

The velocity at exit of the nozzle is 175.8 m/s

Solution:

As per the question:

Air density inside the rocket, $\rho_{i} = 5.25\ kg/m^{3}$

Speed, v = 1.20 m/s

The inner diameter of the rocket, $d_{i} = 15.0\ cm = 0.15\ m$

The inner radius of the rocket, $r_{i} = \frac{0.15}{2} = 0.075\ m$

The exit diameter of the nozzle, $d_{e} = 2.50\ cm = 0.025\ m$

The exit radius of the nozzle, $r_{e} = 0.0125\ m$

Air density inside the nozzle, $\rho_{n} = 1.29\kg/m^{3}$

Now,

To calculate the air speed when it leaves the nozzle:

Mass rate in the interior of the rocket, $\frac{dM}{dt} = \rho_{i}Av$

Mass rate in the outlet of the nozzle, $\frac{dm}{dt} = \rho_{n}A'v'$

Now,

$A = \rho_{i}r_{i}^{2}$

Now,

We know that:

$Av = A'v'$

$\rho_{i}r_{i}^{2}v = \rho_{n}r_{e}^{2}v'$

$5.25\times 0.075^{2}\times 1.2 = 1.29\times 0.0125^{2}v'$

v' = 175.8 m/s

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3 years ago

A ball is thrown vertically upwards. It returns 6s later. Calculate : (1) the greatest height reached by the ball, and (2) the i

dsp73

Answer:

greatest displacement = 44.1m

initial velocity= 29.4m/s

Explanation:

Greatest displacement

s=1/2at^2

= (9.8/2 ×9)m

= 44.1m

initial velocity

s=ut-1/2at^2

44.1= 3u -(1/2×9.8×9)

44.1=3u-44.1

3u=88.2

u=29.4m/s

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3 years ago

Is the text in red correct (0n0')

Ede4ka [16]

Yes the text in the red is correct.

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3 years ago

A capacitor has plates of area 1.64 * 10 ^ - 3 * m ^ 2 . To create a capacitance of 2.38 * 10 ^ - 9 * F , how far apart should t

lesya692 [45]

Answer:

6.1 * 10^-6

Explanation:

Acellus

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2 years ago

Which of the following changes will always increase the efficiency of a thermodynamic engine? Choose all correct statements.

Ilya [14]

Answer:B,C,D

Explanation:

Thermodynamic efficiency is given by

$\eta =1-\frac{T_C}{T-H}$

$\eta$ efficiency can be increased by Keeping $_c$ constant and increasing $T_H$

Keeping $T_H$ constant and decreasing $T_c$

by increasing $\Delta T=T_H-T_c$

by decreasing $\frac{T_C}{T_H}$ ratio

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3 years ago

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