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4 years ago

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An air compressor compresses 15 L/s of air at 120 kPa and 20°C to 800 kPa and 300°C while consuming 6.2 kW of power. How much of

this power is being used to increase the pressure of the air versus the power needed to move the fluid through the compressor?

1 answer:

Nuetrik [128]4 years ago

6 0

Gas constant $R = 0.287 kPa.m^3/kg.K$

Specific volume of the air at the compressor inlet is:

$v_1=\frac{RT_1}{P_1}\\ v_1=\frac{0.287\times 293}{120} =0.7008 m^3/kg$

The air mass flow rate:

$\dot m=\frac{\dot V_1}{v_1}\\ \dot m = \frac{15\times 10^{-3}}{0.7008} = 0.0214 kg/s$

The flow work:

$\dot W_{flow}=\dot m R(T_2-T_1)\\ \dot W = 0.0214\times 0.287 \times 280=1.72 kW$

Power used to increase the air pressure:

$\dot W_p=\dot W_{in}-\dot W_{flow}=6.2-1.72 =4.48 kW$

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D) If the composition of a sample is fixed, the sample is a pure substance.

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A) It can be separated by using physical means, such as filtering.

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C) If the composition of a sample varies, the sample is a pure substance.

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3 years ago

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3 years ago

An ocean wave has an amplitude of 2.5 m. Weather conditions suddenly change such that the wave has an

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4 years ago

A 60kg bicyclist (including the bicycle) is pedaling to the

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a) 4 forces

b) 186 N

c) 246 N

Explanation:

a)

Let's count the forces acting on the bicylist:

1) Weight ( $W=mg$ ): this is the gravitational force exerted on the bicyclist by the Earth, which pulls the bicyclist towards the Earth's centre; so, this force acts downward (m = mass of the bicyclist, g = acceleration due to gravity)

2) Normal reaction (N): this is the reaction force exerted by the road on the bicyclist. This force acts vertically upward, and it balances the weight, so its magnitude is equal to the weight of the bicyclist, and its direction is opposite

3) Applied force ( $F_A$ ): this is the force exerted by the bicylicist to push the bike forward. Its direction is forward

4) Air drag ( $R$ ): this is the force exerted by the air on the bicyclist and resisting the motion of the bike; its direction is opposite to the motion of the bike, so it is in the backward direction

So, we have 4 forces in total.

b)

Here we can find the net force on the bicyclist by using Newton's second law of motion, which states that the net force acting on a body is equal to the product between the mass of the body and its acceleration:

$F_{net}=ma$

where

$F_{net}$ is the net force

m is the mass of the body

a is its acceleration

In this problem we have:

m = 60 kg is the mass of the bicyclist

$a=3.1 m/s^2$ is its acceleration

Substituting, we find the net force on the bicyclist:

$F_{net}=(60)(3.1)=186 N$

c)

We can write the net force acting on the bicyclist in the horizontal direction as the resultant of the two forces acting along this direction, so:

$F_{net}=F_a-R$

where:

$F_{net}$ is the net force

$F_a$ is the applied force (forward)

$R$ is the air drag (backward)

In this problem we have:

$F_{net}=186 N$ is the net force (found in part b)

$R=60 N$ is the magnitude of the air drag

Solving for $F_a$ , we find the force produced by the bicyclist while pedaling:

$F_a=F_{net}+R=186+60=246 N$

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3 years ago

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KonstantinChe [14]

Answer:

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v = Velocity of ice

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$Q_3=mL_i\\\Rightarrow Q_3=m(333.5\times 10^3)\\\Rightarrow Q_3=m(0.3335\times 10^6)$

Total heat released is

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The kinetic energy of the bullet will balance the heat

$K=Q\\\Rightarrow \frac{1}{2}mv^2=3008100m\\\Rightarrow v=\sqrt{2\times 3008100}\\\Rightarrow v=2452.79432\ m/s$

The velocity of the ice would be 2452.79432 m/s

6 0

4 years ago