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3 years ago

2. What formula relates work and power?

Engineering

1 answer:

laiz [17]3 years ago

7 0

Answer:

$Power= \frac {Work}{Time}$

Explanation:

Power is defined as the rate of work done per unit time. Therefore, to obtain power, we divide work by time.

$Power= \frac {Work}{Time}$

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Why the water levels in the various pizometerce tubes are different?

Nitella [24]

Answer:

They are different due to the size and water levels like a lake say it’s at 70% full but the next day it’s so hot now its at 66% full it’s cause the water levels are changing due to the diffent climates and regions

Explanation:

Uphill you may get less water down hill you may get more water

3 0

4 years ago

An automotive fuel cell consumes fuel at a rate of 28m3/h and delivers 80kW of power to the wheels. If the hydrogen fuel has a h

EastWind [94]

Answer:

The efficiency of this fuel cell is 80.69 percent.

Explanation:

From Physics we define the efficiency of the automotive fuel cell ( $\eta$ ), dimensionless, as:

$\eta = \frac{\dot W_{out}}{\dot W_{in}}$ (Eq. 1)

Where:

$\dot W_{in}$ - Maximum power possible from hydrogen flow, measured in kilowatts.

$\dot W_{out}$ - Output power of the automotive fuel cell, measured in kilowatts.

The maximum power possible from hydrogen flow is:

$\dot W_{in} = \dot V\cdot \rho \cdot L_{c}$ (Eq. 2)

Where:

$\dot V$ - Volume flow rate, measured in cubic meters per second.

$\rho$ - Density of hydrogen, measured in kilograms per cubic meter.

$L_{c}$ - Heating value of hydrogen, measured in kilojoules per kilogram.

If we know that $\dot V = \frac{28}{3600}\,\frac{m^{3}}{s}$ , $\rho = 0.0899\,\frac{kg}{m^{3}}$ , $L_{c} = 141790\,\frac{kJ}{kg}$ and $\dot W_{out} = 80\,kW$ , then the efficiency of this fuel cell is:

(Eq. 1)

$\dot W_{in} = \left(\frac{28}{3600}\,\frac{m^{3}}{s}\right)\cdot \left(0.0899\,\frac{kg}{m^{3}} \right)\cdot \left(141790\,\frac{kJ}{kg} \right)$

$\dot W_{in} = 99.143\,kW$

(Eq. 2)

$\eta = \frac{80\,kW}{99.143\,kW}$

$\eta = 0.807$

The efficiency of this fuel cell is 80.69 percent.

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3 years ago

The Release Train Engineer is a servant leader who displays which two actions or behaviors?

IrinaK [193]

Explanation:

The Release Train Engineer (RTE) has the main work of supporting as well as coaching the Agile Release Train (ART). They are capable of steering ART successfully and to navigate the complexity in delivering the software in large and inter-functional environments.

They serve the scrum master and coach teams to improve on the results.

The two actions or behaviors of the RTE are :

1. They try to create an environment of the mutual influence.

2. Listens and also supports the teams in problem identification as well as decision-making.

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4 years ago

The use of seatbelts in a car has significantly reduced the number of crash fatalities. Which statement best explains how societ

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as the public need for preventing injuries and deaths from car crashes became known,laws were enacted to mandate the inclusion of seatbelts in almost all passengers vehicles

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3 years ago

FRIDAY<br> What does a lockbar do?

IrinaK [193]

Answer:

it increases the life of a frame lock

Explanation:

because it decreases wear on the lock face

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2 years ago

Read 2 more answers

2. What formula relates work and power?​

2. What formula relates work and power?