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3 years ago

The source of electromagnetic waves is _____.

Physics

1 answer:

prisoha [69]3 years ago

4 0

Answer:

its electric or magnetic fields, i think its electric fields

Hope its right

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An ideally efficient heat pump delivers 1000 J of heat to room air at 300 K. If it extracted heat from 260 K outdoor air, how mu

choli [55]

Answer:

Wnet, in, = 133.33J

Explanation:

Given that

Pump heat QH = 1000J

Warm temperature TH= 300K

Cold temperature TL= 260K

Since the heat pump is completely reversible, the combination of coefficient of performance expression is given as,

From first law of thermodynamics,

COP(HP, rev) = 1/(1-TL/TH)

COP(HP, rev) = 1/(1-260/300)

COP(HP, rev) = 1/(1-0.867)

COP(HP, rev) = 1/0.133

COP(HP, rev) = 7.5

The power required to drive the the heat pump is given as

Wnet, in= QH/COP(HP, rev)

Wnet, in = 1000/7.5

Wnet, in = 133.333J. QED

So the 133.33J was the amount heat that was originally work consumed in the transfer.

Extra....

According to the first law, the rate at which heat is removed from the low temperature reservoir is given as

QL=QH-Wnet, in

QL=1000-133.333

QL=866.67J

5 0

3 years ago

You are falling off the edge.. What should you do to avoid falling..

Ugo [173]

If it is a matter of which way you are going you could lean forward. It would help to put all the weight opposite of where you are falling.

3 0

3 years ago

Read 2 more answers

A 700 kg racecar slowed from 30 m/s to 15 m/s. What is the change in momentum

Lerok [7]

Momentum = (mass) x (speed)

Original momentum = (700 kg) x (30 m/s) = 21,000 kg-m/s

Final momentum = (700 kg) x (15 m/s) = 10,500 kg-m/s

Change in momentum = - 10,500 kg-m/s .

8 0

3 years ago

1. Claim: Write a sentence stating whether texting and driving is potentially hazardous

My name is Ann [436]

Answer:

Texting and driving is potentially hazardous because it can cause death to yourself as well as someone else, car crashes, or run red lights and causing collisions.

Explanation:

3 0

3 years ago

Determine the magnitude of the force F1F1 component acting along the uu axis. Express your answer to three significant figures a

dybincka [34]

The first image below shows force F1 and the axes.

Answer: $(F_{1})_{u}=$ 3.62 kN