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julia-pushkina [17]
3 years ago
12

Need help with physics! Please provide explanation.

Physics
1 answer:
GrogVix [38]3 years ago
4 0
Electromagnetic Waves: This type of wave requires no medium (substance) to travel through.
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A heat engine is 20% efficient. If it loses 800 J to the cooling system and exhaust during each cycle, the work done by the engi
Maurinko [17]

Answer: A. 200J

Therefore, the workdone by the heat engine is 200J

Explanation:

Given ;

The efficiency of the heat engine is E = 20% = 0.2

Heat loss L= 800J

For an heat engine the efficiency is measured by the amount of workdone by the heat engine when compared to the heat generated.

Efficiency E = workdone/heat generated × 100%

Heat generated G= workdone W + heat loss L

G = W + L

According to the question.

W = 20% of G

W = 0.2G ......1

L = 80% of G

L = 0.8G

G = L/0.8 ......2

Substituting equation 2 to 1

W = 0.2(L/0.8)

And L = 800J

W = 0.2(800/0.8)

W = 200J

Therefore, the workdone by the heat engine is 200J

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3 years ago
Which of these is heated up the least by the sun's energy?
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Soil.............................
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4 years ago
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Deduce the relation between kwh and joule define 1 watt​
dimulka [17.4K]

Explanation:

We know that kWh is a commercial unit of energy.

Also, 1 Joule = 1 watt × 1 seconds

1\ kWh=1kW \times 1\ h

Since ,1 h = 3600 s and 1kW = 1000 W

1\ kWh=1000\ W \times 3600\ s\\\\1\ kWh = 36\times 10^5\ W-s\\\\1\ kWh=36\times 10^5\ J

So, the relation is : 1\ kWh=36\times 10^5\ J

1 watt is defined as the power of an appliance when the energy is transferred at a rate of 1 Joule per second.

5 0
3 years ago
How much Kinetic Energy does a 1.5 kg book at rest on top of a 2.3 m tall desk have?
anygoal [31]

A book falls off of a \displaystyle 2.2m high    table. If the book weighs \displaystyle 0.75kg, what will its    final velocity be right before it hits the ground?

4 0
2 years ago
I’m confused on this worksheet can someone help
Finger [1]

Answer:

well for C the horse is at rest at 10 to 15

D is 0 to 10

E is 15 to 25

Explanation:

If you search up examples it will help with this worksheet.

If I am work then I appologize

5 0
3 years ago
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