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Vilka [71]
3 years ago
11

Can someone help me out??

Advanced Placement (AP)
2 answers:
grigory [225]3 years ago
8 0
I- thank you, this really opened my eyes DORTHY
Brut [27]3 years ago
8 0

Some times it happens its happend to me ALOT but its ok also hope you have a good day and stay safe and keep your head up :)

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Explanation:

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3 years ago
Many of the houses have fireplaces that are
viva [34]

By using a woodstove, the kilograms of wood required to

heat a room to 20°C is 3 kg

<h3>Efficiency of a machine</h3>
  • Efficiency is the percent of work put into a machine (input work) to that of the work done by the machine (output work).
  • Efficiency of a machine is always less than 100% because the output work is always less than the input work because some of the input work is used to overcome friction.

Efficiency = work output/work input * 100%

Efficiency of fireplaces = 15%

Amount of food required to heat a room to 20°C = 15 kg

Assuming efficiency of 100%, amount of wood required will be X kg:

X = 15% * 15 kg

X = 2.25 Kg

By switching to woodstoves which are 75% efficient, amount of wood required will be Y kg:

Y = 2.25 kg / 75%

Y = 3 kg

Therefore, by using a woodstove, the kilograms of wood required to

heat a room to 20°C is 3 kg

Learn more about efficiency of machines at: brainly.com/question/3617034

7 0
2 years ago
Factors that made the south distinct from the rest of the United States during the early nineteenth century
jeka57 [31]
They relied on and even encouraged slavery, and were heavily dependent on an agricultural economy/society
3 0
3 years ago
Two reasons why regions might change over time
slava [35]

If you mean geographically/biologically - the world is changing, and so will the environment, and with the problems we have now a days, it's likely to change fast in aspects such as temperature (will get hotter), fauna and flora (will decrease), etc.

If you mean politically - some countries might gain more territory trough battles or wars, and some other countries might possible "reclaim" long-lost lands that belong to them historycally.


Hope it helped,


BioTeacher101

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3 years ago
Which system is least affected by starvation? A. Muscular B. Nervous C. Skeletal D. Cardiovacular
nevsk [136]
The skeletal system is the answer
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3 years ago
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