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Dima020 [189]
2 years ago
11

A typical home in the northern U.S. might require 120 MBtu of heat for the average winter.

Physics
1 answer:
eimsori [14]2 years ago
0 0

200 MBtu of heat

Explanation:

As provided in the question, heat supplying natural gas furnace operates at 60% efficiency. It means that out of 100 units of heat energy produced by the furnace, only 60 units of heat can be transferred.

Thereby as the demand of the heat energy is 120 MBtu, amount of gas that needs to be purchased equals-

∴ 60% of (cubic metres of gas that needs to be purchased) = 120 MBtu

⇒ (60/100) * gas = 120

⇒ Gas= 120*100/60

∴ Cubic metres of gas that needs to be purchased= 200MBtu

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Answer:

It is the smarter option.

Explanation:

Renewable energy is the cheapest source of new power generation for more than two-thirds of the world and has no fuel costs. It can reduce the economic burden of energy bills by eliminating fuel charges — especially when coupled with energy-efficiency upgrades in our homes and businesses.

3 0
1 year ago
A child swings on a playground swing. How many times does the child swing through the swing's equilibrium position during the co
Karolina [17]
<h2>The child swing through the swing's equilibrium position 6 times during the course of 3 periods.</h2>

Explanation:

One period means time taken to complete one revolution.

In case of swings in one period time it travels the same position through two times.

Here we need to find how many times does the child swing through the swing's equilibrium position during the course of 3 period(s) of motion.

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The child swing through the swing's equilibrium position 6 times during the course of 3 periods.

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6 0
2 years ago
What is the final velocity, in m/s, of a hoop that rolls without slipping down a 8.20 m high hill, starting from rest?
pantera1 [17]

Answer:

12.68 m/s.

Explanation:

Equations of motion:

i. S = vi*t + 1/2 * a*(t^2)

ii. vf = vi + a*t

iii. vf^2 = vi^2 + 2a*S

Where, vf = final velocity

vi = initial velocity

S = distance travelled

a = acceleration due to gravity

t = time taken

Given:

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S = 8.2 m

vf = ?

a = 9.81 m/s^2

Using iii. Equation of motion,

vf^2 = vi^2 + 2a*S

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Which 2 forces are always opposite from one another
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Answer:

Any two forces that are always opposite from one another are :

Explanation:

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4 0
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