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12345 [234]
3 years ago
11

One way for a family to determine their energy use is by analyzing their electric bill each month. Most energy bills include a g

raph displaying energy use over the last 12 months. This allows people to consider their energy use and make adjustments if needed. Mr. Hernandez noticed his family's usage for this December was about the same as last December, even though they were gone on vacation for about a week and a half this year. Since they were not home for a portion of the month, he expected their energy usage would be significantly lower. He calls a family meeting to discuss how they can reduce their energy bill next December, when they take another family vacation.
Which idea will reduce their energy usage the most, while also reasonable to follow?
A) For the time they are home during December, cook meals outside on the charcoal grill instead of inside with the electric stove/oven.
B) When they return from their trip, leave the television off for a week, and hang clothes up outside to dry instead of using their electric dryer.
C) Before leaving for their trip, turn the central heating system off, along with lights and electrical household appliances that will not be in use.
D) While they are home in December, they can use candles instead of electric lights, and put their food in coolers so they can unplug their refrigerator.
Physics
1 answer:
strojnjashka [21]3 years ago
4 0

Answer:

C)Before leaving for their trip, turn the central heating system off, along with lights and electrical household appliances.

Explanation:

Although, the other three options will also reduce their electricity bill but they do not explain why Mr. Hernandez's family got same electricity bill as last year even though this time they were not home for one and a half week. Also, A), B) and D) ideas are not reasonable.

So, the only conclusion is that even when they were on a vacation. the electrical appliances in their home were on. That's why the bill remained the same.

The idea of turning the central heating system off, along with lights and electrical household appliances before they leave for the trip will help reduce the energy usage. Also, it is reasonable.

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Answer: decibels

Explanation:

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A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket a light suddenly flashes. To an obs
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Answer:

B. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.

Explanation:

To an observer at rest in the rocket who can't see either sides of the rocket, the speed of the light is constant which means the distance to the front or the back is same and would appear to reach the rocket at the same time.

Although from the point of view of the person on the earth, the front of the rocket is travelling in opposite direction of the light while the back of the rocket is moving closer to the light. This means that the distance travelled by the light going forward will be longer going backwards. And since the speed of light is constant in both directions, the light will reach the back of the rocket before it reaches the front  for the observer on the earth.

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3 years ago
Read 2 more answers
19. A mass of gas has a volume of 4 m3, a temperature of 290 K, and an absolute pressure of 475 kPa. When the gas is allowed to
Aleks [24]

Recall this gas law:

\frac{P₁V₁}{T₁} = \frac{P₂V}{T₂}

P₁ and P₂ are the initial and final pressures.

V₁ and V₂ are the initial and final volumes.

T₁ and T₂ are the initial and final temperatures.

Given values:

P₁ = 475kPa

V₁ = 4m³, V₂ = 6.5m³

T₁ = 290K, T₂ = 277K

Substitute the terms in the equation with the given values and solve for Pf:

\frac{475*4}{290} = \frac{P₂*6.5}{277}

<h3>P₂ = 279.2kPa</h3>
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Write the terms involved in s=ut+1\2​
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s = displacement; u = initial velocity; t = time of motion

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Which telescopes must be placed in orbit around earth in order to observe short-wavelength radiation?.
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Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.

<h3>What is telescope?</h3>

A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.

When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.

Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.

To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.

Hence, space telescope is the correct answer.

To learn more about the telescope, refer:

brainly.com/question/556195

#SPJ1

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