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Juli2301 [7.4K]
3 years ago
15

Choose all correct sentences

Physics
1 answer:
muminat3 years ago
3 0

Answer:

Explanation:

Current in a. c circuit = V / total impedance

impedance = \sqrt{(R^2+( \omega L-\frac{1}{\omega C})^2 }

In resonance maximum current flows and for maximum current  impedance should be minimum .

For it  \omega L = \frac{1}{\omega C}

ω² = \frac{1}{LC}

OPTION  b is correct.

At resonance power is maximum because current is maximum and impedance is minimum.

OPTION c is correct.

quality factor = \frac{1}{R}\sqrt{\frac{L}{C} } }

Option  f is correct.

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Give two environmental effects of using wood as an energy resource.
vladimir2022 [97]

Answer:

Using wood also helps keep carbon out of the atmosphere, helping to mitigate climate change.

Deforestation.  

Explanation:

Trees store carbon dioxide as they grow. After harvest, wood products continue to store much of this carbon. These benefits continue when wood is reclaimed to manufacture other products.

Extraction of wood within the supply areas clearly affects the forest and the environment. Some of these impacts can be seen in the study areas. The rainfall is increasingly irregular, biodiversity has been lost. Communities have experienced flooding and drought, which adversely affects the most important sector in the country's economy, that of agriculture. The local populations are concerned about these impacts, which affect not only the environment but the whole social economy.

6 0
3 years ago
Read 2 more answers
Dependent variable is the _______ that happens because of the UI independent variable. (No answer choices provided)
Damm [24]

Answer: One is called the dependent variable and the other the independent variable. The independent variable is the variable the experimenter changes or controls and is assumed to have a direct effect on the dependent variable.

4 0
3 years ago
A playground merry-go-round spins about its axis with negligible friction. A child moves from the center of the merry-go-round t
Juli2301 [7.4K]

Answer:

B

Explanation:

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4 0
3 years ago
Calculate the electrical energy use of the microwave in 120 V circuit has 7.5 A current flow, if it used for 0.05 hours
Elden [556K]

Answer:

162 KJ

Explanation:

The electrical energy can be calculated using the formula

E = V×I×t

Where, V= voltage = 120 V

I is current in ampere = 7.5 A and t is time in seconds

1 hour = 3600 sec

Therefore, 0.05 hour = 3600×0.05 = 180 sec

Substitute the values in above equation find electrical power

E = 120×7.5×180

= 162000 J

= 162 KJ

Therefore, the electrical energy use of the microwave = 162 KJ

3 0
3 years ago
As a cold air mass advances on a warm air mass, what usually comes before it?​
Marina CMI [18]

Answer: A cold front occurs when a cold air mass advances into a region occupied by a warm air mass. If the boundary between the cold and warm air masses doesn't move, it is called a stationary front.

Explanation: Two types of occluded front exist: the warm-type and the cold-type. They’re distinguished by the relative temperatures of the air mass ahead of the occlusion – in other words, the air mass ahead of the original warm front – and the air mass behind the cold front. If the air behind the cold front is colder than the air ahead of the occlusion, it shoves beneath that air (because it’s denser) to form a cold-type occluded front. If the air behind the cold front is warmer than the air ahead, it rides over it to form a warm-type occluded front – which appears to be the more common case. In either situation, the lighter warm air representing the air mass originally between the warm and cold fronts sits above the boundary between the two cooler air masses.

Hope this helps!!

8 0
3 years ago
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