Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard. Which of the following was NOT a reason for banning them?

Answers

Answer 1

Answer:

Answer:

PCBs have high electrical resistance and are excellent insulating materials.

Explanation:

Polychlorinated biphenyls [PCBs] are industrial chemical compounds made by man, which contains carbon, hydrogen and chlorine atoms. They can be used in the production of paints and dyes, heat transfer, etc.

There has been the ban on the use of these compounds because they are said to be very stable, and yield slowly to degradation by nature. They have low and not high electrical resistance.

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What is a quantity Described completely by its magnitude

Answers

Answer:

Scalar

Explanation:

A physical quantity that is completely described by its magnitude; examples of scalars are volume, density, speed, energy, mass, and time. Other quantities, such as force and velocity, have both magnitude and direction and are called vectors.

A wave oscillates 50 times per second. What is its frequency?

Answers

Answer: The frequency of the wave is 0.02 Hertz.

Explanation:

Frequency is a parameters which describe a wave. This is defined as the number of oscillations happening per unit second.

Mathematically,

$Frequency=\frac{1}{\text{Number of oscillations}}$

In the question,

Number of oscillations happening per second = 50

Putting this value in above equation, we get:

$Frequency=(1)/(50)\n\n\nu=0.02Hz$

Hence, the frequency of the wave is 0.02 Hertz.

You just told us how many times per second the wave oscillates. That's a definition of frequency. So the frequency of this wave is 50 per second or 50 hertz.

A trombone has a variable length. When a musician blows into the mouthpiece and causes air in the tube of the horn to vibrate, the waves set up by the vibrations reflect back and forth in the horn to create standing waves. As the length of horn is made shorter, what happens to the frequency?A) The frequency will increase or decrease depending on how hard the horn player blows.
B) The frequency will increase
C) The frequency will decrease
D) The frequency will increase or decrease depending on the diameter of the horn.
E) The frequency will remain same

Answers

Answer:

B) The frequency will increase

Explanation:

The length of the instrument is given by

$L=(\lambda)/(2)\n\Rightarrow \lambda=2L$

Wavelength is given by

$\lambda=(v)/(f)$

$(v)/(f)=2L\ or\ L\propto (1)/(f)$

It can be seen that the length is inversely proportional to the frequency.

Here, the length of the trombone is decreasing so the frequency will increase.

Which best describes how heat flows? A. Heat flows from a warmer object to a colder object. B. Heat flows in any direction. C. Heat flows from a colder object to a warmer object. D. All objects transfer to their heat to all other objects.

Answers

The statement which best describes how heat flows is that the heat generally flows from a warmer object to a colder object. Therefore, the correct option is A.

The mechanism of heat flow significantly describes the transfer of heat energy or enthalpy from one object to another. It is transferred through the process of conduction, convection, and radiation.

The object that is warmer in appearance may accumulate heat in enough amounts. This leads to an increase in its temperature and energy, While the mechanism of heat transfer generally initiates this warmer object to a colder object by conduction.

To learn more about Heat flow, refer to the link:

brainly.com/question/16055406

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Heat flows from a warmer object to a colder object

How is the Maunder minimum related to climate? a. Unusually low sunspot activity correlates to unusually cold climatic events.
b. The Maunder minimum is unrelated to climate.
c. Changes in the Earth’s tilt correlate to changes in climate.
d. Changes in the Earth’s orbit correlate to changes in climate.

Answers

Maunder minimum is related to climate due to the unusually low sunspot activity correlates to unusually cold climatic events. The answer is letter A. It happened around 1645 and 1715 and also coincided with the phenomena ‘Little Ice Age’ (1500 – 1850) in the Northern Hemisphere.

What body systems are involved in excretion of wastes? A) integumentary, muscular, nervous, digestive B) respiratory, circulatory, digestive, muscular C) digestive, muscular, nervous, endocrine, respiratory D) integumentary, digestive, respiratory, urinary, circulatory

Answers

Answer:

The correct option is D

Explanation:

Integumentary system consists of organs including the skin which is used in the excretion of sweat.

Digestive system consists of organs including the tongue, pancrease, gallbladder and liver. The liver for example regulates toxic substances in the body and excretes a substance known as bile.

Respiratory system consists of organs including the lungs which is used to breathe in oxygen and breathe out carbon dioxide.

Urinary system consists of the kidneys, urethra, bladder and ureters; they are involved in the excretion of urine.

Circulatory system consists of the blood, the blood vessels and heart. The circulatory system also assists in the removal of carbon dioxide from the body.

Answer: D

Explanation:

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