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Science Feedback

by Ron Kurtus

Readers have sent in a total of 4977 comments and questions on Science issues. They are listed according to date.

You can read them to further your understanding of the subject.



List of next 15 letters

Title

Topic

Country

Wants resources Rolling Friction South Korea
 
Is the number in the equation squared? Velocity Equations for Objects Projected Downward Kenya
 
How does electric current create a magnetic field? Moving Charges Create Magnetic Field Nigeria
 
Idea to use Lenz"s Law for artificial gravity Artificial Gravity Peru
 
Wants to rmaintain the strength of a iron pipe Density Factors India
 
Does Physics require being good in Maths? General South Africa
 
Understanding infrared Infrared Radiation USA
 
Density of object is equal to liquid Floating USA
 
Does mass affect fluid friction? Changing Fluid Friction USA
 
Range of IR that affect the eyes Infrared Radiation India
 
Converting matter Changing States of Matter Tanzania
 
Factory causing noise to home Sound and Obstacles USA
 
Why does temperature remain constant? Changing States of Matter USA
 
Telling about marine life General USA
 
Static electricity from tyres on road Electrostatic Induction Pakistan
 

Next 15 letters

 




First 15 letters


Rolling Friction

Wants resources

December 23, 2015

Question

Hi

I want to know the articles on this site information

Keyword : Rolling friction, plowing effect etc.

ASAP!!

Jaebeom - South Korea (26642)

Answer

There are resources listed toward the end of the Rolling Friction page.

I hope that helps.

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Velocity Equations for Objects Projected Downward

Is the number in the equation squared?

December 15, 2015

Question

from the equation v=±?[2gy+vi2],is it vi squared or vi multiplied by 2?

patrick - Kenya (26626)

Answer

When the number is behind the variable (vi) and is above it, that means the variable is squared. Another way of writing vi squared is vi^2.

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Moving Charges Create Magnetic Field

How does electric current create a magnetic field?

December 15, 2015

Question

how does an electric current creates a magnetic field when a current is passed through a wire. what is the process that goes on which causes the magnetic field to be formed by a current.

kevwe - Nigeria (26628)

Answer

Electric and magnetic fields are tied together, such that when one changes, it causes the other to change. It is a property of matter.

An electron has an electric field, but there is no noticeable magnetic field until the electron starts to move. When the electron moves, it creates a magnetic field, which moves along with it. Thus, a current in a wire is surrounded by a magnetic field.

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Artificial Gravity

Idea to use Lenz"s Law for artificial gravity

December 15, 2015

Question

If An astronaut use a magnetic suit within a copper's chamber, He needs to do a job for displacement due lenz's law. Read more:
Artificial gravity by lenz's effect

jorge - Peru (26630)

Answer

According to Lenz's Law, a moving magnet in a copper chamber will experience a resistance to that movement, due to the electric fields produced. That means that an astronaut in a magnetic suit would experience resistance to his movement in a copper chamber.

Artificial gravity would be a force pulling him toward the floor, whether he moved or not. Thus, I don't think Lenz's Law would apply.

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Density Factors

Wants to rmaintain the strength of a iron pipe

December 15, 2015

Question

sir we have steel tubing pipe having dia of1" and thickness 3mm and density of 7850. so can we reduce its density. or is there any way to reduce the weight of tube without changing strength....

sachin - India (26633)

Answer

The density of the pipe is set by its weight and volume. You might be able to reduce the weight of the pipe and adding a matrix around it to maintain its strength. However, it might be easier and less expensive to consider a different type of tubing. Best wishes in solving your problem.

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General

Does Physics require being good in Maths?

December 14, 2015

Question

Hey people,next year I'm going to grade 10 and I need your help,I want you to help me understand physics and does it include Mathematics??the reason I ask this is becouse I'm not really good at Maths.The thing I want to know is that,can I take physics even though I'm not that good at Maths.what's Physics is about I just need to know if I'm making the right decision?

nkosinathi - South Africa (26624)

Answer

Physics concerns the laws of matter, energy, and motion. There are equations for those laws, but at the basic level it is more important to understand what happens and how things work.

Later, you will need Mathematics and Algebra to apply those equations. Often, it is just putting numbers in the equations to get an answer.

If you are interested in what happens and how things work, you should do well with Physics. But also, try to improve your skills in Maths. You seem smart enough to be able to master both Physics and Maths if you work hard and keep a positive attitude.

Best wishes for success and grade grades next year.

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Infrared Radiation

Understanding infrared

December 14, 2015

Question

Goodmorning, i still find it very difficult to understand infrared.
why does infrared have a narrow beam angle while ultrasonic has a wide beam angle?
Infrared can not intercept glass or mirror. Why?
Infrared has the property of little spot. Why?
please i will equally like to get a recommended text on this. Thanks and God bless.

- USA (26616)

Answer

Infrared radiation consists of wavelengths slightly longer than visible light red.

The width of the beam angle depends on the source. A candle flame gives off infrared radiation in all directions.

Ultrasonic waves are very short wavelengths of sound. They are not related to light waves.

Infrared can pass through glass windows, except for energy efficient windows, which block the rays. Of course, mirrors reflect and do not transmit.

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Floating

Density of object is equal to liquid

December 14, 2015

Question

If the density of a body is equal to the given liquid then what will happen .? And how.?

- USA (26617)

Answer

Density is the mass divided by the volume. See Density of Matter.

If the density of an object is greater than that of the liquid, it will sink. If its density is less, it will float to the top. If the density of the object is the same as the liquid, it will stay somewhere within the liquid.

See How Objects Float in Fluids for more information.

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Changing Fluid Friction

Does mass affect fluid friction?

December 10, 2015

Question

Hi,
So I was wondering is mass affected fluid friction. For example, if you had a 1 kg block compared to a 2 kg block, would there be more fluid friction if you dragged them through water?

Thanks

Amanda - USA (26611)

Answer

The resistance in moving an object through the air or through water is dependent on the shape and size of the object. A 2 kg block would normally have more resistance than a 1 kg block. However, if the 2 kg block was streamlined, it could have less resistance.

If the blocks are sliding along a surface that is lubricated with water, the weight would be a factor.

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Infrared Radiation

Range of IR that affect the eyes

December 9, 2015

Question

Till what range(nm) of IR rays can be used without affecting human eyes?

sampath - India (26607)

Answer

Infrared radiation does not normally affect human eyes, unless it is high intensity or very bright. We can feel the infrared heat from a fire, but it does not affect the eyes. However, the Sun gives off IR and it can injure the eyes.

A greater concern is in the short wavelengths of ultraviolet rays. They are high energy and can injure the eyes. UV ranges from 400 nm to 10 nm.

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Changing States of Matter

Converting matter

December 8, 2015

Question

Explain how can matter be converted into another matter specify the process involved

EVASIUS NDAMILA - Tanzania (26600)

Answer

You can change the state or phase of a material from solid to liquid to gas and back by applying heat or cold.

However, one material cannot be changed to another material. Iron cannot be changed to copper.

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Sound and Obstacles

Factory causing noise to home

December 8, 2015

Question

I live in a subdivison in town and there is a large manufacturing plant behind us. The company will not build a wall to cut down on the noise and we are left wondering what to do about it? Any ideas or suggestions would be helpful. HayneBrands, Inc, factory on Clark Rd in Clarksville, AR 72830.

Steve - USA (26602)

Answer

I am sure that living near a noisy manufacturing plant is annoying and unfortunate.

One thing you can do is to gather your neighbors and bring this problem up to your city officials. They might be able to put some heat on the company to be considerate of their neighbors.

Another possible solution is planting high shrubs or such to try to block out some of the sound. However, that might not give much relief.

Best wishes in finding a solution to your problem.

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Changing States of Matter

Why does temperature remain constant?

December 2, 2015

Question

I am teacher of 6th graders learning about phase of matter change. I am having trouble explaining why the temperature remains the same while freezing is happening. Any help would be appreciated. Thank you

mary - USA (26587)

Answer

I just added an explanation at Temperature Constant During Phase Change. I hope that helps. Let me know if it clarifies things for your students.

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General

Telling about marine life

November 30, 2015

Question

i like it can u really answer ?s if so can u tell me about marine life

justice - USA (26582)

Answer

I'm sorry, but I don't have a section on Marine Life. However, you can check out Marine life and Biology for a lot of information.

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Electrostatic Induction

Static electricity from tyres on road

November 26, 2015

Question

when rubber tyres rubbed on road what type of charge will be on tyres.

- Pakistan (26565)

Answer

The rubber tyres would gain negative (-) electric charges, while the asphalt road would gain positive (+) charges. However, about 20 years ago, the tyre companies added material to greatly reduce the charge buildup.

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