PHYSICS HIGH SCHOOL

Which energy resource is renewable? A)
Fuel oil


B)
Natural gas


C)
Wind


D)
coal

Answers

Answer 1
Answer:

wind

you can reuse wind. we do eveyday

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If a train is 100 km away, how much sooner would you hear the train coming by listening to the rails (iron) as opposed to listening for it standing by the track? In other words, how much faster will the sound travel through the iron rails than through the air? Assume the air temperature is 0°C.Sound will reach you ______ seconds sooner.

302

324

280

Answers


Wellll . . . it's doubtful that you'd hear the sound of a train
from 100 km away (about 62 miles), but this is a fun problem
so let's go through it just for the math.

Online, I looked up the speed of sound in various materials.
Here's what I found:

-- Speed of sound in normal air . . . . .  343 m/s

-- Speed of sound in iron . . . . . 5,130 m/s 

But let's go a little farther !
Rails used to be made of cast iron or wrought iron. 
But now they're made of hot rolled steel.

-- Speed of sound in steel . . . . . 6,100 m/s

     Time to cover the distance = (distance) / (speed)

         Time through air  =  (100,000 m) / (343 m/s)

                                       =  291.5 sec  =  4 minutes 51.5 seconds

 Time through old iron rails  =  (100,000 m) / (5,130 m/s)

                                               =   19.5 seconds    (272 sec sooner)

 Time through new steel rails = (100,000 m) / (6,100 m/s)

                                                 =   16.4 seconds   (275 sec sooner)

Final answer:

The speed of sound varies in different mediums. In Physics, the speed of sound in air at 0°C is about 331.5 m/s, while in iron it's about 5130 m/s. If a train is 100 km away, the sound travelling through the iron rails would reach you approximately 282 seconds sooner than the sound through the air.

Explanation:

In Physics, the speed at which sound travels depends on the medium through which it's travelling. The speed of sound in air at 0°C is approximately 331.5 m/s. On the other hand, the speed of sound in iron is about 5130 m/s.

To determine how much sooner you would hear the train, we need to calculate the difference in time it takes for the sound to travel through these two mediums.

When the train is 100 km away, we get the following:

  1. Time through air: 100000 m / 331.5 m/s = 301.66 seconds
  2. Time through iron: 100000 m / 5130 m/s = 19.49 seconds

The difference is, therefore, approximately: 301.66 - 19.49 = 282.17 seconds. Thus, the sound will reach you 282 seconds sooner if you listen to the rails rather than the air.

Learn more about Speed of Sound here:

brainly.com/question/35989321

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A large sphere has a mass of 175 kg and is suspended by a chain from the ceiling. The mass of the chain is 12.0 kg. What is the tension in the chain?1830, N1610, N1720, N1940 N.

Answers


Each point in the chain supports the weight of all the mass below it.

At the bottom end of the chain, the weight is  (175 x 9.8) = 1,715 N .
At the top of the chain, the weight is  (175 + 12) x (9.8) = 1,833 N .

The tension in the chain varies linearly from  1,715N  at the bottom
to  1,833N  at the top.

Study the example and choose the influence on perception. Those computer geeks are all the same. They spend all day playing video games and programming their computers to serve them breakfast. I don't think I've ever seen one reading a real book or throwing a baseball. Why, they're almost like machines!a. primacy-recency
b. attribution
c. stereotyping
d. self-fulfilling prophecy

Answers

The choices above are social psychology termsthat help describe the people’s actions in their everyday interaction withpeople. The sentence example is: Those computer geeks are all the same.

Theyspend all day playing video games and programming their computers to serve thembreakfast. I don't think I've ever seen one reading a real book or throwing abaseball. Why, they're almost like machines! 

Is an example of stereotyping. Stereotypinghappens when a person applies a single group behavior or minority behavior to awhole group ‘s behavior sharing the same characteristic.

Answer:

C.) Stereotyping

Explanation:

Odyssey ware

Bees obtain food they need from flowers. The flowers benefit by having their pollen dispersed by the bees as they travel from flower to flower. What type of symbiotic relationship is this?

Answers

the type of symbioric relationship that both the flower that the bees ins is : Mutualism In mutualism relationship, both organims from the relationship benefit from each other. In this case, the bees benefited by getting their source of food from the flowers, and the flowers benefited by the bees helping them to started their reproductive process

Answer:

B - Mutualism

Explanation:

Just took the test Edge 2020

How do scientific tests help determine the properties of substances

Answers

It can help determine substances that appear similar but react differently under the same circumstances.

What is the largest speed this projectile can have without causing the cable to break?

Answers

What projectile ?
What cable ?
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