If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called

Answers

Answer 1

Answer: obviouskly lower concentrstion

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A scientist studies how sunlight affects a person's skin. Which of the following is a testable question about this topic?A, Does being in the sun make your skin dry?B. Do people look better when they have a suntan?C. What is the most enjoyable time to be in the sun?D. Should children be allowed to lie in the sun?
A force of 2.0 n exerted on an object for 0.1 seconds increases the objects velocity by 1.0 m/s you what is the mass of the object?
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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:

Time through air: 100000 m / 331.5 m/s = 301.66 seconds
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:

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Explain how DNA codes for traits

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the genetic code dictates which proteins the cell manufacturer. proteins are strands of amino acids. the sequence of nucleotides in DNA genes determines the order of amino acids in a protein. this is the direct connection between your genes and your traits.

What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?

Answers

This can be seen as a trick question because heat engines can typically never be 100 percent efficient. This is due to the presence of inefficiencies such as friction and heat loss to the environment. Even the best heat engines can only go up to around 50% efficiency.

Answer:

An infinite temperature

Explanation:

The efficiency of an engine is defined as:

$\eta=1 -(T_C)/(T_H)$

where

$T_H$ is the temperature at which heat enters the engine

$T_C$ is the temperature of the environment, to which the engine exhausts heat

From the formula, we see that for an engine to be 100% efficient, the fraction

$(T_C)/(T_H)$

must be equal to zero. Since the value of $T_C$ is never zero (the temperature is expressed in Kelvin, and the temperature of the environment can never be exactly 0 K), the only possibility for that to occur is that the temperature at which heat enters the engine ( $T_H$ ) is infinite, so that this fraction becomes zero and the efficiency becomes 1.

To do work, this truck uses energy stored in chemical fuel and an electrical battery.An illustration of truck with a wide arrow away from it labeled input energy? J and it splits into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J.
How much total energy does this truck put out?

A. 50 J
B. 250 J
C. 400 J
D. 800 J

Answers

Answer: D 800j
explanation: Just add all provided numbers

Why do electromagnetic waves not require a medium for travel?A) because electromagnetic waves travel too fast for stationary particles to move with them
B) because electromagnetic waves transmit energy without compressing the particles of the medium
C) because electromagnetic waves generate their own particles for compression and use these for movement
D) because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-D space

Answers

The answer is B) because electromagnetic waves transmit energy without compressing the particles of the medium. Electromagnetic waves are not like mechanical waves (ex. sound waves) because they do not need a medium to propagate. Electromagnetic waves continuously propagates as electric fields and magnetic fields generate each other.

Answer:

B) because electromagnetic waves transmit energy without compressing the particles of the medium

Explanation:

Electromagnetic waves are the combination of electric and magnetic field which will oscillate perpendicular to each other. And the propagation of wave here is perpendicular to both electric and magnetic field.

So here in this type of wave propagation we do not require any medium as this is propagation of electric and magnetic field.

So here no need of compression or rarefaction of medium molecules and hence it do not need any medium to travel

so here correct answer is

B) because electromagnetic waves transmit energy without compressing the particles of the medium

What is the importance of the ozone layer?

Answers

Importanceofozonelayer:

The ozone shields the surface of the earth from ultraviolet UV radiation from the sun.
These radiations are highly damaging as they can cause cancer in both plants and animals, damage to eyes and immune system.
They can also lead to variations in global rainfall, ecological disturbances and dwingling of global food suppliers.

Explanation:

Formationofozonelayer:ozone at the higher level of the atmosphere is a product of UV radiations acting on oxygen O2 molecule. The higher energy UV radiations split apart some molecular oxygen( O2) into free oxygen (O) atoms.

Depletionodozonelayer:The amount of ozone in the atmosphere began to drop sharply in the 1980's . This decrease has been linked to synthetic chemicals like cholorofluorocarbons ( CFC's ) which are used as refrigerants and in fire extinguishers.

to protect us from the harmful UV rays from the sun so we don't become human bacon

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