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Korolek [52]
3 years ago
14

From your understanding of the relationship between temperature and pressure, what temperature would boiling water attain in the

open pot of a backpacker camping at 10,000 feet above sea level where the air pressure is about third of the pressure at sea level? does water boil faster or slower at that elevation?
Physics
2 answers:
krok68 [10]3 years ago
7 0

The water will boil at lower temperature and faster at higher altitude/elevation.

Explanation

Boiling point, the temperature at which the liquid starts to break their bonds and starts to vaporize.

The mechanism at that point is that the internal vapor pressure of the liquid will be equal with the surrounding pressure in order to get vaporize.

So the boiling point or boiling temperature is the external heat transferred to the liquid so that the liquid's internal vapor pressure will be equal with the surrounding pressure.

As in higher altitudes the pressure is less, so lesser energy is required to boil the liquid. While, in water, the boiling point is 100 deg Celsius at sea level.

But when the same water molecules will be heated at higher altitude of about 10000 ft above sea level, the boiling temperature will be less than 100 °C and the boiling point will be reached faster than the time taken to achieve the boiling temperature of water at sea level.

This is because, at higher altitude the surrounding pressure will be less, so the external heat energy required to equate the internal vapor pressure of water with surrounding pressure will be less.

Thus, the water boils at lower temperature and faster at the elevation.

aliina [53]3 years ago
3 0
Water will boil faster at a higher elevation.  Air pressure<span> affects the    </span>temperature<span> at which </span>water boils quickly but cooking <span>times will take longer at higher </span>altitudes.  This is due to a decrease in atmospheric pressure. An example would be putting an egg to boil.  Water boils at lower temperature but the egg <span> involves heating a food to a certain temperature, so, cooking would take longer. </span>
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A race car circles 10 times around a circular 8.0-km track in 20 min.
Otrada [13]
Find the average speed and the average velocity.

Average speed = distance / time

distance = 10 x 8000 m = 80,000 m
time = 20 min * 60 s/min = 1200 s

Average speed = 80,000 m / 1200 s = 66.67 m/s

Average velocity = displacement / time

Given that the race car made complete circles the final poin is the same initial point, then its displacement is zero and the average velocity is zero too.
6 0
3 years ago
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Experiments using "optical tweezers" measure the elasticity of individual DNA molecules. For small enough changes in length, the
GalinKa [24]

Answer:

Spring constant, k = 0.3 N/m

Explanation:

It is given that,

Force acting on DNA molecule, F=1.5\ nN=1.5\times 10^{-9}\ N

The molecule got stretched by 5 nm, x=5\times 10^{-9}\ m

Let k is the spring constant of that DNA molecule. It can be calculated using the Hooke's law. It says that the force acting on the spring is directly proportional to the distance as :

F=-kx

k=\dfrac{F}{x}

k=\dfrac{1.5\times 10^{-9}\ N}{5\times 10^{-9}\ m}

k = 0.3 N/m

So, the spring constant of the DNA molecule is 0.3 N/m. Hence, this is the required solution.

8 0
3 years ago
i)Distinguish between different methods of charging. ii) You are provided with a positively charged gold leaf electroscope. Stat
AleksAgata [21]

Answer:

Explanation:

On rubbing a glass rod with silk, the electrons from the glass rod get transferred to the silk. The silk now has an excess of electrons and so is negatively-charged. On the other hand, the glass rod is deficient in electrons and hence is positively-charged.

In the above case, the silk undergoes negative electrification.

Now, when the positively charged glass rod is touched on the disc of a negatively charged gold leaf electroscope, the electrons shifts towards rod, hence amount of charge on gold leaves decreases and the divergence between the gold leaves decreases as unlike charges attract each other.

Hence, the divergence decreases when a glass rod rubbed with silk is brought near the disc of negatively charged electroscope.

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6 0
3 years ago
Please help!!!
iVinArrow [24]

A).  Her distance traveled was (700m + 500m) = <em>1,200 meters</em>

B).  Her displacement was (700m north + 500m south) = <em>200 meters north</em>

C).  Her average speed = (distance covered) / (time to cover the distance)

Speed = (1,200 meters) / (15 seconds)

<em>Speed = 80 meters/second</em>

(Layne is an incredible walker !  That's about 179 miles per hour.)

(She walks 700m in 10 seconds.  Usain Bolt runs only 100m in 10 seconds.)

D).  Her averge velocity = (displacement) / (time)

Velocity = (200 meters north) / (15 seconds)

<em>Velocity = (13 and 1/3) m/s north</em>

(This is only about 33% faster than Usain Bolt, if he went straight instead of doubling back, and if he could keep it up for 200 meters instead of only 100 meters.)

6 0
3 years ago
A race car accelerates uniformly at 14.2 m/s2. If the race car starts from rest how fast will it
Kaylis [27]

Answer:

vf=94.4 m/s

Explanation:

acceleration is the final velocity minus initial velocity divided by time

a = (vf-vi)/t

Given:

a= 14.2 m/s^2

vi= 0 (at rest)

t = 6.6

Solve for vf

a = (vf-vi)/t

a*t=vf-vi

(14.2)*(6.6)=vf - 0

vf=94.4 m/s

6 0
3 years ago
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