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snow_tiger [21]
3 years ago
11

• A flame always points upwards. Why do you think this is so?

Physics
1 answer:
valina [46]3 years ago
3 0

Answer:

A flame always point upwards because the flame's gas is hotter than the surrounding air and, like you said, a hot gas is always lighter or less dense than a cold gas.

Explanation:

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0.5-lbm of a saturated vapor is converted to asaturated liquid by being cooled in a weighted piston-cylinder device maintained a
klio [65]

Answer:

The boiling point temperature of this substance when its pressure is 60 psia is  480.275 R

Explanation:

Given the data in the question;

Using the Clapeyron equation

(\frac{dP}{dT} )_{sat } = \frac{h_{fg}}{Tv_{fg}}

(\frac{dP}{dT} )_{sat } = \frac{\frac{H_{fg}}{m} }{T\frac{V_{fg}}{m} }

where h_{fg is the change in enthalpy of saturated vapor to saturated liquid ( 250 Btu

T is the temperature ( 15 + 460 )R

m is the mass of water ( 0.5 Ibm )

V_{fg is specific volume ( 1.5 ft³ )

we substitute

(\frac{dP}{dT} )_{sat } =( \frac{250Btu\frac{778Ibf-ft}{Btu} }{0.5}) / ( (15+460)\frac{1.5}{0.5})  

(\frac{dP}{dT} )_{sat } = 272.98 Ibf-ft²/R

Now,

(\frac{dP}{dT} )_{sat } = (\frac{P_2 - P_1}{T_2 - T_1})_{sat

where P₁ is the initial pressure ( 50 psia )

P₂ is the final pressure ( 60 psia )

T₁ is the initial temperature ( 15 + 460 )R

T₂ is the final temperature = ?

we substitute;

T_2 = ( 15 + 460 ) + \frac{(60-50)psia(\frac{144in^2}{ft^2}) }{272.98}

T_2 = 475 + 5.2751\\

T_2 = 480.275 R

Therefore, boiling point temperature of this substance when its pressure is 60 psia is  480.275 R

3 0
3 years ago
The amount of potential energy depends on the objects _________ and position
disa [49]
Mass would be the answer
4 0
3 years ago
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They dont have the subject science- sorry for all the questions i have a 50 question quiz on something i dont even know..
VikaD [51]

Answer: well, A and c

Explanation:

4 0
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Falling overboard is a major risk on small boats. how can you reduce this risk?
lisabon 2012 [21]
<span>Falling overboard is a major risk on small boats. There are several things you can do in order to reduce this risk: 
</span>1. Everyone in the paddlecraft should  wear a life jacket at all times.2. The boat should not be overloaded.
3. Keep<span> most of the weight at the back Stay seated</span>4. Don’t allow people to stand up or move around while underway. 
5 0
3 years ago
What do astronomers mean when they say that the universe is homogeneous?
Brilliant_brown [7]

Answer:

The universe is the same in every location.

Explanation:

Astronomers are scientist that study the moons, galaxies, stars and planet. When the astronomers say that the universe is homogeneous, they mean that the universe appear the same in every location especially when it is viewed from a distance.

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