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3 years ago

What is the transfer of heat by the flow of a heated material?

1 answer:

7 0

Heat flux is a quantitative, vectorial representation of heat-flow through a surface. ...Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.

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Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as the volume of water that will cover 1 a

Alex17521 [72]

Answer:

Volume = 1,015 acre-feet (Approx)

Explanation:

Given:

Rain = 1.7 in

Time = 30 min

Area = 29 km²

Find:

Volume in acre-feet

Computation:

1 km = 1,000 m

1 m = 3.28 feet

1 km² = 247.105 acre

d = 1.7 in = 1.7 / 12 = 0.14167 ft

Area = 29 × 247.105 = 7,166.045 acre

Volume = 7,166.045 acre × 0.14167 ft

Volume = 1,015 acre-feet (Approx)

7 0

2 years ago

A person's speed around the Earth is faster at the poles than it is at the equator.

VashaNatasha [74]

Answer:

Explanation:

it is faster at the equator

6 0

2 years ago

How long a star lives and what it becomes at the end of its life depends primarly on what

liraira [26]

I believe the answer would be mass. Low mass stars and medium mass stars often become white dwarfs when they die while high mass stars explode in violent explosions called supernovas and usually leave behind a black hole or a neutron star.

4 0

2 years ago

A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 63 Btu of heat is tr

jolli1 [7]

Answer:

The water would have a change in the energy of 50 BTU

Explanation:

Under the assumption that the piston-cylinder system is a closed system, then the conservation law of the system would be: $E_{in}-E_{out}=E_{change}$ , where $E_{in}$ is all the energy that goes into the system, $E_{out}$ is all the energy that leaves the system and, $E_{change}$ is the change of the energy of the system.
For this case the energy that is feeded to the system is heat: 63 BTU.
There is two ways that energy is leaving this system: 8 BTU of heat as losses through the side walls and, 5 BTU of work done by the vapor on the piston.
Then the change of energy of the system is: $E_{change}=E_{in}-E_{out}=63 BTU-(8BTU+5BTU)=50BTU$ .

6 0

2 years ago

Find the acute angles between the curves at their points of intersection. (The angle between two curves is the angle between the

ladessa [460]

Answer:

1.190390345 degrees.

Explanation:

As stated in the problem that the angle between the two curves is also the angle between slopes of the two cures at the point of intersection, which is 1 (when we set two equation equal and solve for x).

We know, if you don't you could verify it for yourself and it will be a nice mathematical exercise for you, that when there are two lines with slopes $m_1$ and $m_2$ then the angle between them and their two slopes has following relationship.

$tan(\alpha ) = |\frac{m_2-m_1}{1+m_1m_2}|$ where $\alpha$ is angle between the two lines.

As it is clear that we can easily get the angle between the two curves if we know slopes at that point, which you will see in second is very straight forward to calculate.

Slopes are simply derivatives evaluated at the point of intersection and the two derivatives are $D_1$ 16x and $D_2 =24x^2$ , substituting x =1 we get, $m_1 = 16$ and $m_2 = 24$ .

Now put $m_1$ and $m_2$ in this relationship, rearrange and solve for angle, it will come out to be

$\alpha$ = 1.190390345 degrees.

that is our angle that we want to know between the two cures at the point of their intersection.

3 0

2 years ago