Negative sign in Fourier heat conduction equation indicates: A. Heat always flow is in the direction of positive temperature gradient B. Heat always flow in the direction of negative temperature gradient C. No heat flow is there D. Data is insufficient
Answers
The correct option is B ) Heat always flows in the direction of negative.
The negative sign in Fourier's warm conduction condition (moreover known as the warm condition) shows that warm streams are within the heading of the negative temperature slope.
The warm condition is given by:
∂u/∂t = α (∂^2u/∂x²)
where
u is the temperature at a point in a fabric,
t is time,
x is the position arranged,
and α is the warm diffusivity of the fabric.
The negative sign within the condition implies that the temperature angle (∂u/∂x) is negative, and consequently, warm streams from higher temperature regions to lower temperature districts.
This is often the basic rule of heat exchange, which states that warm continuously flows from higher temperature locales to lower temperature districts.
Hence, the right choice is
B. Heat always flows in the direction of negative
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Related Questions
HELPPPP PLSSS I NEED HELP
Answers
Answer:
D. Pearl Harbor
Explanation:
A 5kg traveling at 4 m/s slams into a 1kg object and sticks to it. What will the final velocity of the two objects be?
Answers
Answer:
Below
Explanation:
Using conservation of momentum
mv = mv
5(4) + 1(0) = (4+1) v
( this assumes the 1 kg mass was not moving before being struck)
20 = 5 v
v = 4 m/s
If the magnitude of the electric field at point p is 5. 0 × 104 n/c and the distance between the plates is 0. 80 mm , what is the electrical potential difference between the plates?
Answers
The electrical potential difference between the plates is 40 V.
The magnitude of the electric field at point p = 5.0 × 104 N/C
Distance between the plates = 0.80 mm = 0.80 × 10-3 m
The formula used to find the electrical potential difference between the plates is,
V = Ed
Where,
V = electrical potential difference between the plates
E = electric field strength
d = distance between the plates.
Substituting the given values in the formula,
V = Ed= 5.0 × 104 N/C × 0.80 × 10-3 m= 40 V
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If a body is dropped from the same height once in the equator and then in polar region in which place will it fall faster? why
Answers
Explanation:
equator.
because the "belly" of the Earth around the equator makes the Earth there thicker than from pole to pole.
the reason is the spinning of our planet. as the spinning speed is the fastest at the thickest part of a ball (at the equator), that ball has the tendency due to the centrifugal force to extend even further there, and the extra material for that is being pulled in from the poles.
therefore, the diameter through the Earth from equator to equator is larger than the diameter from pole to pole.
and that means that there is more mass from equator to equator than from pole to pole.
and that means that gravity is stronger at the equator.
therefore, a body will fall faster at the equator than on a pole.
You have a cup with 50cm filled with water. How much pressure will the water act on the bottom of the cup? The density of water is 1000kg/m^3 and g = 10N/kg
Answers
Answer:
5000 N/m².
Explanation:
The following data were obtained from the question:
Density (d) = 1000 kg/m³
Acceleration due to gravity (g) = 10 N/kg
Height (h) = 50 cm = 50/100 = 0.5 m
Pressure (P) =.?
Pressure is related to density and height by the following equation:
P = dgh
Where
P is the pressure.
d is the density.
g is the acceleration due to gravity.
h is the height.
With the above formula, we can obtain the pressure at the bottom of the cup as follow:
P = dgh
P = 1000 x 10 x 0.5
P = 5000 N/m²
Therefore, the pressure at bottom of the cup is 5000 N/m².
Time running out plzz hurry!!!!!!
Answers
Answer:
I THINK ITS B but I'm not suresorry
Heat capacity is an intrinsic physical property of a substance that measures the amount of heat required to change that substance's
temperature by a given amount. The specific heat is the amount of heat necessary to change the temperature of 1.00 kg of mass by
1.00°C. Its Sl unit is //(kg-K) or J/(kg C).
Insulation is an important part of the building process; we insulate our homes, schools and businesses to conserve energy. Insulation
helps to help us cool p the summer and warm in the winter. Students were asked to design an insulating box, one that would keep
ice cubes from melting using any of the materials listed above. Which material would you pick? Explain why. Choose ALL the answers
that would apply.
A)
Cork
B)
Copper
It is a solid
D)
It has the lowest specific heat capacity of any solid.
It has the highest specific heat capacity of any solid.
Answers
Answer: It’s Cork , It is a Solid , It has the highest specific heat capacity of any solid
So. A,C,E!!!
Explanation:
Answer: I agree with the other person. The answer is Cork.
Explanation: The answer is Cork because:
It's a solidHas the highest specific heat capacity of any solidIf John walks 10 m to the right, 6m to the left, 2m to the right, and then 9m to the left.What is the total distance, and the total displacement of John after all these movements.
Answers
Answer: Total Distance: 27 meters
Displacement: -3 meters or 3 meters to the left.
Explanation: Total distance means the total distance John traveled. In this case we can add up all the movements he made. This would be:
10+6+2+9 = 27 meters.
Displacement is the distance from the starting point after all the steps. The best way to think of this is moving left as negative and right as positive. This means
10 - 6 + 2 - 9 = -3 meters.
This means from his original starting point, he is 3 meters from the left of it after all the movements.
Hope this helped!
A person exerts 12.0 N on a 0.145 kg baseball for 0.480 s. What is the change in velocity of the base ball?
Answers
The change in velocity of the baseball is 39.72 m/s
What is change in velocity?
This is the difference between the final and the initial velocity of a body.
To calculate the change in velocity of the ball, we use the formula below.
Formula:Ft = mΔv.............. Equation 1Where:
F = Force exerted by the persont = timem = mass of the baseballΔv = Change in velocity.Make Δv the subject of the equation
Δv = Ft/m........... Equation 2From the question,
Given:
F = 12 Nt = 0.480 sm = 0.145 kgSubstitute these values into equation 2
Δv = (12×0.48)/0.145Δv = 39.72 m/s.Hence, The change in velocity of the baseball is 39.72 m/s
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At the exact same instant that a
ball is thrown horizontally (in a
projectile) another identical ball
is dropped straight down from
the same height. Which ball hits
the ground first?
Answers
Answer:
The ball being thrown straight down.
Explanation:
The downforce and gravitational pull of the ball going down will give it
a higher velocity compared to the one trown horizontially it will take some time for it to catch downforce speed and reach the same velocity.
please help me out with this.
Answers
To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.
First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:
1/Req = 1/R1 + 1/R2 + 1/R3
Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:
1/Req = 1/22 + 1/22 + 1/22
1/Req = 3/22
Taking the reciprocal of both sides, we find:
Req = 22/3 Ω
Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:
I = V/R
Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:
I = 1.1/32
Calculating this value, we find:
I ≈ 0.034375 A
Therefore, the current in the resistor is approximately 0.034375 A.
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lamp power with what is the current through the lamp when it is connected to a battery ?
Answers
Answer:
lamp power with what is the current through the lamp when it is connected to a battery ?
Explanation:
If the light bulbs are connected in parallel, the current flowing through the light bulbs combine to form the current flowing in the battery, while the voltage drop is 6.0 V across each bulb and they all glow. One bulb burning out in a series circuit breaks the circuit.
Every time you inhale, oxygen makes its way to millions of tiny, sponge like sacs called ______that line the walls of your lungs.
Popliteal
Arterial
Alveoli
Capillaries
Answers
Every time you inhale, oxygen makes its way to millions of tiny, sponge like sacs called alveoli that line the walls of your lungs.
Lungs :Your lungs contain tiny, balloon-shaped air sacs called alveoli. Moving oxygen and carbon dioxide (CO2) molecules into and out of your bloodstream is what the alveoli are there for. Alveoli are a crucial component of your respiratory system, which includes the body parts that aid in breathing.
What lines walls of alveoli?An alveolus is made up of an extracellular matrix encircled by capillaries, a layer of simple squamous epithelium (extremely thin, flattened cells), and an epithelial layer. The alveolar membrane, also known as the respiratory membrane, which permits the exchange of gases, includes the epithelial lining.
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5. A truck starts from rest and rolls down a hill with a constant It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg.)
Answers
The acceleration of a body can be calculated using the following equation:
s = ut + ½at²
Where;
S = distanceu = initial velocityt = timea = acceleration400 = 0 × 20 + ½ × a × 20²
400 = 0 + 200a
a = 2m/s²
Force acting on the truck can be calculated by multiplying the mass of the truck by its acceleration as follows:
Force = 7000kg × 2m/s²
Force = 14,000N
Therefore;
the acceleration of the truck that starts from rest and rolls down a hill with a distance of 400m in 20s is 2m/s².The force acting on the truck if it's mass is 7 tonnes is 14,000N.Learn more about acceleration at: https://brainly.com/question/12550364
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similarities eukaryotic and prokaryotic cells
Answers
Answer:v
Both prokaryotic and eukaryotic cells have similar features, like ribosomes, genetic material, a cytoplasm, and plasma membranes. There are two primary types of eukaryotic cells: animal and plant cells.
Explanation:
What is the acceleration of a car that travels in a straight line at a constant speed of 100 km/h?
Answers
Answer: ZERO
Explanation:
zero
The acceleration of a car that travels in a straight line at a constant speed of 100 km/h is zero. Average acceleration = (change in velocity)/(time it takes). Since the car's change in velocity is zero, its acceleration is zero.
THANK YOU and have a great night!
at a temperature of 10 c,700 ml of hydrogen is collected. if this gas is put into a 1000 ml container what will its new temperature be in celsius?
Answers
Answer:
14.3°C
Explanation:
Find the ratio of 10°C : 700ml then use the same ratio to 1000ml.
Have a great day <3
Answer:
smh.
Explanation:
What is the impulse experienced by a 24kg dog as he speeds up from 2m/s to 6m/s
Answers
Given
m = 24kg
vi = 2 m/s
vf = 6 m/s
Procedure
Impulse = Change in momentum
\(\begin{gathered} I=m\Delta v \\ I=m(v_f-v_i) \\ I=24\cdot(6-2) \\ I=96\operatorname{kg}m/s \end{gathered}\)The answer would be I = 96 kg*m/s
How do you drink water
Answers
Answer:
lift up the cup and you drink the water
Answer: First, acquire/get a cup, then acquire/get a water bottle, then pour water in the cup, and lastly put the cups round lip to your lips and pour into your mouth... Hope it helps...
The resistance to the motion of an object is
Answers
Answer:
Inertia
Explanation:
Part of Newton's Laws of Motion
What is the weight of a 328N emperor penguin?
Answers
Answer:
Weight = 3217.68
Explanation:
N times Gravity = weight
Gravity= 9.81
The weight of the emperor penguin whose mass is 328 Kg on is 3214.4 Newtons.
What is Weight ?
Weight is the force exerted by the earth on an object at the surface of the earth. Mathematically -
W = m x g
where -
[m] is the mass of object
[g] is acceleration due to gravity
Given is the mass of an emperor penguin as 328 Kg.
We can write -
Mass [m] = 328 kg
Acceleration due to gravity [g] = 9.8 m/s²
Therefore, the weight of the emperor penguin will be
W[P] = m x g = 328 x 9.8 = 3214.4 Newtons
Hence, the weight of the emperor penguin whose mass is 328 Kg on is 3214.4 Newtons
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The velocity – time graph of an object moving along a straight line is shown in
fig. Find (a) the distance covered and (b) the displacement of the object in time
interval between t = 0 s and t = 10 s
Answers
(a) The distance travelled by the object is 100 m.
(b) The displacement of the object in time interval between t = 0 s and t = 10 s is 60 m.
What is the distance covered by the object?(a) The distance travelled by the object is calculated from the total area of the curve.
total distance = area of triangle 1 + area of triangle 2 + area of rectangle.
total distance = (¹/₂ x base x height)₁ + (¹/₂ x base x height)₂ + length x width
total distance = (¹/₂ x 6 s x 20 m/s) + (¹/₂ (8 - 6) 20) + (10 - 0)(10 - 8)
total distance = 60 m + 20 m + 20 m
total distance = 100 m
(b) The displacement of the object in time interval between t = 0 s and t = 10 s is calculated as follows;
displacement = final position - initial position
displacement = (¹/₂ x base x height)₁ + (¹/₂ x base x height)₂ + length x width
displacement = (¹/₂ x 6 s x 20 m/s) + (¹/₂ (8 - 6) (-20)) + (10 - 0)(10 - 8)
displacement = 60 m - 20 m + 20 m = 60 m
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increasing the diameter of a telescope i. increases its light gathering power. ii. increases its resolving power. iii. increases it magnifying power. iv. increases its chromatic aberration.
Answers
Yes, a telescope's diameter can be increased to achieve all of these results.
The telescope can gather more light by expanding its diameter, which makes it simpler to observe faint objects. The telescope's resolving power is also improved by the larger diameter, which enables it to resolve minute details with greater accuracy. The telescope can create images with higher levels of magnification with more light and better resolving power. As a result of different light wavelengths being focused at different spots, chromatic aberration—which is another effect of greater diameter—can also rise.
An optical device called a telescope is used to magnify distant objects, enabling us to view distant galaxies, planets, stars, and other astronomical objects. In order to gather light and create an image, telescopes come in a wide variety of sizes and designs and employ a variety of lenses and mirrors. Terrestrial items like birds and trees can also be seen through telescopes. Astronomers and researchers utilise telescopes, as do amateur astronomers who seek to study the night sky.
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Two earth satellites are in parallel orbits with radii 6750 km and 6751 km One day they pass each other, 1 km apart, along a line radially outward from the earth. Part A How long will it be until they are again 1 km apart? Express your answer with the appropriate units. HA ? t Value Units bit Det aner A Review Constants A heat engine extracts 60 kJ of heat from the hot reservoir each cycle and exhausts 35 kJ of heat. What is the thermal efficiency? Express your answer using two significant figures. ΑΣΦ o ? % Submit Request Answer Part B What is the work done per cycle? Express your answer to two significant figures and include the appropriate units μΑ 0 ?
Answers
The two earth satellites are in parallel orbits of differing radii, so they will not always be 1 km apart. Therefore, the time it takes for them to be 1 km apart again will depend on their rate of revolution, which is determined by the time it takes for them to complete one orbit.
To answer Part A, we must calculate the orbital period of each satellite, which is calculated by dividing the circumference of the orbit by the speed of the satellite. Once we calculate the orbital period for each satellite, we can use this information to determine how long it will take for the two satellites to be 1 km apart again.
For Part B, we must calculate the thermal efficiency of the heat engine. This is done by dividing the amount of heat extracted from the hot reservoir (60 kJ) by the amount of heat exhausted (35 kJ). The thermal efficiency is the ratio of these two numbers, and can be expressed as a percentage.
Finally, we must calculate the work done per cycle, which is the difference between the heat extracted and the heat exhausted (60 kJ-35 kJ = 25 kJ). This amount can also be expressed to two significant figures, with the appropriate units.
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Nancy roller skates with a constant speed
of 16 km/h. How long will she take to travel
a distance of 24 kilometers?
Answers
The connections of many simple pieces in the brain is evidence of the:
O A. lobes of the brain
B. brain's complexity
C. function of neurons
D. cerebral cortex
Answers
Hope This Helps ♡
Answer:
B. brain's complexity
Explanation:
Ape.x
a paraboloid is a 3d shape whose cross sections are parabolas. a solar cooker is in the shape of a paraboloid. it generates heat for cooking by reflecting sunlight toward a single point, the common focus of those parabolas. a cross section of the solar cooker can be modeled by the parabola shown below, opening up whose vertex is at the origin. if the cooker is 148 cm wide and 27.38 cm deep, how far above the base is the focal point?
Answers
The focal point of the solar cooker is 6.845 cm above the base.
How to calculate distance?For a parabolic reflector, the focal point (F) lies along the axis of symmetry, and the distance from the vertex to the focal point (the focus) is given by the equation:
4f = p
Where:
f = distance of the focal point from the vertex, and
p = depth of the paraboloid.
Given that the depth of the cooker is 27.38 cm, substitute this into the equation to find the focal point:
4f = 27.38 cm
f = 27.38 cm / 4
f = 6.845 cm
Therefore, the focal point of the solar cooker is 6.845 cm above the base.
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This type of bike tire is thinner, lighter, more expensive, and punctures easily.
Answers
If you have a Corvette with a mass of 1,054 kg and a velocity of 48m/s, find the kinetic energy in J.
Answers
Kinetic energy of Corvette with a mass of 1,054 kg and a velocity of 48m/s is 12,14,208 J
What is kinetic energy?Kinetic energy is a type of power that an item or particle possesses as a result of motion. An object accelerates and acquires kinetic energy when it undertakes work—the transfer of energy—by being subjected to a net force. Kinetic energy is one of the properties of a moving object or particle, which depends on both mass and speed. The type of motion can be any combination of vibration, rotation on an axis, and translation (or transit along a path from one spot to another).
A body's translational kinetic energy is equal to 1/2mv2, or one-half of the product of its mass, m, and square of its velocity, v.
Here,
m = 1,054 kg
v = 48 m/s
KE = ?
KE = 1/2 mv²
KE = \(\frac{1}{2}\) × 1054 × 48²
KE = 0.5 × 1054 × 2304
KE = 12,14,208 J
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What is the value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C?a. 1.6 x 10-7 c b. 2.5 x10-3 cc. 2.8 x 10-3 c d. 3.5 x 101 c
Answers
The value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C is 3.5 x 101 c
The force (F) experienced by a charged particle in an electric field (E) is given by the equation:
F = qE
Where q is the charge of the particle.
In this problem, we are given the force (F) and the electric field (E), and we need to find the value of the charge (q).
Substituting the given values into the equation, we get:
2.4 × 10–3 N = q × 6.8 × 10–5 N/C
Solving for q, we get:
q = (2.4 × 10–3 N) / (6.8 × 10–5 N/C)
q = 3.529 × 10–2 C
Therefore, the value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C is 3.529 × 10–2 C.
The closest answer option is (d) 3.5 x 101 c, which is approximately equal to 3.529 × 10–2 C.
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