Figure 1 shows cavity wall insulation being installed in the wall of a house.
(a) Explain how the wall reduces unwanted energy transfers
Please help asap
Answers
Explanation:
Energy loss through walls can be reduced using cavity wall insulation. This involves blowing insulating material into the gap between the brick and the inside wall, which reduces the loss by air circulating inside the cavity, therefore reducing loss by convection through the cavity.
The cavity wall insulation reduces unwanted energy transfers by reducing the loss by air circulation inside the cavity.
What is meant by heat transfer ?The process by which molecules are transferred from a region of greater temperature to one of lower temperature is known as heat transfer.
Here,
Cavity wall insulation helps to reduce energy loss through walls. In order to limit the loss by convection through the cavity, insulating material is blown into the space between the brick and the inside wall.
This reduces the loss by air circulation inside the cavity. Overall, there is less heat loss conducting via the bricks and hollow; this can be interpreted as less thermal conductivity.
There may not always be a cavity in a wall. Heat is conducted more slowly through thicker barriers than through thinner ones. Because heat moves through materials more slowly the lower their thermal conductivity, the less heat escapes through these solid walls when a material is added to either the interior or exterior.
Hence,
The cavity wall insulation reduces unwanted energy transfers by reducing the loss by air circulation inside the cavity.
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Related Questions
which products rely on the ability of ionic compounds to conduct electricity? check all that apply.
1. papers
2. cell phones
3. soaps
4. glazed pottery
5. remote control toys
Answers
2. Cell phones
5. Remote control toys
Approximately what percentage of the almost 1,500
highway deaths in Pennsylvania each year are
attributed to aggressive driving?
A. 50%
B. 60%
C.70%
D.80%
Answers
Answer:
50% are attributed to aggressive driving
The percentage of the almost 1,500 highway deaths in Pennsylvania each year attributed to aggressive driving will be 50%.
What is aggressive driving?Aggressive driving is defined as any behind-the-wheel activity that, without regard for safety, puts another person (or people) and/or property in danger.
Aggressive driving can vary from potentially dangerous conduct to serious assault.
From the data obtained the percentage of the almost 1,500 highway deaths in Pennsylvania each year attributed to aggressive driving will be 50%.
Hence option A is correct.
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An iron rod with an initial length of 12.64 m has its temperature raised from 9o C to 38.10o C. If iron has a coefficient of thermal expansion of 12x10-6 1/oC, what is the change in length of the rod in mm?
Answers
We will have the following:
First, we remember that:
\(\Delta L=\alpha\ast L_0\ast\Delta T\)So:
\(\begin{gathered} \Delta L=(12\ast10^{-6}1/C)(12.64m)(38.1C-9C)\Rightarrow\Delta L=4.413888\ast10^{-3}m \\ \\ \Rightarrow\Delta L\approx4.41mm \end{gathered}\)So, the change in length of the rod is approximately 4.41 mm.
if we compare light photons and energetic electrons which have constant velocity independent of energy
Answers
Light photons always travel at a constant speed (the speed of light) regardless of their energy, while the velocity of electrons is not constant and can vary with their energy.
Light photons and energetic electrons do not have constant velocities independent of energy. Light photons, which are particles of electromagnetic radiation, travel at a constant speed in a vacuum, which is approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum, denoted as the speed of light (c). This speed is a fundamental constant of nature and remains constant regardless of the energy of the photons. In other words, all photons, regardless of their energy, travel at the same speed in a vacuum.
On the other hand, energetic electrons do not have a constant velocity independent of their energy. According to classical physics, the velocity of an electron can vary depending on its energy. In classical mechanics, the kinetic energy of an object is related to its velocity. However, in the microscopic world of quantum mechanics, the behavior of particles such as electrons is described differently.
In quantum mechanics, the concept of particle velocity becomes less straightforward. Instead of velocity, quantum particles are described by wavefunctions, which represent the probability distribution of finding the particle at a certain location. The wavefunction of an electron evolves over time according to the Schrödinger equation, and it does not directly correspond to a well-defined classical velocity.
However, in certain situations, such as in electron beams or particle accelerators, electrons can be accelerated to high energies. In these cases, the energy of the electrons is related to their speed, but it is not a constant relationship. As the energy of the electrons increases, their speed can also increase, but it is not independent of their energy.
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4. A current of 3.00 A flows through a resistor when it is connected to a
12.0 - V battery. What is the resistance of the resistor?*
2.4 ohms
36 ohms
4 ohms
0.3 ohms
Answers
Answer:
V=IR
12 = 3 ×RESISTANCE
RESISTANCE=12/3
=4 Ohms
answer is the third option
a 0.22 kg clay target is fired at an angle of 35° to the horizontal. it reaches a maximum height of 4.6 m. what is its initial speed when it is launched?
Answers
The initial speed of the clay target can be determined using the principles of projectile motion. To begin, let's consider the vertical motion of the clay target.
At the maximum height, the vertical velocity of the target is zero since it momentarily stops before falling back down. We can use the equation for vertical motion:
v_f² = v_i² + 2 * a * d
where v_f is the final vertical velocity (zero in this case), v_i is the initial vertical velocity, a is the acceleration due to gravity (-9.8 m/s² ), and d is the vertical displacement (4.6 m).
Plugging in the known values, we get:
0 = v_i² + 2 * (-9.8 m/s² ) * 4.6 m
Simplifying the equation, we have: v_i² = 2 * 9.8 m/s² * 4.6 m v_i² = 89.68 m² /s²
Taking the square root of both sides, we find:
v_i = √(89.68 m² /s² ) = 9.46 m/s Now, let's consider the horizontal motion of the clay target. The horizontal velocity remains constant throughout the motion, so we can use the equation:
v_x = v_i * cosθ
where v_x is the horizontal velocity, v_i is the initial velocity, and θ is the launch angle (35°).
Plugging in the known values, we get: v_x = 9.46 m/s * cos(35°) Calculating this, we find: v_x = 9.46 m/s * 0.819 = 7.75 m/s Therefore, the initial speed of the clay target when it is launched is approximately 7.75 m/s.
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Fundamentally, pressure is defined as force per unit area. What is the source of the force in a gas sample? A) The force is from gravity acting on the particles. B) The force is composed of the sum of the collisions only between gas molecules. C) The force is composed of the sum of the collisions only between the gas molecules and the container. D) The force is composed of the sum of all collisions--between the gas molecules, each other and the container. E) The force was imparted to the container in its initial filling, a transfer of momentum.
Answers
Answer:
Option C
Explanation:
Given
Pressure = Force /Area
For any gas sample, force is defined as basically the force exerted by the gas molecules when they strike the surface (with in which they are contained) and bounce back.
Hence, Option C is the correct
There is a box on the floor. The following forces are being applied to it:
There is 25 N of gravitational force
* There is 50 N of applied force
* There is 100 N of normal force
* There is 40 N of friction force
The horizontal force applied to it is _N
Your answer
Answers
The answer is 6.
Add 4 then divide 2. You should have 18 after you do that, subtract 10 then multiply 20. You then have 6.
Answer:
maneeee , i just need a couple points so ..
Explanation:
hehee , played yall
Calcular la aceleración que produce una fuerza de 40 N sobre un cuerpo con 88 Kg de masa. Expresar el resultado en m⁄s^2 *
Answers
Answer:
a = 0.45 m/s²
Explanation:
The given question is ''Calculate the acceleration that produces a force of 40 N on a body with 88 kg of mass".
Given that,
Force, F = 40 N
Mass of the body, m = 88 kg
The net force acting on the body is given by :
F = ma
Where
a is the acceleration of the body
\(a=\dfrac{F}{m}\\\\a=\dfrac{40\ N}{88\ kg}\\\\a=0.45\ m/s^2\)
So, the required acceleration is 0.45 m/s².
A soccer player kicks a ball with initial velocity of 10m/s at an angle of 30 degrees above the horizontal.....what is the magnitude of the vector
Answers
Answer: 10m/s^2
Explanation:
Given the following :
Initial Velocity(U) = 10m/s
Angle of inclination = 30°
In other to calculate the magnitude of the vector,
We need to resolve into verti AL and horizontal component.
Vertical component of a vector(Uy) = U × Sinθ
Horizontal component(Ux) = U × Cosθ
Uy = 10 × sin30 = 10 × 0.5 = 5m/s
Ux = 10 × Cos30 = 10 × 0.866 = 8.66m/s
Therefore the magnitude equals :
U = √(Uy)^2 + (Ux)^2
U = √5^2 + 8.66^2
U = √25 + 74.9956
U = √99.9956
U = 9.9997799
U = 10m/s^2
Give one example of an object that is accelerating
Answers
Answer:
The only answer that i could think of:
A falling body
Answer:
a sky diver that just jumped out of a plane
or a car that just had the light turn green
or an apple droped from a tree
or a sled sliding down a hill
Explanation:
all of these objects would be acclerating
the skydiver and apple would be acclerating from 0 at a rate of 9.8m/s^2
Hope this helps! :)
In electric motors and electric generators, which part is responsible for transferring current from the power source to the commutator or from the slip rings to where the electricity is needed? armature brush axle magnet
Answers
Answer:
brush
Explanation:
its correct
Answer:
B. Brush
Explanation:
Edg 2021
ram takes 2 minutes to cover a distance of 600 meter. calculate his speed
Answers
2 minutes in seconds is 120, so
600/120= 5 m/s
PLS HELP MEH!!!!
Sound travels fastest in
a) air
b) water
c) glass
d) diamond
WILL MARK BRAINLIEST IF ANSWER
Answers
Answer:
hope this helps
Explanation:
Of the three phases of matter (gas, liquid, and solid), sound waves travel the slowest through gases, faster through liquids, and fastest through solids
so your answer would be B.
the transfer of thermal energy between particles of matter that are in contact with each other is called thermal _________.
Answers
Answer:
Hello There!!
Explanation:
The answer is=>Conduction.
hope this helps,have a great day!!
~Pinky~
\(\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}\)
Conduction.
thanksHope it helps.Two identical baseballs are thrown with the same speed toward home plate. Ball A is spinning rapidly as it travels. Ball B is not spinning as it travels. (a) Which ball has more total mechanical energy? Explain (b) Which ball requires more work to throw? Explain
(c) If a pitcher Wants t0 throw two balls-one spinning and one not-that require the same amount of work to throw; which will travel faster toward home plate? Explain
Answers
If a pitcher wants to throw two balls requiring the same amount of work to throw, the ball without spin (Ball B) will travel faster toward home plate.
(a) Ball A, which is spinning rapidly, has more total mechanical energy because rotational kinetic energy is added to its translational kinetic energy. The spin contributes to the overall energy of the ball.
(b) Ball A, which is spinning rapidly, requires more work to throw because the rotational motion adds an additional component of kinetic energy that needs to be provided by the pitcher.
(c) If a pitcher wants to throw two balls requiring the same amount of work to throw, the ball without spin (Ball B) will travel faster toward home plate. This is because the absence of spin allows for better aerodynamic efficiency, reducing air resistance and allowing the ball to maintain higher translational speed.
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a pumpkin is dropped from a 35 m building. what is its initial velocity
Answers
Answer:
26.2 mps
Explanation:
A 1.5 kg mass attached to an ideal spring oscillates horizonatlly with an amplitude of 0.30 m. The spring constant is 85 N/m. What is the period of the mass's motion?
Answers
Answer:
T = 0.83 seconds
Explanation:
Given that,
The mass attached to the spring, m = 1.5 kg
The amplitude of the spring, A = 0.3 m
The spring constant of the spring, k = 85 N/m
We need to find the period of the mass's motion. The time period in spring mass system is given by :
\(T=2\pi \sqrt{\dfrac{m}{k}} \\\\T=2\pi \sqrt{\dfrac{1.5}{85}} \\\\T=0.83\ s\)
So, the period of the mass's motion is 0.83 seconds.
A long wire carries a long wire carries a current toward the east in a magnetic field that is directed due south. What is the direction of the magnetic force on the wire? a) west b) north c) east d) vertically upward e) vertically downward
Answers
When a long wire carries a current towards the east in a magnetic field that is directed due south, the direction of the magnetic force on the wire is vertically downward.
The force exerted by a magnetic field on a moving charged particle is described by the Lorentz force equation. The direction of the magnetic force F on a moving charged particle with charge q is given by F = qv x B, where v is the velocity of the particle and B is the magnetic field vector.
The direction of the magnetic force is perpendicular to both the velocity of the particle and the direction of the magnetic field.
If the current in the wire is towards the east and the magnetic field is directed towards the south, then the magnetic force on the wire will be perpendicular to both these directions, which is vertically downward.
Therefore, the correct option is e) vertically downward.
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why energy crisis may create big problem in the near future.
Answers
Answer:
Most energy crises have been caused by localized shortages, wars and market manipulation. Some have argued that government actions like tax hikes, nationalisation of energy companies, and regulation of the energy sector, shift supply and demand of energy away from its economic equilibrium.
the s-wave shadow zone occurs because ____________ .
Answers
The S-wave shadow zone occurs because of the inability of S-waves to pass through the liquid outer core.
What is the S-wave shadow zone?
Seismic waves are waves of energy produced by the sudden breaking of rocks during an earthquake, volcanic eruption, or a man-made explosion.
The three types of seismic waves are:
Primary Waves (P-waves), Secondary Waves (S-waves), and Surface Waves.Seismic waves spread out in all directions, creating a "wavefront" much like the ripples on the surface of a pond after a stone is thrown in it.
The Shadow Zone is a region of the Earth's surface where the primary waves (P-waves) cannot be detected by seismographs, and the secondary waves (S-waves) are reduced in amplitude or completely absent.
S-waves, which can only pass through solid material, do not travel through the liquid outer core because it is molten.
This results in a S-wave shadow zone where seismographs do not detect S-waves, which is between 103 and 143 degrees away from the epicentre.
Therefore, the answer is the option that states "S-waves cannot pass through the liquid outer core."
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If
you weigh 140 pounds, what is your weight in kilograms
Answers
HELP ME PLEASE I need the answer now and I will give all my brain lists
Answers
Answer:
I'd say it's B
Sorry if I get you wrong-
A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 50 m. The acceleration of the cyclist is
A. zero.
B. 8 m/s2, toward the center of the track.
C. 10 m/s2, downward.
D. 20 m/s2, in the direction of travel.
Answers
The correct option is A. zero.
Acceleration is a vector quantity that represents the rate of change of an object's velocity with respect to time. It is a physical quantity that measures how much the speed and/or direction of an object changes per unit time.Acceleration and velocity in circular motion A cyclist races around a circular track at a constant speed of 20 m/s. As the cyclist is moving in a circle, it has a velocity vector that is constantly changing in direction. As a result, the cyclist has an acceleration.The acceleration of an object in circular motion is always directed towards the center of the circle. Because the cyclist is moving in a circle, the direction of the cyclist's acceleration is towards the center of the circle.The magnitude of the acceleration of an object moving in a circle is given by the following equation:a = v2/r where
:a is acceleration is velocity is the radius of the circle For the given cyclist, the speed is given as 20 m/s and the radius of the circular track is 50 m. Using the equation, we geta = (20 m/s)2/50 m= 400/50= 8 m/s2Thus, the acceleration of the cyclist is 8 m/s2, directed towards the center of the circular track.
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element X has two isotopes: X-27 and x-29. x-27 has an atomic mass of 26.975 and a relative abundance of 82.33%, and X-29 has an atomic mass of 29.018 and a relative abundance of 17.67%. calculate the atomic mass of element X. show your work
Answers
Answer:
27.34 (no unit)
Explanation:
26.975*82.33%+29.018*17.67%
=27.34
if you want to measure the electric potential difference, which cables will you use to connect to a multimeter, and where will you plug them in?
Answers
The cable that should be connected to a multimeter in order to measure the electric potential different are two banana cables, the black probe should be plugged into the COM and the red probe into the port marked VΩmA.
The black end of the probe is connected into the COM socket. All meters use this as standard. The red probe lead is plugged into a socket labeled VΩmA, which can be used to measure voltage, resistance, or microamperes. If the socket doesn't say "mA" as described above, there will be one or more separate sockets where the red probe lead can be connected to measure current. The maximum current range for these sockets will be indicated with a "A" or "mA" marking.
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can someone help with just question 1 :)
Answers
What line in the sky is created by our revolution around the Sun?
Answers
Answer:
Ecliptic
Explanation:
You asked for the term that is used to describe Earth going around the sun
The ecliptic is the path the sun, moon, and planets take across the sky as seen from Earth. It best defines the plane of the Earth's orbit around the sun. The imaginary line can best be visualized in the days just before full moon.
Hope it helped
how do you feed a dog medicine
Answers
There are lots more but these are the best
What is the charge of a Sulfur atom if it has 17 electrons?
Answers
Answer:
-1
Explanation:
An atom contains a proton, electron and neutron as subatomic particles. The number of protons, which is the positively charged particle (+) is always equal to the number of electrons, which is the negatively charged particle (-) in A NEUTRALLY CHARGED ATOM i.e. no charge.
However, a decrease or increase in charge is dependent on the number of electrons and protons in that atom. Sulfur atom has an electron number of 16 in its neutral atom, however, when it gains one more electron to become 17, it means that the charge has become -1 because the charge = number of protons - number of electrons i.e. 16 - 17 = -1.