All of the following are examples of heat conduction except
a pressing a shirt with a hot iron.
b warming your hands over a campfire.
C warming your hands by holding a cup of hot
chocolate.
d heating soup in a pan on a stovetop.
Answers
Answer:
b
Explanation:
warming your hands over a campfire is not a example of it conduction because in heat conduction the body which transverse heat into the other bodies should be connected physically in the case of farming our hands over campfire there is no solid connectors our hands are being heated due to the radiation from the camp fire
Related Questions
A 6.6 x 10^3 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.8 degree with the horizontal. An average frictional force of 4.2 x 10^3 N impedes the car's Motion so that the car's speed at the bottom of the driveway is 4.9 m/s. The acceleration of gravity is 9.81 m/s^2 . What is the length of the driveway? Answer in units of m.
Answers
The length of the driveway is 23.8 meter, when the acceleration of gravity is 9.81 m/s^2.
To solve this problem, we need to use the equations of motion and the forces acting on the car. First, we need to find the component of the gravitational force that acts down the slope. This is given by Fg*sin(16.8), where Fg is the force due to gravity.
Next, we can use Newton's second law to find the net force acting on the car: Fnet = ma, where m is the mass of the car and a is its acceleration. The net force is the component of the gravitational force down the slope minus the frictional force:
Fnet = Fg*sin(16.8) - 4.2 x 10^3 = ma
Solving for a, we get a = (Fg*sin(16.8) - 4.2 * 10^3)/m
We can then use the equation of motion that relates displacement, acceleration, and initial velocity to find the length of the driveway:
d = \frac{(v^2 - v0^2)}{(2a) }
Where d is the displacement (length of the driveway), v is the final velocity (4.9 m/s), v0 is the initial velocity (0 m/s), and a is the acceleration we just found.
Plugging in the numbers, we get:
d =\frac{ (4.9^2 - 0^2)}{(2*((6.6 * 10^3)*(9.81)*sin(16.8) - 4.2 * 10^3))} = 23.8 m
Therefore, the length of the driveway is 23.8 meters.
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Identify the primary effect of each situation on capillary forces. Choose one for each of the following.
a. Increasing the surface tension of the liquid
b. Decreasing the contact angle between the liquid and solid surface
c. Increasing the viscosity of the liquid
d. Decreasing the temperature of the liquid
Answers
The primary effect of increasing the surface tension of the liquid is to increase the capillary force. Capillary forces arise due to the combined effects of adhesion and cohesion
When the surface tension of the liquid increases, the capillary rise will increase. It is because the increase in surface tension leads to an increase in the force that pulls the liquid upwards in a tube. is as follows;If you place a capillary tube in a beaker filled with water, the water surface inside the tube rises slightly higher than the level outside the tube.
This rise in water level is called capillary rise. The capillary rise is caused by the attraction between the molecules of the water and the molecules of the glass tube.This attraction is called capillary force or capillary action. The capillary force is due to the combined effect of adhesive and cohesive forces. The adhesive force is the attraction between the molecules of the liquid and the molecules of the solid surface, while the cohesive force is the attraction between the molecules of the liquid.
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what is the failure rate (less than a 2.00) of physics 2048 when taken in the summer?
Answers
The failure rate for Physics 2048 during the summer term cannot be determined without specific data from the institution offering the course.
Failure rates for courses can vary depending on factors such as the institution, instructor, and student population. To provide an accurate percentage, you would need to access data from the specific school or instructor offering Physics 2048 during the summer term.
While it is not possible to provide an exact failure rate without the necessary data, it is generally observed that courses taken during a condensed summer term can be more challenging for some students due to the accelerated pace. This may result in a higher failure rate compared to the same course taken during a regular semester. However, it is essential to emphasize that the actual failure rate depends on the specific circumstances and data of the institution offering the course.
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(20 points) What are wispy looking clouds, usually at high altitudes called?
stratus clouds
nimbus clouds
cirrus clouds
cumulus clouds
Answers
Answer:
the answer is c cirrus clouds
Explanation:
what is the answer for ×^+2×+ with solustion
Answers
the current produced by voltage in a circuit is impeded by
Answers
The current produced by voltage in a circuit is impeded by Electric resistance
Explain what is voltage?When charged electrons (current) are propelled through a conducting loop by the pressure of an electrical circuit's power source, they can complete activities like lighting a lamp. In an essence, voltage represents pressure and is measured in volts.
Why does electricity resist?This is so because resistance arises from the collision of electrons with the conductor's atoms. In this situation, a longer conductor will result in more interactions and more resistance. The area of a conductor's cross-section has an inverse correlation with the conductor's resistance. An electrical circuit's resistance to current flow is measured as electrical resistance. The Greek letter omega () represents the measurement unit for resistance, known as ohms.
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Which is formed from two pieces of different metals stuck together lengthwise?
bimetallic coil
coolant
heat pump
furnace
Answers
The term that is formed from two pieces of different metals stuck together lengthwise is bimetallic coil.
What is a bimetallic coil-A bimetallic coil is an essential component of many temperature control devices. Bimetallic coils are also known as bimetallic strips, and they are made up of two different types of metal bonded together and wound into a coil shape.Bimetallic coils are used to create a temperature-sensitive sensor that can open and close a circuit as temperatures rise or fall. This capability allows bimetallic coils to be used in a variety of devices, including thermostats, heat pumps, and furnace limit switches.The structure of bimetallic coils : A bimetallic strip is made up of two separate metals that are bonded together. These metals have different coefficients of thermal expansion, which means that they expand and contract at different rates as the temperature changes.When the bimetallic coil is exposed to heat, the metal with the lower coefficient of thermal expansion will expand more than the metal with the higher coefficient of thermal expansion.
This causes the bimetallic strip to bend, which can be used to open or close a circuit.In summary, bimetallic coils are temperature-sensitive sensors used to regulate the temperature of devices. The bimetallic coil is formed by bonding two different metals together and winding them into a coil shape.
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A three phase Delta-Star connected transformer has line voltage ratio 33kV: 400V. The CTs on 400V side have current ratio of 1000:5. What is the CT ratio required on 33 kV side? Assume the current on 400V side of transformer to be 1000A. [10] (b) Distance protection scheme in each substation has generally three stepped characteristic with different impedance and time settings. (1) Justify the need for such protection scheme. [4] Explain the stepped characteristic for each zone of protection in brief with a neat schematic diagram. [5] How the operating times are set in this protection scheme for achieving selectivity?
Answers
(a) The required CT ratio on the 33 kV side is 16,500:5.
(b) Stepped characteristics in distance protection schemes provide selective fault isolation, improve system reliability, and accommodate fault types and locations. Operating times are set by adjusting time-current coordination curves for each zone to achieve selectivity.
(a) What is the CT ratio required on the 33 kV side of a Delta-Star connected transformer if the CTs on the 400V side have a current ratio of 1000:5 and the current on the 400V side is 1000A?(b) Justify the need for a stepped characteristic in distance protection schemes and explain the operating times and selectivity achieved in this protection scheme.(a) To calculate the CT ratio required on the 33 kV side, we can use the turns ratio of the transformer and the current ratio on the 400V side. Since the line voltage ratio is 33kV:400V, the turns ratio is 33kV/400V = 82.5.
The CT ratio is determined by the turns ratio multiplied by the current ratio on the 400V side. Therefore, the CT ratio required on the 33 kV side would be 82.5 multiplied by the current ratio of the CTs on the 400V side, which is 1000:5.
So, the CT ratio required on the 33 kV side would be 82.5 * (1000/5) = 16,500:5.
(b) The need for a distance protection scheme with stepped characteristics in each substation arises from the following reasons:
- To provide selective protection: Stepped characteristic settings allow for different zones of protection with varying impedance and time settings. This ensures that only the faulted zone is isolated while maintaining power supply to other unaffected zones.
- To improve system reliability: By providing selective fault isolation, the overall system reliability and stability are improved. The faulted section can be quickly isolated, minimizing the impact on the rest of the network.
- To accommodate fault types and locations: Stepped characteristics allow for different impedance and time settings to cater to various fault types and their locations within the network.
The stepped characteristic for each zone of protection is typically represented by different curves on a time-current coordination diagram. The curves show the impedance seen by the protection relay plotted against the operating time. The diagram may include three zones:
- Zone 1: This zone represents the closest section to the source, typically covering a high impedance range with fast operating times. It aims to quickly isolate faults close to the substation to minimize damage and improve system stability.
- Zone 2: This zone covers a medium impedance range and slightly longer operating times compared to Zone 1. It provides backup protection to the adjacent sections of the network and helps isolate faults beyond Zone 1.
- Zone 3: This zone covers a higher impedance range and longer operating times compared to Zone 2. It provides additional backup protection to cover faults farther from the substation and offers protection for the entire network.
The operating times in this protection scheme are set by adjusting the time-current coordination curves for each zone. The settings are based on factors such as the distance to the fault, fault types, fault current levels, and system requirements. By carefully coordinating the curves, selectivity is achieved, ensuring that the protection relays closest to the fault operate faster than those farther away. This allows for fault isolation and system stability while minimizing unnecessary tripping for faults outside the protected zone.
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How does an inclined plane increase force?
Answers
Acceleration will increase as the angle of incline does, and as a result, force will as well.
The gravitational force acting on the cart increases as the slope of the incline increases, causing it to accelerate more quickly.The ramp's steepness will cause an increase in inclination. As a result, the acceleration increases as the inclination angle increases. This acceleration causes the object to descend with greater speed.
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A. )How is Coulomb’s law similar to Newton’s law of gravitation? How is it different?
B. )How does a coulomb of charge compare with the charge of a single electron?
C. )How does the magnitude of electrical force between a pair of charged particles change when the particles are moved twice as far apart? Three times as far apart?
D. )How does an electrically polarized object differ from an electrically charged object?
Answers
A. Coulomb's law and Newton's law of gravitation are similar in that they both describe the forces between objects. However, they differ in the type of force they describe. Coulomb's law relates to the electrostatic force between charged particles, while Newton's law of gravitation describes the gravitational force between two objects with mass.
B. A coulomb of charge is equal to the charge possessed by approximately 6.24 x 10^18 electrons. This means that a single electron carries a charge of 1.6 x 10^-19 coulombs. C. The magnitude of the electrical force between charged particles decreases when the particles are moved farther apart. If the particles are moved twice as far apart, the magnitude of the force decreases by a factor of 4 (1/2^2). If the particles are moved three times as far apart, the magnitude of the force decreases by a factor of 9 (1/3^2). D. An electrically polarized object differs from an electrically charged object in that polarization refers to the redistribution of charges within a neutral object under the influence of an external electric field. In an electrically polarized object, the charges shift, resulting in a separation of positive and negative charges. However, the object as a whole remains neutral. In contrast, an electrically charged object has a net surplus or deficit of electrons, leading to an overall positive or negative charge.
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a stone is dropped from the top of a tower 400 m high and at the same time another stone is projected upward vertically from the ground with a velocity of 100 m/s. find where and when the two stones will meet.
Answers
Answer:The stones will be at the same height of 62.59 feets 4.4 seconds later.
Explanation:
3000 centímetros cúbicos de un gas ideal a 80°C se expande hasta un volumen de 1000 cm³ a presión constante. ¿Cuál es la temperatura final?
Answers
Responder:
117,6 K
Explicación:
Dado :
V1 = 3000 cm³
T1 = 80 ° C = 273 + 80 = 353 K
V2 = 1000 cm³
T2 =?
La ley de Fromm Charles;
3000/353 = 1000 / T2
3000T2 = 353 * 1000
T2 = 353000/3000
T2 = 117. 67 k
77. The first law of motion applies to
a. Only objects that are moving
b. Only objects that are not moving
C. All objects whether moving or not
No obiect, whether moving or not
Answers
Which other subatomic particle has the same mass as a neutron
Answers
Answer:
.................... protons :)
Answer:
protons
The two subatomic particles that have the same mass are protons and neutrons.
Mutations in sections of DNA can be caused by all of the following EXCEPT
Question 2 options:
Viruses
Chemicals
Ultraviolet Radiation
Sexual Reproduction
Answers
Answer:
sexual reproduction
Explanation:
ignore air resistance. what is the momentum of the ball after 0.2 s? (do this problem by finding the components of the momentum first, and then constructing the magnitude and direction of the momentum vector from the components.)
Answers
The momentum of the ball after 0.2 s is 150.
We are to find the momentum of the ball after 0.2s, ignoring air resistance. Given, Initial velocity of the ball, u = 150 m/s
Time after which momentum is to be found, t = 0.2s
Components of velocity, Vx = u = 150 m/sVy = 0 m/s
We know that, momentum (p) = mass (m) × velocity (v)Where, mass (m) = 1 kg (given)
velocity (v) = √ (Vx² + Vy²)
Momentum (p) = 1 × √ (150² + 0²) = 1 × 150 = 150
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An apple is thrown across the cafeteria with a force of 10 N and at an acceleration of 6 m/s2. What is the mass of the apple? ... please answer asap
Answers
Answer:
Explanation:
F = m * a
The apple's acceleration is not influenced by the acceleration due to gravity for this question. In real life it most certainly is influenced by gravity.
F = m * a
F = 10 Newtons.
a = 6 m/s^2
m = 10/6 = 1.66 kg. Mighty large apple
Which of the following provide electrical resistance in a simple circuit? *
a battery
a wall outlet
a voltage source
a light bulb
Answers
Answer:
A light bulb
Explanation:
Sorry of it wrong
6. I ran 12.2 km in 1.4 hours. Then I ran another 19.3 km uphill in 2.2 hours. What was my average speed?
Answers
Answer: 8.75 km/hr
Explanation:
Concept to know
Average speed: total distance/total time
-------------------------------------------------------
total distance/total time
=(12.2+19.3)/(1.4+2.2) ⇔ add the numbers of two time running together
=31.5/3.6 ⇔ simplify
=8.75 km/hr
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Difficulty 2 Level: Starting with the setup shown below, add up to two additional charges to obtain a goal without leaving the screen. Start Reset Tries: 0 o Pause Clear Puck ls Posnve o Trace Field Antalias Practice Drnouty 1 2 3 charges: 3 Mass
Answers
To obtain the desired goal without leaving the screen, you can add one additional positive charge.
How can adding one positive charge achieve the goal without leaving the screen?By adding one positive charge, we can create an electric field that will influence the movement of the puck. Since the existing charges are positive, adding another positive charge will reinforce the existing electric field, resulting in a stronger force on the puck. This can be achieved by placing the additional charge either above or below the existing charges, depending on the desired direction of movement for the puck.
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The model shows how the Sun fuses two nuclei of hellum-3 into beryllium-6. Since beryllium-6 is unstable, it will decay into smaller nuclei.
What additional product completes the model?
O A Helium-4
OB Helium-8
o C Carbon-4
OD Carbon-8
Answers
Answer:
A
Explanation:
I took the test
they were pleased by the news.(active voice)
Answers
Answer:
They were pleased by the news. (passive voice)
The news pleased them. (active voice)
another term for melting
Answers
Answer:
Fusion in scientific term
If you told a policeman about a car traveling 44.704 m/s (100 mph) that was traveling in an eastward direction, you would be describing the car's ___.
Answers
Answer:
Velocity
Explanation:
You would be describing the velocity of the car.
Velocity in physics is defined as Vector quantity that describes the displacement of an object with respect to the time it takes to attain it. Displacement is the addition of direction to the speed of an object. The displacement is noted in the question, "traveling eastward". While it is stated that the car travels at 44.704 m/s. Ordinarily, it would have been tagged speed, if not for the direction added to it which makes it velocity.
I hope you understand.
Imagine that you could increase the gravitational force on Earth to 200% its current force. What would life be like?
Be sure to answer these questions in your response:
• How would your weight change?
• What challenges would this increase cause?
• What benefits would this increase bring about?
• Would you choose to keep the gravity increase? Why or why not?
(100 POINTSS, ASAP PLS!)
Answers
Answer:
You weight would be doubled because gravitational force is doubled
2. Challenges:
a. Everyone’s body would have to adjust to the new weight and learn to walk again
b. Earth would be closer to the sun, so everything would be hotter on Earth
c. Flying airplanes and driving cars might no longer work at all (talk about how difficult this would make traveling)
3. Benefits:
a. Time would go by much slower so technically everyone would live longer
b. Balloons wouldn’t fly off anymore
4. You have to decide for yourself if you’d like it better or worse
Explanation:
what is the formula for converting frequency to approximate wavelength in meters?
Answers
The formula for converting frequency (f) to approximate wavelength (λ) in meters is given by:
λ ≈ c / f
where:
λ is the wavelength in meters,
c is the speed of light in meters per second (approximately 3 x 10^8 m/s), and
f is the frequency in hertz (Hz).
This formula relates the wavelength of a wave to its frequency and the speed at which the wave propagates. The speed of light in a vacuum is a constant value, so as the frequency increases, the wavelength decreases, and vice versa.
It's important to note that this formula provides an approximation and assumes that the wave is traveling through a vacuum or a medium with a constant refractive index. In different mediums, the speed of light may vary, which would affect the precise relationship between frequency and wavelength.
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what properties of metals do the terms conductivity and ductility describe
Answers
Conductivity and ductility are properties of metals that determine their ability to conduct electricity and be molded into different shapes, respectively.
Conductivity refers to a metal's ability to conduct electricity. Metals are known for their high conductivity, meaning they allow electricity to flow through them easily. This property is due to the fact that metals have free electrons in their outer shell, which are free to move and carry an electrical charge. The conductivity of a metal can be affected by its temperature and impurities, as well as its atomic structure. Ductility, on the other hand, refers to a metal's ability to be stretched or drawn into a wire without breaking. This property is due to the way the atoms in a metal are arranged and the way they interact with each other. Ductile metals are malleable, meaning they can be bent, shaped, and molded without breaking. Metals with high ductility are ideal for shaping into wire, pipes, and other products that require flexibility and strength. In summary, conductivity and ductility are important properties of metals that determine their ability to conduct electricity and be shaped into various forms.
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at what height above the ground must a body of mass 10kg be situated in order to have potential energy equal in value to the kinetic energy possessed by another body of mass 10 kg moving with a velocity of 10 ms-1
Answers
Answer:
The body must have to be situated at a height 5.10 m.
Explanation:
The body of mass 10 kg must be situated at a height of approximately 51.02 meters above the ground.
What is conservation of energy principle?The conservation of energy principle states that the total energy of a system is constant. In this case, we can equate the potential energy of the first body to the kinetic energy of the second body, as follows:
Potential energy = Kinetic energy
\(mgh = 1/2 mv^2\)
where m is the mass of each body, g is the acceleration due to gravity, h is the height above the ground, and v is the velocity of the second body.
Substituting the given values, we get:
\(10 kg * g * h = 1/2 * 10 kg * (10 m/s)^2\)
Simplifying this equation, we get:
\(h = (1/2 * v^2) / g\\h = (1/2 * 10 m/s * 10 m/s) / 9.81 m/s^2\\h = 51.02 meters\)
Therefore, the body of mass 10 kg must be situated at a height of approximately 51.02 meters above the ground to have potential energy equal in value to the kinetic energy possessed by the other body of mass 10 kg moving with a velocity of 10 m/s.
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Show by dimension that the equation of motion is correct
V² = U²+2as
Answers
Answer:
i think its 56as
Explanation:
Tariah is riding on her bike at 4m/s (North). If she accelerates at a rate of 1.5 m/s^2 for 2 s, what is her final velocity?
Answers
ANSWER:
7 m/s
STEP-BY-STEP EXPLANATION:
Given:
Initial velocity (u) = 4 m/s
Acceleration (a) = 1.5 m/s^2
Time (t) = 2 s
We can calculate the final velocity using the following formula:
\(v=u+a\cdot t\)We replace and calculate the value of the final velocity:
\(\begin{gathered} v=4+2\cdot1.5 \\ v=4+3 \\ v=7\text{ m/s} \end{gathered}\)The final velocity is equal to 7 m/s.