Heat can be transferred from one material to another by direct touch, by differences in density in a fluid, and by ______ conduction convection temperature difference radiation
Heat can be transferred from one material to another by direct touch, by differences in density in a fluid, and by conduction.
What is conduction?
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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a person standing on a canoe throws a cement block over the side. the action force on the cement block is 60 N. The reaction force is on the person and canoe. Their total mass is 100 kg. What is their acceleration?
Why does light refract or bend when going through glass or water
Answer: change in velocity of light at the boundary between two media.
Explanation:
The speed of light changes at the air-glass or air-water boundary. The speed of light in air is different from the speed of light in glass or water. Hence, as light approaches the interface of the two media, its speed changes accordingly thereby causing the light rays to bend at the interface of the two media. This bending of light is called refraction.
assuming that the substances have the same mass and are heated by the same amount, which of the following substances would heat up the fastest?
a. copper
b. aluminum
c. gold
d. iron
Final answer:
The substance with the lowest specific heat will heat up the fastest. (option C) Gold would heat up the fastest among copper, aluminum, gold, and iron.
Explanation:
In this case, the substance with the lowest specific heat will heat up the fastest when subjected to the same amount of heat. Specific heat is the amount of heat needed to raise the temperature of a given mass of a substance by 1 degree Celsius. So, the substance with the smallest specific heat value will heat up faster.
Based on their specific heat values, copper has a specific heat of 0.39 J/g °C, aluminum has a specific heat of 0.897 J/g °C, gold has a specific heat of 0.129 J/g °C, and iron has a specific heat of 0.449 J/g °C. Therefore, gold would heat up the fastest among these substances.
In summary, considering substances with the same mass and heated by the same amount, (option C) gold would heat up the fastest.
As the puck falls Its Kinetic energy A. Stays the same B. Increases C. Decreases
As the puck falls, its kinetic energy increases. Therefore, the correct statement is option B.
What is law of conservation of energy?As the puck falls, its kinetic energy increases. This is due to the conversion of potential energy (stored energy due to the puck's position above the ground) into kinetic energy (energy of motion). As the puck falls, it gains speed and its kinetic energy increases.
Kinetic energy is the energy of motion that an object possesses. According to law of conservation of energy, energy cannot be created or destroyed, it can only be transferred from one form to another. As the puck falls, its kinetic energy increases due to the conversion of potential energy into kinetic energy (energy of motion).
As the puck falls, it gains speed and its kinetic energy increases. Therefore, as the puck falls and gains kinetic energy, an equivalent amount of potential energy is lost.
Therefore, when the puck falls, kinetic energy is increased.
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What is the quantity of heat that is released when 27.9 g of H2O condenses? Use mc021-2.jpg. 60.00 kJ 61.05 kJ 63.09 kJ 68.60 kJ
which part of the circulatory system is responsible for exchanging nutrients and waste
If you purchase four 750 gram jars of table salt (NaCl) and dump them all onto 1,000 kg of snow, how much would the freezing point be lowered after all of the salt has dissolved?
Final answer:
When dissolving table salt in snow, the freezing point depression can be calculated based on the number of ions formed. By converting the mass of the salt to moles and considering ion dissociation, the freezing point depression can be determined.
Explanation:
The freezing point depression of a solution can be calculated by considering the number of ions formed upon dissolving the salt in water. In this case, if you dissolve four 750 gram jars of table salt (NaCl) on 1000 kg of snow, the total mass of salt would be 3000 grams. Converting this to moles and considering the dissociation of NaCl into Na+ and Cl-, you can calculate the freezing point depression using the formula provided.
Alexandra decides to climb Mt. Krumpett, which is 5000 m high. She determines that this will require a total of 1350 kcal of energy for the trip. For her food supply, she decides to take nutrition bars. The label states that each bar contains 50 g of carbohydrates, 10 g of fat, and 40 g of protein. How many nutrition bars does Alexandra need to take with her?
Alexandra needs to take 3 nutrition bars with her for the trip.
Explanation:To calculate the number of nutrition bars Alexandra needs to take with her, we need to determine the total energy provided by each bar. According to the label, each bar contains 50 g of carbohydrates, 10 g of fat, and 40 g of protein. To calculate the energy content, we can multiply the amount of each nutrient by the energy value per gram. Carbohydrates and proteins provide 4 kilocalories (kcal) per gram, while fats provide 9 kcal per gram.
Energy from carbohydrates: 50 g * 4 kcal/g = 200 kcal
Energy from fat: 10 g * 9 kcal/g = 90 kcal
Energy from protein: 40 g * 4 kcal/g = 160 kcal
Total energy per nutrition bar: 200 kcal + 90 kcal + 160 kcal = 450 kcal
To determine the number of bars Alexandra needs, we can divide the total energy required for the trip (1350 kcal) by the energy provided by each bar.
Number of nutrition bars needed: 1350 kcal / 450 kcal/bar = 3 bars
78.00 moles of hydrogen are added to 78.00 moles of oxygen to form water. what is the limiting reactant? what is the theoretical yield of water?
Answer:
Actual yield
Explanation:
just did it on edg.
The National Environmental Policy Act was established in 1965. True or false
How much salt is in 300 g of a 3.5 % solution of salt water?
rubbing alcohol contains 60.0%C, 13.4%H, and 26.6%O. what is the molecular formula of rubbing alcohol if its molecular mass is 60.11g/mol?
The molecular formula of rubbing alcohol is C2H5O.
Explanation:The molecular formula of rubbing alcohol, given its percentage composition, is C2H6O. The molecular mass of rubbing alcohol is 60.11 g/mol. To determine the molecular formula, we need to find the empirical formula first. The empirical formula of rubbing alcohol is CH3O. Finally, we can calculate the ratio between the molecular formula mass and the empirical formula mass to obtain the molecular formula of rubbing alcohol: (60.11 g/mol) / (32.04 g/mol) = 1.874. So, the molecular formula of rubbing alcohol is approximately C1.874H4.621O1.874. Since we can't have fractional subscripts in a molecular formula, we can round the subscripts to give the final molecular formula, which is C2H5O.
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An engineer is designing a process to cool hot water from a power plant before returning the water to the environment. His plan is to allow the hot water to flow past a pipe containing a solution that is undergoing a chemical reaction. The chemical reaction will be able to remove some of the water's heat through the metal pipe. Which of the following reactions could take place inside the cooling pipe to remove heat from the hot water? A. C + O2 → CO2 + heat B. CaCl2 → Ca2+ + 2Cl- + heat C. NH4Cl + heat → NH4+ + Cl- D. N2 + 3H2 → 2NH3 + heat
Answer:
Explanation:
Just look at the photo it will tell you the answer it’s the explanation from study Island
Identify a situation in which you would want to have a high resistance and a situation in which youwould want to have a low resistance
Final answer:
In physics, high resistance is essential for safety in insulators, such as those for power lines, to prevent current leakage, while low resistance is desired in electrical wiring for devices to ensure minimal energy loss and efficient power transmission.
Explanation:
In the realm of physics, scenarios necessitate the use of different resistance levels based on the desired outcome. A situation in which you would want to have a high resistance is an insulator for power lines. These ceramic insulators have resistances of 1012 ohms or more to prevent electrical currents from leaking away from the power lines. On the other hand, a situation where you would want a low resistance is in electrical wiring that powers devices. For example, a large-diameter copper wire which may have a resistance of 10-5 ohms, allowing electricity to flow with minimal energy loss.
Additionally, resistors control current flow in circuits; a huge increase in resistance will reduce current, while a huge decrease in resistance increases current flow. Considering safety, a person working around possible electric hazards would want high resistance insulation to protect against electrical injuries; a resistor shown with a resistance of 20 × 105 ohms is an example of a protective measure.
What requires more energy: Raising the temperature of 20 g of iron (specific heat = 0.412 J/g/K) by 10 K or raising the temperature of 15 g of gold (specific heat = 0.129 J/g/K) by 15 K ?
help help help
A 25-kg child sits at the top of a 4-meter slide. After sliding down, the child is traveling at 5 m/s. How much PE does he start with? How much KE does he end with? How much energy is lost to friction?
Enter your answer in the space provided.
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This diagram would represent the enthalpy changes in which of the following?
cold pack
hot pack
melting solid
boiling liquid
Answer is definitely HOT PACK. I just took the test!
1) what causes the magnetic fields on the sun?
2) describe sunspots.
3) describe solar flares.
4) describe solar prominence's.
5) describe coronal holes.
2. Sunspots can be defined as the cooler part of the sun which appears dark at the sun's surface.
3. flares can be defined as those sudden flash of light generated by the sun which contains high energy photons and particles.
4. Solar prominence is defined as a phenomena that occurs in the sun which are glowing clouds that contain hot ionized gases.
5. Coronal hole is defined as a region located at the Corona of the sun which is characterized to be less dense and is cooler than its surrounding.
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Which of the following is a scalar? (1)centripetal force (2)weight (3)speed (4)acceleation
Answer:
The correct answer is option 3.
Explanation:
Scalar quantity is the quantity with magnitude but no direction.
For example : mass, speed etc.
Vector quantity is the quantity with magnitude along with the direction.
For example : velocity, acceleration etc.
Speed is a scalar quantity as it does not have any direction but only magnitude.
Where as :
Centripetal force and weight is type of force. A force is generally a product of mass and acceleration of the object. And as we know that acceleration depends upon velocity of the object which is vector quantity. Hence, it will be correct to say that centripetal force is a vector quantity.
Weight and acceleration are also vector quantities.
A car dives a constant speed of 65mph how far it traveled in 4 hours
Answer:
The car traveled 260 miles in 4 hours.
Explanation:
Speed of the car = S = 65 mile/hr
Duration of time when the car was at speed S = T = 4 hours
Distance covered by car in T time = D
[tex]Speed=\frac{Distance}{Time}[/tex]
[tex]Distance = Speed\times Time[/tex]
[tex]D=65 mile/hr\times 4 hr=260 mile[/tex]
The car traveled 260 miles in 4 hours.
Based on the chart, how are fish and dogs related?
They belong to the same kingdom but different phyla.
They belong to the same phylum but different classes.
They belong to the same kingdom and class.
They belong to the same phylum and class.
Based on the chart. fish and dogs related in that they belong to the same phylum but different classes.
What is taxonomic classification?Taxonomic classification is the science oif classifying living organisms based on similarity in structure, function of body parts and biochemical composition.
In taxonomic classification, organisms are classified into:
Kingdoms,Phylum,Class,Order,Family,Genus and Species.Based on the chart. fish and dogs related in that they belong to the same phylum but different classes.
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Answer:
fish and dogs
Explanation:
i did the test
What physical process changed the geological area and composition of the Earth's oceans shown in the two pictures below
for all my study island friends the answer is tectonic plates
The physical, geological, and compositional changes of Earth's oceans are possibly due to plate tectonics, weathering, erosion, and sedimentation. Plate tectonics form and move continents and ocean basins, leading to changes in geographical locations. Weathering and erosion, followed by sedimentation, alter land surrounding the sea and seafloor.
Explanation:The physical process that changed the geological area and composition of the Earth's oceans could include plate tectonics, weathering and erosion, and sedimentation. Plate tectonics leads to the formation and movement of continents and ocean basins. This can greatly influence the geological shape of the oceans. Weathering and erosion can change the shape and composition of the land surrounding an ocean over time. These eroded materials can be carried into the ocean through rivers and streams, altering the composition of the ocean floor. Sedimentation, the laying down of particles transported by wind, water, or ice, can also lead to changes in an ocean's geography by layering materials and forming new landforms.
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if blockages of this type occur,the most likely result would be that
Blockages in systems such as the cardiovascular system can lead to severe outcomes like heart attacks due to reduced oxygen and nutrient delivery to tissues. These blockages cause ischemia and hypoxia, leading to potential organ failure and tissue death. The body's limited ability to form alternative blood flow paths highlights the necessity of maintaining unobstructed flow.
Explanation:If blockages of this type occur, the most likely result would be a significant compromise in the function of the affected organ or system, mainly due to reduced blood flow and oxygen delivery to the tissues. These blockages, especially in arteries such as the coronary artery, can lead to severe conditions like heart attacks or myocardial infarction, where the heart muscle tissues are deprived of oxygen and nutrients, resulting in the death of cardiac muscle fibers.
In general, blockages can cause ischemia (reduced blood flow) and hypoxia (decreased supply of oxygen to tissues), which can severely affect organ function and lead to tissue death. This concept can also apply to other scenarios, such as blockages in plumbing systems causing backups, or in geology, where mud flows can block bridges and cause flooding. In each case, the obstruction impedes the normal flow, leading to potential damage or failure of the system.
The body has some capacity to form alternative paths for blood flow, known as anastomoses, but this ability is limited, especially in critical areas like the heart. Therefore, blockages that reduce the size of the opening and create turbulence can significantly slow down fluid movement, emphasizing the critical need for unobstructed flow within the cardiovascular system and beyond.
how does a combustion reaction differ from other types of chemical reactions?
A combustion reaction involves a substance reacting with oxygen to release energy, distinct from other chemical reactions by the presence of oxygen and energy production. Examples include the burning of methane or hydrogen gas, providing essential energy for society.
Explanation:A combustion reaction is a specific type of chemical reaction where a substance combines with oxygen (O₂) and releases energy in the form of light and heat. This is different from other chemical reactions because combustion specifically involves oxygen as a reactant and the production of energy. For example, the combustion of methane on a kitchen stove is represented by the equation CH₄ + 2O₂ → CO₂ + 2H₂O + Heat, where methane (CH₄) reacts with oxygen, producing carbon dioxide, water vapor, and heat. Other notable examples include the combustion of hydrogen gas, which produces water vapor: 2H₂ (g) + O₂ (g) → 2H₂O(g). Combustion reactions are essential in providing the energy that powers our societies, such as in producing electricity, transportation, and heating, but they are also a major contributor to global climate change.
The measure of gravity on Earth determines our __________.
mass
weight
2.
The closer an object is to the center of Earth, the ___________ the gravitational force on that object.
greater
less
3.
Objects in free fall are constantly picking up speed as they fall back to Earth.
true
false
The correct answer are:
#1. The measure of gravity on earth determines our weight
#2. The closer an object is to the center of earth, the greater the gravitational force on that object.
#3. Objects in a free fall are constantly picking up speed as they fall back to earth is true.
Brainliest please!
the elements found in family 1 of the periodic table are soft they they can cut with a knife. what other propert do these metals share?
Answer:
they produce extreme heat when mixed with water
...................................................................................................................
Explanation:
What happens to gas particles when a gas is compressed?
The endocrine system sends hormones through the blood to control the activities of tissues and organs.
True
False
Which statement is true concerning energy
The true statement about energy is that according to the conservation of energy, the total energy of an isolated system remains constant, even though it can change form.
Explanation:Understanding the Conservation of Energy.The statement concerning energy that is true is that the total energy is constant in any process. Energy is defined as the ability to do work and is measured in joules. According to the law of conservation of energy, energy can neither be created nor destroyed. It can change from one form to another, but the total energy of an isolated system remains constant. For example, kinetic energy, which is energy due to motion, can be converted to potential energy, or vis versa, but the sum of both will remain unchanged in an isolated system.
An essential principle to recall is that no matter how energy is transformed or transferred, the total amount of energy in the universe remains constant. This principle is known as the conservation of energy, which is a fundamental concept in physics.