Answers
Answer:
The Sarah will arrive at 5.00 P.M..
Explanation:
Distance covered by Sarah = D = 30 miles
Time taken by Sarah to travel 30 miles = T
Speed by which Sarah cycling = S = 10 mile/hr
[tex]Speed=\frac{Distance}{Time}[/tex]
[tex]Time = \frac{Distance}{Speed}[/tex]
[tex]T=\frac{30 mile}{10 mile/hr}=3 hr[/tex]
Sarah will reach her grandmother's house in 3 hours.
If she leaves the home at 2.00 P.M. ,then she will reach at her grandmother's house by 5.00 P.M..
Related Questions
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
Answers
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!
True or False: The atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen.
A.
True
B.
False
Answers
every element has its special atoms
and atoms are different from each other
The statement that atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen is False.
This is because, all atom of different element are unique, and elements are all the different types of atoms.
What is an atom?An atom can be regarded as the smallest unit of ordinary matter which is required in making chemical element.
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the gram formula mass of a compound is 48 grams. the mass of 1.0 mole of this compound is
Answers
Which statement is true concerning energy
Answers
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.
How did Mendeleev arrange the known elements in his periodic table?
Answers
Mendeleev was the first scientist to classify elements into what called the periodic table. However, unlike the modern periodic table that we use today, Mendeleev classified elements based on the mass number and not by atomic number.
What is periodic table ?Periodic table classify all known elements into different groups and periods. The vertical columns in the table are called groups and the horizontal rows are called periods. All the elements are classified based on their atomic number in the modern periodic table.
At the time of Mendeleev there were only 65 to 70 known elements. He classified these elements based on their mass number. The periodicity of these elements and their classification into groups all were based on their mass number.
However, later Mosely found that, the properties of an atom is purely based on their atomic number and not by mass numbers. He forwarded the modern periodic table based on the atomic number of elements.
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Why is the deuterium-tritium reaction the most promising nuclear fusion reaction for future energy production?
Answers
Answer:
The most promising of the nuclear fusions reactions for the future is the deuterium-tritium fusion, it comprises the deuterium cycle in which an amalgamation of tritium and deuterium takes place. The reaction produces an enormous energy of 17.6 MeV, however, to attain fusion there is a need to infiltrate the coulomb barrier with the help of tunneling, needing very high temperatures.
Which of the following rate constants corresponds to the reaction that converts reactants to products in the least amount of time? A. 4.48 x 10-5 min-1 B. 4.48 x 10-5 s-1 C. 0.0547 s-1 D. 0.0547 min-1
Answers
Explanation:
The rate constant is a numerical value that relates the rate of reaction with the concentrations of the reactants.
The rate constant is the constant of proportionality between the rate of the reaction and the concentrations of the reactants.
The greater the rate constant the greater the rate of reaction.
The units of the rate constant depend of the degree of the reaction.
For a first degree reaction the units may be s^-1 or min^-1, among others.
Compare A with B: 4.48 * 10 - 5 min^-1 is slower than 4.48 * 10 ^ -5 s^ -1 (it is faster to change a given amount in a second than in a minute).
For the same reason 0.0547 s^ -1 is faster than 0.0547 mni ^ -1.
Now compare 4.48 * 10^ - 5 s^ -1 with 0.0547 s ^ -1. The number 0.0547 is greater than 4.48 * 10^ - 5, so it is faster 0.0547 s^ - 1 than 4.48 * 10^ -5 s^ -1.
And that. 0.0547 s^ -1, is the fastest of all, i.e. the one that converts reactants to products in the least amount of fime.
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products? kinetic energy closed systems law of conservation electromagnetic energy
Answers
Answer : The correct option is, Kinetic energy.
Explanation :
According to the kinetic energy, the kinetic energy is directly proportional to the mass of an object and the square of the velocity of an object.
The formula of kinetic energy is,
[tex]K.E=\frac{1}{2}\times m\times v^2[/tex]
where,
K.E = kinetic energy
m = mass of an object
v = velocity of an object
From this we conclude that there is a direct relationship between the kinetic energy and the mass of an object.
As per question, the reactant have a mass of 10 grams and contains energy 1000 J and the product have a mass of 5 grams and contains energy 500 J that means as the mass of an object decreases, the kinetic energy is also decreases.
Hence, the correct option is, Kinetic energy.
Answer:
C. law of conservation of energy
This is the correct answer on edge.
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
Answers
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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Nitrogen can ionically bond with an unknown element X from group 2. How many ions of element X are required to create a stable ionic compound with nitrogen? A) 2 B) 3 C) 4 D) There is not enough information.
Answers
Answer is: B) 3.
Nitrogen (nonmetal) in this compound has oxidation number -3 and element X (metal) has oxidation number +2.
Smallest common multiple for 3 and 2 is 6.
number of nitrogen atoms = 6 ÷ 3.
number of nitrogen atoms = 2, there are two nitrogen atoms.
number of atom X: 6 ÷ 2 = 3.
For example, Mg₃N₂ is magnesium nitride. Nitrogen has -3 oxidation number and magnesium has oxidation number +2.
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.
Answers
2) dark spots that appear sometimes because of concentrations of magnetic field flux
3) "a brief eruption of intense high-energy radiation from the sun's surface"
4) gas extended out from the corona but is attached to the sun and can reach great distances
5) large area in cocrona which is less dense and has cooler temperature they occur when "the Sun's magnetic field is open to interplanetary space"
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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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
Answers
A. C + O2 → CO2 + heat
The heat on the right side means that the reaction release (yields) heat. This is an exothermic reaction. Relasing heat means that the surrondings will receive an extra amount of heat as consequence of the reaction, so this reaction is not suitable to the target of cooling hot water.
This is a wrong choice.
B. CaCl2 → Ca2+ + 2Cl- + heat
This is the same situation explained above. An exothermic reaction which will increase the temperature of the water instead of cooling it.
Wrong choice.
C. NH4Cl + heat → NH4+ + Cl-
This is the right choice.
The heat shown in the side of the reactants means that the reaction uses (absorbs) heat. Where from will the reaction absorb this heat? From the surroundings which include the hot water. In conclusion, the reaction will use heat from the hot water consequently cooling it.
D. N2 + 3H2 → 2NH3 + heat
The very same case of the first two options. Wrong choice, because it iis an exothermic reaction which will increase the temperature of the surroundings.
Answer:
Explanation:
Just look at the photo it will tell you the answer it’s the explanation from study Island
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?
Answers
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.
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
Answers
Molar mass H2O = 18.02 g/mol
ΔH vap = 40.7 kj/mol
energy = ( mass ) / ( molar mas H2O ) * ΔH vap
energy = ( 27.9 / 18.02 ) * 40.7
energy = 1.54827 * 40.7
energy = 63.09 Kj
Answer C
hope this helps!
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?
Answers
Now we have to convert % to atoms ( or mole) To do this we divide by the relative atomic mass.
C = 60/12 = 5
H = 13.4/1 = 13.4
O = 26.6/16 = 1.66
This is your empirical formula. However it doesn't really make sense having decimal points.
So divide by 1.66
C = 5/1.66 = 3.01
H = 13.4/ 1.66 = 8.07
O = 1.66/1.66 = 1
This makes more sense. C3H8O, the empirical formula.
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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Which of the following best describes an advantage of cloning? Can prevent genetic diseases Can increase genetic diversity Helps increase lifespan of cloned organisms Helps reduce health issues in cloned organisms
Answers
Answer:
prevents genetic diseases
Explanation:
yes
An advantage of cloning is that it can potentially prevent genetic diseases in organisms. Cloning allows for the replication of an organism's genetic material without introducing new genetic variation, which means that if the original organism is free from certain genetic diseases, its clones would also be free from those diseases. This can be particularly valuable in agricultural and medical contexts.
For example, in agriculture, cloning can be used to replicate plants or animals that have desirable traits and are disease-free. This ensures a consistent supply of healthy, high-yield crops or livestock, reducing the risk of crop failure or disease outbreaks.
In the medical field, cloning can be used for therapeutic purposes to create tissues or organs for transplantation. By cloning cells from a patient's own body, the risk of immune rejection is minimized, reducing the chances of complications and improving the patient's overall health.
However, it's essential to note that while cloning has its advantages, ethical and moral considerations, as well as potential unintended consequences, must be carefully addressed when implementing cloning technologies.
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How is compound different from a mixture?
A. it is made of one substance
B. it cannot be made of organic materials
C. it cannot be broken down
D. it cannot be separated by a physical change
Answers
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?
Answers
The limiting reactant = hydrogen
The theoretical yield = 1404 grams
Explanation:
1- getting the limiting reagent:
The reaction between hydrogen and oxygen to form water can be expressed using the following equation:
2 H₂ + O₂ ...........> 2 H₂O
From the balanced equation, we can note that:
2 moles of hydrogen are required to react with 1 mole of oxygen. This means that the ratio is 2:1 which means that for a certain number of oxygen moles, twice that number of hydrogen moles is required.
This means that:
For 78 moles of oxygen , 78*2 = 156 moles of hydrogen are required.
Since only 78 moles of hydrogen are present, therefore, hydrogen is our limiting reagent.
This means that the reaction would stop once the amount of hydrogen is consumed. This also means that we would base all our further calculations on the amount of hydrogen present.
2- getting the theoretical yield:
Again, the balanced equation is:
2 H₂ + O₂ ...........> 2 H₂O
From this equation, we can note that:
2 moles of hydrogen produce 2 moles of water.
This means that 78 moles of hydrogen would also produce 78 moles of water.
The theoretical yield will be equivalent to the mass of 78 moles of water.
mass of water = number of moles * molar mass
mass of water = 78 * 18
mass of water = 1404 grams
Hope this helps :)
Answer:
Actual yield
Explanation:
just did it on edg.
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.
Answers
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
How much salt is in 300 g of a 3.5 % solution of salt water?
Answers
describe the difference in structure between beH2 and CaH2
Answers
BeH₂ is a linear molecule, while CaH₂ is an angular molecule.
The difference between these two molecules is given by the number of electrons they have. Be is in the 2nd period of the Periodic table, and the ion Be⁺² doesn't have any free electron pairs when bonding to H. Ca is in the 4 period of the periodic table, meaning that it has more electrons, and the ion Ca⁺² has two free electron pairs when bonding to H that makes the molecule angular by pushing the bonds at an angle by sterical hindrance.
Have a nice day!
if blockages of this type occur,the most likely result would be that
Answers
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.
Which of the following best describes the conditions created by El Niño? When is that normally blowup to east get stronger waters off the coast of north America cool down and upwelling increases in proving the nutrients in the water. Wednesday normally blood to the west get stronger waters off the coast of South America cool down and upwelling increases improving the nutrients in water. When is the normally blowup to the west slacken waters off the coast of South America walk up and upwelling decreases reducing the nutrients in the water
Answers
What happens to gas particles when a gas is compressed?
Answers
Which property of an object changes when an unbalanced force acts on it?
A. Mass
B. Inertia
C. Velocity
D. Temperature
Answers
Answer:
velocity is the answer i just did this quiz
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?
Answers
they have a react vigorously with water
reactivity increases down the group
Answer:
they produce extreme heat when mixed with water
...................................................................................................................
Explanation:
Which of the following is a scalar? (1)centripetal force (2)weight (3)speed (4)acceleation
Answers
Acceleration could be if it is defined in terms of speed, but the direction is always inferred. So acceleration is a vector whether or not the direction is given or not. It is never a scalar. This is the hardest one to classify, but don't be fooled. The other two are vectors. Weight is a force going in the direction of gravitational attraction and Centripetal force points towards the center.
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.
What physical process changed the geological area and composition of the Earth's oceans shown in the two pictures below
Answers
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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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.
Answers
PE = 25 × 10 × 4 (am taking gravity to be 10 m/s^2....it could also be 9.81)
PE = 1000 J
Kinetic energy = (1÷2) mass × speed^2
EK = 0.5 × 25 ×5^2
EK= 312.5 J
energy LOSS DUE TO FRICTION IS 1000 - 312.5 = 687.5J (If I made no error in calculations)
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
Answers
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.