In the design of a thermos lab, the container that is used for comparison purposes with the thermos is typically an uninsulated container or a regular open container. This is done to demonstrate the effectiveness of the insulation in the thermos and highlight its ability to retain heat or cold compared to a container without insulation.
Purpose of uninsulated container
By checking the temperature of the thermos and the uninsulated container, you can see how heat moves differently between them. The thermos keeps drinks hot or cold for a long time because it doesn't let heat get in or out easily. But a regular container lets heat in and out more easily.
This comparison shows how well the thermos can keep drinks hot or cold for a long time. It says it's important to use insulation to stop heat from escaping, and it shows how using a thermos can keep things at the right temperature for longer.
The disturbance that occurs as longitudional waves travel through a medium can be described as a series of
oscillations and refractions.
destructions and constructions.
propagations and compressions.
rarefactions and compressions.
Answer:
The disturbance that occurs as longitudinal waves travel through a medium can be described as rarefactions and compressions.
Explanation:
As longitudinal waves travel, particles in the medium are pushed together and then pulled apart. We call this rarefactions and compressions.
During fuel burn, the vertically launched Terrier-Sandhawk rocket had an acceleration of 300 m/s2 (about 30 times free-fall acceleration called 30 g). The fuel burned for 7.0 s . Find the height of the Terrier-Sandhawk rocket at the end of fuel burn.
The equation that we can use in this case is:
y = v0 t + 0.5 a t^2
where, y is the height, v0 is initial velocity = 0, t is time, a is acceleration so that:
y = 0 + 0.5 * (300 m/s^2) * (7 s)^2
y = 7350 m
You and a friend stand on a snow-covered roof. you both throw snowballs from an elevation of 15 m with the same initial speed of 13 m/s, but in different directions. you throw your snowball downward, at 40° below the horizontal; your friend throws her snowball upward, at 40° above the horizontal. what is the speed of each ball when it is 5.0 m above the ground? (neglect air resistance.)
The speed of the snowball thrown downward when it is 5.0 m above the ground is 11.82 m/s, and the speed of the snowball thrown upward when it is 5.0 m above the ground is 13.44 m/s.
Explanation:To find the speed of each snowball when it is 5.0 m above the ground, we can use the equations of motion for projectiles. For the snowball thrown downward, we can use the equation:
vf = sqrt(vi^2 + 2gh)
where vf is the final velocity, vi is the initial velocity, g is the acceleration due to gravity, and h is the vertical distance. For the snowball thrown upward, we can use the same equation with a negative value for h. Substituting the given values:
For the snowball thrown downward: vf = sqrt((13 m/s)^2 + 2*(-9.8 m/s^2)×(15 m - 5 m)) = 11.82 m/s
For the snowball thrown upward: vf = sqrt((13 m/s)^2 + 2×(-9.8 m/s^2)×(-15 m + 5 m)) = 13.44 m/s
You are discussing a material that has a strong resistance to the flow of electrons. This is a description of a(n)
conductor.
semi–insulator.
insulator.
semi–conductor.
Can someone check if what i wrote so far makes sense and if i made a mistake.
Given the distance between the crest of one wave and the crest of the next wave, you can determine the wavelength. amplitude. frequency. equilibrium.
Answer:
Wavelength
Explanation:
The distance between the crest of one wave and the crest of the next wave is called wavelength of a wave. It is denoted by lambda λ. The maximum displacement of the particle of a wave is called amplitude of wave. The topmost value of displacement of the wave is called crest of a wave while the lowermost value of displacement of the wave is called trough of the wave.
Hence, by finding the distance between the crest of one wave and the crest of the next wave, we can determine the wavelength of a wave.
true or false kinetic energy is energy that moves matter
A car increases its speed from 9.6 meters per second to 11.2 meters per second in 4.0 seconds. the average acceleration of the car during this 4.0-second interval is answer
Avg Acceleration is
[tex]\rm 0.4\;m/sec^2[/tex]
Step by Step Solution :
Given :
Final Speed, v = 11.2 m/sec
Initial Speed, u = 9.6 m/sec
Time, t = 4 sec
Calculation :
We know that,
[tex]\rm Avg\;Acceleration = \dfrac{v - u }{t}[/tex]
[tex]\rm Avg \; Acceleration = \dfrac{11.2-9.6}{4}[/tex]
[tex]\rm Avg\;Acceleration =\dfrac{1.6}{4}=0.4 \;m/sec^2[/tex]
Therefore avg acceleration is
[tex]\rm 0.4\;m/sec^2[/tex]
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Karen massed an object 3 times using the same equal arm balance and gram massed. Her results were 18.324 g 18.308 g and 18.342 g. How could she best report the mass of the object
What decimal power does the abbreviation p represent?
What happens to the force between two charges if the distance between them is tripled?
According to a college survey, 22% of all students work full time. find the mean for the number of 3) students who work full time in samples of size 16.
Assuming that the students
worldwide are being considered, because of the extremely large population, this
can be considered as a binomial distribution. A normal distribution is used most
usually as a fair approximation of the binomial. The mean is the expectation,
therefore:
E[x] = np = (16)(0.22) = 3.52
μ = 3.52
To find the mean for the number of students who work full time in samples of size 16, multiply the sample size by the percentage of students who work full time.
Explanation:To find the mean for the number of students who work full time in samples of size 16, we can simply multiply the sample size (16) by the percentage of students who work full time (22%):
Mean = 16 * 0.22 = 3.52
Therefore, the mean number of students who work full time in samples of size 16 is 3.52.
The atomic mass of an element is
A.The average mass of all the isotopes of the element
B. A measure of the density of that element
C.The mass of the most common isotope of that element
D.The number of protons and electrons in the atoms of the element
The density of uranium is 18.8 g/cm3 . part a what is this value in kilograms per cubic meter?
Final answer:
To convert the density of uranium from g/cm³ to kg/m³, multiply the density by the factors to convert grams to kilograms and then cubic centimeters to cubic meters, resulting in a density of 18,800 kg/m³.
Explanation:
To convert the density of uranium from grams per cubic centimeter (g/cm³) to kilograms per cubic meter (kg/m³), we will use the conversion factors of 1 kg being equal to 1000 grams and 1 m³ being equal to 1,000,000 cm³. The density of uranium given is 18.8 g/cm³.
Step 1: Convert grams to kilograms.
1 g = 0.001 kgMultiply the density value by the conversion factor to change grams to kilograms:
Density in kg/cm³ = 18.8 g/cm³ * 0.001 kg/g.
So, Density in kg/cm³ = 0.0188 kg/cm³.
Step 2: Convert cubic centimeters to cubic meters.
1 cm³ = 1/1,000,000 m³Now, multiply the density in kg/cm³ by the conversion factor to change cubic centimeters to cubic meters:
Density in kg/m³ = 0.0188 kg/cm³ * 1,000,000 cm³/m³.
So, Density in kg/m³ = 18,800 kg/m³.
What are three problems that can result from poor soil management? Erosion Nutrient depletion Development Desertification
Erosion, Nutrient Depletion and Desertification are the three problems that can result from poor soil management.
Poor soil management is damages environment and is a threat to our food supply. It results in erosion, nutrient depletion, desertification which makes the soil less fertile and unproductive and thus affects our food supply.
What is the density of a 36 g object with a volume of 15 cm3? (Density: D = ) 0.42 g/cm3 0.54 g/cm3 2.4 g/cm3 5.4 g/cm3
The density of a [tex]36 g[/tex] object with a volume of [tex]15 cm^{3}[/tex] is [tex]2.4 g/cm^{3}[/tex].
What is the density?Density of substance is defined as its mass per unit volume. Density gives information about how tightly the substance is packed together. The formula for density is
[tex]\rho = \frac{m}{V}[/tex]
Where,
[tex]\rho =[/tex]density
[tex]m =[/tex]mass
[tex]V =[/tex]volume
Unit of density is grams per cubic centimetre.
What are uses of density?One of the most common uses of density is in how different materials interact when mixed together.
Wood floats on water because it has a lower density than water, while an anchor sinks as the metal has high density.Balloons filled with helium gas float because the density of the helium is low than the density of air.Given
[tex]m = 36 g[/tex]
[tex]V = 15 cm^3[/tex]
The density of substance is
[tex]\rho = \frac{m}{V}\\\rho = \frac{36}{15}\\\rho = 2.4 g/cm^3[/tex]
Hence, The density of a substance is [tex]2.4 g/cm^3[/tex].
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What occurrence defines the end of the protostar phase of a star's life and the start of the main-sequence phase?
How much does a gold bar weigh and how much is it worth?
The weight of a standard gold bar is approximately 12.4 kilograms with a market value of around $744,000, based on a gold price of $60,000 per kilogram. The density of gold is critical for determining its authenticity, distinct from similar materials like tungsten.
The weight of a gold bar and its worth can vary significantly depending on the size of the bar and the current market value of gold. Generally, gold bars can come in different sizes, but a standard bar, also known as a gold ingot, is approximately 400 troy ounces or about 12.4 kilograms. Based on the density of gold, which is 19.30 g/cm3, a standard gold bar would have a volume of approximately 643.15 cm3 (since 12400 g / 19.3 g/cm3).
If we consider the approximate market value of gold, which is about $60,000 per kilogram, a standard 400 troy ounce gold bar would be worth around $744,000. However, the price of gold fluctuates constantly due to market conditions. It's also worth mentioning that the density of gold is a critical factor in determining its authenticity; fraudsters have been known to sell gold-plated tungsten ingots as pure gold because of tungsten's similar density to gold.
The energy transfer diagram represents the energy of a light bulb.
How much electrical energy is involved in this transformation?
60 J
80 J
100 J
120 J
Answer: 120 J
Explanation:
The law of conservation of energy states that energy cannot be created nor destroyed, but only converted into other forms.
In this problem, we have an initial amount of electrical energy, E, converted into two forms of energy: light energy (L) and heat (H). For the law of conservation of energy, we have:
[tex]E=L+H[/tex]
So, we can find the initial amount of electrical energy:
[tex]E=20 J+100 J=120 J[/tex]
The energy of a photon of light emitted by an electron equals the
To solve this we must be knowing each and every concept related to photon. Therefore, the energy of a photon of light emitted by an electron is equal to Energy difference between two levels.
What is photon?A photon is indeed an elementary particles which is a quantum of a electromagnetic field, comprising electromagnetic radiations like as light but also radio waves, and the electromagnetic force's force carrier.
Electrons are negative charges subatomic particles that spin in their separate sub orbitals outside the nucleus. Every electron is characterized by it's own energy level and is electrostatically attracted to the nucleus.
Therefore, the energy of a photon of light emitted by an electron is equal to Energy difference between two levels.
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Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground. According to Newton’s universal law of gravitation, which would change the path of the ball so it traces out the widest curved path possible?
Answer:
tossing it horizontally at a faster speed
Explanation:
The property that objects have to fall when released from a certain height from the ground was well known since ancient times. For much of our history, the free-falling motion of objects was considered natural, ignoring the need for any causative agent. It was not until the seventeenth century that the English scientist Isaac Newton formulated a theory capable of explaining the cause of these movements and describing them precisely: the law of universal gravitation.
Under this law, free fall is a uniformly accelerated motion and causes any object influenced by the acceleration of gravity to move. This explains why the ball, dropped by Cecelia, fell in a straight path to the ground. According to this law, if Cecelia wanted the ball to travel the widest possible path during the fall, she should play the ball horizontally at a faster speed.
Which type of friction prevents a pile of rocks from falling apart?
Rolling friction
Kinetic friction
Cohesive friction
Static friction
a net force of magnitude 36N gives an object of mass m1 an acceleration of 6.0m/s2. The same net force gives m1 and another object of mass m2 fastened together an acceleration of 2.0m/s2. What acceleration will m2 experience if the same net force acts on it alone?
How to calculate the gain in Kinetic Energy?
If there was an sudden change in exchange rates that resulted in fewer U.S. Dollars being required to buy a Euro, you could expect
Answer:
The correct answer is "the dollar to appreciate when compared to the Euro".
Explanation:
If fewer US dollars are required to buy one euro, this means that the value of the euro concerning this currency would fall. Therefore the dollar appreciates against the euro. This way you can buy more euros with the same amount of dollars you had before.
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What is the potential engery of a 150 kg diver standing on a diving board that is 10m high?
Answer:
anime
Explanation:
anime=LIFE
What does the slope of a line on a graph of motion refer to?
Which of the following would most likely happen if water did not form hydrogen bonds?
A. Water would exist only as a solid
B. Water would be able to dissolve all ionic compounds
C. Water would not expand when it freezes
D. Water would not exist on earth
Hydrogen bonds in water lead to the expansion of ice, allowing it to float and serve as insulation in bodies of water.
Hydrogen bonds are crucial in water's unique properties: When water freezes, it expands due to hydrogen bonding, creating a less dense solid form compared to its liquid state. This expansion allows ice to float on water, insulating the liquid below and allowing life to exist.
Which question about dogs could be answered through scientific investigation?
How loving a pet is an Irish terrier?
How fast does an Australian terrier grow?
Which type of dog gets along the best with cats?
Which breed of dog is the cutest to children?
The question 'How fast does an Australian terrier grow?' could be answered through scientific investigation. This requires data collection and analysis about dog growth rates. Other questions are subjective and lack the objective criteria necessary for scientific studies.
Explanation:Out of the questions listed, the one that could be answered through scientific investigation is: 'How fast does an Australian terrier grow?' This question involves research and data collection on the growth rates of dogs, specifically Australian terriers. Scientists and veterinarians could conduct studies, measuring the size of these dogs at regular intervals and calculating average growth rates. Information can be analyzed statistically to derive at an answer.
Questions pertaining to dogs' affection, compatibility with cats, or attractiveness to children might not fulfil the objective criteria needed for a scientific investigation. These largely depend on subjective assessments and personal experiences, which could vary greatly among individuals.
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f your muscles are not getting enough oxygen during exercise, they will stop moving.
True
False
Answer:
FALSE
Explanation:
The lesson says-
"At first, the body can't change quickly enough to give the muscles the amount of oxygen they need. This situation produces an oxygen deficit in the muscles. During this oxygen deficit, the muscles don't have the necessary amount of oxygen they need in order to produce enough energy to keep moving. Instead of the muscles just stopping, however, the body has a second system that kicks in during emergencies."