Suppose the diver at the top of a 9 m high platform has a mass of 50.0 kg. Calculate her potential energy relative to the ground. Answer in Joules.
For the purpose we will use the following equation for potential energy:
U = m * g * h
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth).
When we plug values into the equation, we get following:
U= 50kg * 9.8 N/kg *9m = 4410 J
The lowest stratum of the atmosphere is the ______________.
stratosphere
troposphere
mesosphere
2.
Most of the earth's ozone is located in the _______________.
stratosphere
troposphere
mesosphere
3.
Earth's coldest temperatures occur in the _______________.
stratosphere
mesosphere
troposphere
how do you know that a sealed calorimeter is a closed system?
a) because temperature is conserved
b) because the masses of the sample and water are equal
c) because thermal energy is not transferred to the environment
d) because work is done on the test sample
Answer: Option (c) is the correct answer.
Explanation:
When a system is open then there will be exchange of energy between the system and surrounding.
Whereas when a system is closed then there will be no exchange of energy, that is, thermal energy will not flow into the atmosphere.
Thus, we can conclude that a sealed calorimeter is a closed system because thermal energy is not transferred to the environment.
Final answer:
A sealed calorimeter is a closed system because it does not allow thermal energy to transfer to the environment, allowing for conservation of energy within the system. The correct option is c.
Explanation:
A sealed calorimeter is considered a closed system primarily because thermal energy is not transferred to the environment. By being sealed, it allows energy in the form of heat to be exchanged within the system (the chemical reaction and the water in which the reaction occurs), but it does not allow matter or heat to escape or enter from the external environment. The principle that supports the calorimeter's status as a closed system is the conservation of energy, meaning no overall energy change occurs during the chemical reaction when considering both the system and its surroundings.
Differentiating between types of systems, an open system can exchange both energy and matter with its surroundings, such as a pot of boiling water. A closed system, like a sealed calorimeter, can exchange energy but not matter. An isolated system exchanges neither energy nor matter, but such systems are theoretical as all real systems will eventually exchange some energy with their surroundings.
The sealed calorimeter fits the definition of a closed system because it allows for the exchange of energy within the system while maintaining its mass constant, indicating that no mass is exchanged with the external environment.
When heating the copper in the final step, the bright copper color changes to a dull brown. Will the percent recovery be too high, too low, or unaffected ?
Why does ammonia, NH3, behave as a base when it reacts with an acid?
Which environmental changes occur Fastest
The environmental change that occur fastest is the volcanic eruption.
What is a volcanic eruption?It should be noted that the volcanic eruption simply means when lava when gas are released from volcano.
The environmental change that occur fastest is the volcanic eruption and it should be noted that the most dangerous one is known as the glowing avalanche.
Learn more about volcano on:
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Final answer:
The fastest environmental changes today include climate change, loss of biodiversity, and alterations to the water cycle, all of which are significantly accelerated by human activities, particularly since the mid-20th century.
Explanation:
Notably, the fastest environmental changes currently occurring relate to climate change, loss of biodiversity, and changes in water cycles. These changes are largely driven by human activities, notably since the mid-20th century, a period often referred to as the Great Acceleration, indicating a steep increase in population growth, GDP, and resource consumption leading to a profound ecological impact. Climate change is one of the most dramatic examples of rapid environmental alteration. It is occurring at a pace unprecedented in human history, with global temperatures projected to rise significantly within a single century, a rate at least 100 times faster than naturally occurring changes. This swift change is too rapid for many social systems, natural species, and ecosystems to adapt, leading to increased risks of extinction, spread of diseases, and more frequent catastrophic natural disasters.
Another swift change is seen in the loss of biodiversity, where species are going extinct at a rate much higher than the natural background rate, primarily due to habitat destruction, pollution, overexploitation, and climate change. Additionally, water cycles are being altered, with some regions experiencing more intense droughts and others more severe flooding, challenging existing agricultural practices and water management systems.
Which criteria determine whether a heterogeneous mixture is a colloid or a suspension?
number of molecules of water in 6 moles
What is the main factor that prevents the growth of tropical plants in the northern part of the United States?
A) Predators
B) Overpopulation
C) Pollutants
D) Climate
In the chemical reaction: Br2(g) + Cl2(g) ↔ 2 BrCl(g) KP = 0.150 If there is initially 0.500 atm of BrCl and nothing else in a container, what direction does the reaction move: a) Q > K and the reaction moves to the right b) Q > K and the reaction moves to the left c) Q < K and the reaction moves to the left d) Q < K and the reaction moves to the right
We know that
Kp = Product of partial pressures of products / product of partial pressures of reactants
For given reaction
Br2(g) + Cl2(g) ↔ 2 BrCl(g)
Q = p^2BrCl / pBr2 X pCl2 [Q= reaction quotient]
now as given that there is only BrCl in the container so the pressure of BrCl will be only pressure to be accounted
Hence
Q= (0.5)^2 = 0.25
Now as Q > Kc The reaction will move in backward direction or left side or reactant side s
so answer is
Q > K and the reaction moves to the left
The reaction will B) move to the left since Q > K.
FURTHER EXPLANATIONThe equilibrium constant, K, describes the reaction at equilibrium. It provides insight on whether the formation of the reactants or products are favored at equilibrium.
The value of the equilibrium constant is determined from the following expression:
[tex]K \ = \frac{[products]}{[reactants]}[/tex]
It is simply the ratio of the concentration of the products and the concentration of reactants at equilibrium.
If the value of the equilibrium constant, K, is greater than 1, then, at equilibrium, the formation of products is favored. If K is less than 1, then the formation of reactants will be favored.
For systems, however, that are not yet at equilibrium, the direction of the reaction that will lead to equilibrium can be determined using another constant called the reaction quotient, Q. It is obtained using the similar expression as K but instead of using the equilibrium concentrations of the reactants and products, their initial concentrations are used.
The value of Q indicates whether the formation of products or reactants are favored so that equilibrium is achieved. If Q is greater than K, then the formation of reactants (or the reverse reaction) is favored. If Q is less than K, then the formation of products (forward reaction) is favored.
In this problem, the reversible equation provided is:
Br₂(g) + Cl₂(g) ⇄ 2 BrCl(g) K= 0.150
To obtain the Q value, the initial concentration (in this case the partial pressure) of the substances are plugged into the equilibrium expression. Since there are no Br₂(g) and Cl₂(g) initially, only the partial pressure of BrCl will be used in the equation:
[tex]Q = \frac{[BrCl]^2}{[Br_{2}][Cl_{2}]} \ or \ Q = \frac{P_{BrCl}^2}{P_{Br_{2}}P_{Cl_{2}}}\\\\Q = P_{BrCl}^2\\Q = (0.500 \ atm)^2\\\boxed {Q = 0.250}[/tex]
Comparing the Q vs. K,
Q = 0.250 and K = 0.150, hence,
[tex]0.25 > 0.150\\\\\boxed {\boxed {Q > K, the \ reverse \ reaction \ will \ be \ favored; \ the \ reaction \ moves \ to \ the \ left}}[/tex]
LEARN MOREEquilibrium brainly.com/question/538664Le Chatelier's Principle https://brainly.com/question/12983923Keywords: Equilibrium Constant, Reaction Quotient
What characteristic of rivers at their source gives them so much power to shape the land
The power of rivers at their source to shape the land comes from the narrowness of their channels, which results in faster currents and strong hydraulic action.
The characteristic of rivers at their source that gives them so much power to shape the land is primarily due to the narrowness of the channel, resulting in a faster current compared to other parts of the river or stream. This faster current is capable of exerting a strong force, or hydraulic action, on the land, which can lead to significant erosion and geomorphological changes. Hydraulic action occurs when the moving water strikes against the bed and banks of the river channel, compressing water and air into cracks and crevices, exerting enormous pressures, and causing material to break away.
Rivers and streams, from their source to their mouth, continually erode the geosphere, transport sediments, and eventually deposit them, significantly altering the landscapes through which they flow. At the source, rivers are typically colder, clearer, and carry less nutrients, featuring swift currents that can inhibit silt accumulation and support unique ecosystems adapted to these conditions.
A county creates an park to protect a forest.
What affect does attendance have on students' grades in science class? Write the independent variable, the dependent variable, and the hypothesis.
In a study exploring the effects of attendance on student grades in science class, attendance would be the independent variable as it's the factor being manipulated, and the student grades would be the dependent variable as they are potentially affected by attendance. A possible hypothesis could be: 'Regular attendance in science class leads to higher grades for students.'
Explanation:In a scientific study targeting the influence of attendance on student grades in science class, the independent variable (IV) would be the attendance, representing the factor that can be manipulated or that changes naturally. The dependent variable (DV) on the other hand, would be the student grades, as these are potentially influenced or changed by the attendance rate.
A possible hypothesis could be: 'Regular attendance in science class leads to higher grades for students.' This hypothesis suggests that if a student frequently attends their science class (IV), then their grades (DV) might improve.
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According to the picture trout are a major source of food for bears. What would happen to the bear population if the trout population became significantly larger? A) The bear population would grow. B) The bear population would decrease. C) The bear population would stay the same. D) The change in the bear population can not be predicted.
Answer:
The an swer is A) on usa testprep
Explanation:
The bear population would grow. If there are more trout, there will be more food for the bears.
PLEASE HELP
Titration #1
A total of 25.0 mL of 0.150 M potassium hydroxide (KOH) was required to neutralize 15.0 mL of sulfuric acid (H2SO4) of unknown concentration. What is the concentration of the sulfuric acid?
Balanced Equation:
Acid(unknown) - Solution, Molar Ratio, Volume, Concentration
Base(known) - Solution, Molar Ratio, Volume, Concentration
2KOH + H2SO4 = K2SO4 + 2H20
From the reaction, it can be seen that KOH and H2SO4 have the following amount of substance relationship:
n(KOH):n(H2SO4)=2:1
From the relationship we can determinate required moles of H2SO4:
n(KOH)=c*V=0.15M*0.025L= 0.00375 mole
So,
n(H2SO4)=n(KOH)/2= 0.00375/2= 0.00188 moles
Now, when moles of H2SO4 is known, concentration can be calculated:
c(H2SO4)=n/V= 0.00188mole/0.015L= 0.125M
N2 (g) + 3H2 (g) -->2 NH3 (g)
The equation above is the equation for the Haber process.
In a certain reaction, you start with 3.0 moles of nitrogen and 4.0 moles of hydrogen,. How many moles of ammonia will be produced in the reaction?
Calculate the number of molecules in 0.75 moles of CH₄. x 10²³ molecules
Ans :4.5 * 10²³ molecules
Given:
Moles of CH4 = 0.75
To determine;
The number of molecules of CH4 in 0.75 moles
Explanation:
1 mole of CH4 contains Avogadro's number i.e. 6.023*10²³ molecules
Therefore, 0.75 moles would correspond to :
= 0.75 moles * 6.023*10²³ molecules/1 mole
= 4.5 * 10²³ molecules
Answer:
4.5
Explanation:
Will Give Brainliest if your correct. ______ are traces of preexisting life, which may exist in the form of shells, bones, or impressions of plant leaves and soft body parts.
A.Rock records
B.Fossils
C.Fauna
D.Flora
Rock records are not an evidence of pre-existing lives.
The flora and fauna constitute the living species of all the plant and animals including the humans. The animal and plant that might have existed long ago can never physically leave evidence in the form of fresh leaves and flesh.
The fossil of the animals and humans and other life forms gives us a clear evidence of what kind of life existed in the years preceding us.
Hence, the correct answer is option B that is fossils.
I need help with # 7
Amy performed an experiment in lab. She improperly mixed the chemicals, and an explosion of light, sound, and heat occurred. When Amy mixed the chemicals, energy was _______. A. stabilized B. created C. destroyed D. transformed
The answer is D transformed
Answer:
ay nose
Explanation:
Hellllllpppppp this is soooo hard
what fossil fuel accounts for 95% if consumption for transportation
Answer:
nuclear energy i think
Explanation:
A scientist took a sample of enzymes from cow saliva and mixed them with a form of starch found in grains. After a while the starch broke into many smaller molecules. This shows that
Question 2 options:
cows should not be fed grains.
cows do not use the food that they eat.
cows break down the food that they eat.
grains are made of enzymes.
Answer:
The answer is cows break down the food that they eat
Explanation:
Organisms, such as cows, that eat plants or animals break down the food they have eaten using acids and digestive enzymes. The broken down food is used by their bodies to produce building materials and the energy that they need to survive.
idk how to do this sos
Where in the water column would you expect to find the following conditions the highest pressure readings the densest waters the warmest temperature
Answer: The highest pressure is at the bottom
Explanation:
I got it right
if you exhale 7.25×10 to the 24th power molecules of CO2. How many moles of CO3 do you exhale?
what property of an object is related to the average kinetic energy of the particles in that object?
a) specific heat
b) mass
c) conductivity
d) temperature
Answer: Temperature
Explanation: Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:
[tex]K.E=\frac{3RT}{2}[/tex]
K.E= Average kinetic energy
R= gas constant
T= temperature
From the equation above, it can be seen that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more and vice-versa.
Thus average kinetic energy of the particles in an object is related to temperature.
Will give brainliest .Antarctica is believed to have always been positioned at it's current spot on the Earth.
True Or False.
If 10.0 liters of H2(g) at stp is heated to a temperature of 546 K what is the new volume
The new volume of 10.0 liters of H2(g) heated to 546 K is 20.0 liters, calculated using Charles's Law.
Explanation:To calculate the new volume when 10.0 liters of H2(g) at standard temperature and pressure (STP) is heated to a temperature of 546 K, we can use the ideal gas law in the form of Charles's Law, which states that the volume of a gas is directly proportional to its temperature, assuming pressure and the amount of gas remain constant.
The formula for Charles's Law is:
V1/T1 = V2/T2
Where V1 is the initial volume, T1 is the initial temperature (273 K at STP), V2 is the final volume, and T2 is the final temperature.
Plugging in the values:
10.0 L / 273 K = V2 / 546 K
By cross-multiplying and solving for V2, we get:
V2 = (10.0 L × 546 K) / 273 K
V2 = 20.0 liters
The new volume of H2(g) when heated to 546 K is 20.0 liters.
Final answer:
The new volume of H₂ gas at STP when heated to a temperature of 546 K is 20.0 liters.
Explanation:
To determine the new volume of H₂ gas at STP when heated to a temperature of 546 K, we can use the combined gas law equation:
V₂ = (P₁ × V₁ × T₂) / (P₂ × T₁)
Given that the initial volume (V₁) is 10.0 liters and the initial temperature (T₁) is 273 K (STP), we can substitute these values into the equation along with the given final temperature (T₂ = 546 K), and the pressure at STP (P₂ = 760 mm Hg). Solving for V₂, we get:
V₂ = (760 mm Hg × 10.0 L × 546 K) / (722.2 mm Hg × 273 K) = 20.0 liters
Therefore, the new volume of H₂ gas at STP when heated to a temperature of 546 K is 20.0 liters.
There are approximately 15 milliliters (mL) in 1 tablespoon (tbsp). Which expression can be used to find the approximate number of milliliters in 3 tbsp?
Answer : The approximate number of milliliters in 3 tbsp will be, 45 milliliters
Explanation :
Using the unitary method :
According to the question,
As, 1 tablespoon is present in 15 milliliters
So, 3 tablespoon is present in [tex]\frac{3\text{ tablespoon}}{1\text{ tablespoon}}\times 15\text{ milliliters}=45\text{ milliliters}[/tex]
Therefore, the approximate number of milliliters in 3 tbsp will be, 45 milliliters