Answer:
D. Down
Explanation:
The uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
What is nuclear fission?Nuclear fission is the process of splitting the nucleus of heavier atoms to produce two or more atoms of lighter nucleus with the release of large amounts of energy.
In order to slow down the fission reactions in its nuclear reactor, neutron absorbers are introduced and the uranium-containing rods are removed from the nuclear reactor.
Therefore, the uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.
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When forces are balanced, what affect does that have on the motion of an object?
Balanced forces cause no change in motion, even if the object is moving.
According to Newton’s 1st law, all objects remain stable unless acted upon by an unbalanced force, so this means that since the forces are balanced, the motion would remain at rest. If there was a greater force on one side of the object, then it would be pushed to the other side (ex. Pushing a heavy box from the right, makes it go left). I hope that helps...
Albert dressed as TWO-FACE flips a coin up in the air at an upward velocity of 5.00 m/s. He fails to catch it on the way down and it falls down an 8.5 m deep well. Calculate the maximum height and maximum magnitude (could be positive or negative) of velocity of the coin.
Answer:
1.28 m, 14 m/s
Explanation:
At the maximum height, the velocity is 0.
Given:
a = -9.8 m/s²
v₀ = 5.00 m/s
v = 0 m/s
x₀ = 0 m
Find:
x
v² = v₀² + 2a(x - x₀)
(0 m/s)² = (5.00 m/s)² + 2(-9.8 m/s²) (x - 0 m)
x = 1.28 m
The maximum speed is at the bottom of the well.
Given:
a = -9.8 m/s²
v₀ = 5.00 m/s
x₀ = 0 m
x = -8.5 m
Find:
v
v² = v₀² + 2a(x - x₀)
v² = (5.00 m/s)² + 2(-9.8 m/s²) (-8.5 m - 0 m)
v = -13.8 m/s
Rounded to 2 sig-figs, the maximum speed is 14 m/s.
A 2600 kilogram car is moving at a speed of 25m/s. How much kinetic energy does the car have
The kinetic energy of a 2600-kilogram car moving at a speed of 25 meters per second is 812,500 Joules.
Explanation:The kinetic energy of an object can be calculated using the formula: Kinetic Energy (KE) = 0.5 * mass * velocity2. In this case, the mass of the car is 2600 kilograms and the velocity is 25 m/s. Plugging these values into the formula, we get KE = 0.5 * 2600 kg * (25 m/s)2 = 812500 Joules. Therefore, the car's kinetic energy at that speed would be 812,500 Joules.
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A weightlifter lifts a 250-kg mass 0.5 meters above his head, how much PEg does the mass have (Note: g=9.8 m/s2)? Round your answer to the nearest whole number. J
Answer:
1225 J
Explanation:
The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by
[tex]PE=mgh[/tex]
where
m is the mass
g = 9.8 m/s^2 is the acceleration due to gravity
h is the height at which the object has been lifted
In this problem, we have
m = 250 kg
h = 0.5 m
So, the PE of the object is
[tex]PE=(250 kg)(9.8 m/s^2)(0.5 m)=1225 J[/tex]
Answer:
1225J
Explanation:
The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by
where
m is the mass
g = 9.8 m/s^2 is the acceleration due to gravity
h is the height at which the object has been lifted
In this problem, we have
m = 250 kg
h = 0.5 m
So, the PE of the object is
1225J
What is a circle graph used for?
A circle graph, or a pie chart is used to visualize information and data. A circle graph is used to easily show the results of an investigation in proportional manner. The arcs of a circle graph are prepositional to how many percent of population gave a certain answer
A circle graph is a graph in the form of a circle that's divided into pie pieces with each pie piece representing a part of the whole data set. In other words, each pie piece represents a percentage of the whole pie. Another word for a circle graph is a pie chart.
A circle graph is used to display data and it's used to recognize parts of a data set. It's useful to easily interpret what's going on in the scenario.
An example of a circle graph is provided in the image attached.
What does the slope of a distance vs. time graph indicate about an objects motion?
Answer:
Shape of a velocity versus time graph reveals pertinent information about an object's acceleration.
Explanation:
For example, if the acceleration is zero, then the velocity-time graph is a horizontal line (the slope is zero). The gradient of a distance-time graph represents the speed of an object. The velocity of an object is its speed in a particular direction. The slope on a velocity-time graph represents the acceleration of an object. The distance travelled is equal to the area under a velocity-time graph.
The curve of a velocity vs time graph reveals significant information about an object's acceleration.
What is a time velocity graph?The acceleration of the object is shown by the graph between velocity and time. Any object's acceleration is the variation in velocity with the passage of time. On the graph, this temporal variation with regard to velocity is shown.
For instance, if the acceleration is 0, the velocity-time graph is a horizontal line. (There is no slope.) The gradient on a distance-time graph corresponds to an object's speed.
The velocity of an object is its speed in a certain direction. The slope of a velocity-time graph represents an object's acceleration. The distance traveled is displayed on the underside of a velocity-time graph.
Therefore, a velocity versus time graph's shape provides important details about an object's acceleration.
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what is the SI unit of force?
The SI unit of force is the Newton .
1 Newton is the force that accelerates 1 kilogram of mass at the rate of 1 meter per second-squared.
1 pound of force is roughly 4.45 Newtons of force.
So 1 Newton of force is roughly 3.6 ounces of force.
1 kilogram of mass weighs about 9.81 Newtons on Earth. That's the same as 2.205 pounds.
Answer
the SI unit of force is newton
What are two main functions of the female reproductive system in the order in which they occur in the female life cycle
Answer:
Ovaries, the female reproductive organs, have two main functions: to produce female germ cells (called eggs or oocytes) and hormones (estrogen and progesterone), which regulate the function of the ovaries.
Two main functions of the female reproductive system are the Production of eggs and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.
What is the female reproductive system?The female reproductive system is a complex system of organs and structures responsible for the production of eggs (ova), the fertilization of eggs by sperm, the nourishment and development of a fertilized egg into a fetus, and the delivery of the fetus during childbirth.
The female reproductive system includes several organs and structures, including the ovaries, fallopian tubes, uterus, cervix, and vagina. The ovaries are responsible for producing and releasing eggs, while the fallopian tubes transport the eggs from the ovaries to the uterus, where fertilization can occur.
The uterus is a muscular organ that can expand during pregnancy to accommodate the growing fetus, and the cervix is the opening of the uterus that allows sperm to enter and the baby to exit during childbirth. The vagina is a muscular canal that connects the cervix to the outside of the body and serves as a passageway for menstrual flow and childbirth. Hormones such as estrogen and progesterone, which are produced by the ovaries and other organs, play an important role in regulating the female reproductive system.
Here in the Question,
The two main functions of the female reproductive system in the order in which they occur in the female life cycle are:
1. Production of eggs (ova) and preparation for fertilization: The female reproductive system begins to produce eggs during fetal development, and this process continues until menopause. The ovaries release a mature egg every month during the menstrual cycle, which is prepared for fertilization by the fallopian tubes, uterus, and cervix.
2. Nurturing and supporting a developing embryo or fetus: If the released egg is fertilized by sperm, it implants in the uterus and begins to develop into an embryo, which eventually grows into a fetus. The female reproductive system supports the developing embryo or fetus by providing it with oxygen and nutrients through the placenta. The uterus also expands to accommodate the growing fetus, and the cervix stays closed to protect it from infection. During childbirth, the uterus contracts to push the baby out through the vagina.
Therefore, Two main functions of the female reproductive system in the order in which they occur in the female life cycle are the Production of eggs (ova) and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.
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In each cycle, a heat engine an input of 1940 J of heat and exhausts 1480 J of heat. What is the thermal efficiency?
Answer:
0.237 (23.7 %)
Explanation:
The thermal efficiency of an engine is given by:
[tex]\eta=\frac{W}{Q_{in}}[/tex]
where
W is the useful work output of the engine
[tex]Q_{in}[/tex] is the heat in input
Here we have:
[tex]Q_{in}=1940 J[/tex]
and the work done is the total heat in input minus the heat exhausted:
[tex]W=1940 J - 1480 J=460 J[/tex]
So, the efficiency is
[tex]\eta=\frac{460 J}{1940 J}=0.237[/tex] (23.7 %)
Is the planet Jupiter magnetic.
Yes or no
Yes! The Planet Jupiter is Magnetic
Answer: yes
Explanation:
It is surrounded by a giant magnetic field called the megnetophere
Harry and Cassie wanted to conduct an experiment to see how many licks it takes to get to the center of a tootsie roll pop. Below is their procedure and above are the results.
1. Obtain test subject. 2. Obtain unwrapped tootsie roll pop. 3. Test subject places tootsie roll pop in center of tongue and drags it to the tip. This is considered one lick. 4. Test subject swallows. 5. Before licking again, the test subject rotates the tootsie roll pop slightly with each new lick to make sure that the entire pop obtains adequate licking surface area. 6. Test subject licks while keeping track of all licks until the tootsie roll is encountered. What is wrong with this experiment?
Hey there!
The answer is that The data was not reliable because there was not any repetition.
An experiment should be completed multiple times to be sure of accurate results.
A screenshot is attached.
Hope this helps! :)
Answer:
Actually, Kaylene M., the correct answer was D. You know:"The data is not reliable because there was not any repetition." The answer you have "screenshoted" I got the question wrong because of you. Thanks a lot.
Explanation:
NEED HELP ASAP
Which of the following is a monomer of DNA?
a. Protein
b. Oil
c. Nucleotides
Answer:i think the answer is c but monomers are found in anything that has dna in it and almost everything does.
Explanation:
Answer:
C) Nucleotides
Explanation:
In order to boil an egg, a student puts the egg in a pan of water and heats the pan on the stove. Which methods of the heat transfer are used to transfer the majority of the heat to the water and the egg?
Answer:
Convection (heat transfer from boiling water)
Conduction (heat transfer from the bottom the of pan)
Explanation:
Convection is heat flux through liquids and gases.
Conduction is heat flux through solid materials.
Radiation is heat flux through electromagnetic waves.
A turntable with a radius of 8cm rotates at 45 rpm. What is the linear speed of a point on the outside rim?
The linear speed of a point on the rim of a turntable rotating at 45 rpm with a radius of 8 cm is calculated by initially converting the rpm to radians per second, and then using the formula for linear speed. The resulting linear speed is 0.36 π m/s, which is about 1.13 m/s.
To calculate the linear speed of a point on the rim of a turntable rotating at 45 rpm with a radius of 8 cm, we need to use the relationship between angular velocity (in radians per second) and linear speed. First, we convert the rotation rate from rotations per minute (rpm) to radians per second. Since there are 2π radians in one rotation and 60 seconds in one minute, the conversion factor is 2π/60 radian/minute.
So, the angular velocity ω is:
ω = 45 rpm × (2π/60 rad/min) = 4.5 × π rad/s
Then, we use the formula for linear speed v which is:
v = rω
where r is the radius in meters (0.08 m for 8 cm), ω is the angular velocity in radians per second. Plugging in the values we get:
v = 0.08 m × (4.5 × π rad/s) = 0.36 × π m/s
Thus, the linear speed of a point on the outside rim of the turntable is 0.36 × π m/s, which is approximately 1.13 m/s.
How To Get To The Center OF The Moon And Time Travel ?
Answer:
To get to the moon you need to travel in a spacecraft and will take approximately 10 hours of travel.
Explanation:
Since the first spaceship to land on the moon in 1959 , several trips have been made so far.The NASA trip in 2006 opened more routes to the moon and achieved a time travel of 8 hours compared to the first one done in 1959 that was 34 hours of time travel.Currently, NASA has intiated programs that will see robots sent to the moon for research.
Hope this helps!
Suzie stands on a pedestal and touches the dome of a running Van de Graaf generator. In a few seconds she observes her hair standing on end. Explain this observation.
A)
Each hair was induced with a positive charge. Each hair repels against its neighbor and stands up.
B)
Each hair was induced with a positive charge. Each hair is attracted to its neighbor and stands up.
C)
Half of Suzie's hairs were charged negative, and the other half charged positive. The different charged hairs repel each other and stand up.
D)
Half of Suzie's hairs were charged negative, and the other half charged positive. The different charged hairs attract to each other and stand up.
Answer:A
Explanation:
Answer:
A)
Each hair was induced with a positive charge. Each hair repels against its neighbor and stands up.
Explanation:
When we touch the Van-de-Graff generator then due to high potential of the generator the charge is induced in our hairs.
Due to induction of charge in hairs all the hairs get similar charge and this similar charge is on each hair is along its whole length.
Now due to coulombs law all hairs are repelling each other due to similar nature of charge and this repulsion against each neighboring hair will stand the hairs upwards
so correct answer will be
A)
Each hair was induced with a positive charge. Each hair repels against its neighbor and stands up.
A cup falls off of a table from a height of 0.75m. What is the impact speed of the cup?
Answer:
3.822 m/s
Explanation:
You can solve this by using the kinematic equations:
[tex]v_{f} = v_{i}+gt[/tex]
[tex]d = v_it\times\dfrac{1}{2}gt^{2}[/tex]
Where:
Vf = final velocity (impact velocity)
Vi = initial velocity
g = acceleration due to gravity
d = distance traveled
t = time
Acceleration due to gravity on Earth is constant. Gravity accelerates objects towards the ground at 9.8m/s².
Initial velocity is always at 0 m/s in free fall. Let's see what we have as our given:
d = 0.75m
Vi = 0 m/s
g = 9.8 m/s²
Look at our equation for the impact velocity (Vf) with our current given plugged in:
[tex]v_{f}=v_{i}+gt[/tex]
[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]
We still do not have time. That is where the second equation comes in. We plug in our values again in the secon equation and derive time:
[tex]d=v_{i}t+\dfrac{1}{2}gt^{2}\\\\0.75m=0m/s(t)+\dfrac{1}{2}(9.8m/s^{2})(t^{2})\\\\0.75m = 0+(4.9m/s^{2})(t^{2})\\\\\dfrac{0.75m}{4.9m/s^{2}}=t^{2}\\\\\sqrt{ 0.15s^{2}}=\sqrt{t^{2}}\\\\0.39s=t[/tex]
So our time is 0.39s. Now we use this in our first equation:
[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]
[tex]v_{f}=(9.8m/s^{2}(0.39s)[/tex]
[tex]v_{f}=3.822m/s[/tex]
Why do solar cells need an inverter?
Answer:
Because solar cell produces DC (Direct current) electricity.
Explanation:
Most of the appliances and the electricity grid works on the Alternating Current (AC) electricity. The solar cells produces DC which are not usable until that is converted into AC. For this purpose inverters are used which convert the DC to AC and thus making Solar energy usable for home appliances.
An inverter is necessary in a solar power system to convert the DC electricity produced by the solar panels into the AC electricity required for most electrical applications. Therefore solar cells need an inverter because their energy output is alternating current. Option A is the answer.
Why solar cells need invertersSolar cells, or photovoltaic (PV) cells, employ the photovoltaic effect to convert sunlight into direct current (DC) electricity. However, household and grid electricity systems mainly use alternating current (AC) due to its suitability for transmission and powering diverse appliances. Solar generated DC electricity needs conversion to AC through an inverter in solar power systems.
This device plays a crucial role by transforming the solar panel's DC output into the appropriate AC waveform and voltage level. This conversion ensures compatibility with the electrical grid and allows utilization by appliances and lighting.
Essentially, the need for inverters stems from solar cells' DC generation, contrasting with the prevalent AC based infrastructure and device requirements.
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Question
9. Why do solar cells need an inverter? Please explain.
A. Their energy output is alternating current.
B. They need a way to store energy for cloudy days.
C. They need a way to share their excess energy with the electric company.
D. Their energy output is direct current.
a train is moving at a constant speed on a surface and inclined at 10 degrees with the horizontal travels a distance of 400 m in 5 Seconds. calculate the vertical velocity component of the train during the time period.
Answer:
13.9 m/s
Explanation:
The velocity of the train along the inclined surface is given by the ratio between the distance travelled, d, and the time taken, t:
[tex]v=\frac{d}{t}[/tex]
where we have
d = 400 m
t = 5 s
Substituting,
[tex]v=\frac{400 m}{5 s}=80 m/s[/tex]
This is the velocity of the train along the inclined plane. Now we can find the vertical component of the velocity by using the formula:
[tex]v_y = v sin \theta[/tex]
where [tex]\theta=10^{\circ}[/tex] is the angle of the slope. Substituting, we find
[tex]v_y = (80 m/s)(sin 10^{\circ})=13.9 m/s[/tex]
(please answer fast)
In which layer of a rock would the oldest fossils, such as this one, be found?
A) lowermost
B) middle
C) stratosphere
D) uppermost
Answer:
Lowest
Explanation:
Law of superposition
The correct answer is A) lowermost.
The principle of superposition states that in an undisturbed sequence of sedimentary rocks, each layer is younger than the one below it and older than the one above it.
This means that the oldest fossils would be found in the lowermost layer of sedimentary rock, as it was deposited first. Over time, newer layers of sediment accumulate on top, preserving the older layers and the fossils they contain.
Therefore, the oldest fossils would be located in the oldest layer, which is the lowermost one. Options B, C, and D would contain progressively younger fossils, with the uppermost layer containing the youngest fossils.
The stratosphere (option C) is not a layer of rock but rather a layer of Earth's atmosphere, making it an incorrect choice for finding fossils."
Which of the following is true about genes?
A.
Genes are made up of smaller molecules known as chromosomes.
B.
The genes of a particular organism can never change throughout its lifetime.
C.
Genes are responsible for all the traits of an organism.
D.
In humans, genes are passed to an offspring from two parents.
D. In humans, genes are passed to an offspring from two parents.
In humans, genes are passed to an offspring from two parents. Hence, option (D) is correct.
What is gene?The fundamental structural and operational component of heredity is a gene. DNA is the component of genes. Some genes serve as blueprints for the synthesis of proteins. Many genes do not, however, code for proteins. A few hundred DNA bases to more than 2 million bases make up a gene in a human.
Humans are thought to have between 20,000 and 25,000 genes, according to the Human Genome Project, an international research project that aimed to decipher the human genome's sequence and catalogue its genes.
Every gene is present in two copies, one from each parent, in every individual. Less than 1% of all genes are slightly varied between individuals, but the majority of genes are the same in all people.
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What is the wavelength of a wave if the wave speed is 24 m/s and the frequency is 48 Hz?
Answer:
Wavelength is 0.5
Explanation:
To work it out, you divide Wave speed by the Frequency (24÷48=0.5)
Answer:
wavelength = 0.5 meters
Explanation:
Wavelength is the distance between successive trough or crest of a wave. Wavelength is inversely proportional to frequency. This means the shorter the wavelength the higher the frequency .The S.I unit of wavelength is meters.
Wavelength can be represented with a Greek symbol known as lambda (λ).
The formula below can be use to represent wavelength .
λ = v/f
where λ = wavelength
v = velocity
f = frequency
v = 24m/s
f = 48 Hertz
λ = 24/48
λ = 0.5meters
According to the cooling curve, what is the approximate freezing point of the substance?
The freezing point of a substance in a cooling curve can be determined at the temperature where the substance transitions from its liquid phase to its solid phase. The freezing point may, however, be depressed in the presence of solutes. Freezing point depression is one of the colligative properties that depend on the quantity of solute particles rather than their identity.
Explanation:The freezing point of a substance in a cooling curve can be determined at the point where the substance begins to transition from its liquid phase to its solid phase. The freezing point represented on the cooling curve is the temperature at which this phase transition occurs. For instance, pure water freezes at 0 °C (32 °F) under normal atmospheric pressure.
In some cases, this freezing point may vary, e.g., the freezing point of benzene is 5.5 °C. For a solution, the freezing point might be lower due to the presence of solutes; this is known as the freezing point depression. In other words, substances such as salt or sugar when mixed with water lower its freezing point, a concept used in daily life, such as making homemade ice cream or de-icing roads in winter.
For example, a solution of benzene and HCl showed a freezing point depression (ΔTf) of 5.1 °C, implying that the freezing point of the solution was lower than the pure solvent. Therefore, the freezing point of a substance can be approximated using cooling curves, considering other properties such as pressure and presence of solutes.
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Think about Redi's experiment described above. It was one step in building cell theory. What aspect of cell theory did Redi's experiment support?
A) All cells come from pre-existing cells.
B) Cells are the smallest and most basic unit of life.
C) All living things are composed of one or more cells.
D) The cell is the functional unit of all living things.
Answer:
A. All cells come from pre-existing cells
Explanation:
Francesco Redi's experiments aimed to test spontaneous generation, where life could emerge from non-living things. His first round included two groups of jars with raw meat in it. He covered one group with a thin cloth, allowing only air to get in, and the other group was left open.
In the jars left open, he noted maggots were present and the one that was covered contained no maggots.
The results indicated that the maggots only formed because flies laid their eggs on it and maggots developed. He did note that some maggots developed on the cloth itself, but on the outside.
Thus, he contributed in disproving spontaneous generation by showing that maggots only developed from the eggs that flies laid. This supports that all cells come from pre-existing cells.
Answer:
A)
Explanation:
2. What characteristics does the domain Bacteria have
Answer: Streptococcus.
Explanation:
The Bacteria and Archaea domains are prokaryotes, they contain no nuclues or organelles, only a circular chromosome. They cannot form multicells organisms. Archaea can be found in extreme evironments, such as hot springs and deep sea vents.
When you do work on something, you give it energy
A rock is dropped from a height of 2.5 meters. What is it’s velocity when it reaches the ground? 3.5 meters/second
Answer:
7.0 m/s
Explanation:
The question is on Free-Fall
In a free fall, an object falls freely without only gravity acting on it. Velocity at the top is zero m/s
Height of fall, h=1/2gt²
Velocity, v=gt where g is gravity acceleration=9.8m/s² and t is time taken fall the fall
Finding the t taken for the fall;
h=2.5m but we know h=1/2gt²⇒substitute values in this equation
2.5=1/2×g×t²
2.5=1/2×9.8×t²⇒2.5=4.9t²
make t subject of the equation;
t²=2.5/4.9
t=√2.5/4.9 =0.7143sec
Finding the velocity
v=gt
v=9.8×0.7143=7m/s
Which of these is a chemical property of a substance
Density color reactivity or melting point
Question:
Which of these is a chemical property of a substance?
A) Density
B) Color
C) reactivity
D) melting point
Answer:
C) Reactivity
Explanation:
We identify Reactivity as a chemical property because it dose Change to the chemical nature of matter such as change the way why the earth looks. One example of Reactivity is when we have earthquakes. But Things like Density, Melting point and color are signs of Physical properties because they do not change the chemical nature of matter.
The answer would be reactivity
Which image depicts projectile motion?
Answer:
the answer is the second one
Explanation:
the person is moving through the air while the other people are either not moving forward or backwards or on the ground with full controll over where they go
Answer:
Second picture is representing projectile motion
Explanation:
As we know that in projectile motion one of the component of the motion of object will remains constant while other component which is vertical in direction will change due to gravity.
So here in this type of motion the path of the object is same as the parabolic path.
Here we know that vertical component of the motion will change due to gravity while horizontal component will remain constant always
So here we can say that
correct image is second image
The mass of an object is 201 g The object requires 150J to raise its temperature by 100°C. What is the specific heat of the object?
7.46 J/kg-K
0.00130 J/kg - K
3,020,000 J/kg . K
1500 J/kg . K
7.46J/kg-k is the correct answer
The specific heat of the object is approximately 0.746 J/g °C.
Explanation:The specific heat of an object is the amount of heat required to raise the temperature of 1 gram of the substance by 1 degree Celsius. To calculate the specific heat of the object, we can use the formula:
Specific heat = ΔQ / (mass × ΔT)
Given that the mass of the object is 201 grams and it requires 150 Joules of heat energy to raise its temperature by 100°C, we can substitute the values into the formula:
Specific heat = 150 J / (201 g × 100 °C)
Simplifying the expression, we get a specific heat of approximately 0.746 J/g °C or 7.46 J/kg-K.
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