Answer:
the answer is true
Explanation:
Both equations are derived from the density formula, hence it is TRUE that they are equal.
In order to know whether the two formulas are equivalent, we need to determine the formula for calculating the density of a substance
Density = Mass/Volume
D = m/V
Make V the subject of the formula
[tex]D = \frac{m}{V}\\DV = m\\[/tex]
Divide both sides by D
[tex]\frac{DV}{D} =\frac{m}{D}\\ V = \frac{m}{D}[/tex]
Since both equations are derived from the density formula, hence it is TRUE that they are equal.
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Which image illustrates the bending of a wave around the edge of an
obstacle?
Answer: C
Explanation:
Calculate the equivalent resistance of the circuit below.
Answer:
30Ω
Explanation:
To calculate the equivalent resistance in the circuit, do the following:
Step 1:
10Ω and 20Ω are in series connection. Therefore their equivalent is: 10 + 20 = 30Ω
Step 2:
The equivalent resistance (30Ω) obtained from the above is in parallel connection with 30Ω resistance shown in the diagram above.
Therefore their equivalent is given by:
1/30 + 1/30 = 2/30 = 1/15.
Now invert to obtain the equivalent
Therefore, the equivalent is 15Ω
Step 3:
Determination of the overall equivalent of the resistance of the circuit.
The new equivalent resistance 15Ω obtained above is in series connection with 15Ω resistance in the diagram above.
Therefore their equivalent is given by:
15Ω + 15Ω = 30Ω
Therefore, the equivalent resistance in the circuit is 30Ω
12 kg of gold at 90°C cools to 20°C. How much heat is
given off?
Please help :)
Final answer:
The gold releases 109,200 joules of heat as it cools from 90°C to 20°C. The specific heat capacity of gold (0.129 J/g°C) and the mass of the gold (12 kg) were used to calculate the heat transfer.
Explanation:
To calculate how much heat is given off when 12 kg of gold cools from 90°C to 20°C, we use the formula for heat transfer Q = mcΔT, where m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
First, we need the specific heat capacity of gold, which is 0.129 J/g°C. Since the mass of gold is given in kilograms, we need to convert it to grams (1 kg = 1000 g). The mass of the gold is 12000 g (12 kg * 1000 g/kg).
The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 20°C - 90°C = -70°C.
Now we can calculate the heat transfer:
Q = m * c * ΔT
Q = 12000 g * 0.129 J/g°C * (-70°C)
Q = -109200 J
Negative sign indicates that the heat is released. Thus, the gold releases 109,200 joules as it cools.
What would be a clean energy replacement for the dam’s hydroelectric power?
Answer:
solar panels
Explanation:
What happens to the magnetic force as the distance between two magnetic poles decreases
It remains constant
It decreases
It increases
It decreases then increases.
Answer: It will increase
The magnetic force increases as the distance between two magnetic poles decreases due to the greater strength of the magnetic field when closer together.
As the distance between two magnetic poles decreases, the magnetic force increases. This is because the strength of the magnetic field from a magnet decreases with distance. When two magnetic objects are brought closer together, the field strength at each object due to the other's pole becomes greater, which results in a stronger magnetic force between them. The relationship between magnetic force and distance is similar to that of electric forces and can be thought of in the same way as Coulomb's Law for electric charges, where the force decreases with the square of the distance between the charges.
In practical terms, when you bring a magnet closer to a piece of iron, the magnetic potential energy of the system decreases because the magnet is moving to a lower potential energy state as it is attracted to the iron. Conversely, if you push two repelling magnets together, their magnetic potential energy increases because work is done against the repulsive force.
A circuit has a voltage drop of 60.0 V across a 120.0 resistor that carries a current of 0.500 A. What is the power conducted by the resistor? Use P = VI.
A.
7200 W
B.
60.0 W
C.
2.00 W
D.
30.0 W
Answer:
Power, P = 30 W
Explanation:
We have,
Voltage drop of a circuit is 60 V
Resistance of the resistor is 120 ohms
Current across the circuit is 0.5 A
It is required to find the power conducted by the resistor. Power conducted by a resistor is given by :
[tex]P=VI[/tex]
V and I are voltage and current
[tex]P=60\times 0.5\\\\P=30\ W[/tex]
So, the power conducted by the resistor is 30 watts.
Answer:
D. 30.0 W
Explanation:
Quiz Taken
for a large atom, which of the following would give the most stable nuclear configuration?
A.)An equal number of neutrons and protons
B.)More neutrons than protons
C.)More protons than neutrons
D.)An equal number of protons and electrons
My answer is D but I will still try to word it out again
Answer:D
Explanation:
Hope it helps
When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to ____________________.
Answer:
Disease and insects
Explanation:
Carving into tree bark opens the tree to risks such as insect infestation, diseases like Dutch elm disease and chestnut blight, and environmental stress factors.
When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to insects, disease, and other environmental stresses. The tree's bark is a protective barrier, and when it's damaged, harmful organisms and factors can penetrate and cause various kinds of damage. For instance, small mammals like rodents may chew the bark further, insects such as borers can burrow into the tree's cambium, and fungal diseases can infect the tree leading to potential decay or even the tree's death.
In more severe cases, this kind of damage might enable more aggressive pathogens such as the ones responsible for Dutch elm disease or chestnut blight to enter the tree. These diseases have had a significant impact on tree populations in the U.S., causing economic and aesthetic losses. Additionally, damage to the bark can increase the likelihood of environmental stress impacts, such as damage from freezing temperatures or physical injury from larger mammals.
It takes 20s for 3x10^6 electrons to flow through a wire ,what is the current?
Answer:
Explanation:
The variables we know and are given are:
time, t = 20s
Charge, Q = 3x1-^-6 electrons, which is just 3x10^-6C (C stands for Coulombs, which is the unit for Charge)
We need to find the current, I, and since we know Q and t we can substitute these values into the given equation:
I=Q/t (which if you look at what the RHS is saying, its Charge over time, or more literally means the amount of charge passing a point over a period of time)
If we substitute these values, we will get I as:
I = Q / t
I = 3x10^-6 / 20
I = 1.5x10^-7 A
Hope this helps!
object moving at a constant velocity will always have a
Answer:
object moving at a constant velocity will always have a
Zero acceleration
Answer:
Zero Acceleration
Explanation:
Correct on Edge
The diagram shows the set-up for an electric doorbell. At bottom, a doorbell. Starting from midright, a wire attached to a contact screw runs to a power source and then to a bell and then to coil around both arms of a U shaped iron core. The coils plus core is labeled electromagnet with the lower arm of the core labeled N and the upper arm labeled S. The wire emerges from the coils to attach to a steel bar at its top end. The bottom end of the steel bar has a short piece of wire leading to a striker. Which best explains why the bell would not ring in this set-up? The circuit is open. The electromagnet has an iron core. The circuit is closed. The electromagnet is made of steel.
The statement which best explains why the bell would not ring in this set-up is "The circuit is open." The correct option is A.
What is circuit open?An open circuit is a circuit where the continuity has been broken, meaning there is a break in the path that the electrons travel on. This can be caused by a switch being turned off, a wire becoming disconnected, or a component in the circuit failing. Without a complete path for the electrons to flow, the circuit is considered "open" and no current can flow. As a result, any devices or components in the circuit will not function.
Here in the Question,
An electric circuit needs to be closed in order for the current to flow and for the doorbell to ring. In this setup, the wire attached to the contact screw needs to be connected to the wire attached to the steel bar in order to close the circuit. If the circuit is open, there will be no current flowing and the bell will not ring.
Option B is not correct because the electromagnet having an iron core is necessary for the doorbell to work. The electromagnet is created by the U-shaped iron core with coils of wire around it. When current flows through the wire, it creates a magnetic field that attracts the steel bar, causing the striker to hit the bell.
Option C is not correct because a closed circuit is necessary for the doorbell to work, not an open circuit.
Option D is not correct because the electromagnet needs to be made of iron or another ferromagnetic material, not steel, in order to create a strong magnetic field.
Therefore, The correct answer is Option A.
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Answer: The answer would indeed be A.
Explanation: I Hope this Helps!
A 2.0-kg ball rolls to the right at 3.0 m/s. A 4.0-kg ball rolls to the left at 2.0 m/s . What is the momentum of the system after a head-on collision of the two balls?
Answer:
Final momentum after a head on collision is -2kgm/s
Explanation:
One ball moves to the right and the other moves opposite and momentum is a vector quantity so that considering the direction
Initial momenta are P₁=2x3=6kgm/s P₂=4x(-2)=-8kgm/s
Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s
The final momentum after a head-on collision is -2kg-m/s if the 2.0-kg ball rolls to the right at 3.0 m/s. A 4.0-kg ball rolls to the left at 2.0 m/s.
What is mass?A tangible body's mass is the amount of matter it possesses. It's also a metric of inertia or the resistance to velocity when a net force is exerted.
It is given that:
A 2.0-kg ball rolls to the right at 3.0 m/s. A 4.0-kg ball rolls to the left at 2.0 m/s.
As we know,
Momentum = mass×velcoity
Given that momentum is a vector number and that one ball goes to the right while the other moves in the opposite direction
Initial momenta:
P = 2×3
P = 6 kg-m/s
p = 4×(-2)
p = -8 kg-m/s
Final momentum = The vector sum of P(final)
= 6 - 8
= -2 kg-m/s
Thus, the final momentum after a head-on collision is -2kg-m/s if the 2.0-kg ball rolls to the right at 3.0 m/s. A 4.0-kg ball rolls to the left at 2.0 m/s.
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If the strength of the magnetic field at A ls 200 units and the strength of the magnetic field at B is 50 units, what is the
distance to B?
SLO
sham
2009 Odyw
e , no
20 units
100 units
400 units
10 units
Answer:
100 units
I hope this helps you
The table below describes 100 offspring of the same two parents. What are the most likely genotypes of the parents?
Data table
A. Ff Ee and ff ee
B. ff Ee and ff ee
C. Ff Ee and Ff Ee
D. FF EE and ff ee
Answer:
A. Ff Ee and ff ee
Explanation:
The table shows approximately equal numbers of black-fur and white-fur offspring, as well as approximately equal numbers of black-eyed and red-eyed offspring. If one parent is Ff Ee and the other is ff ee, the second parent will only contribute recessive genes (f and e) to the offspring. The first parent will contribute F alleles to about half of its offspring, and f alleles to the rest, resulting in similar numbers of black fur (Ff) and white fur (ff) offspring. The same logic applies to eye color. Of the remaining answers, B is not possible because all of the offspring of these parents will have white fur. D is not possible because all of the offspring will inherit an F and an E from the first parent, so all will have black fur and black eyes. Choice C is a possible answer, but that parent combination should result in about 3/4 black-fur offspring, and 3/4 black-eye offspring.
Which of the following is a unique feature of the Earth's environment that aerospace engineers needed to imitate on a spacecraft in order to make manned spaceflight possible?
A. The Earth has a strong magnetic field.
B. The Earth has an atmosphere rich in carbon dioxide and hydrogen.
C. The Earth has a strong gravitational field.
D. The Earth has an atmosphere rich in nitrogen and oxygen.
Answer: The answer is B
Explanation:
The Earth has an atmosphere rich in nitrogen (78%) and oxygen (20%). Aerospace engineers have designed systems that supply astronauts with air that is very similar in composition to Earth's atmosphere. This means that the air fed into spacecraft is mostly nitrogen and oxygen.
The correct statement is " The Earth has an atmosphere rich in nitrogen and oxygen." The correct option is D.
What does Earth's atmosphere contain?The Earth's atmosphere is rich in nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases. This atmosphere provides a number of benefits that are critical for human spaceflight, including:
Protection from solar radiation: The Earth's atmosphere shields us from harmful solar radiation, which can cause DNA damage and increase the risk of cancer. Without this protection, astronauts would be at a much higher risk of radiation sickness and other health problems.
Regulation of temperature: The Earth's atmosphere helps to regulate the planet's temperature by trapping heat from the sun and preventing it from escaping into space. In the absence of an atmosphere, spacecraft would rapidly heat up or cool down, making it difficult to maintain a comfortable temperature for human occupants.
Breathing air: The Earth's atmosphere provides a ready source of breathable air, which is essential for human life. By imitating the composition of the Earth's atmosphere inside a spacecraft, astronauts can breathe comfortably without the need for bulky oxygen tanks or other life support systems.
In contrast, the other options are not unique features of the Earth's environment that are critical for human spaceflight:
A. The Earth has a strong magnetic field: While the Earth's magnetic field provides some protection from solar radiation, it is not essential for human spaceflight. In fact, spacecraft often use the lack of a magnetic field in space to perform scientific experiments that would be difficult or impossible to conduct on Earth.
B. The Earth has an atmosphere rich in carbon dioxide and hydrogen: While carbon dioxide and hydrogen are important components of the Earth's atmosphere, they are not critical for human spaceflight. In fact, carbon dioxide is often considered a pollutant that must be removed from the air inside a spacecraft, while hydrogen is a highly flammable gas that poses a safety risk.
C. The Earth has a strong gravitational field: While gravity is certainly important for human spaceflight, it is not unique to the Earth's environment. In fact, spacecraft can simulate the effects of gravity using centrifugal force, and some proposals for long-duration space missions involve using artificial gravity to counteract the negative effects of zero gravity on the human body.
Therefore, The correct option is D. The Earth has an atmosphere rich in nitrogen and oxygen.
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The brakes on a bicycle apply 95 N of force to the wheels. When the
brakes are applied, the bicycle comes to a stop in 16 m. How much work
are the brakes doing on the wheels?
The work done by the bicycle brakes is calculated by multiplying the braking force of 95 N by the stopping distance of 16 m, resulting in 1520 joules of work done.
To calculate the work done by the brakes on the bicycle, we need to use the work-energy principle. Work is defined as the force multiplied by the distance over which the force is applied, provided the force is applied in the direction of the movement. The formula for work is:
Work (W) = Force (F) times Distance (d)
In this case, the brakes apply a force of 95 N to the wheels, and the bicycle comes to a stop in 16 m. Therefore, the work done by the brakes is:
W = 95 N times 16 m = 1520 J (joules)
Since the direction of the braking force is opposite to the direction of motion, and the bicycle comes to a stop, the entire work done by the brakes is used to dissipate the bicycle's kinetic energy as heat and other forms of energy due to friction.
Describe what happens to the energy of a wave if the frequency decreases and the frequency increased
"As frequency increases, wavelength decreases. Frequency and wavelength are inversely proportional. This basically means that when the wavelength is increased, the frequency decreases and vice versa. Wavelength is described as the distance between a trough to a trough or a crest to a crest."
I'd recommend paraphrasing it tho.
7. In the free-body diagram shown to the right,
which of the following is the gravitational force
acting on the car?
a. 5800 N
c. 14 700 N
b. 775 N
d. 13 690 N
5800 N
275 N
-
14 700 N
Answer:
the answer is 14700 NExplanation:
because gravitational forcean attractive force exists between all objects with mass
In the free-body diagram shown to the right, the gravitational force acting on the car is 14 700 N. Hence option c is correct.
What is gravitational force?Gravitational force is defined as the magnetic pull that the earth has on all other objects in the universe. Your body is kept on the ground by this force. Gravity, however, draws all mass-bearing objects in the same direction.
List every force influencing the thing. The object's free body diagram should be drawn. Identify the positive and negative directions. Add the forces in the positive direction and subtract the forces in the negative direction. The combined effect of all pushing and pulling forces that are actually acting on an object is known as the net force.
Thus, in the free-body diagram shown to the right, the gravitational force acting on the car is 14 700 N. Hence option c is correct.
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A wave travels at a constant speed. How does the wavelength change if the
frequency is increased by a factor of 2? Assume the speed of the wave
remains unchanged.
O
A. The wavelength decreases by a factor of 2.
O
B. The wavelength increases by a factor of 2.
O
c. The wavelength does not change.
O
D. The wavelength increases by a factor of 4.
SUBMIT
Answer:
A is the correct answer
Explanation:
just did the test
The correct answer is option A. The wavelength decreases by a factor of 2.
What is a wavelength example?Wavelength is the distance between the crests of waves or a person's general attitude. An example of wavelength is the distance between the crest of two waves. An example of wavelength is when you and another person share the same general attitude and can thus communicate well. The distance between crests of a wave.
How does wavelength affect light?Both Wave 1 and Wave 2 have the same wavelength but different amplitudes. The wavelength of light is an important property for it is this that determines the nature of the light. Red light has a different wavelength from that of blue light and green light has a different wavelength from both of them.
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Electrons flowing into a resistor make that end
A. positive with respect to the other end
B. negative with respect to the other end
C. higher in resistance
D. extremely warm
Answer:
negative with respect to the other end
Explanation:
Electrons are subatomic particle which carries negative charge. They are attributed to carry the electrical charges in solids.
Since electron carries negative charge , if it flows to one end of resistor then that end will have negative charge on it. Also other end has no charge so, if we compare both the ends . End with electrical charge is negative with respect to other end .
When describing image formation in lenses, what is the angle of incidence?
A. The angle the light ray makes in the medium with a lower index of
refraction.
O
B. The angle the light ray makes as it strikes the surface.
) C. The angle the light ray makes in the medium with a higher index of
refraction
D. The angle the light ray makes as it leaves the surface.
Answer:
The angle the light ray makes as it strikes the surface.
Explanation:
When describing image formation in lenses, the angle of incidence is the angle the light ray makes as it leaves the surface.
What is angle of incidence?The angle with which the light ray is falling on the surface, measured from the horizontal s called the angle of incidence.
Thus, when describing image formation in lenses, the angle of incidence is the angle the light ray makes as it leaves the surface.
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Give an example of a question that can be answered by science and a question that could be better answered by philosophy.
Answer:
"Where are we?" versus "Why are we here?" is a common example. We may never be able to explain why we exist or for what purpose we exist, but we can point to a map or coordinates and produce scientific evidence of where we are.
Explanation:
What temperature a water boil is a question of science, and what purpose life serves is a question of philosophy.
What degree does water begin to boil?
The answer is that at sea level, water boils at 100 degrees Celsius (212 degrees Fahrenheit).
Because it includes a quantifiable and reproducible phenomenon, this query falls under the purview of science. It can be resolved through experimental observations and the use of scientific ideas, particularly the comprehension of the physical characteristics of water and how they alter with temperature and pressure.
What purpose does life serve?
The answer varies depending on personal ideas, values, and philosophical viewpoints.
Given that it involves arbitrary interpretations of the meaning of life and abstract notions, this question is best suited for philosophy. It goes into more profound existential and philosophical questions that science, as an approach based on empirical observation and investigation, may not be able to answer. This is an issue that requires personal reflection and introspection rather than being something that can be objectively measured or demonstrated using scientific methods because the answer may vary for many individuals and philosophical systems.
Hence, What degrees a water boil is a question of science, and what purpose life serves is a question of philosophy.
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5. Electromagnetic radiation travels at a speed of 3.0 x 10^8 m/s.
a) What is the wavelength of a radio wave that has a frequency of 3.5 x 10^5 Hz? b) What is the frequency of an X-ray that has a wavelength of 2.5 x 10^-10 m?
Answer:
a=805714*10^2
b=1.2*10^18
Explanation:
a) v=lf
Where l is wavelength sorry can't draw it
3*100000000=l*350000
L=8. 5714*10^2
b) v=lf
300000000=0.00000000025f
f=1.2*10^18
How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)
A. 0.008 s
B. 8 s
C. 120 s
D. 1,785,000 s
Answer:
I think it's A. 0.008 s
Explanation:
divide 15,000 w/0.008 s
=1,875,000
PLEASE SOMEONE ANSWER THIS
How are water turbines and windmills similar?
They both change the direction of motion.
They both use rotary motion.
o They both can be used to generate electricity.
All of the above.
Answer:
i want to say all of the above but not sure
Explanation:
Answer:
All of the above
Explanation:
What is the wavelength of a beam of light traveling through a vacuum with a frequency of
1.5 * 1012Hz? The speed of light in a vacuum is 3.00 x 108m/s.
5.0 x 10*m
2.0 x 104m
5.0 x 10 m
2.0 x 103m
5.0 x 10^m
The wavelength of the given light is required.
The wavelength of the light is [tex]2\times 10^{-4}\ \text{m}[/tex]
v = Velocity of light = [tex]3\times 10^8\ \text{m/s}[/tex]
f = Frequency = [tex]1.5\times 10^{12}\ \text{Hz}[/tex]
Wavelength is given by
[tex]\lambda=\dfrac{v}{f}[/tex]
[tex]\Rightarrow \lambda=\dfrac{3\times 10^8}{1.5\times 10^{12}}[/tex]
[tex]\Rightarrow \lambda=2\times 10^{-4}\ \text{m}[/tex]
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The wavelength of the light is 2.00 × [tex]10^{-4 }[/tex]meters.The correct option is Option B ( 2.00 × [tex]10^{-4 }[/tex] meters ).
To find the wavelength of a beam of light traveling through a vacuum with a frequency of 1.5 × [tex]10^{12}[/tex] Hz, we use the equation that relates the speed of light (c), frequency (f), and wavelength (λ):
c = f×λGiven that the speed of light in a vacuum (c) is 3.00 × [tex]10^8[/tex] m/s, we rearrange the equation to solve for wavelength (λ):
λ = c / fSubstitute the values into the equation:λ = (3.00 × [tex]10^8[/tex] m/s) / (1.5 × [tex]10^{12}[/tex] Hz)Perform the division:λ = 2.00 × [tex]10^{-4}[/tex] mTherefore, the wavelength of the light is 2.00 × [tex]10^{-4}[/tex] meters.
Susan is making an electromagnet in her science class today. First, she takes a nail and winds coils of copper wire around it then, she
connects the ends of the wire to a battery. She uses the electromagnet to pick up paper clips, but the paper clips drop when she
disconnects the wires from the battery, Which kind of energy does Susan change into magnetic energy in this project
chemical
electrical
heat
light
Answer:
Electrical
Explanation:
She uses a battery, which is electrical.
It doesn't operate using chemicals, heat, or light
Answer:
it's chemical and electrical because she uses her circuit in which the both forms take place...........so according to me the most probably the answer is electrical.....
Explanation:
because she uses her circuit in which the both forms take place...........so according to me the most probably the answer is electrical.....
The density for potassium is 0.856 g/cm3. What would be the mass of a 40 cm3 piece of potassium?
A. 68.48g
B. 46.73g
C. 34.24g
D. 34g
Answer:
38.52g
Explanation:
Answer:
34.24g
Explanation:
for study island said I got it correct.
Where is the epicenter of the earthquake located?
Answer:
The surface where they slip is called the fault or fault plane. The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks.
When a wire loop is connected to a battery, what is produced in the loop?
Answer:
magnetic field
Explanation:
Answer:
magnetic field
Explanation: