Answer:
false
Explanation:
we can only see wavelengths on the visible light spectrum. everything else is invisible to us
The part of the electromagnetic spectrum that the human eye can detect is divided into ultraviolet light, visible light and infrared light. This is false statement.
What is electromagnetic radiation?Electromagnetic waves, which are synchronized oscillations of the electric and magnetic fields, are the traditional form of electromagnetic radiation. The electromagnetic spectrum is created at various wavelengths depending on the oscillation frequency. Electromagnetic waves move at the speed of light, typically abbreviated as c, in a vacuum.
The oscillations of the two fields create a transverse wave in homogeneous, isotropic media when they are perpendicular to each other, perpendicular to the direction of energy and wave propagation, and perpendicular to each other.
Hence, the part of the electromagnetic spectrum that the human eye can detect is visible light.
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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.
Wood burning is a chemical reaction. However, wood does not just spontaneously catch on fire. It needs ____________ to begin the chemical reaction.
A) Chemical Energy
B) Physical Energy
C) Electron Energy
D) Activation Energy
Answer:
A chemical energy
Explanation:
This is the answer
Two boats are anchored in the harbor, separated by a horizontal distance of 18 m. The boats bob up and down as waves enter the harbor. When one boat is at its highest point, the other is at its lowest point and there is one wave crests between them. Each boat makes exactly 2 complete up-and-down cycles every 16.0 s. The vertical distance between a boat's highest and lowest position is 3.6 m.
Final answer:
The amplitude of a wave is half the height from peak to trough, so a 2 m crest above still water has an amplitude of 1 m. A seagull bobbing every 2 seconds between 3 m apart crests experiences a wave velocity of 1.5 m/s. A boat hit by a 2 m high wave peak will change elevation by 2 m.
Explanation:
The question provided is related to the physics of waves, specifically their propagation, amplitude, frequency, and wavelength. When discussing a wave crest measuring 2 m above the still water mark, the amplitude of the wave is actually 1 m, as the amplitude corresponds to the maximum displacement from the equilibrium (still water level) to the peak of the wave, which would be half of the peak-to-trough height.
Therefore, if a wave's crest is 2 m above the still water mark, and assuming the trough is the same distance below, the amplitude is 1 m.
Similarly, for a seagull bobbing up and down on the water's surface, if it does so once every two seconds and the distance between two crests of the water wave is 3 m, the velocity of the wave would be 1.5 m/s (wavelength divided by the period: 3 m / 2 s = 1.5 m/s).
Regarding a boat that bobs up and down due to wave action, if the height of the wave is 2 m, the boat's height will change by 2 m when hit by the peak of the wave, considering the change from the equilibrium position to the peak.
Which wheel and axle would allow a load of rocks to be dragged with less force?
Two wheel and axles
A. Wheel and axle A.
B. Wheel and axle B.
C. Both devices would require the same amount of force.
D. Not enough information
Both devices would require the same amount of force. Therefore, the correct option is option C among all the given options.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it can be a push or perhaps a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force (formerly P).
The net force exerted on an object approximately equal to the rate where its momentum varies over time, according to Newton's second law in its original formulation. Both devices would require the same amount of force.
Therefore, the correct option is option C among all the given options.
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Final answer:
Without specific sizes of the wheel and axle radii, it's not possible to determine which wheel and axle would require less force to drag a load; hence, the answer is 'Not enough information'.(Option D)
Explanation:
The student asked which wheel and axle would allow a load of rocks to be dragged with less force. To answer this question, it's important to understand that a wheel and axle is a form of lever that can rotate around the center of the axle. The mechanical advantage of such a device is calculated by dividing the radius of the wheel by the radius of the axle.
Without specific measurements of the wheel and axle radii provided for Option A and B, it is not possible to determine which wheel and axle configuration would require less force to drag a load of rocks. Thus, the correct answer to the question would be D. Not enough information.
Definition: This is a solution that will hold no more solute
Answer:
Supersaturated Solution (im not sure what your question was but if you're looking for the term of the definition then it should be supersaturated solution)
Explanation:
Which of the following explains the process of radiation? Question 3 options: when heat gets transferred through objects that are touching when the measurement of heat in the atmosphere goes down when heat gets transferred through electromagnetic waves that move through space when heat gets transferred through a liquid or a gas
Answer:
the answer is when heat gets transfered through objects that are touching when the measurement of heat in the yeans
Explanation:
The Option that explains the process of radiation is : ( C ) when heat gets transferred through electromagnetic waves that move through space
Radiation is the transfer of energy through space in the form of electromagnetic waves or as subatomic particles. Energies transferred during radiation move at the speed of light.
During conduction and convection heat gets transferred through objects that touch each other while during radiation the objects do not have to be in contact for energy to be transferred.
Hence we can conclude that The Option that explains the process of radiation is when heat gets transferred through electromagnetic waves that move through space
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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.
ANSWER ASAP PLEASE
Which phenomenon occurs when a wave encounters a non–transmitting barrier?
A.
refraction of the wave with a different wave speed
B.
reflection of the wave with a different wavelength
C.
reflection of the wave with the same wave speed
D.
refraction of the wave with a different wavelength
Answer:
C. reflection of the wave with the same wave speed
Explain why sound energy is not a type of potential energy.
A. It does not depend on the position or configuration of the system.
B. It does not depend on the mass of the system.
C. It does not depend on the age of the system.
D. It does not depend on the temperature of the system.
Answer:
A
Explanation:
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!
___________is the rate at which electric charges move through a conductor. *
voltage
current
resistance
amps
Answer:
VoltageExplanation:
A conductor's voltage determines how fast electric charges pass through it. In a circuit, electrons move around due to voltage. If there is no voltage, electrons can move in any direction.
Voltage is the correct answer.
I hope this helps you! Please let me know if my answer is wrong.
You poll students on whether they prefer hotdogs, chicken fingers, salad, or
spaghetti for lunch. Which graph would you use to show your results?
A. Bar graph
B. Line graph
C. Cumulative frequency graph
D. Histogram
SO
Answer:
A. Bar Graph
Explanation:
It is easier to see the data.
We would use A)Bar graph to show our results.
What is a bar graph?A bar graph can be described as a chart or a graphical representation of data, portions, or numbers the usage of bars or strips. Bar graphs are used to compare and evaluate numbers, frequencies, or different measures of wonderful categories of statistics.
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It is important to wear protective equipment in both practice and games.
Please select the best answer from the choices provided.
OT
OF
Answer:
OT
It is important to wear protective equipments during games and practices.
Explanation:
Practice is a review of what is about to happen in some time to come and with practice ,the future can be trusted.
During practice it is very important to use protective gears or equipments because without them, injuries and accidents are liable to occur.
During the major game it is also important to prevent accidents or big injuries as the equipments protect each vital part of the body.
Answer:
The answer is True
Explanation:
Hope this helps you
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:
Which image illustrates the bending of a wave around the edge of an
obstacle?
Answer: C
Explanation:
This was a project I had to do. What do you think of it?
Answer:
looks nice, it must of taken months of practice! Great job!
A 70.0-kilogram man is walking at a speed of 2.0 m/s. What is his kinetic energy?
KE : 1/2mv^2
KE: 1/2 x 70(2^2)
KE: 1/2 x 70 x 4
= 1/2 x 280
280 x 1/2 = 140
Therefore, the man's kinetic energy is 140J.
What would be a clean energy replacement for the dam’s hydroelectric power?
Answer:
solar panels
Explanation:
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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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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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.
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.....
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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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
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.
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 .
What must a magnet always have?
O A. Two like charges
OB. Two opposite poles
O c. Two opposite charges
OD. Two like poles
Answer:
two opposite poles
Explanation:
What is the resistance force when you walk up an inclined plane?
Answer:
the resistance force is mg cos(-)
Explanation:
The resistance force on an inclined plane is generated by a portion of the object's weight acting downward along the plane and the counteracting frictional force. It opposes your upward movement. The total force exerted walking up an incline is less than lifting the same weight vertically, which explains why it's easier to walk uphill than climb a ladder of the same height.
Explanation:When you walk up an inclined plane, you encounter two forces due to gravity: a force acting perpendicular to the plane and a force acting parallel to the plane. The perpendicular force is typically equal in magnitude and opposite in direction to the normal force. The force acting parallel to the plane leads the object to accelerate down the incline. This is the resistance force you experience when moving up. It's composed of a part of the weight (W) inclined downward along the plane and the opposing frictional force (f). Specifically, if the incline is at an angle Θ, the resistance force, W_parallel, can be expressed as W_parallel = mg sin(Θ), where m is mass and g is the force of gravity, and the kinetic friction, f_k, can be expressed as: f_k = μ_k mg cos(Θ).
However, when walking, you work against the resistance to move forward, and hence, the net force is not zero. As a result, climbing an inclined plane is less strenuous than climbing directly upwards, though it demands work over a greater distance.
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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
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.