Answer:
D
Explanation:
Look at the diagram showing the different wavelengths in sunlight. A diagram showing the human eye and visible light. Visible light is broken down by color with wavelength in nanometers. Red is 700, orange is 600, yellow is 580, green is 550, blue is 475, indigo is 450, violet is 400.
the only answer that makes sense is D
If a scientist wants to figure out how old a rock layer is, would it be useful to use a substance that takes a long time to break down (has a long half life), or a substance that breaks down quickly?
A.A substance that breaks down slowly, because then there won't be enough left to measure
B.A substance that breaks down slowly, because then there will be enough left to measure.
C.A substance that breaks down quickly, so it will be all gone and we'll know it's old
Answer:
B.
Explanation:
This is because if it has a long half-life then there will be enough rock left to be able to determine the age of the rock. It is not A. because if it has a long half-life there would be part of the substance left to determine the age. It is not C. because in order to study the substance, there must first be a substance left to study.
Hope this helps!
If a star is measured to have a parallax angle of 0.5 arcsec, how far away is the star? a. 2 ly b. 2 pc c. 0.5 pc (astronomy)
Answer:
2 pc
Explanation:
The parallax angle is the angle of the earth at different times in a year relative to a given closest star.
P = [tex]\frac{1}{d}[/tex]
where p is the parallax angle, d is the distance between the earth and the star
Since p = 0.5 arcsec, then;
d = [tex]\frac{1}{p}[/tex]
= [tex]\frac{1}{0.5}[/tex]
= 2
d = 2 pc
The star is 2 parsec away from the earth.
Which series of energy transformations takes place in the circuit when the siren turns on? A: Chemical energy > Sound energy > Electrical energy B: Sound energy > Electrical energy > Chemical energy C: Chemical energy > Electrical energy > Sound energy D: Electrical energy > Chemical energy > Sound energy
Answer: The correct option is C ( Chemical energy > Electrical energy > Sound energy)
Explanation:
Energy is defined as the capability or ability to perform work. It is measured in joules. It is a scalar quantity ( that is, fully described by its magnitude).
The principle of conservation of energy states that in a closed system, energy can neither be created nor destroyed during transformation. Although energy can be transformed so that the total energy of a given system always remains constant. The different forms of energy includes:
--> mechanical energy
--> Chemical energy
--> Heat energy
--> sound energy
--> electrical energy
--> sound energy
To be able to create a circuit that will produce siren sounds, a source of power supply will be needed. This would be derived from a battery cell( Chemical energy). This supplies current (electrical energy)to the sound system of the circuit to produce the siren sounds heard(sound energy). Therefore the energy transformation is from CHEMICAL ENERGY to ELECTRICAL ENERGY to SOUND ENERGY.
Which equation describes the sum of the vectors plotted below?
Answer:
Answer: A. [tex]\vec r = 4\hat x+2\hat y[/tex]
Explanation:
Sum of Vectors
The vectors plotted in the graph are arranged using the head-to-tail method, i.e. placing the tail of the second vector at the head of the first vector. The head of the second vector indicates the sum of both vectors.
From the graph, we can see the head of the second vector lies in the point of coordinates (4,2).
This vector is represented as:
[tex]\vec r = 4\hat x+2\hat y[/tex]
Answer: A. [tex]\mathbf{\vec r = 4\hat x+2\hat y}[/tex]
Supposed there is no electrical current in a coil of wire that contains a permanent magnet. Which statement must be true?
A. The coil and the magnet are of different lengths
B. The coil and the magnet are the same length
C. The coil and the magnet are not moving relative to each other
D. The coil and the magnet are moving relative to each other
Answer:
c
Explanation:
a pex
When a coil of wire is stationary and there is no relative motion between the coil and a permanent magnet, there will be no induced electrical current in the coil. The correct statement in this scenario would be C. The coil and the magnet are not moving relative to each other.
Electromagnetic induction states that a change in magnetic field through a conductor (in this case, the coil of wire) will induce an electromotive force (EMF) or voltage across the ends of the conductor. This induced voltage can then drive an electric current to flow if there is a complete circuit.
When there is no electrical current flowing through a coil of wire that contains a permanent magnet, the interaction between the magnetic field of the magnet and the coil's magnetic field depends on their relative motion. In this case, if there is no movement between the coil and the magnet, the magnetic fields are not changing with respect to each other. Therefore, the absence of relative motion between the coil and the magnet is the condition in which no electrical current is induced in the coil.
Therefore, the correct statement in this scenario would be C. The coil and the magnet are not moving relative to each other.
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?
As you age, what naturally happens to your body's
flexibility?
It decreases.
o It changes in predictable cycles.
0 It increases.
It stays the same.
Answer:
It decreases
Explanation:
i hope that helps
Answer:
Doesn't out flexibility decrease
Explanation:
What is the purpose of life?
Answer:
to live honorable
Explanation:
If you are driving forward and suddenly break, what would happen to your body and which law does that demonstrate?
A. Move forward, 1st Law
B. Go back, 2nd Law
C. Go back, 1st Law
D. Move forward, 2nd Law
Answer:
1st law you would move forward if you were sitting right with a seatbelt
If you are driving forward and suddenly break due to inertia your body moves forward demonstrating newton's first law of motion. Therefore, option (A) is correct.
What Is Newton’s First Law of Motion?Newton’s 1st law of motion can be defined as the object will stay in the state of rest or uniform motion in a straight line until and unless an external force acts on it.
Once the body starts to move, it won't stop or change its speed until and unless some external force applies upon it one or more times. Newton's 1st law of motion is also known as law of inertia.
There are two conditions for Newton's first law of motion. If an object is at rest, velocity (v) and acceleration (a) are equal to zero. Therefore, the object will continue to be at rest state.
When a body is already in motion, velocity will be non-zero (v ≠ 0), while acceleration (a = 0) is equal to zero. Therefore, the body will continue to be in motion with the same speed and in the same direction.
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4. In a closed system consisting of a cannon and a cannonball, the kinetic energy of a cannon is 72,000 J. If the cannonball is 18 kg it has a velocity of 23 m/s when fired from the cannon, what is the total kinetic energy in the system?
A. 72, 207 J
B. 71, 793 J
C. 67, 239 J
D. 76, 761 J
5. In a computational model of the energy loss of a house, if the energy flux increases and the total area insulated increases, what happens to the energy loss of the house?
A. The energy loss must decrease.
B. The energy loss must increase.
C. The energy loss can increase or decrease.
D. The energy loss will neither increase nor decrease.
Answer:
1. The velocity decreases, and the kinetic energy decreases.
2. an increase in temperature difference between the inside and outside of the building
3. The total kinetic energy remains the same.
4. 76,761 J
5. The energy loss must increase.
Explanation:
Send your thanks to sonographer not me, i just wanted him/her to get the thanks they deserve. #PHYSICSSUCKS
kinetic energy and thermal conductivity processes allow the correct answers to the questions are:
4. The answer for the total kinetic energy correct is: D. 17761 J
5. the answer is: C. The energy loss can increase or decrease.
4. Kinetic energy is due to the motion of bodies and is given by the relation
K = ½ m v²
Wher k is de kinetic energy, m the mass and v speed.
Let's look for the kinetic energy of the bullet
K₂ = ½ 18 23²
K₂ = 4761 J
They indicate the kinetic energy of the cannon is K = 72000 J, they ask the energy at total kinetic energy is
[tex]K_{total}[/tex] = K + K₂
K_{total} = 72000 + 4761
K_{total} = 76761 J
When checking the answer, the correct one is
D. 76761 J
5. In modern houses and systems, insulation is created to maintain heat and reduce losses
P =[tex]\frac{A \Delta T}{R}[/tex]
Where P is the heat flux, A the insulated area, ΔT the temperature difference and R the relationship between the thickness of the insulation and its thermal conductivity.
In this case they indicate that the flow increases and the isolated area increases. We have several possibilities
The flow increases faster than the isolated area in this case the heat loss increases The heat flow increases by the same amount as the isolated area, for this the amount of insulation must increase (R), the losses will remain constant. The heat flow increases slower than the insulated area, the losses will decrease.
In this case it indicates that the two increases, therefore the heat requests can increase or decrease
The correct answer is :
C. The energy loss can increase or decrease.
With kinetic energy and thermal conductivity processes we can find the correct answers to the questions that are:
4. The answer for the total kinetic energy correct is: D. 17761 J
5. the answer is: C. The energy loss can increase or decrease.
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You place a box weighing 268.3 N on an inclined plane that makes a 42◦ angle with the horizontal.
Compute the component of the gravitational force acting down the inclined plane.
Answer in units of N.
Answer:
Wy = - 268.3*cos(42) = - 199.38 [N]
Wx = 268.3*sin(42) = 179.52 [N]
Explanation:
To solve this problem we must make a free body diagram, in the attached image we can see a free body diagram.
Taking the inclined X & y axes with the same angle of 42°, we can see that the weight can be decomposed on both axes.
Since the angle is adjacent to the y-axis, we can use the cosine function
Wy = - 268.3*cos(42) = - 199.38 [N]
Wx = 268.3*sin(42) = 179.52 [N]
PLS HELP ME I'LL GIVE BRAINLIEST
A bug crashes into a high-speed bus. The force experienced by the bug is equal to (less than, equal to, greater than) the force experienced by the bus. The resulting acceleration of the bug is ____________ (less than, equal to, greater than) the resulting acceleration of the bus.
Answer:
equal to
i hope this helps
how do i get a girl to like me
Answer:
FIRST OF ALL get to know her, and DON'T STARE AT HER ALL THE TIME! And then you just let her know that you like her!
Explanation: HOPE THIS HELPS!
What are the characteristics of continental tropical air masses?
They have cool, dry air.
They have warm, dry air.
They have cool, moist air.
They have warm, moist air.
Answer:
I think its B bc I took the test and got D wrong
Explanation:
:)
the characteristics of continental tropical air masses They have warm, dry air. Hence option B is correct.
What is tropical air ?Tropical Air is a Tanzanian airline operating in Zanzibar. It was the first locally owned airline in Zanzibar, starting operations in 1999 with a single aircraft. Captain Omar Haji established it. It works in Pemba, Dar es Salaam, and other areas in Tanzania. They are no longer in use.
Throughout the year, the maritime Tropical (mT) air mass is the most important moisture-bearing and rain-producing air mass. It goes poleward in the winter and is cooled by the ground surface. As a result, it is distinguished by fog or low stratus or stratocumulus clouds, rain, and limited visibility.
Meteorology (the study and forecasting of weather), climatology (the study of long-term atmospheric patterns and their impacts), and aeronomy are the three classic thematic areas of the atmospheric sciences.
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types of energy i really need this answer
Answer:
These are the two basic forms of energy. The different types of energy include thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.
Explanation:
An object of mass 10 kg is in a circular orbit of radius 10 m at a
velocity of 10 m/s. Calculate the centripetal force (in N) required
to maintain this orbit.
We have that for the Question "Calculate the centripetal force (in N) required to maintain this orbit." it can be said that the centripetal force (in N) required to maintain this orbit is
F=62.5N
From the question we are told
An object of mass 10 kg is in a circular orbit of radius 10 m at a
velocity of 10 m/s.
Calculate the centripetal force (in N) required to maintain this orbit.
Generally the equation for the Centripetal force is mathematically given as
[tex]F=\frac{mv^2}{r}\\\\F=\frac{5*10^2}{8}[/tex]
F=62.5N
Therefore
the centripetal force (in N) required to maintain this orbit is
F=62.5N
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2. Unlike friction, gravity
a. is a force.
b. acts over a distance.
c. acts between objects that are not touching.
d. two of the above
Unlike friction, gravity is a force and acts between objects that are not touching. The correct option is d.
What is gravity?Gravity is the force by which an object attracts another object toward its center.
Gravity is also known as the gravitation force that acts between the two objects kept a distant apart.
Thus, option d is correct.
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Question 14 of 25
The image shows devices that convert wind energy into electrical energy.
What is one advantage of using this type of device in place of burning fossil
fuels?
Answer:
Explanation:
B
Answer: B.It uses a renewable resources
Explanation:
can someone please answer and explain?
its the first one i had the same answer for a test and i got it right
An 8-N force is applied to a 2-kg box to accelerate it to the right across a table. The box
encounters a force of friction of 5 N. What is the acceleration of the object?
(1 Point)
4 m/s2
2.5 m/s2
1.5 m/s2
1 m/s2
Answer:
1.5
Explanation:
resultant force=8-5=3N
using f=ma
a=f/m
=3/2
=1.5
Matter can undergo chemical reactions and nuclear reactions. Which property is conserved in nuclear reactions?
Answer:
Explanation:
In a chemical reaction, table sugar (sucrose) is mixed with sulfuric acid. The result of the reaction is a towering black structure of elemental carbon, water vapor, carbon dioxide, and sulfur dioxide gases.
Answer: total mass number
Explanation:
SOMEONE PLZ HELP , I HAVE 4 HW DUE TMR BC MY TEACHER JUST GIVE ME A VERY SHORT TIME TO DO THE WORK . 50POINTS
Answer:
4. Violet light has the shortest wavelength of all the colours and the highest frequency. Red has the longest wavelength and the lowest frequency.
5.
a. Radio waves
b. Radio waves
c. Radio waves
d. Radio waves
e. Infrared waves
f. Infrared waves
g. Infrared waves
h. X-ray waves
i. Gamma ray waves (UV)
6. Ultraviolet (UV) radiation
7. Premature aging of the skin and sun damage
(liver spots, keratosis, solar elastosis, etc.)
Hope it helps!
d. Radio waves
e. Infrared waves
g. Infrared waves
h. X-ray waves
i. Gamma ray waves (UV)
6. Ultraviolet (UV) radiation
.org
A string is tied with a 0.500 kg object and swung around a
person's head in a horizontal circle. The length of the string is
1.00 m. The maximum speed the object can be swung without
breaking the string is 7.07 m/s. What is the force the string can
withstand without breaking?
Answer: 25 N
Explanation:
Answer:
7.07 m/s
Explanation:
If your on ck12 like me this might be one of your answer choices, just got it correct so im sharing.
1. James drives 400 km in 5 hours to his grandmothers. What are the units for speed going to be?
2. James drives 400 km in 5 hours to his grandmothers. What is the distance he will travel?
3. James drives 400 km in 5 hours to his grandmothers. What is the time it takes to get there?
Answer:
See the answer below
Explanation:
1. Speed is calculated as the ratio of distance and time. Hence, Jame's speed can be calculated as:
400/5 km/hr = 80 km/hr
The unit for the speed would be km/hr. This can also be converted to m/s:
80 km = 80,000 m
1 hr = 3,600 s
80 km/hr = 80,000/3600 m/s = 22.22 m/s
2. Since James drove 400 km in 5 hours, the distance he drove is 400 km.
3. The time it took for James to get there is 5 hours.
i need to speak with zuka
Answer:
DMs are not accessible anymore. I assume Zuka is a staff member? the only way to talk to a staff member anymore is to report something, but even then, the probably won't even look at what they're deleting :/
May I have brainliest please? :)
if the density of wood is 0.5g/cm3 what is the mass of 1cm3
Answer:
O. 5 g
Explanation:
It literally says for every cm3 its 0.5 g
Which of the following best defines a nonrenewable resource?
A resource that cannot be replenished
A resource that is difficult to recover
A resource that is replenished at a rate slower than it is used
Any resource that exists in finite quantities (there is only a certain amount)
Answer:
I think it's this A resource that is replenished at a rate slower than it is used
Any resource that exists in finite quantities (there is only a certain amount)
Answer:
A resource that is difficult to recover.
Suppose an object's acceleration is negative. Use the formula for
acceleration to explain what this implies about the initial and
final velocities.
Explanation:
Vi>Vf
so the initial is greater than from the final
hope it helps u have a great day
Una cuerda horizontal puede transmitir una potencia máxima P (sin romperse) si por ella viaja una onda con amplitud A y frecuencia angular W. Para aumentar esta potencia máxima, un estudiante dobla la cuerda y usa esta "cuerda doble" como medio. Determine la potencia máxima que se puede transmitir a lo largo de la "cuerda doble", si supone que la tensión en las dos hebras juntas es la misma que la tensión original en la cuerda individual.
Answer:
P´ = 11.3 P
power increases 11.3 times
Explanation:
For this exercise let's use the equation for power transmitted on a string
P = ½ μ w² A² v
when we bend the rope the area and density change
A´ = 2 A
μ'= 2m / l
μ'= 2 μ
the speed of the rope is
v² = T /μ
indicate that the tension in the two strands is the same
v´² = T / μ´
v´² = T / 2μ
v´ = √ ½ v
we substitute in the power
P´ = ½ μ´ w² A´² v´
P´ = ½ 2μ w² 4A v/√2
P´ = 8/√2 P
P´ = 11.3 P
power increases 11.3 times
Motor of 1 HP has 66% efficiency it can lift some water at 10 metre height in 2 seconds what is the mass of the water
Answer:gand maraoo
Explanation:put your hand on your assignment
in which state of matter are the particles closest together?
Answer: The particles of a solid are [generally] closest together while those of a gas are farthest apart
Explanation: