Answer
Energy
Explanation
wave is a disturbance which travels through a medium carrying energy from one point to another without causing any permanent displacement in that medium. So energy is carried by a wave.
Which of the following statements about lipids and carbohydrates is true?
Answer : Lipids and carbohydrates are both made from carbon, hydrogen, and oxygen, but lipids have less oxygen (Option B)
Carbohydrates are biomolecules composed of carbon (C), hydrogen (H), and oxygen (O) in a 1:2:1 ratio, respectively.
Carbohydrates can be divided regarding the number of monomers in the biomolecule into monosaccharides, disaccharides, and polysaccharides.
Explanation:
hope this answer will helps you !
two windmills stand on a field 456 feet apart. a cow is in the field, 320 feet from one windmill and 210 feet from the other. what is the measure of theta?
The cosine rule is used to determine the values of unknown aides and angles in a triangle
The measure of θ is approximately 117.2°
Reason:
Given parameters are;
The distance between the two windmills, a = 456 feet
The distance between the cow and one of the windmills, b = 320 feet
Distance between the cow and the other windmills, c = 210 feet
Required, the angle θ between b, and c direction
Solution;
By cosine rule, we have;
a² = b² + c² - 2·b·c·cos(θ)
\(cos (\theta) = \dfrac{b^2 + c^2 - a^2}{2 \cdot b \cdot c }\)Which gives;
\(cos (\theta) = \dfrac{320^2 + 210^2 - 456^2}{2 \times 320 \times 210 }\)
\(\theta = arcos \left(\dfrac{320^2 + 210^2 - 456^2}{2 \times 320 \times 210 }\right) \approx 117.2 ^{\circ}\)The measure of θ ≈ 117.2°
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Matter is defined as anything that has weight and takes up space.
Answer:
true matter takes up space and is anything that is around us
How much heat does it take to raise 0.0438 kg of aluminum from room temperature (20.0°C) to its melting point (660°C)?
HELP
Answer:
2.5x10^4 J (scientific notation)
25,000 (Acellus)
Equation:
Q=mcΔT
where:
Q=heat
m = mass
c = specific heat
ΔT=change in temperature
Any rearranging?
Let's see.
No, we need heat.
So no rearranging.
Plug in the numbers and solve
It takes approximately 28,224 joules of heat to raise 0.0438 kg of aluminum from room temperature to its melting point.
To calculate the heat required to raise the temperature of aluminum from room temperature to its melting point, we need to use the specific heat capacity formula: Q = m × c × ΔT
where:
Q = heat (in joules)
m = mass of aluminum (in kilograms)
c = specific heat capacity of aluminum (in joules per kilogram per degree Celsius)
ΔT = change in temperature (in degrees Celsius)
Given:
Mass of aluminum (m) = 0.0438 kg
Specific heat capacity of aluminum (c) = 900 J/kg°C (approximate value for aluminum)
Change in temperature (ΔT) = melting point (660°C) - room temperature (20°C) = 640°C
Now, let's calculate the heat (Q):
Q = 0.0438 kg × 900 J/kg°C × 640°C
Q = 28,224 J (joules)
So, it takes approximately 28,224 joules of heat to raise 0.0438 kg of aluminum from room temperature to its melting point.
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2. List two units for measuring mass and two units for measuring force.
Answer:
Gram (g) and Kilogram (kg) are used to measure mass.
Metre (m) and Kilogram (kg) are used to measure force.
The two units for measuring mass and two units for measuring force are kilogram and gram and Newton and pound respectively.
The kilogramme (kg), the standard unit of mass in the International System of Units (SI), is frequently used in both ordinary and scientific mass measurements.
Gramme (g): Because it is a more compact unit of mass, the gramme is frequently employed for smaller and more exact measurements. It is the same as one thousandth of a kilogramme.
Newton: The SI unit of force is the newton. A kilogramme of mass is defined as the force needed to accelerate it by one metre per second squared.
lb (pound): In non-SI systems, particularly in the US, the pound is a widely used unit of force. It is explained as the amount of force needed to move a one-pound mass one square foot per second.
Thus, the units are kilogram and gram for mass and Newton and pound for force.
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two small spheres, each with a mass of 3.0 kg, are placed 6.0 m apart. which of the following is the order of magnitude of the gravitational attraction between them?
Order of magnitude of gravitational force between two 3.0 kg spheres placed 6.0 m apart is approximately \(10^{-11} N\).
What is the order of magnitude of gravitational force between two 3.0 kg spheres placed 6.0 m apart?
The formula for gravitational force between two masses is:
F =
\(G * (m1 * m2) / r^2\)
Where:
G - Gravitational constant (\(6.67 x 10^{-11} N*m^{2}/kg^2\))
m1, m2 - Masses of 2 objects
r - Distance bet. the centers of 2 objects
Putting values given, we will get:
\(F = (6.67 x 10^{-11}) * (3.0 kg)^2 / (6.0 m)^2\)
Simplifying this expression, we get:
\(F = 5.55 x 10^-11 N\)
Therefore, the order of magnitude of the gravitational attraction between the two spheres is approximately 10^-11 N.
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Why is it important that a finger be wet
before it is touched to a hot clothes iron?
Why is it important that your finger be wet if you intend to touch it briefly to a hot clothes iron to test its temperature. If your finger is wet, some of the heat transmitted to your finger will be given to the water which has a high specific heat capacity and also a larger latent heat of vaporization.
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five adaptive features of guava fruite
Guava fruit exhibits several adaptive features that contribute to its survival and reproduction in its environment. Here are five adaptive features of guava fruit:
1)Hard, protective outer layer
2)High vitamin C content
3)Numerous seeds
4)Aromatic scent
5)Tolerance to varied environmental conditions
Hard, protective outer layer: The outer layer of guava fruit is tough and thick, providing protection against physical damage and potential threats from herbivores and pathogens.
High vitamin C content: Guava fruit has a high concentration of vitamin C, which acts as an antioxidant. This feature helps the fruit endure exposure to sunlight and prevents oxidative damage caused by free radicals.
Numerous seeds: Guava fruit typically contains numerous small seeds. This adaptive feature increases the chances of successful reproduction, as more seeds are available for dispersal and potential germination.
Aromatic scent: Guava fruit emits a pleasant and distinct aroma. This scent attracts animals, especially birds and insects, which can aid in seed dispersal by consuming the fruit and subsequently dispersing the seeds through their droppings.
Tolerance to varied environmental conditions: Guava fruit is resilient and can tolerate a range of environmental conditions, including high temperatures, drought, and acidic soils. This adaptability enables guava plants to thrive in diverse habitats and ensures the survival of the fruit in different climates and ecosystems.
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Metals allow electrons to flow through and complete the circuit. Therefore they are called?
Answer:
the answer would be conductors
A stone is dropped from the edge of a roof, and hits the ground with a velocity of -120 feet per second. How high (in feet) is the roof?
The Height of the roof is 225 feet .
Calculation :
y = h - gt2/2 = 0;
h = gt2/2;
v(t) = dy/dt = - gt;
t = - v(t)/g;
h = g/2·v2(t)/g2
= v2(t)/(2g)
= 120²ft2/s²/(2·32ft/s²) =
225 ft
In mathematics, height is defined as the vertical distance from top to bottom of an object. Also called "height". The term geometry height refers to the measurement of an object along the coordinate geometry's y-axis.
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Who did come up with the theory of light proposing the fact that your eyes don't send out invisible, intelligence-gathering probes, they simply collect the light that falls into them?
The theory that explains how our eyes collect light instead of emitting invisible intelligence-gathering probes was proposed by Alhazen, also known as Ibn al-Haytham, an Arab scientist during the Islamic Golden Age.
The theory in question was put forward by Alhazen, an influential Arab scientist who lived during the 10th and 11th centuries. Alhazen, also known as Ibn al-Haytham, made significant contributions to the understanding of optics and vision.
One of Alhazen's major works, "Kitab al-Manazir" (The Book of Optics), presented his theories on vision and light. In this book, he argued against the prevailing belief that the eyes emitted invisible rays to perceive objects. Instead, Alhazen proposed that vision occurs when light reflects off objects and enters the eyes, where it is then collected by the visual system.
Alhazen's work challenged the previous theories of vision put forth by ancient Greek philosophers, such as Euclid and Ptolemy. His emphasis on empirical observations and experimental methods marked a significant shift in scientific thinking.
Alhazen's theory of vision, which highlighted the passive nature of the eyes in collecting light rather than emitting rays, laid the foundation for our modern understanding of how light interacts with the visual system and how we perceive the world around us.
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A standing wave has a frequency of 471 Hz and a wavelength of 1.9. What is the speed of the
wave? (Round to the 2nd number after the decimal)
1
I REALLY NEED HELP !
Answer:
c = 894.90 m/s
Explanation:
Given data:
Frequency of wave = 471 Hz
Wavelength of wave = 1.9 m
Speed of wave = ?
Solution:
Formula:
Speed of wave = frequency × wavelength
c = f×λ
c = 471 Hz × 1.9 m
Hz = s⁻¹
c = 471s⁻¹ × 1.9 m
c = 894.90 m/s
The speed of wave is 894.90 m/s.
43
Select the correct answer.
According to the law of reflection, what is the relationship between the angle of incidence and the angle of reflection?
OA. The angle of reflection is twice the angle of incidence.
OB.
The angle of reflection is half the angle of incidence.
OC. The angle of reflection is equal to the angle of incidence.
OD. The angle of reflection is independent of the angle of incidence.
ОЕ.
The angle of reflection is always perpendicular to the angle of reflection.
Reset
Next
Answer is c, they are equal:
Explanation:
Daylon's family just bought a new puppy, and Daylon decided to take him for a walk. He put the puppy in a wagon and pulled the wagon along the sidewalk. From which of these reference points does the puppy appear to be moving? 1. Daylon 2. The wagon 3. The sidewalk 4. The puppy's collar
The puppy was not moving relative to Daylon, the wagon, or his collar.
He was moving relative to a point on the sidewalk.
Note that the puppy did NOT get his walk.
Which of the following best defines energy?
the ability to do work
the resistance to motion
how fast an object moves
amount of force in a given time
Answer:
The Ability to do work
Explanation:
energy is needed to do work because without energy no work can be done due to the fact that there is no energy
A light beam travels at 1.34×10^8m/s indiamond. The wavelength of the light indiamond is 246 nm.(a)What is the index of refraction of diamondat this wavelength?(b) If this same light travels through air, whatis its wavelength there?(c) If the light ray hits the surface of the diamond at the angle of 15° with thenormal, at which angle will it be refracted into air?
For the light beam
a) The index of refraction is 2.24.
b) The wavelength of the same light in air is 551.04 nm.
c) the angle is 17.14°.
Finda) The index of refractionb) The wavelengthc) The angle of refraction(a) The refraction index of the diamond at this wavelength can be found using the formula n=c/v, where c is the speed of light in a vacuum and v is the speed of light in a diamond.
n = c/v = 3.00 x 10^8 m/s / 1.34 x 10^8 m/s = 2.24
Therefore, the index of refraction of the diamond at this wavelength is 2.24.
(b) When light travels through air, its wavelength changes due to the change in the medium, but its frequency remains the same. The relationship between the speed, frequency, and wavelength of light is given by the formula c = λf, where c is the speed of light, λ is the wavelength, and f is the frequency.
We can rearrange this formula to solve for the new wavelength:
λ_air = c/f = (c/v) λ_diamond = n λ_diamond
where n is the index of refraction of a diamond. Substituting the values given,
λ_air = 2.24 x 246 nm = 551.04 nm
Therefore, the wavelength of the same light in air is 551.04 nm.
(c) According to Snell's law, n1 sinθ1 = n2 sinθ2, where n1 and n2 are the indices of refraction of the initial and final mediums, and θ1 and θ2 are the angles of incidence and refraction, respectively, with respect to the normal.
We can rearrange this formula to solve for θ2:
sinθ2 = (n1 / n2) sinθ1
Substituting the values given, we get:
sinθ2 = (1 / 2.24) sin 15°
θ2 = sin⁻¹(0.295) = 17.14°
Therefore, the angle at which the light ray will be refracted into the air is 17.14°.
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Which of the following types of ES is frequently used to support operational procurement activities? A) ERP B) SCM C) SRM D) Two of the above,
Among the following options, Enterprise Resource Planning (ERP) is the type of ES frequently used to support operational procurement activities.
What is ERP?ERP or Enterprise Resource Planning is a software application that an organization uses to manage its business processes. It integrates various departments, such as finance, HR, inventory, and procurement, into a single system and streamlines communication between them. This assists firms in effectively utilizing resources and achieving their objectives.
ERP system is frequently used to support operational procurement activities because it can help in coordinating the purchasing process from start to finish. It also automates many activities such as generating purchase orders, tracking shipments, recording receipts, and paying invoices.
Thus, it can increase the efficiency and accuracy of procurement processes, reducing the need for manual intervention.
Therefore, the correct answer is A) ERP.
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need help asap, thank you !
In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at which of the following angles? O 38 O 57⁰ 0:45. 07
A projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰. The correct option is (B) 57⁰.
In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at an angle of 57⁰.
The range of a projectile can be determined by using the range formula.
R = ((v^2 * sin(2θ))/g) Where
R is the range of the projectile,
v is the velocity of the projectile,
θ is the angle at which the projectile is launched, and
g is the acceleration due to gravity.
In the absence of air resistance,
the horizontal component of velocity of a projectile remains constant throughout the flight.
So, the range of a projectile depends only on its initial velocity and the angle at which it is launched.
If a projectile is launched at an angle θ,
the time of flight of the projectile can be calculated by using the following formula:
T = (2v * sin(θ))/g
The maximum height reached by the projectile is given by the formula:
H = (v^2 * sin^2(θ))/2gIf a projectile is launched at an angle θ, then the range of the projectile will be the same as the range of the projectile launched at an angle of (90 - θ).
So, if a projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰.
Therefore, the correct option is (B) 57⁰.
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like a galvanometer an electric motor contains _______ that is free to rotate between the poles of a permanent fixed magnet
Like a galvanometer, an electric motor contains an essential component known as an armature that is free to rotate between the poles of a permanent fixed magnet.
The armature consists of a coil of wire wound around a core made of a ferromagnetic material such as iron. When an electric current passes through the coil, it generates a magnetic field around it, interacting with the fixed magnet's field.
The interaction between the magnetic fields causes a rotational force or torque on the armature, making it rotate. The armature is mounted on an axle or shaft, and this rotational motion is transferred to a mechanical load or system, enabling the motor to perform useful work.
To ensure continuous rotation, the motor employs a commutator, which is a segmented metallic ring connected to the armature coil. Carbon brushes come into contact with the commutator, supplying current to different segments of the coil as it rotates.
This switching of electrical connections ensures that the magnetic forces on the armature continuously change, producing a rotating motion.
Overall, an electric motor utilizes the principles of electromagnetism to convert electrical energy into mechanical energy through the rotational movement of the armature.
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What is the intensity level of a sound with intensity of 5.0 ´ 10-10 W/m2? (I0 = 10-12 W/m2)
The intensity level of a sound with an intensity of 5.0 × 10-10 W/m2 is 27 dB.
The intensity level of a sound can be calculated using the following formula:
Intensity level (dB) = 10 log (I/I0), where I is the intensity of the sound and I0 is the reference intensity, which is typically 10-12 W/m2.
Using this formula, we can calculate the intensity level of a sound with an intensity of 5.0 × 10-10 W/m2 as follows:
Intensity level (dB) = 10 log (5.0 × 10-10 / 10-12)
Intensity level (dB) = 10 log (5.0 × 102)
Intensity level (dB) = 10 × 2.7
Intensity level (dB) = 27 dB
Therefore, the intensity level of a sound with an intensity of 5.0 × 10-10 W/m2 is 27 dB. It's important to note that the intensity level is a measure of how loud a sound is perceived by the human ear, and is typically measured on a logarithmic scale. So, a sound with an intensity level of 27 dB is considered relatively quiet, while a sound with an intensity level of 120 dB (such as a jet engine or a rock concert) is considered very loud and can cause hearing damage if exposure is prolonged.
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An object on the moon feels lighter than the same object on earth. which statement explains this phenomenon?
A. The moon has less mass than earth.
B. The object has a greater gravitational attraction to the moon.
C. The object has less mass on the moon then on earth.
D. The moon is in orbit around earth.
Answer:
B
Explanation:
cause
Answer: A
Explanation:
The moon has less mass than Earth.
Just took the test.
What will be an ideal location for the exhaust fan on your Kitchen wall,
10m or 12m above the floor? Justify your answer.
The ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
What is exhaust fan?Exhaust fan is defined as the device that is used to remove excess moisture, odors, and stale air usually from the kitchen.
When being installed in the kitchen, it should be above the kitchen stove and high enough to be able to remove the steam from the cooking activities.
Therefore, the ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
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What is the acceleration of the cyclist from 175 to 200 seconds? A. -12 m/s2 B. 0m/s2 C. 12 m/s2 D. Can't be determined
Answer:
The correct answer is D
Explanation:
The expression for the accelerated ion is
a =\(\frac{v_f - v_o}{ \Delta t}\)
therefore to find the variation of time is needed, which is a data given in the problem.
It also needs to be emptied of speed, which is not given.
Consequently we cannot find the acceleration in this exercise.
The correct answer is D
Is this spring or winter?
a toy monkey hangs from a hook a certain height above the ground. you fire a projectile at the same instant that the monkey drops and starts falling to the ground. in order to hit the monkey with the projectile, you need to
In order to hit the monkey with the projectile, you need to Aim higher than the monkey's original position.
Projectile motion is the kind of motion in which an object or body is propelled in the air at an angle to the horizontal plane. The motion is caused by gravity and can be seen in many real-world situations. The path of the projectile is referred to as its trajectory.
The given problem is based on projectile motion. A toy monkey hangs from a hook a certain height above the ground. You fire a projectile at the same instant that the monkey drops and starts falling to the ground. In order to hit the monkey with the projectile, you need to aim higher than the monkey's original position. This is because, as the projectile moves toward the ground, it will fall under the influence of gravity. Hence, the projectile needs to be aimed at a higher point than the monkey's initial position.
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I WILL PAYPAL U $15 FOR HELPING. IM SO SERIOUS.
due in 50 minssss
1. Explain how the model of the atom has changed over time.
2. How was the atomic theory able to be changed over time?
3. Does the term indivisible still accurately describe the atom? Explain.
________________________________________
Task# 2: The Structure of Atoms
1. Use the items that your teacher gives you to build a model of an atom. Assign one color to represent each subatomic particle of your atom.
Color Subatomic Particle Charge
2. Draw your model and be sure to label your diagram with the subatomic particle names to show you where you placed them.
3. Since subatomic particles are matter they have mass. Compare the masses of the subatomic particles. Where is the majority of an atom’s mass located?
Answer:
1. The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons. This model was known as the 'plum pudding' model.
This theory was then disproved by Ernest Rutherford and the gold foil experiment in 1911, where Rutherford shot alpha particles at gold foil, and noticed that some went through and some bounced back, implying the existence of a positive nucleus.
In 1913, Niels Bohr proposed a model of the atom where the electrons were contained within quantized shells that orbited the nucleus. This was because it was impossible for the cloud of negative electrons proposed by Rutherford to exist, as the negative electrons would be drawn to the positive nucleus, and the atom would collapse in on itself.
In 1926, the Austrian physicist Erwin Schrödinger created a quantum mechanical model of the atom by combining the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.
However the model used today is closest to the Bohr model of the atom, using the quantized shells to contain the electrons.
2. Joseph Priestly, Antoine Lavoisier, and others set the stage for the foundation of chemistry. They demonstrated that substances could combine to form new materials. It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed an atomic theory in 1803.
3. No because it was believed that the atom was the smallest part that could ever be possible. But with the recent discoveries of large number of subatomic particles, this does not hold true.
Explanation:
Sorry I could only do part 1.
- A thin film of oil * (n = 1.45) on a puddle of water, producing different colors. What is the minimum thickness of a place where the oil creates constructive interference for light with a wavelength equal to 545 nm?
Answer:
There will be a phase change at the first interface and no phase change at the second interface:
If the film is 1/4 wavelength thick this restriction will hold
The wavelength of the light in oil is 545 nm / 1.45 = 376 nm
376 nm / 4 = 94 nm
"D" is correct
Which of these is the part of the cell that contains hereditary material?
interphase
mitosis
chromosome
embryo
At the top of the loop, what is the direction of the force exerted on a 65 kg rider by the seatbelt? a. upwardb. downwardc. this force has no direction, it is (approximately) zero
a. upward. The rider is upside down at the top of the loop, and the seatbelt provides a centripetal force that pulls the rider upward toward the center of the circle, allowing them to follow a circular path.
Centripetal force is a type of force that acts on an object moving in a circular path. It is directed towards the center of the circle and is necessary to keep the thing moving in a circular direction. The centripetal force can be provided by a variety of sources, such as tension in a rope, gravity, or a magnetic field. The magnitude of the centripetal force required depends on the mass of the object, the speed of the thing, and the radius of the circle.
The formula for centripetal force is
F = mv²/r,
where F is the force, m is the mass of the object, v is the velocity of the object, and r is the radius of the circle. Centripetal force is an essential concept in many areas of physics, including mechanics, astrophysics, and engineering, and it plays a significant role in the functioning of many natural and man-made systems, such as planetary orbits, and centrifuges.
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4. A car is accelerating at 40 m/s2, if the car is 400 kg how much force
must be supplied from the engine?*