How are electromagnetic waves and mechanical waves similar and different from each other?.

Answer:

a and b

water has a higher surface tension than veg oil

isopropyl alcohol boils more esier than water

Explanation:

just did the test trust me :)

A and B statement is true about the substances in this experiment.

A. Water has a higher surface tension than vegetable oil.

B. Isopropyl alcohol boils more easily than water.

A substance is a specific type of stuff with specific features. A substance is any pure compound or element. Water is a pure material and a hydrogen-oxygen combination.

A. Water has a higher surface tension than vegetable oil.

Reason:

The force operating at a border between two phases is measured as surface tension. Surface tension at liquid-air interfaces is caused by the higher attraction of liquid molecules to each other than air molecules.

Due to the relatively strong attraction of water. Hence molecules of water have high surface tension.

B.. Isopropyl alcohol boils more easily than water.

Reason:

isopropyl alcohol is a highly flammable liquid that evaporates significantly faster than water, especially when heated. The boiling point of isopropyl alcohol is lower than that of water.

Alcohol is more volatile than water. Hence Isopropyl alcohol boils more easily than water.

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Answer:

direction

size

Explanation:

Vectors are physical quantities with both magnitude or size and direction.

Scalars are physical quantities with only size but not direction.

When describing a vector, on must specify its magnitude and direction.

Only the size of scalar quantities are needed to describe them.

Answer:

Answer in Observational evidence (b)

The evidence needed to formulate a hypothesis is observational evidence. From keen observations, we are formulating a scientific hypothesis.

Hypothesis is a plausible scientific statement which predicts a process or result of an experiment based on observations. Hypothesis can be made from well established scientific records also.

Some are formulating hypothesis based on some intuitions, while some others are formulated based on inductions or  deductions. An experiment starts from a clear cut hypothesis.

A hypothesis must be testable, falsifiable. A scientific hypothesis must be based on a strict observation and for a considerable time and the observations must support for the statement derived for the solution.

Hence, the evidence is needed for a or a hypothesis to be supported or not supported is observational evidence.

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Answer:

The distance is \(d = 79 \ m \)

The displacement is 43 m to the left

Explanation:

Generally the distance is mathematically represented as

\(d = a + b + c \)

substituting 35 meters for b, 18 meters for a and 26 meters for c

So

\(d = 35 + 18 + 26 \)

\(d = 79 \ m \)

In the question we are going to assume the left direction is negative while right direction is positive

Generally the displacement is mathematically represented as

\(D = x + y + z\)

substituting (- 35) meters  for y, (+ 18 )meters for x and  (-26) meters for z

\(D = 18 - 35 -26\)

\(D = - 43\ m\)

So  the displacement is 43 meters to the left

Answer:Describe how scientists study the natural world. Explain ... In this way, scientists gradually build an increasingly accurate and detailed ... Science rests on evidence and logic, so it deals only with things that can be observed. ... This is a drawback, because it may make the observations difficult to interpret.

Explanation:

Answer:

Models

Explanation:

The angular speed of the second hand of a watch is:

w = 0.105 rad/s

We know that the whole watch (a common circle) has a 2*pi rads on its circumference.

Now, there the second hand completes these 2*pi radians in one minute (60 seconds)

The angular speed is equal to the quotient between the angular motion (2pi radians) and the time in which that happens (60 seconds)

Remember that pi = 3.14

Then the angular speed is:

w = (2*3.14 rad)/(60 s) = 0.105 rad/s

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The box travels 3.33 meters up the ramp with no friction and 1.56 meters with friction.

Frictionless ramp:

K_i = (1/2)mv_i^2 = (1/2)(2 kg)(10 m/s)^2 = 100 J

K_f = 0

U_f = mgh

Since energy is conserved, we have:

K_i = U_f

(1/2)mv_i^2 = mgh

h = (1/2)(v_i^2)/g * sin^2(theta) = (1/2)(10 m/s)^2 / (9.81 m/s^2) * sin^2(37 degrees) = 3.33 m

f_friction = μ_k * f_norm

W_friction = f_friction * d = μ_k * f_norm * d

K_i = U_f + W_friction

(1/2)mv_i^2 = mgh + μ_k * f_norm * d

d = (v_i^2 - 2gh)/(2μ_kf_norm) = ((10 m/s)^2 - 2*(9.81 m/s^2)sin(37 degrees)(3.33 m))/(20.22 kg*cos(37 degrees)*9.81 m/s^2) = 1.56 m

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Answer:

She is running 5 yards a second Or 300 yards a minute

Explanation:

Divide 200 by 40 to get the rate of speed in seconds

Answer:

≈ 10.23mph

Explanation:

1760yrds in 1 mile

200yrds to miles is:

200/1760 = .1136miles

3600sec in 1 hr

40sec to hours is:

40/3600 = .011111hrs

Now we find her speed in miles per hour:

.1136mi/.01111hrs ≈ 10.23mph

Answer:

2. Ahead of the package

Explanation:

The plane is going straight without stopping while the package is going straight down.

Answer:

The field is the negative of the slope of the plot of the electric potential.

Explanation:

thanks for question

The Rio Grande is one of the largest river systems in the United States, running over 3,000 kilometers from the mountains of Colorado to the Gulf of Mexico. The river flows from north to south and passes through several states, including Colorado, New Mexico, and Texas.

A comparison of the discharge of the Rio Grande at Albuquerque and at Otowi Bridge (located upstream, near Santa Fe) is as follows: Albuquerque: It is the largest city in New Mexico, situated in the central part of the state. The Rio Grande flows through the city, where it is dammed to form a large lake known as Elephant Butte Reservoir. The discharge of the Rio Grande at Albuquerque is around 100 cubic feet per second (cfs) during normal conditions.

This means that the river has twice the volume of water at Otowi Bridge than at Albuquerque.During times of drought, the river's discharge can drop to dangerously low levels, affecting wildlife and human communities that rely on the river for water. The river's discharge can also increase during periods of heavy rainfall or snowmelt, leading to flooding in downstream communities.

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12.5kg is the mass that would result in critical damping.

The ability of a damper to resist motion is shown by its damping coefficient, which measures the effectiveness of the damper. where c is the damping coefficient and is expressed in newton seconds per meter.

The damping coefficient is a term that has the formula where is a constant. This damping is equivalent to the kind of motion resistance and energy loss experienced when a piston with perforations is moved through a cylinder filled with a viscous fluid, like oil.

Force F = Kx

K = F/x

K = 3/1.5

K = 2N/m.

c² - 4mk = 0

m = c²/4k

m = 10²/4×2

m = 100/8

m = 12.5kg.

12.5kg is the mass that would result in critical damping.
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Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

The property of metal that is most useful for removing wrinkles from clothing using an electric iron is its high thermal conductivity.

The most useful property of the metal used in an electric iron for removing wrinkles from clothing is its high thermal conductivity. Thermal conductivity refers to the ability of a material to conduct heat efficiently. Metals, such as iron, have high thermal conductivity compared to other substances.

When an electric iron is plugged in and turned on, it heats up due to the flow of electric current through a heating element. The metal plate at the base of the iron is designed to quickly and evenly distribute this heat across the fabric, facilitating the removal of wrinkles. The high thermal conductivity of the metal allows the heat to transfer rapidly from the iron to the clothing, effectively relaxing the fibers and smoothing out the wrinkles.

The uniform distribution of heat ensures that the entire surface area of the fabric comes into contact with the hot metal plate, resulting in efficient and effective wrinkle removal. Additionally, the metal plate's smooth surface minimizes the risk of fabric damage or sticking.

In summary, the high thermal conductivity of the metal used in an electric iron enables rapid heat transfer to the fabric, making it the most useful property for effectively removing wrinkles from clothing.

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The mass of all the hydrogen in this star is approximately 4.0661 times the mass of the Sun.

The mass of all the hydrogen in this star can be calculated by multiplying the mass of the star (5.9M sun) by the fraction of the star's mass accounted for by hydrogen gas (68.9%).

The mass of hydrogen in a star is significant as it determines the star's energy production through nuclear fusion. Hydrogen fusion reactions occur in the star's core, releasing immense amounts of energy in the form of light and heat. This energy sustains the star's luminosity and enables it to radiate heat and light into space. Additionally, hydrogen is the primary fuel source for stars, and its abundance directly influences the star's lifespan, size, and overall evolution.

To calculate the mass of hydrogen, we can use the following formula:

Mass of hydrogen = Mass of the star * Fraction of mass accounted for by hydrogen gas

Substituting the given values:

Mass of hydrogen = 5.9M sun * 0.689 = 4.0661M sun

Therefore, the mass of all the hydrogen in this star is approximately 4.0661 times the mass of the Sun.

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While both electromagnetic radiation and visible light have energy, gamma rays have a higher energy level.

The electromagnetic spectrum is defined as the range of frequency of electromagnetic radiation and their respective wavelength. The electromagnetic spectra is following:

Gamma rays =\(10^{-14}\) to \(10^{-12}\)

X-rays = \(10^{-12}\) to \(10^{-10}\)

Ultraviolet rays = \(10^{-10}\) to \(10^{-8}\)

visible light = \(10^{-8} to 10^{-6}\) (380 - 740 nm)

Infrared rays = \(10^{-6} to 10^{-4}\)

Radar = \(10^{-4} to 10^{-2}\)

FM = \(10^{-1} to 1\)

Within the range there are frequency of both visible and gamma radiation.

From the electromagnetic spectra it is seen that the gamma have much shorter wave length than visible light.

and we know that

E = hc/λ

E is directly proportional to 1/λ

So, smaller wave length have more energy. Hence gamma rays have more energy than visible light.

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Answer:

I think it is a parabola.

Answer:

3

Explanation:

wavelength is measure crest-to-crest (or trough-to-trough), so the longest wavelength is #3

Answer: 4 has the highest frequency

Answer:

43.3 m/s.

Explanation:

Assuming the potential energy is due to the gravitational potential energy, we can use the conservation of energy to find the kinetic energy:

Total energy = Potential energy + Kinetic energy

Kinetic energy = Total energy - Potential energy

Kinetic energy = 300 J - 40 J = 260 J

However, we need to know the mass of the object to convert the kinetic energy to velocity. We can use the potential energy to find the mass:

Potential energy = mgh

40 J = m(9.81 m/s^2)(300 m)

m = 0.137 kg

Now we can use the kinetic energy to find the velocity:

Kinetic energy = (1/2)mv^2

260 J = (1/2)(0.137 kg)v^2

v^2 = (2*260 J) / 0.137 kg

v = 43.3 m/s (rounded to one decimal place)

Therefore, the kinetic energy is 260 J and the velocity of the object when it reaches the ground is 43.3 m/s.

Answer:

E=mc△T

E=0.012(4200)(99-98)

E=50.4J

50.4 joules of heat is used

Answer:

At point A;

GPE = 58800 J

KE = 0 J

At point B;

GPE = 44100 J

KE = 14700 J

At point C;

GPE = 0 J

KE = 58800 J

At point D;

GPE = 29400 J

KE = 29400 J

EPE = 29400 J.

Explanation:

The Gravitational Potential Energy, GPE, is given as follows;

GPE = The mass. m × The acceleration due to gravity, g × The elevation or height, h

∴ GPE = m × g × h

The Kinetic Energy, KE = 1/2  × The mass × The square of the velocity, v²

KE = 1/2 × m × v²

At point A;

The parameters are;

h = 100m, v = 0 (Starting point), Cart mass, m = 60 kg, we have;

GPE = m × g × h = 60 × 9.8 × 100 = 58800

GPE = 58800 J

KE = 1/2 × m × v² = 1/2 × 60 × 0² = 0

KE = 0 J

Mechanical Energy, ME = GPE + KE = 58800 + 0 = 58800 = Constant

ME = 58800 J

At point B;

GPE = 60 × 9.8 × 75 = 44100

GPE = 44100 J

KE = ME - GPE = 58800 - 44100 = 14700

KE = 14700 J

At point C;

GPE = 60 × 9.8 × 0 = 0 J

KE = ME - GPE = 58800 - 0 = 58800

KE = 58800 J

At point D;

v = 0, the Cart is brought to rest by the spring

GPE = 60 × 9.8 × 50 = 29400

GPE = 29400 J

KE = ME - GPE = 58800 - 29400 = 29400

KE = 29400 J

The Elastic Potential Energy EPE gained by the spring = KE = 29400

EPE = 29400 J.

Answer:

Isaac Newton discovered that as an object's mass increases, the gravitational attraction of that object increases. Thus, the gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon.

hope this helps!

True. When a car comes to a stop, its kinetic energy is converted into internal energy, primarily in the form of heat, in its brakes.

This process is known as braking or deceleration. As the brakes apply frictional force to the moving wheels, the kinetic energy of the car is transferred to the brake components, causing them to heat up. This conversion of energy from kinetic to internal energy is necessary to bring the car to a stop. The heat generated in the brakes is dissipated into the surrounding environment, typically through conduction, convection, and radiation, allowing the car to cool down.

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Position one on the ignition switch allows you to use accessories with the engine offThe above statement is True.

Position one on the ignition switch, sometimes labeled as "ACC" or "Accessory," allows you to use certain electrical accessories in your vehicle without turning on the engine. This position provides power to the radio, power windows, and other electrical systems that don't require the engine to be running. It is commonly used when you want to listen to the radio or charge your phone without draining the car's battery or running the engine unnecessarily.

However, it's important to note that using accessories while the engine is off will still drain the car's battery over time, so it's generally recommended to limit accessory use when the engine is not running.

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Answer:

The Northern flowing stream will affect the coast of Europe by  making  climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current

Explanation:

The Northern flowing stream will affect the coast of Europe because the North Atlantic current causes the Gulf stream to be split into two ( 2 ) and the Northern stream which is a warm stream crossing over to Northern Europe. The Gulf stream makes climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current

The classification of stars based on their spectral type follows the sequence O, B, A, F, G, K, and M, with O-type stars being the hottest and M-type stars being the coolest. The habitable zone, also known as the "Goldilocks zone," refers to the region around a star where conditions may be suitable for the existence of liquid water on the surface of a planet.

G-type stars, such as our Sun (classified as G2V), are considered to be within the optimal range for habitability. These stars have a stable and long-lasting main sequence phase, providing a relatively steady energy output over billions of years. Planets orbiting within the habitable zone of a G-type star have the potential to maintain a stable climate, with the right conditions for liquid water to exist. While other star types like F-type, K-type, and even some M-type stars can have habitable zones, G-type stars are generally considered to provide more favourable conditions for life.

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In the negative y-direction, the magnetic force acting on the particle is -7.2 10⁻¹⁵ N.

The Lorentz force is experienced by a charged particle moving at speed v through a magnetic field B and an electric field E. The Lorentz force is the name given to the whole electromagnetic force F acting on the charged particle. F is the perpendicular to the plane that contains both v and B.

F = qv x B

In this case, we have:

q = 1.0 × 10⁻¹⁹ C

v = 6.0 × 10⁴ m/s i

We can plug these values into the formula and calculate the cross product:

F = qv x B = (1.0 × 10⁻¹⁹ C)(6.0 × 10⁴ m/s i) x (0.4 i + 1.2 k) T

F = (6.0 × 10⁻¹⁵ i) x (0.4 i + 1.2 k) T

F = (2.4 × 10⁻¹⁵ i² + 7.2 × 10⁻¹⁵ i k) N

Note that i x i = 0 and i x k = -k x i = -j. Therefore, the magnetic force can be simplified to:

F = -7.2 × 10⁻¹⁵ j N

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The stopper of the thermos flask decreases convectional and conductional energy transmission. To reduce the loss of heat energy via the flask's opening, the stopper is often constructed of an insulating material.

The vessel's mouth is sealed off with a cork-based insulating stopper. On an insulating pad made of cork, the vessel is stored. It has thermal insulation as a result.

Insulators are employed to prevent or limit the transfer of heat energy through conduction, convection, or radiation. In order to limit convection, solid materials are frequently employed. Radiation is reflected by reflecting insulators.

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Question:

In the thermos flask shown:

The stopper reduces energy transfer by

The air gap reduces energy transfer by.

stopper

air gap

The correct answer is velocity.

The vector measure of level and direction of motion is known as velocity. The speed at which an object goes in one direction is known as its velocity. Speed may be used to calculate both the speed of the car traveling north on the major highway and the speed of the rocket bursting in space. As you may expect, the vector velocity's scalar size (total value) corresponds to the movement's speed. Speed is the initial exit of a place in terms of time when it comes to computations. A straightforward formula that incorporates measurement, distance, and time can be used to determine speed.

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Answer: The answer is A

Explanation: I took that test already

Compounds 1 and 3 are ionic. Because Ionic compounds are composed of oppositely charged ions that are attracted to one another, they require more energy to melt than covalent bonds. Hence, option A is correct.

Melting point of a substance is the temperature at which it converts from solid to liquid state. Melting point depends on the bond strength, molecular mass, temperature and pressure.

As the bond strength increases, the more energy have to be applied to weaken the intermolecular forces in solid to convert to liquid form. Ionic bonds are the strongest bond type. Thus, ionic compounds have highest melting point.

Therefore, the compounds 1 and 3 having highest melting point are ionic compounds. Remaining two with lower melting point are covalent. Therefore, option A is correct.

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