Within visible light, violet has the lowest frequency.
a. True
b. False

Answer:

A

Explanation:

A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.

Answer:

a battery, a coil of wire and a compass

Explanation:

A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.

Final answer:

Nicolaus Copernicus is credited with challenging the geocentric model and proposing a sun-centered solar system, which was later supported by other astronomers like Tycho Brahe, Johannes Kepler, and Galileo Galilei.

Explanation:

The scientist who is credited with proposing the idea of a sun-centered solar system is Nicolaus Copernicus. Before the 16th century, the prevailing model of the cosmos was geocentric, developed by Aristotle and Ptolemy, with the Earth at the center. However, Copernicus challenged this view in his treatise "On the Revolutions of the Celestial Spheres", initiating a paradigm shift towards a heliocentric model. This change was further supported by the observations and analyses of Tycho Brahe, Johannes Kepler, and Galileo Galilei, as well as the theoretical framework provided by Isaac Newton's laws of motion and universal gravitation.

As a sound wave moves away from its source, its amplitude decreases due to an inverse square relationship, meaning it is divided by four as the distance doubles. The decrease is also due to energy spread over a larger area, absorption by objects, and conversion into thermal energy.

As thunder, which is a form of sound wave, travels away from a lightning channel, the amplitude (loudness) of the sound decreases by one-quarter as the distance from the channel doubles. This happens due to an inverse square relationship with distance from the source. Essentially, as the sound wave moves further away from its origin, the intensity declines because the energy of the wave is spread over a larger area.

Moreover, the amplitude of a sound wave decreases with distance from its source also due to factors like absorption by objects and conversion to thermal energy by the viscosity of air. Thus, the further away you are from the source of the sound, in this case, the lightning channel, the softer the thunder will sound.

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Answer:

Speed of the 100 kg crate, v = 136 m/s

Explanation:

It is given that,

Force exerted by a motor, F = (600+2 s²) N

mass of the crate, m = 100 kg

We have to find the speed of the crate. Force is given by the product of mass and acceleration.

F = m a

g is acceleration due to gravity

[tex]F=m\dfrac{d^2s}{dt^2}[/tex]

[tex]\dfrac{d^2s}{dt^2}=\dfrac{600+2s^2}{100}[/tex]

[tex]\dfrac{d^2s}{dt^2}=6+0.02s^2[/tex]

[tex]\dfrac{d^2s}{dt^2}-6-0.02s^2=0[/tex]

or

s"- 6 - 0.02 s² = 0

On solving the above differential equation using calculator with when initially the crate is at rest s(0) = 0 and s'(0) = 15 m

[tex]s(t)=150\ e^{-\sqrt{2}t}+150\ e^{\sqrt{2}t}-300[/tex]

Differentiating above equation w.r.t t to get velocity of the crate.

So, v = 136 m/s

Hence, this is the required solution.

Hello. This question is incomplete. The full question is:

"Which statement best compares the accelerations of two objects in free fall?  1.The heavier object has a greater acceleration. 2.The object that has the greater surface area has the lower acceleration 3. The object that has the smaller mass has the greater acceleration 4.The objects have the same acceleration "

Answer:

The objects have the same acceleration.

Explanation:

The free fall movement was studied by the Italian physicist Galileo Galilei. According to his studies, Galileo showed that bodies in free fall, even those of different masses, would reach the ground at the same time, as they would be subject to the same acceleration. The free fall is, therefore, a movement described by the bodies, abandoned at a certain height, which happens exclusively by the effect of local gravity. In this type of movement, we disregard the effect of drag or friction forces.

False, you can't only use it to find the volume of liquids

The given statement is false.

At its most fundamental level, volume exists absolutely as a measure of space. When calculating the volume of a liquid, sometimes directed to as capacity, the units liters (L) and milliliters (mL) exist used. Devices used for this measurement include graduated cylinders, beakers, and Erlenmeyer flasks.

Graduated cylinders arrive in a range of sizes, or volume capacities, and much like a measuring cup, volume stands measured by adding liquid to the cylinder and corresponding the liquid level to the graduated scale. The measured volume compares to the volume of liquid contained in the cylinder.

The given statement is false. you can't only use it to find the volume of liquids.

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Using the Ideal Gas Law (PV=nRT), we calculate that there are approximately 128.94 moles of oxygen in a 12.5 L tank at a pressure of 25325 kPa and a temperature of 22°C.

To calculate the number of moles of oxygen in a 12.5 L tank at a pressure of 25325 kPa and a temperature of 22°C, we use the Ideal Gas Law, which is given by:

PV = nRT

Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, convert the temperature to Kelvin:

T = 22°C + 273.15 = 295.15 K

Next, convert the pressure to atm:

P = 25325 kPa × 0.00986923 atm/kPa ≈ 249.94 atm

Using the gas constant R = 0.0821 L·atm/(mol·K), we substitute the values into the Ideal Gas Law:

n = PV / RT = (249.94 atm × 12.5 L) / (0.0821 L·atm/(mol·K) × 295.15 K)

Solving this:

n ≈ (3124.25 atm·L) / (24.229215 mol·K)

n ≈ 128.94 moles

Therefore, under the given conditions, there are approximately 128.94 moles of oxygen in the tank.

Answer:

B) The unit of the variable on the y-axis is incorrect.

Explanation:

The question to this exercise is in the picture. It is '' What makes the above graph incorrect? ''

Let's analize each option :

A) The variables are plotted along incorrect axes. This is wrong because actually the graph is well-plotted. In a displacement versus time graph we put the time variable in the x-axis and the displacement variable in the y-axis.

B) The unit of the variable on the y-axis is incorrect. This is true. In the graph we can see that [tex]''Displacement(\frac{m}{s})''[/tex] when the units of displacement are units of lengths such as meters or miles for example. Therefore, the B) is a correct option

C) The scale for each axis is not appropriate for the data. This is wrong. Because of the scale for each axis we are able to see the five  data points which are (1,2) ; (2,4) ; (3,6) ; (4,8) and (5,10)

D) The data points have not been plotted clearly. This is wrong. All data points are well-plotted signposted with a point at the intersection of the dashed coordinated lines. For example, the point (1,2) is at the intersection of two lines : one dashed line perpedicular to the x-axis at 1 and one dashed line perpendicular to the y-axis at 2

E) The data points have not been plotted accurately. This is wrong. The data points have been plotted accurately at the intersection of the coordinated dashed lines.

Finally, the only correct option is B)

When two velocities combine, to a ground observer, a package dropped from a plane falls at an angle, but to a pilot moving with the package, it appears to fall vertically. Using Pythagorean theorem, we calculate the speed of the pilot as √(v1^2 - v2^2).

This is a Physics problem that deals with relative velocities. We need to evaluate what is observed by two different observers stationed at different places. The first observer is stationary and they view the package at an angle with the speed v1. The second is a pilot who perceives the same package dropping vertically with the speed v2.

In this scenario, the package has two independent velocities, a horizontal one (which is the speed of the airplane), and a vertical one (which is the speed of the package falling down). To the observer on the ground (which is stationary), both these speeds combine, resulting in the package falling at an angle. But to the pilot, who moves with the package horizontally, only sees the vertical fall. Therefore, they perceive the package falling downwards with the speed v2.

Using the Pythagorean theorem for velocity addition for perpendicular components, we know that v1^2 = (speed of the pilot)^2 + v2^2. Therefore, using algebra, we find the speed of the pilot to be √(v1^2 - v2^2).

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Answer: Vacuoles

Explanation: Vacuoles are large bubble found in the cells. They are found both in plants and animals.

The vacuoles found in the animal cells are comparatively smaller as compared to plants.

They store food or any other variety of nutrients that the cell might need in order to survive. Those substances can be carbohydrates, protein, salts and proteins.

They can also store the waste materials of the cell.

Warm front

Stationary front

Occluded front

Answer:

C. Sore eyes, sore muscles, and lapses in short term memory

Explanation:

Fatigue refers to an overall feeling of tiredness or a lack of energy in accomplishing tasks, e.g. driving.

Causes of fatigue while driving  include;

Symptoms of fatigue  while driving

Fatigue is easy to detect, with symptoms including:

Answer:

A. Rubbing converts neutrons to protons, increasing the charge

Explanation:

Rubbing two objects creates static electricity. It is also known as charging by friction.  When two objects having different electron affinity are rubbed together, the one with greater electron attraction rips off the electrons from other object. In this way charge is transferred from one to another. The one losing the electrons becomes positively charged and the one gaining the electrons becomes negatively charged. Neutrons do not convert to protons. Thus, this is a wrong statement.

Answer:  Groundwater exists only in regions that get a lot of rain.

Groundwater is the reservoir of water this water accumulates in the ground surface or subsurface of the earth crust through tiny pores and fractures in the rocks. The source of water are streams of rivers, oceans, lakes and large depositing is because of water from the rain and melting of the snow. It is a source of freshwater in nature.

According to the above description, Groundwater exists only in regions that get a lot of rain can be considered as correct option.

Answer:

semantic.

Explanation:

100% correct

No one is exactly sure. But its estimated to be 14 billion years old.