when the ice shuts off and the engine coolant temperature is reduced, what component compensates for the drop in pressure inside the closed coolant system?

a) The leaves of the electroscope separate when the perspex rod is brought close to the metal disc on top of the electroscope without touching it because the metal disk's electrons are attracted to the perspex and migrate away from the leaves.

This is due to the fact that the perspex rod was negatively charged by rubbing it with wool, which transferred some electrons from the wool to the perspex rod. As a result, some of the metal disk's electrons are pushed away in the direction of the electroscope's leaves since it is a conductor and encounters the repelling force of the negatively charged perspex rod. Because of this, the leaves have a negative charge, and because they all have a negative charge, they repel one another, resulting in the electroscope needle to deflect.

When the metal disk is touched with the wool cloth after charging the electroscope with the rubber rod, any excess charge on the electroscope is neutralized and the electroscope returns to its neutral state.

b) No, the wool cloth does not have the same charge as the acrylic rod. When the acrylic rod is rubbed with the wool cloth, some electrons are transferred from the wool to the rod, giving it a negative charge, while the wool loses some electrons and acquires a positive charge. Therefore, the wool cloth and the acrylic rod have opposite charges.

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Answer:

A popular set of Peg-Words

What is a Peg-Word?

They're easy to remember because they rhyme with the names of the first ten natural numbers, is: one is a bun, two is a shoe, three is a tree, four is a door, five is a hive, six is sticks, seven is heaven, eight is a gate, nine is wine, ten is a hen.

The speed of the vehicle is 62.8 m/s

We have the descent vehicle landing on the moon and the following information  are available;

vertical velocity toward the surface of the moon = 29.1 m/s

horizontal velocity = 55.6 m/s

Thus the speed along the descent path = √(29.1)^2 + ( 55.6)^2

= 62.8 m/s

Now the angle is obtained from;

180° - tan-1( 55.6/29.1)

= 118 degrees

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To find the least squares solution of the equation ax = b using the normal equations, we first construct the normal equations and then solve them.

The normal equations are given by:

A^T * A * x = A^T * b

where A is the coefficient matrix with dimensions m x n, x is the unknown vector of dimensions n x 1, and b is the vector of known values with dimensions m x 1.

To solve the normal equations, follow these steps:

1. Calculate the transpose of A: A^T.

2. Compute the matrix product of A^T and A: A^T * A.

3. Calculate the matrix product of A^T and b: A^T * b.

4. Solve the resulting system of equations A^T * A * x = A^T * b for x.

The solution vector x obtained from solving the normal equations will be the least squares solution of the equation ax = b.

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Answer:

2

Explanation:

Electric and hydrogen are promising alternative energy sources for transportation, offering benefits such as reduced emissions and lower operating costs, although they also face challenges related to infrastructure and production methods.

Electric and hydrogen are two promising alternative energy sources for transportation that have gained significant attention in recent years. Here are some key points about each:

Electric Vehicles (EVs): EVs use electricity stored in batteries to power an electric motor.

They offer several advantages, including zero tailpipe emissions, reduced dependence on fossil fuels, and lower operating costs compared to traditional internal combustion engine vehicles.

The growth of EV infrastructure and advancements in battery technology have contributed to their increasing popularity.

Hydrogen Fuel Cell Vehicles (FCVs): FCVs use hydrogen gas to generate electricity through a chemical reaction in a fuel cell, which then powers an electric motor. FCVs produce zero tailpipe emissions since the only byproduct is water vapor.

Hydrogen fuel can be refueled quickly, similar to traditional gasoline vehicles, providing a longer driving range compared to battery-powered EVs.

Both electric and hydrogen vehicles have their own set of challenges. For EVs, limited charging infrastructure and range anxiety remain concerns, although they have been improving over time.

Hydrogen FCVs face challenges related to hydrogen production, storage, and distribution infrastructure.

Additionally, the overall environmental impact of these alternative energy sources depends on the methods used for electricity or hydrogen production.

The adoption of alternative energy sources for transportation is a complex and evolving field.

It often involves a combination of technological advancements, policy support, and infrastructure development to enable widespread adoption and address existing challenges.

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Answer: 1.18

Explanation: The formula I used is:

f=1/(2pi) times the square root of k/m

F is the frequency, in this problem, 10 Hz.

K is the spring constant.

M is the mass.

So plugging everything in we would have:

10=1/(2pi)•sqrt x/0.00030

The answer I got was 1.18

Answer:

103.J

Explanation:

Given data

Mass= 5kg

Height= 2.1m

g=9.81m/s^2

Required

The potential energy

PE= mgh

substitute

PE= 5*9.81*2.1

PE=103.J

Answer:

True

Explanation:

If acceleration points in the same direction as the velocity, the object will be speeding up. And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.

Answer:

It would depend on the amount of years.

Explanation:

I don’t think this is very helpful-

Have a great day!

Anygays-

The likelihood of extinction for life in a star system varies depending on its distance from the center of the Milky Way due to factors such as stellar density, radiation levels, and the frequency of catastrophic events.

Closer to the galactic center, star systems experience higher stellar density, which increases the probability of gravitational interactions between stars. These interactions can disrupt planetary orbits, potentially ejecting planets from their star systems or causing them to collide with other celestial bodies. This poses a significant risk to the stability of life in these systems.

Additionally, the galactic center contains a supermassive black hole and numerous massive stars, which emit intense radiation. High radiation levels can be harmful to life, as they can damage cellular structures and cause mutations. This radiation can also strip away a planet's atmosphere, reducing its ability to support life.

Lastly, catastrophic events such as supernovae and gamma-ray bursts are more frequent near the galactic center. These events release immense amounts of energy and radiation, which can be lethal to life forms in nearby star systems.

As the distance from the galactic center increases, these factors become less significant, reducing the likelihood of extinction for life in those star systems. However, regions too far from the center may also have insufficient resources and elements necessary for life to develop.

In conclusion, the likelihood of extinction for life in a star system is influenced by its distance from the Milky Way's center due to factors such as stellar density, radiation levels, and the frequency of catastrophic events. Balancing these factors, star systems located at intermediate distances may offer the most favorable conditions for life.

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Answer:

\(\huge \boxed{\mathrm{12000 \ J}}\)

Explanation:

Work done (J)  =  Force (N) × Distance (m)

W  =  400  ×  30

W  =  12000

The work done is 12000 J.

In this case, we are given k = 11.7 for silicon and m* = 0.220me.
Please note that the calculation to find the numerical value of the smallest radius requires specific equations and formulas. If you provide those equations, I can help you with the step-by-step calculation.

When a phosphorus atom is substituted for a silicon atom in a crystal, it introduces an extra electron into the crystal lattice. This extra electron is attracted to the positive charge of the phosphorus nucleus. However, there are two important differences in the behavior of this electron compared to the electron in a hydrogen atom.

First, the Coulomb attraction between the electron and the positive charge on the phosphorus nucleus is reduced by a factor of 1/k, where k is the dielectric constant of the crystal. This reduction in attraction is due to the presence of the crystal lattice. As a result, the orbit radii of the electron are greatly increased compared to those in a hydrogen atom.

Second, the periodic electric potential of the lattice affects the motion of the electron, giving it an effective mass denoted as m*. This effective mass is different from the mass of a free electron (me). The influence of the lattice potential causes the electron to behave as if it has this effective mass.

To find the numerical value of the smallest radius, we need to substitute the given numerical values.

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Answer: D. 3.37m/s

Explanation:Just qnswerd iit

The measurement of body temperature is an example of a variable that uses option A, interval scale.

A scale with an interval has order and a meaningful difference between two values. Temperature (Fahrenheit), temperature (Celsius), pH, SAT score (200-800), and credit score are a few examples of interval variables (300-850).

One variable that uses interval scale is the measurement of body temperature.

Only ratio scales have a genuine zero, even though interval and ratio data can both be categorized, sorted, and spaced equally apart between consecutive values. As 0 is not the lowest attainable temperature, temperature in Celsius or Fahrenheit, for instance, is measured on an interval scale.

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The statement "two people share the same reference frame" in relativity is only true if they are both at rest relative to each other or moving with constant velocity relative to each other. This is known as the principle of relativity and is a fundamental concept in Einstein's theory of special relativity.

The principle of relativity states that the laws of physics are the same for all observers in uniform motion relative to one another. This means that if two people are moving with constant velocity relative to each other, they will see the same physical phenomena and make the same measurements, regardless of their relative motion. They are said to share the same reference frame.

However, if one person is accelerating, their measurements will be different from those of a person who is at rest or moving with constant velocity. This is because acceleration introduces additional forces and changes the observer's perspective on the physical phenomena they are observing.

Therefore, in order for two people to share the same reference frame in relativity, they must be at rest relative to each other or moving with constant velocity relative to each other.

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Light propogates from soda lime glass into pyrex glass of different refractive indices indicating a change in the medium which can be used to find out the critical angle.

The critical angle is the angle of incidence for which the angle of refraction comes out to be 90°. It is related to the refractive indices (Plural of refractive index) by the following relation:

Sini = 1/u, where u is the ratio of refractive index of medium 2 and medium 1

According to the question, Light propogates from soda lime glass (Medium 1, u1=1.518) into pyrex glass(Medium 2, u2=1.473), i.e. from a denser medium to rarer medium. So, the ratio of refractive index becomes u2/u1= 1.473/1.518=0.97

Putting the ratio in the above-mentioned formula,

∴ Sini = 1/0.97

i= 75.9°

Hence, the critical angle(i) for the given situation is 75.9°.

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We are asked to determine the magnitude of the force that acts parallel to the nail. To do that we will add the torque that acts on the point of contact. First, we draw a free-body diagram of the situation:

We have decomposed the force of the nail into its horizontal and vertical components. The horizontal component does no torque since there is no distance parallel to the force to the point of contact.

Now, we add the torques. We consider counterclockwise as positive:

Since we consider the moment before there is no angular acceleration the sum of torques adds up to zero:

Now, we determine the value of Ry as a function of "R" using the trigonometric function cosine:

Now, we multiply both sides by "R":

Now, we substitute in the sum of torques:

Now, we solve for "R". First, we add "30F" to both sides:

Now, we divide both sides by 5cm:

Now, we divide both sides by cosine:

Now, we substitute the values:

Solving the operations:

Therefore, the force on the nail is 1042.8 Newtons.

Answer:

Rubber soled sneakers make it harder to slip while running

Explanation:

Answer:

Aluminium

Explanation:

If we calculate the heat transfer for all the substances, we have

Mc(∆T)

Where M is mass

C is heat capacity

∆T is temperature change.

For iron

Mc(∆T) = 500 ×0.440×100= 22000J

For copper

Mc(∆T) = 500 ×0.385×100= 19250J

For aluminium

Mc(∆T) = 500 ×0.897×100= 44850J

Aluminium has the highest heat capacity and would take longest for this heat capacity to be dissipated under similar condition.

Answer:

600-750

Explanation:

The red color in the visible region lies in the wavelength of 600 – 750 nm. The visible light spectrum is the fraction of the spectrum that is visible to humans.

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometers, and other units since it is a distance measurement.

The portion of the spectrum visible to the human light is known as the visible light Spectrum.

Visible light has a range of wavelengths from about 400-750 nm. The red color in the visible region lies in the wavelength of 600 – 750 nm.

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Answer:

True

Explanation:

The nucleus contains all of the mass of the atom. Almost all of the mass of the atoms is made up of protons and neutrons.

Answer:

both the neutrons and protons are located in the nucleus of an atom.

The average speed of swimmer is 10 km/hr.

Speed is the rate of change of position of an object in any direction.

Distance is the total movement of an object without any regard to direction.

Given distance of pond is 1 km.

She swims 20 laps , i.e. total distance = 20 * 1 km = 20 km

Time taken to complete = 2 hr

There a relation between speed distance and time which is given by:                      

                         Speed = Distance / Time

                      ⇒Speed = 20/2 = 10 km/hr

So the average speed of swimmer is 10 km/hr.

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Answer:

Solids have a definite shape and volume, its particles vibrate slowly.

Liquids have no definite shape, the particles move randomly around its container, and they have a fixed volume.

The magnitude and range of gravity depends on he mass of the objects and their distance. The electromagnetic force of an electromagnetic component depends on the number turnings of the electromagnetic field and the current flowing through it.

Gravity or gravitational force is the force exerted by an object by which it attracts other objects into its centre of mass. Earth gravitationally pull every objects into its centre and we exeriance as our weight.

The  gravitational force between two objects is always dependant on the mass of the objects and the distance between them. Gravity is directly proportional to the mass and inversely proportional to the distance.

The electromagnetic force is associated with both electric field and magnetic field and is proportional to the field strengths. It is dependent n the current carried  and the turnings of coil by which magnetic field induction is created.

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Answer:

The Answer To This Question Is B

Explanation: Please Mark Brainliest!

Answer:

a is your answer.............

Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{p}{v} \\ \)

p is the momentum

v is the velocity

From the question we have

\(m = \frac{10}{20} = \frac{1}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

  d  The energy is transformed to sound and heat energy.

Explanation:

Each time the basketball bounces, it makes sound waves, and dissipates energy in the form of heat in the material of the ball and the surrounding air. There is no light or chemical change involved.