Classify each material as polymer or a composite
40 points

The density of cool and warm air molecules is the same.

Cool air is however more dense because of the number of molecules in a unit volume. Thus, cool air should sink within warm air.

Answer:

It emits alpha and beta particles.

Explanation:

EDG 20

Answer:

the answer is b, calcium-45

Explanation:

I don't know the answer it is too much hard for me

Answer:

D. Combustion and subsequent gas expansion will not occur.

Explanation:

I got it right on the test.

If the spark plug on a heat engine is not functioning properly, combustion and subsequent gas expansion will not occur.

Heat engines refer to those engines that function via the combustion of a fuel.  This fuel is burnt in a combustion chamber and the energy generated enables the system to work.

The function of the spark plug is to create the explosion which makes the engine produce power. If the spark plug on a heat engine is not functioning properly, combustion and subsequent gas expansion will not occur.

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The Carnot refrigerator operates on the principle of transferring heat from a cooler region to a hotter region with the help of external work. The amount of heat that the refrigerator can remove from its inside compartment can be determined using the equation:

QC = W*(TC/TH - 1)



Efficiency (η) = (Tc / (Th - Tc))

Where Tc is the cold temperature (inside the refrigerator) and Th is the hot temperature (kitchen temperature). In this case, Tc = 277 K and Th = 287 K.

First, calculate the efficiency:

η = 277 / (287 - 277) = 277 / 10 = 0.277

Next, we can use the formula for the heat removed from the inside compartment, which is given by:

Qc = W / η

Where Qc is the heat removed and W is the work done. In this case, W = 2250 J.

Finally, calculate the heat removed:

Qc = 2250 / 0.277 ≈ 8103 J

So, the refrigerator can remove approximately 8103 Joules of heat from its inside compartment using 2250 Joules of work.

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The electronic specific heat is temperature dependent and much less than expected from classical behavior due to quantum mechanical effects and the limited available states for electrons at low temperatures.

The electronic specific heat refers to the amount of heat energy required to raise the temperature of a material by a certain amount, specifically due to the thermal excitation of electrons. In classical physics, one would expect the specific heat of a free electron gas to be constant and independent of temperature. However, in reality, the electronic specific heat is temperature dependent and significantly lower than what classical theory predicts. This behavior can be understood through quantum mechanics and the concept of energy quantization.

At low temperatures, electrons in a material occupy discrete energy levels, forming a distribution known as the Fermi-Dirac distribution. According to quantum mechanics, these energy levels are quantized, meaning that electrons can only occupy certain allowed energy states. As the temperature increases, some of the lower energy states become occupied, leading to an increase in the electronic specific heat. This behavior is often observed in metals and semiconductors.

Additionally, at low temperatures, the available energy states for electrons become limited. This is because the energy levels closer to the Fermi level, which represents the highest occupied state at absolute zero, are already filled. As a result, only a small number of higher energy states are available for thermal excitation, leading to a lower electronic specific heat.

In summary, the temperature dependence and reduced value of the electronic specific heat compared to classical expectations can be attributed to quantum mechanical effects, such as energy quantization and the limited availability of energy states for electrons at low temperatures.

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The heat energy the surrounding air gained is 755 j.

Energy is a quantitative property given to a body or physical system and can be identified as work being done in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. Energy is the ability to do work. It can exist in electrical, kinetic, thermal, electrical, chemical, nuclear, or other forms.

Concept:-

Since the energy is always conserved, the energy lost by the hot water is gained bt the surrounding

- energy lost  = + energy gained by the surrounding

- 755 j = + 755 j

Energy exists in many forms. Examples include light energy, thermal energy, mechanical energy, gravitational energy, electrical energy, acoustic energy, chemical energy, and nuclear or atomic energy. Each form can be transformed or changed into other forms.

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Answer:

b,d,f

Explanation:

Answer:

U = - ∫ F dx

U = - 3F₀

Explanation:

Force and potential energy are related

         F = \(- \frac{dU}{dx}\)

         dU = - F dx

        ∫ dU = - ∫ F dx

        U- U₀ = - ∫ F dx

to solve the problem we must know the form of the force, if we assume that F = F₀ and U₀ = 0 for x = 0

         U = - F₀ 3

Answer:

Momentum = 15 kg m/s

Explanation:

Momentum = Mass × Velocity

= 0.5 × 30

= 15 kg m/s

Answer:

coins

Explanation:

A Coin sliding On an table experiences a friction force, if you give it some speed and let go it will stop.

Answer:

0.44 sec

Explanation:

k = 100 N/m, m = 0.50 kg

Period

Answer:

The difference in tension,  between adjacent sections of the pull cable at the given conditions is 17.701 kN

Explanation:

We take the cars as moving upwards such that the resultant pulling force on the car, F, along the cable is given by the relation

\(F_{car}\) = Upward tension force,  \(Tension_{(upwards)}\) - Downward tension force, \(Tension_{(downwards)}\) - Component of the weight of the car along the taut cable

The parameters given are;

Mass of car, m = 2750 kg

Angle of inclination of taut cables, θ = 35°

The upward acceleration of the car, a = 0.81 m/s²

Given that the weight is acting vertically downwards, we have;

Component of the weight of the car along the taut cable = m × g × sin(θ)

∴ Component of the weight of the car along the taut cable = 2750 × 9.81 × sin (35°) = 15473.66 N

We therefore have;

\(F_{car}\) =  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) - 15473.66 N

\(F_{car}\)  = m × a = 2750 × 0.81 =  \(T_{upwards}\) - \(T_{downwards}\) - 15473.66

∴  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) = 2750 × 0.81 + 15473.66 = 17701.16 N

Hence the difference in tension,  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) between adjacent sections of the pull cable if the cars are at the maximum permissible mass and are being accelerated up the incline = 17701.16 N or 17.701 kN.

Answer:

accelerated down the ramp

Explanation:

It can be concluded that the cart accelerated down the ramp is the correct choice.

Acceleration is the rate of change of velocity with time.

We see that as time increases, the velocity of the car also increase.

 Initially, the car is at rest with a velocity of 0cm/s. With the passage of time, as it slides down the ramp, the velocity increases to 25cm/s.

Since acceleration is the rate of change of velocity with time, it is glaring that the acceleration of the body greatly increased as it moves down the ramp

Answer:

0.16239316239316239316239

Explanation:

ang haba nang solve ko dito hehe

Answer:

Here is your ans

Explanation:

hope it helps you tq

When electromagnetic radiation is Doppler-shifted by motion away from the detector, the observed wavelength increases.

When an object emitting electromagnetic radiation, such as light, is moving away from an observer (detector), the wavelengths of the observed radiation are stretched or increased.

This phenomenon is known as the Doppler shift. It occurs because the motion of the source affects the perceived frequency or wavelength of the radiation. When the source is moving away, the observed wavelength is longer compared to the emitted wavelength.

This effect can be observed in various contexts, such as the redshift observed in the light from distant galaxies, indicating their recession from us due to the expansion of the universe.

Additionally, it is relevant in understanding the behavior of stars, galaxies, and other astronomical objects. By analyzing the Doppler shift, scientists can infer important information about the motion and velocity of celestial objects.

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Answer:

The root pass is made with a 5/32” (4.0mm) diameter electrode. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity.

Explanation:

In root pass welding, that electrode we are going to use cellulosic electrode (E-XX10).

Short arc welding is commonly used for root pass welding to prevent blow through and overheating at the weld joint. Because there is less drooping and suck back, short arc welding is also commonly used on root pass joints.

The first pass in any welding process that combines two pieces or members into one structure is referred to as the root pass.

Subsequent passes raise the weld depth to the desired thickness, resulting in the required strength. The first pass usually serves as the foundation for subsequent filler passes.

A 5/32" (4.0mm) diameter electrode is used for the root pass. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity.

Thus, cellulosic electrode (E-XX10) for this.

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when the gravity of a massive star's collapsing core is able to overcome neutron degeneracy pressure, then The core contracts and becomes black hole.

What is degeneracy pressure:

Some neutron stars may have a surface layer of highly degenerate matter that is compressed to great density, but still has some protons

Unlike the main body of the neutron star which is Neutronium, matter compressed until it is all neutrons, packed together. Essentially a huge atomic nucleus.

The star cools and all remaining matter is bound by gravitation into a neutron star.

This object is composed primarily of degenerate neutron matter, this star will collapse into a black hole because gravity will overcome the neutron degeneracy pressure.

hence, when the gravity of a massive star's collapsing core is able to overcome neutron degeneracy pressure, The core contracts and becomes a black hole.

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Answer:

Parallel Circuits

Explanation:

Loads can be operated on their own. If you had a series circuit, adding another light would dim the rest!

Answer:

D

Explanation:

Trees are obviously effected from deforestation.

Pollution effects the things trees need to grow (water, air).

Reduction removes parts of the tree, some parts being needed.

Answer: D

Explanation:Trees are obviously effected from deforestation.

Pollution effects the things trees need to grow (water, air).

Reduction removes parts of the tree, some parts being needed.

Answer:

23 cm from the mirror

Explanation:

Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

Answer:

Patterson isolated lead from fragments of a meteorite that had struck Earth thousands of years ago, and determined the age of the fragments by analyzing proportions of the lead isotopes. The meteorite is assumed to have been formed at the same time as the rest of the solar system, including Earth

Explanation:

Answer:

The answer is 22.14 meters per second

Explanation:

I gotchu brother

Answer:

when a two bodies A and B are moving at an angle 180° with each other then the relative velocity is the sum of bodies the velocity .i.e,

when the bodies move the opposite direction

then their relative velocity is the sum of individual velocities.

the weaker the gravitational force.

because G=km1m2/r^2

Which shows, the greater the distance the weaker the gravitational force.

Answer:

1st box: increase

supporting evidence: As the girl swings downward she will gain more height due to the increasing force pushing her

2nd box: increase

supporting evidence: the magnetic force of the earth will increase the kinetic energy of the girl when she goes downward slightly as she swings forward

3rd box :increase

supporting evidence:As the girl swings downward she will gain more speed due to the gravitational pull

Explanation:

The range of each Amazon box that are launched from a horizontal conveyor belt is 1.62 m.

According to equations of motion,

s = ut + 1 / 2 at²

s = Distance

u = Initial velocity

t = Time

a = Acceleration

Since the conveyor belt is at a height of 1.4 m, it has a vertical motion when falling from the conveyer belt.

h = 1 / 2 gt²

1.4 = 1 / 2 * 9.8 * t²

t = √ 0.29

t = 0.54 seconds

The range is the horizontal distance covered,

\(d_{x}\) = \(V_{x}\) * t

\(d_{x}\) = 3 * 0.54

\(d_{x}\) = 1.62 m

Therefore, the range of each Amazon box that are launched from a horizontal conveyor belt is 1.62 m.

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