if we measure the speed of rotation of a system (held together by gravity) at different distances d from the center, and we find that it does not fall as but that it stays more or less flat as far as we can measure it, it means that

Answer: Yes, on many slate-roofed homes as temperatures change, such as cooling at night or heating during the day, thermal expansion or contraction of the slates may cause movement that in turn causes snapping, popping, or cracking noises, even bangs and clanks or clicks from the roof.

Explanation:

Answer:

because of its mealting

Explanation:

hope it helps you

Answer:

\(E = 2.9775\times10^5 J\)

Explanation:

Given:  The latent heat of fusion for Aluminum is \(L = 3.97\times10^5 J/Kg\)

mass to be malted m = 0.75 Kg

Energy require to melt E = mL

\(E = 3.97\times10^5\times0.75 = 2.9775\times10^5 J\)

Therefore, energy required to melt 0.75 Kg aluminum

\(E = 2.9775\times10^5 J\)

Answer:

Social learning occurs when four processes are present: 1) Attention: The learning organism must be paying attention to the modeled behavior. If there is no attention, the behavior cannot be processed into memory. 2) Retention: The learning organism must remember the behavior that was modeled.

Explanation:

Hope this helps.

Answer:

Social learning occurs when four processes are present:

1) Attention: The learning organism must be paying attention to the modeled behavior. If there is no attention, the behavior cannot be processed into memory.

2) Retention: The learning organism must remember the behavior that was modeled. If the behavior is not retained, it cannot be replicated.

3)  Reproduction: The learning organism must be capable of producing the behavior. If the behavior is too skilled or impossible for the organism to replicate, then the reproduction will be unskilled or halting.

4) Motivation:  The learning organism must be motivated to perform the behavior, or motivated not to perform the behavior.  If the organism is not motivated to perform the behavior, and even if the organism is able to perform the behavior and knows how, it may not.

Answer: A: electron shells outside a central nucleus

B: hard, indivisible sphere

C: mostly empty space

Which list of atomic model descriptions represents

the order of historical development from the earliest

to most recent?

Explanation:

3

Atomic models have been proposed throughout history describing the possible arrangements of different particles inside the atoms.

Thus, the correct order of atom model is B C A. Hence, the correct answer is option C.

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Answer:

Can't see the pic

Explanation:

Answer:

the density of water is 1 and tin is 7.31 if i remember right

Explanation:

Answer:

earth's crust

meatle

outercore

innercore

Answer:

the crust

the mantle core

the outer core

the inner core

Answer: Radio waves

Explanation:

Radio waves can travel through space. So, if you're wearing a space suit that contains a radio unit and one of your buddies sends you a radio message that there's pizza in the space station, you'd be able to hear it. That's because radio waves aren't mechanical -- they're electromagnetic. Electromagnetic waves can transmit energy through a vacuum.

Answer:

Above

Explanation:

yes

The phases of the moon if at sunset in the northern hemisphere the moon is in each of the following positions: Near the eastern horizon: Full moon; High in the southern sky: First quarter; In the southeastern sky: Waxing gibbous ; In the southwestern sky: Waning gibbous.

The moon's phases are determined by the position of the moon relative to the sun. At sunset, the moon is always on the opposite side of the Earth from the sun. So, the phase of the moon will depend on how much of the moon's illuminated side is facing the Earth.

If the moon is near the eastern horizon at sunset, then the entire illuminated side of the moon is facing the Earth. This means that the moon is full.

If the moon is high in the southern sky at sunset, then half of the illuminated side of the moon is facing the Earth. This means that the moon is in its first quarter phase.

If the moon is in the southeastern sky at sunset, then more than half of the illuminated side of the moon is facing the Earth. This means that the moon is in its waxing gibbous phase.

If the moon is in the southwestern sky at sunset, then less than half of the illuminated side of the moon is facing the Earth. This means that the moon is in its waning gibbous phase.

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2.25 m/s² of acceleration is required to increase the speed of a car from 26 mi/h to 51 mi/h in 5 seconds.

To find the answer, we need to know about the acceleration.

Thus, we can conclude that the constant acceleration is 2.25 m/s².

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The mass of 2 kg is undergoing the greatest amount of acceleration in this scenario.

According to Newton’s second law of motion, force is equal to mass times acceleration.

The formula can be mathematically represented as:Force = mass × accelerationOr acceleration = force / massWhen a force is applied to an object, it causes acceleration.

The acceleration of an object depends on its mass and the amount of force applied to it.

In this scenario, two masses of 2 kg and 6 kg respectively are being acted upon by two different forces of 8 N and 24 N respectively.

Using the above formula, we can calculate the acceleration of both the masses as follows:For 2 kg mass,Acceleration = Force / MassAcceleration = 8 N / 2 kgAcceleration = 4 m/s²For 6 kg mass,Acceleration = Force / MassAcceleration = 24 N / 6 kgAcceleration = 4 m/s²

Therefore, both the masses are undergoing the same amount of acceleration.

Summary:So, the mass of 2 kg is undergoing the greatest amount of acceleration in this scenario.

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In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.

They substitute astronomical units, or AU, which represent the typical separation of the Earth from the sun. That translates to around 93 million miles, 150 million kilometers, or 8 light-minutes.

It is simpler to visualize relative distances in space when thinking in terms of astronomical units.  An astronomical unit is 92,955,807 miles in exact distance (149,597,871 km).

The orbit of the Earth around the sun is not a complete circle. Consequently, during the year, Earth's distance from the sun varies. Earth is approximately 0.983 AU from the sun when it is at perihelion, which occurs in January.

Therefore, In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.

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The moment of inertia of the wheel and the weight together is \(0.59 \ kg m^2\).

To calculate the moment of inertia of the wheel with a weighted side, we'll first find the moment of inertia of the wheel and the weight separately, and then sum them up.
The moment of inertia (I) of a thin wheel (or a hoop) is given by the formula:
\(I_{wheel} = M_{wheel} * R_{wheel}^2\)
where \(M_{wheel}\) is the mass of the wheel (5.0 kg) and \(R_{wheel}\) is its radius (0.32 m).
\(I_{wheel} = 5.0 \ kg \times (0.32\  m)^2 = 5.0 \ kg \times 0.1024 \ m^2 = 0.512 \ kg m^2\)

Next, we'll find the moment of inertia of the small weight, which can be considered as a point mass. The formula for the moment of inertia of a point mass is:
\(I_{weight} = M_{weight} \times r^2\)
where M_weight is the mass of the weight (1.45 kg) and r is the distance from the center of the wheel (0.23 m).
\(I_{weight} = 1.45 \ kg \times (0.23 \ m)^2 = 1.45 \ kg \times 0.0529 \ m^2 = 0.0767 \ kg m^2\)

Now, we'll add the moments of inertia of the wheel and the weight to find the total moment of inertia about the axis through the wheel's center of mass (cm), perpendicular to its face:
\(I_{total} = I_{wheel} + I_{weight} = 0.512 \ kg m^2 + 0.0767 \ kg m^2 = 0.5887 \ kg m^2\)
Expressing the answer using two significant figures, the total moment of inertia is \(0.59 \ kg m^2\).

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Answer:

Given - M = 20 kg

k = 0.4

F = 200 N

To find - acceleration

Solution -

F= kMA

200 = 0.4 * 20 * acceleration

200 = 8 * a

a = 8/200

a = 0.04 m s²

The Richter scale measures the magnitude of an earthquake, which is a measure of the energy released by the seismic waves generated by the earthquake.

Measures are the steps taken to achieve a desired outcome. They can be in the form of legislation, policies, regulations, practices, procedures, and processes. They are used to implement and enforce objectives, goals, and strategies, and can be both proactive and reactive. Measures can be utilized by governments, businesses, and individuals to ensure desired outcomes are achieved in a timely and cost-effective manner. Measures can also be used to monitor progress and evaluate the effectiveness of policies and procedures.

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Given that,

A truck drives to a rock quarry at a speed of 20 m/s. The truck takes on a load of rocks, which doubles its mass, and leaves at the same speed of 20 m/s.

To find,

Comparison of the kinetic energy of the truck as it left the quarry with its kinetic energy on the way to the quarry.

Solution,

Kinetic energy of an object is given by:

\(K=\dfrac{1}{2}mv^2\)

m is the mass of the truck

\(K=\dfrac{1}{2}m\times (20)^2\\\\K=200m\ J\)

If mass is doubled and speed is same i.e. 20 m/s, neew kinetic energy is given by :

\(K=\dfrac{1}{2}\times (2m)\times 20^2\\\\K=400m\ J\)

It can be seen that when mass of truck is doubled, its kinetic energy gets doubled.

Answer:

This is one of  the mysteries  of quantum mechanics - a  single photon in classical mechanics is sent out in a circular arc - but when the arc interacts with a distant object the entire wave front collapses and delivers the entire energy of the photon to the object in question.

An analogy has been give as a pop  bottle thrown into the water in New York with its energy spreading out in a circular arc and at some time later  the wave front strikes a pop bottle in the water in Japan with the result of the wave front delivering its entire energy to the bottle with the bottle jumping out of the water.

Answer: 1000

Explanation:

Its double her weight

Answer:

3000J

Explanation:

- formula work done is force x perpendicular distance.

- convert 20cm to m, so 20 divide by 100 equals 0.2.

- since there is 20 stairs, 20 multiply by 0.2m.

- lastly, 750N x 4m equals 3000J

The kinetic energy of the electron accelerated by a 30 kV source is approximately 4.8 x 10^(-14) Joules.

Voltage (V) = 30 kV = 30,000 volts

Charge of an electron (e) = \(1.6 x 10^(-19) C\)

Calculating the potential energy -

P = e x  V

An object's motion gives it kinetic energy, which is a type of energy. It is described as the amount of effort required to accelerate a body of a specific mass from rest to its specified velocity. As Potential energy is equal to kinetic energy, therefore calculating the kinetic energy:

Potential Energy = Kinetic Energy = e x V

Substituting the value -

\(= (1.6 x 10^(-19) C) x (30,000 V)\)

\(= 4.8 x 10^(-14) J\)

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N₂ / N₁ = 13.3

A transformer is a device that changes the voltage in the primary, causing a voltage to be induced in the secondary. The expression for this voltage ratio is

ΔV₂ = N₂ /N₁ ΔV₁

where N is the number of windings on each side and V2 and V1 are the voltages in the secondary and primary, respectively.

They state that the primary voltage in this instance is 9.0 V and the secondary voltage is 120 V.

ΔV₂ /ΔV₁ = N₂ / N₁

N₂ / N₁ = 120/9

N₂ / N₁ = 13.3

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A 9.0-V battery (with nonzero resistance) and switch are connected in series across the primary coil of a transformer. The secondary coil is connected to a light bulb that operates on 120 V. Determine the ratio of the secondary to primary turns needed for the bell's transformer. Determine the ratio of the secondary to primary turns needed for the bells transformer. Ns/Np=?

(a) The work done is 1.50 x 10^-6 J

(b) The potential of the starting point with respect to the endpoint is 357.14 V.

(c) The magnitude of E is 5952.38 N/C.

Given that,

Charge = 4.20 nC

Distance = 6.00 cm

Kinetic energy K.E = 1.50 x 10^-6 J

The particle start from rest. So, the initial kinetic energy i zero.

(A) We need to calculate the work by the electric force

Using formula of work done

W = ∆K.E

W = K.Ef - K.Ei

Put the value into the formula

W = 1.50 × 10^-6 - 0

W = 1.50 x 10^-6 J

The work done is 1.50 x 10^-6 J

(B). We need to calculate the potential of the starting point with respect to the endpoint

We know that.

Change in potential energy = change in kinetic energy

∆P.E = ∆K.E

So, U = 1.50 x 10^-6

Using formula of potential

V = U/q

Put the value into the formula

V = 1.50 × 10^-6/4.20 x 10^-9

V = 357.14 V

The potential of the starting point with respect to the endpoint is 357.14 V

(C) We need to calculate the magnitude of E

Using formula of work done

W = F x r (1)

Using formula of force

F = qE

Put the value in the equation (1)

W = qE x r

E = W/q x r

Put the value into the formula

E = 1.50 x 10^-6/4.20 x 10^-9 x 6.00 x10^-2

E = 5952.38 N/C

Hence, The magnitude of E is

5952.38 N/C

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\(f=(9.0\times{10}^{9}\frac{N.{m}^{2} }{ {c}^{2} })\frac{(3.2 \times{10}^{ - 9}c) \: (9.6 \times {10}^{ - 9}c) }{(0.32 m)^{2}} \\ \\ f=(9.0\times{10}^{9}\frac{N.{m}^{2} }{ {c}^{2} })\ \frac{ \: 30.72 \times {10}^{ - 18} \: {c}^{2} }{ \: 0.1024 \: {m}^{2} } \\ \\f = \frac{9.0 \times {10}^{9} \times 30.72 \times {10}^{ - 18} }{0.1024} \: ( \frac{N.{m}^{2} }{ {c}^{2} } \: \times \frac{ {c}^{2} }{ {m}^{2} } )\\ \\ f = \frac{276.48 \times {10}^{ - 9} }{0.1024} \: ( \frac{N.{m}^{2} }{ {c}^{2} } \: \times \frac{ {c}^{2} }{ {m}^{2} } )\\ \\ f = 2700 \times {10}^{ - 9} N \\ \\ f = 2.7 \times {10}^{ - 6} N\)

I hope I helped you^_^

Answer:

Horse/Speed

55 mph

rounded to the tenth?  either 60 or 50

but 350 would stay like that  i believe!

Explanation:

Answer:

48 m

Explanation:

Two trains traveling towards one another on a straight track are 300m apart when the engineers on both trains become aware of the impending Collision and hit their brakes. The eastbound train, initially moving at 97.0 km/h Slows down at 3.50ms^2. The westbound train, initially moving at 127 km/h slows down at 4.20 m/s^2.

The eastbound train

First convert km/h to m/s

(97 × 1000)/3600

97000/3600

26.944444 m/s

As the train is decelerating, final velocity V = 0 and acceleration a will be negative. Using third equation of motion

V^2 = U^2 - 2as

O = 26.944^2 - 2 × 3.5 S

726 = 7S

S = 726/7

S1 = 103.7 m

The westbound train

Convert km/h to m/s

(127×1000)/3600

127000/3600

35.2778 m/s

Using third equation of motion

V^2 = U^2 - 2as

0 = 35.2778^2 - 2 × 4.2 × S

1244.52 = 8.4S

S = 1244.52/8.4

S2 = 148.2 m

S1 + S2 = 103.7 + 148.2 = 251.86

The distance between them once they stop will be

300 - 251.86 = 48.14 m

Therefore, the distance between them once they stop is 48 metres approximately.

Answer: The molecules in gases are different from other states of matter

Explanation:

The molecules in gases are different from other states of matter because unlike, for example, a solid, they move around freely and are much more spread apart. A gas can fill up any container, but once the container is unsealed, the gasses will immedietly be let out. Gases can be compressed much more easily than a solid or a liquid.

Answer:

It has potential energy and then the eg=nergy goes to the bug killing it becay=use of the force

Explanation:

"use the force luke"

Answer:

It has potential energy and then the energy goes to the bug killing it because of the force

Explanation:

The change in potential energy when the block falls to the ground is 477.7 J.

The change potential energy can be calculated using the formula ΔPE = mgh, where ΔPE is the change in potential energy, m is the mass of the block, g is the acceleration due to gravity, and h is the height the block falls from.

In this scenario, the block weighs 40.0 N, which is equivalent to a mass of approximately 4.08 kg (since weight = mass x acceleration due to gravity). The acceleration due to gravity is approximately 9.81 m/s^2. The block falls from a height of 12 m. Therefore, using the formula ΔPE = mgh, we can calculate the change in potential energy:

ΔPE = (4.08 kg)(9.81 m/s^2)(12 m) = 477.7 J

The change in potential energy when the block falls to the ground is 477.7 J.

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