Which statement is true about a falling object? (Assume no
air resistance)
1. The kinetic energy of the object is conserved.

2.The difference between the kinetic and potential energy of the
object remains the same.

3.The potential energy of the object is conserved.

4.The sum of the kinetic and potential energy of the object remains
the same.

Answer:

El valor de la fuerza entre las cargas es 172.8 N.

Explanation:

La fuerza electromagnética o electrostática es la interacción que se da entre cuerpos que poseen carga eléctrica.

La ley de Coulomb se emplea para calcular la fuerza eléctrica que actúa entre dos cargas en reposo y habla sobre la influencia que tienen las cargas y  la distancia sobre la fuerza de atracción o repulsión de un cuerpo  cargado eléctricamente. Esta ley indica que la magnitud de cada una de las fuerzas eléctricas con que interactúan dos cargas puntuales en reposo es directamente proporcional al producto de la magnitud de ambas cargas e inversamente proporcional al cuadrado de la distancia que las separa. La fuerza es de repulsión si las cargas son de igual signo, y de atracción si son de signo contrario.

La ley de Coulomb se representa matemáticamente mediante:

\(F=k*\frac{q1*q2}{r^{2} }\)

donde:

En este caso:

Reemplazando:

\(F=9*10^{9} \frac{N*m^{2} }{C^{2} }*\frac{6*10^{-6}C *8*10^{-6}C}{(0.05 m)^{2} }\)

Resolviendo se obtiene:

F= 172.8 N

El valor de la fuerza entre las cargas es 172.8 N.

Fast moving rivers of air, known as jet streams, can reach speeds of 75 to 150 miles per hour (mph).

Jet streams are narrow bands of strong winds that flow in the upper levels of the atmosphere, typically between 25,000 and 35,000 feet above the Earth's surface.

These high-speed air currents are driven by the temperature and pressure gradients in the atmosphere, particularly between warm and cold air masses.

The jet streams flow in a wavy pattern from west to east, influenced by the rotation of the Earth and atmospheric conditions. They can extend thousands of miles in length and a few hundred miles in width.

Jet streams play a crucial role in weather patterns, affecting the movement of storms and the distribution of temperature and precipitation.

Aviation and weather forecasting heavily rely on understanding and monitoring the jet streams. Their high speeds can benefit air travel by reducing flight times for planes flying with the jet stream and increase fuel efficiency.

However, flying against the jet stream can result in longer flight durations and higher fuel consumption.

In summary, jet streams are fast-moving rivers of air with speeds ranging from 75 to 150 mph. They are important atmospheric phenomena that impact weather patterns and have implications for aviation and weather forecasting.

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Because a is not a function of t .

So d/dt of a is zero.

Answer:

wind energy

Explanation:

Wind energy can be defined as a form of a solar energy. It is generated by the immense force of the wind that blows in an area. Wind energy is a useful energy and is mostly used to generate electricity. It is clean source of energy.

In the context, trash can lid is being blown away by the wind energy and it is seen moving across the yard. The energy of the wind forces the lid of the trash can to move from one place to another against friction. Thus, wind energy caused the trash can lid to move across the yard as seen by a student.

When a sound enters a new medium where the sound travels faster, it means the vibration of particles is high, and the wavelength of the waves increases which means the speed of the wave has increased. The frequency on the other hand will remain constant.

Answer:

2.5 cm³

Explanation:

Use Boyle's Law

1×5=2×V

5=2V

V=5/2=2.5 cm³

Answer:

129.12 ml

Explanation:

If answer is correct feel free to replay me for explanation.

Answer: c) The line shows a change in speed if its angle changes.

I'm not sure

Explanation:

The quantum number of an electron confined in a 5.0-nm-long one-dimensional box, with a de Broglie wavelength of 2.0 nm, can be determined using the formula n = L/λ, where n is the quantum number, L is the length of the box, and λ is the de Broglie wavelength.

In a one-dimensional box, the allowed energy levels for a particle are determined by the length of the box and the de Broglie wavelength associated with the particle. The quantum number n represents the number of nodes or segments that can fit within the box.

Using the formula n = L/λ, we can calculate the quantum number by dividing the length of the box (L = 5.0 nm) by the de Broglie wavelength (λ = 2.0 nm).

Substituting the values, we get n = 5.0 nm / 2.0 nm = 2.5. However, quantum numbers must be integers, so we round down the result to the nearest whole number. Therefore, the quantum number for the electron confined in the 5.0-nm-long one-dimensional box with a de Broglie wavelength of 2.0 nm is 2.

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A wheel rotates at 36.0 rad/s, it takes approximately 0.17453 seconds for the wheel to complete one revolution, and the wheel completes approximately 45.84 revolutions in 8.00 seconds.

(a) To find out how long it takes for the wheel to complete one revolution, you need to divide the given angular velocity by the total angle in one revolution. The wheel rotates at 36.0 rad/s. One complete revolution is equal to 2π radians (approximately 6.28318 radians).

Step 1: Divide the angular velocity by the angle in one revolution.
Time = (Total angle) / (Angular velocity)
Time = (2π radians) / (36.0 rad/s)

Step 2: Calculate the time.
Time ≈ (6.28318 radians) / (36.0 rad/s) ≈ 0.17453 seconds

So, it takes approximately 0.17453 seconds for the wheel to complete one revolution.

(b) To find out how many revolutions the wheel completes in 8.00 seconds, you need to multiply the angular velocity by the time and then divide by the angle in one revolution.

Step 1: Multiply the angular velocity by the time.
Total angle = (Angular velocity) × (Time)
Total angle = (36.0 rad/s) × (8.00 s)

Step 2: Calculate the total angle.
Total angle = 288.0 radians

Step 3: Divide the total angle by the angle in one revolution.
Revolutions = (Total angle) / (2π radians)
Revolutions ≈ (288.0 radians) / (6.28318 radians)

Step 4: Calculate the number of revolutions.
Revolutions ≈ 45.84

So, the wheel completes approximately 45.84 revolutions in 8.00 seconds.

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Answer:

A

Explanation:

this is because the law of reflection states that the angle of incidence equals to the angle of the reflection.

hope this helps, if not please report it

someone else can try it

Answer:

The substance is Ethanol

Explanation:

To solve this problem we must use the expression of thermal energy calculation that relates the mass of a body with the specific heat of this and the temperature difference.

Q = m*Cp*(T_f - T_i)

where:

Q = amount of heat = 14.4 [kJ]

m = mass = 12 [kg]

Cp = specific heat [kJ/kg*K]

T_f = final temperature = 275.5 [K]

T_i = initial temperature = 275 [K]

Therefore we need to calculate Cp, and then compare this with the values in the given table attached.

Cp = 14.4/(12*(275.5 - 275))

Cp = 2.4 [kJ/kg*K]

Now we compare the Cp with the values given in the table.

So the substance is Ethanol

Answer: Force required to 25 joule work when the force causes a displacement of 0.5m is 50N

Explanation: To calculate the work done we use the formula

W=F.s                               (1)

W= work done

F=  force applied               s= displacement

Given, work done W= 25 joules= 25 J

displacement s= 0.5m

∴From equation (1) we get the force required when work is done and displacement is given, that is

F\(=\frac{W}{s}\)                                (2)

∴Force required \(F=\frac{W}{s}= \frac{25J}{0.5m}=50N\)            

(1 J is the work done by a force of 1 N acting over a displacement of 1 m and so 1 J= 1 Nm⇒ 1 N = 1 J/m)

ANS: Force required to do 25 J work when a force causes displacement of 0.5m = 50 N

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Answer:

Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

Explanation:

Answer:

Often the independent variable is plotted on the x-axis - and example might be time (an experiment where time is measured by a watch or an independent mechanical device)

The dependent variable is often plotted on the y-axis - and example here might be the velocity or the acceleration,

It may be the responsibility of the experimenter to determine the value of the dependent variable by some type of measurement

the wavelength of the electromagnetic radiation is\(2.99792458 × 10^-6\)cm.We have the frequency of electromagnetic radiation signal.

We are required to determine the wavelength of this signal in cm.Hertz (Hz) is the unit of frequency. The formula for finding the wavelength of electromagnetic radiation is given by;

wavelength (λ) = speed of light (c) / frequency (f)

Where\(c = 2.99792458 × 10^8 m/sλ\)

= c / f

Given, \(f = 1.00 × 10¹² Hz\)

We have to convert the speed of light to cm/s

Speed of light =\(2.99792458 × 10^8 m/scm\)

\(= 10^-2\) m (conversion factor)

Speed of light\(= 2.99792458 × 10^8 × 10^-2 cm/s\)

\(= 2.99792458 × 10^6 cm/s\)

Now, substitute the values in the formula

λ = c / fλ

\(= (2.99792458 × 10^6 cm/s) / (1.00 × 10¹² Hz)λ\)

\(= 2.99792458 × 10^-6 cm\)

Therefore, the wavelength of the electromagnetic radiation is\(2.99792458 × 10^-6\) cm.

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Answer:

i- testing testing,, 1 2 1 2

Answer:

?

Explanation:

Did it work how you wanted?

Young's modulus is defined as the ratio of the tensile or compressive stress to the longitudinal strain of a body.  Young's modulus of the wire is 1.5 x 10¹¹ N/m².

The symbol for Young's modulus is Y or E, and its unit is N/m² or Pascal (Pa). The formula to calculate Young's modulus is given by:E = (F/A) / (ΔL/L)whereF is the tensile or compressive force appliedA is the cross-sectional area of the wireΔL is the extension or compression of the wireL is the original length of the wireFrom the given question, we have:F = 20 NA = 8 x 10⁻⁷ m²ΔL = 10⁻⁴ mL = 3mSubstituting the given values in the formula of Young's modulus:E = (F/A) / (ΔL/L)E = (20 N / 8 x 10⁻⁷ m²) / (10⁻⁴ m / 3 m)E = (20 N / 8 x 10⁻⁷ m²) x (3 m / 10⁻⁴ m)E = 1.5 x 10¹¹ N/m²Therefore, the Young's modulus of the wire is 1.5 x 10¹¹ N/m².

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Answer:

6.75J

Explanation:

U=1/2KΔx²

U=0.5* 150*0.30^2

\(\large\mathrm{A. Power\:\: will \:\:Increase }\)

We know that,

\(\large \mathrm{ \boxed{P = I²R}}\)

where,

And when resistance is constant, the power of the circuit will change proportionally with the change in electric current. therefore, if current increases then the electric power of the circuit will increase too.

\(\large\mathfrak{{\pmb{\underline{\orange{hope \: \: i t \: \: helps \: \: you}}{\orange{.....}}}}}\)

The correct options based on the information will be:

In regards to this endeavor, a control group is one where variables are retained as a form of comparison against an experimental group that has alterations made.

As such, Group B serves as the untouched element here and remains unaltered in terms of culinarian, crust firmness, topping selection, and cooking duration, while Group A is the subject in question whose variable being tested is the variation in approaches for preparing their pizza (like brick-oven heating versus conventional ovens).

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Answer:

an open circuit (A battery, bulb, wire,switch)

Explanation:

the battery supplies the power the wire carries the current from the battery to the bulb but the circuit is not completed if the switch is not connected (Switch )

Answer:

B

Explanation:

B is the mean position.At the mean position, the velocity of the particle in S.H.M. is maximum and displacement is minimum, that is, x=0. Therefore, K.E. = 1/2 k ( a² – x²) = 1/2 k ( a² – o²) = 1/2 ka². Thus, the maximum kinetic energy is expressed by K.E = ½ ka²

Answer:

Point B is the location of the greatest kinetic energy. This is the point where the pendulum is moving with the greatest velocity.

Explanation:

Rounding to the nearest mile, the estimated distance you can travel is approximately 198 miles.

To estimate the distance you can travel in 4 hours and 50 minutes at an average speed of 41 miles per hour, we need to convert the time to hours.

4 hours and 50 minutes is equivalent to 4.83 hours (since 50 minutes is 50÷60 = 0.83 hours).

Now, we can calculate the distance traveled using the formula: distance = speed × time.

Distance = 41 miles/hour × 4.83 hours

Distance ≈ 198.03 miles

Rounding to the nearest mile, the estimated distance you can travel is approximately 198 miles.

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Answer:

“An object at motion at remains at motion , and an object in motion continues to move with a constant speed and direction unless acted upon by a net external force”.

Explanation:

A ball rolling acroos the field would nevver stop if there was no person, wind, or friction to stop it, simply putting this into scientic word is the answer.

Answer:

An object at rest remains at rest, and an object in motion continues to move with a constant speed and direction unless acted upon by a net external force.

Explanation:

It's Newton's first law of motion, so all I did was add in what I remembered to the blanks. Hope this helps! :)

Answer:

1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity.

Explanation:

A child touches the metal leg of a chair. The temperature of metal leg is moving to her hand.

The temperature is the degree of hotness or coldness when an object is touched.

The metals are generally have less temperature compared to the surrounding temperature. When a child touches the leg of a metal chair, she feel cold, but the physical term is temperature which is moved to her hand.

Thus, temperature of metal leg is moving to her hand.

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Answer:

160

Explanation:

80% x 200 = 160

Because

80% x 100 = 80

80 x 2 = 160

A generator has an efficiency of 80%. When 200 joules of electrical energy is provided by a battery, 160 joules of heat and sound is generated by the generator. Thus option D is correct.

heat is a form of energy which can be spontaneously transferred from one object to another object and it can occur due to the differences in temperatures which is otherwise called as heat transfer.

The Heat transfer occurs until the  equilibrium point of an object occur, another term called  as Temperature which is a  kinetic energy of molecules of a body.

Internal Energy can be represented as the total amount of energy of all the molecules of a body within the object where as Specific Heat or heat capacity can be represented as the amount of energy needed to produce a unit change in its temperature.

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