9. What is the acceleration when a 63 kg person on rollerblades pushes against a wall with a
force of 34 N?

The red glow of a neon sign is due to the excitation of protons in the nuclei of neon atoms is true statement.

Neon is a noble or rare gas that belongs to the periodic table's group 0/8 and period 2 elements. Since there are only two electron shells in its electron orbit and it has an atomic number of 10, it has an 8-valence electron configuration.

The production of a crimson glow of neon, which indicates that protons have left a neon gas's nucleus, occurs when an extremely high voltage is technically given to any electrode that ionises a tube holding neon gas. In conclusion, it may be correctly inferred that a red glow forms when a neon gas is subjected to a high potential of volts.

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Answer:

idk

Explanation:

idk

1.33kg of ice at 0.00 celsius is added to an 8.25kg tub of water at a warmer temperature. If the final temperature is 15. 7 celcius, then the initial temperature of the warmer in the tub was 25.3°C.

We can use the principle of conservation of energy to solve this problem. The energy lost by the ice as it melts is equal to the energy gained by the water as it warms up. The energy lost or gained is given by

Q = mcΔT

Where Q is the energy lost or gained, m is the mass of the substance, c is its specific heat capacity, and ΔT is the change in temperature.

First, let's calculate the energy gained by the water

Qwater = (8.25 kg)(4.18 J/(g·°C))(15.7°C - ti)

Where we have used the specific heat capacity of water, which is 4.18 J/(g·°C).

Next, let's calculate the energy lost by the ice

Qice = (1.33 kg)(334 J/g)

Where we have used the heat of fusion of ice, which is 334 J/g.

Since the ice melts at 0°C, we can set the energy lost by the ice equal to the energy gained by the water

Qice = Qwater

(1.33 kg)(334 J/g) = (8.25 kg)(4.18 J/(g·°C))(15.7°C - ti)

Solving for ti, we get

ti = 25.3°C

Therefore, the initial temperature of the warmer in the tub was 25.3°C.

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The definition of frequency, expressed in hertz, is the number of oscillations of a wave per unit of time (Hz). The relationship between frequency and pitch is straightforward. Frequencies between 20 and 20000 Hz are audible to humans.

The number of wave cycles or revolutions per second is known as frequency. The following is the frequency-based formula for period (T): If wavelength and velocity are taken into account for any wave, the Frequency Formula is expressed as. f = v λ

he relationship between these two factors is justified by the fact that the speed at which a wave travels is equal to the product of its frequency and wavelength.

V=fλ

f represent frequency

V= speed

λ = wavelength

by using this formula

λ = v/ f = 2nm

Therefore, 2nm is the wavelength of the wave.

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The focal length of the mirror will be 0.33 m

Focus is defined as the point through which the reflected light rays pass (or appear to pass) when incident light rays are parallel to the principal axis. It is located at the midpoint of pole and center of curvature. The distance between the pole and the focus of the mirror is called the focal length of the mirror.

F =2R or focal length of a mirror is half of its radius of curvature.

The radius of curvature of convex or concave mirror is equal to two times of the focal length of convex or concave mirror. The radius of curvature is the radius of sphere formed by the convex or concave mirror. It is also equal to the distance between the pole and center of curvature.

F = 1/R

R = 3 m (given )

F = 1 / 3 = 0.33 m

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The distance between first airplane and second airplane after 1.8 hours of their departure is 1598.22 meters.

The cosine formula for vector addition is -

|R|² = |A|² + |B|² + 2AB cosφ

Where - φ is the angle between vectors A and B.

Given is two airplanes that leave the airport at same time. The velocity of the first airplane is 690 m/h at a heading of 68.5°. The velocity of the second airplane is 590 m/h at a heading of 156°.

The length of the position vector of first airplane →

|OA| = velocity x time = 690 x 1.8 = 1242 miles.

The length of the position vector of second airplane →

|OB| = velocity x time = 590 x 1.8 = 1062 miles

Angle between vectors OA and OB →

φ = 156° - 68.5° = 87.5°

In the triangle ΔOAB, using the triangle law of vector addition, we get →

OA + AB = OB

AB = OB - OA

AB = OB + (- OA)

Now, using the formula for resultant of addition of two vectors →

AB² = (OB)² + (- OA)² + 2(OA)(- OB) cosφ

AB² = OB² + OA² + - 2(OA)(OB)cosφ

AB² = 11,27,844 + 15,42,564 - 2 x 1242 x 1062 x cos(87.5°)

AB² = 11,27,844 + 15,42,564 - 2 x 1242 x 1062 x 0.044

AB² = 26,70,408 - 1,16,072.352 = 25,54,335.648

AB = √25,54,335.648

AB = 1598.22 meters

Hence, the distance between first airplane and second airplane after 1.8 hours of their departure is 1598.22 meters.

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In the modified Atwood machine shown in Figure 13.11, the two weights on the left have equal masses m and are connected by a massless spring of force constant k. The weight on the right has mass M = 2m, and the pulley is massless and frictionless. The coordinate x is the extension of the spring from its equilibrium length. We need to find the total potential energy of the system.

Let us first consider the potential energy of the spring. The potential energy of a spring is given by the equation U = 1/2 kx^2, where k is the force constant of the spring, and x is the displacement of the spring from its equilibrium position. In this case, the extension of the spring is x, so the potential energy of the spring is U_spring = 1/2 kx^2.

Next, we need to consider the gravitational potential energy of the weights. The gravitational potential energy of an object of mass m at a height h above the ground is given by U_gravity = mgh, where g is the acceleration due to gravity and h is the height of the object above the ground. In this case, the height difference between the two masses on the left and the mass on the right is l - x, so the potential energy of the left weights is U_left = 2mgl - 2mgx.

The mass on the right has a height of zero, so its gravitational potential energy is U_right = 0.

Therefore, the total potential energy of the system is given by U_total = U_spring + U_left + U_right = 1/2 kx^2 + 2mgl - 2mgx.

In conclusion, we have derived an expression for the total potential energy of the modified Atwood machine. This expression shows that the potential energy of the system is dependent on the extension of the spring, the acceleration due to gravity, and the masses of the weights.

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Answer:

The mass of air in the room is 91.68 kg.

Explanation:

In order to find the mass of air in the room, given that the volume of the air is 76.4 m³ and its density is 1.2 kg/m³, we can use the following formula:

\(\boxed{\mathrm {Mass = Density \times Volume}}\)

Substituting the given values into the equation, we get:

\(\mathrm{Mass = 1.2 \: kg/m^3 \times 76.4 \: m^3}\)

        \(= \bf 91.68 \: \mathrm{\bf kg}\)

We have that this is an exercise on the density of liquids and gases.

We have that your data is:

To calculate the mass. We multiply the density by the volume. Therefore, we apply the following formula:

m = d·v

We substitute our data in the formula and solve

m = (1.2 kg/m³)·(76.4 m³)

m = 91.7 kg

Therefore, the mass of air in the room is 91.7 kg.

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The melting point of a substance is the temperature at which the substance changes its phase from solid to liquid.

The freezing point is the temperature at which the substance changes its phase from liquid to solid.

The melting point of a substance is the same as the freezing point. That is when the temperature of the substance in the liquid form is increased continuously, the temperature at which the substance turns into a solid is equal to the temperature at which the substance will turn into liquid from solid if the temperature is decreased continuously, from a higher temperature.

Answer:

wat

Explanation:

Answer:

B. The law of conservation of energy

Explanation:

The law of conservation of energy states that energy can neither be created or destroyed which means that a perpetual motion machine, which creates its own power and energy, cannot be true since energy cannot be created.

Answer:

The candle stick flame will burn brighter.

Explanation:

I majored in Physics.

As n is not an integer, so there will be no constructive interference between the speakers, if speaker A is moved by minimum distance.

Interference is a phenomenon in which two waves combine by adding  displacement together at every single point in space and time and to form a resultant wave of greater, lower, or same amplitude.

Wavelength of a 500 Hz sound wave is the speed of sound (about 343 m/s) divided by the frequency of the sound, which is 343/500 m = 0.686 m. Therefore, minimum distance you can move speaker A to achieve constructive interference along x-axis is 0.686/2 m = 0.343 m.

Given, distance between the speakers is 6m. Constructive interference will occur when path difference between two waves is equal to integer multiple of the wavelength. To achieve constructive interference, distance between the speakers + the distance moved by speaker A should be equal to n*wavelength where n is integer.

So, 6 + 0.343 = n* 0.686

n = (6+0.343)/0.686 = 8.8

As n is not an integer, so there will be no constructive interference between the speakers, if speaker A is moved by minimum distance.

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Mars appears to be moving backward in its orbit during the month of Mars.What is the phenomenon of planets moving backward called?The phenomenon of planets moving backward is referred to as retrograde motion. Mars is visible from Earth, and its motion is affected by Earth's orbit around the sun.

During the time that Earth overtakes Mars in orbit, Mars appears to be moving backward in its orbit.The orbit of Mars around the sun is relatively slow, taking about 687 Earth days to complete one orbit. During this time, Mars completes a revolution in the opposite direction of Earth's rotation around the sun. Because of Earth's orbital path around the sun, it sometimes overtakes Mars in orbit.

It's important to note that Mars does not actually move backward, but it appears to do so because of the difference in orbital speeds between Earth and Mars.The movement of Mars backward in its orbit is a natural phenomenon caused by the difference in orbital speeds between Earth and Mars. Mars appears to move backward in its orbit during the month of Mars. During this time, Mars appears to move backward for about 72 days before resuming its forward motion again.

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Answer:

Displacement = 1725m

Explanation:

\(t = \frac{u-v}{a}\)

\(t = \frac{65-50}{0.5} = 30s\)

\(s = ut+\frac{1}{2}at^{2} \\s = 50*30 + \frac{1}{2} *0.5*30^{2} = 1725m\)

Answer:

B. Chlorine (CI)

Explanation:

I GUESS I DON'T NEED TO GIVE THE EXPLANATION. CAN I GET SOME REWARDS PLEASE....

THE ANSWER IS: B. Chlorine (CI)

Yes. If the smaller force is farther from the fulcrum than the larger mass.

A body that does not deform or alter shape is idealized as a hard body. Formally, it is described as a group of particles with the feature that their distance from one another does not change as the body moves.

When an engine exerts itself, torque, which is a twisting force, speaks to the rotational force of the engine and quantifies how much of that twisting force is accessible. Everyday activities like turning a doorknob, opening a drink bottle, using a wrench, or peddling a bicycle all involve torque.

The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.

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Answer:

t = 1.5 hours

Explanation:

Given that,

Speed of an airplane, v = 560 miles per hour

Distance, d = 840 miles

We need to find the time taken to cover a distance of 840 miles.

\(v=\drac{d}{t}\\\\t=\dfrac{d}{v}\\\\t=\dfrac{840}{560}\\\\t=1.5\ h\)

So, the required time is 1.5 hours.

Using the buildup of electric charges on two neighbouring surfaces that are electrically insulated from one another, a capacitor is a device that stores electrical energy in an electric field. It is an electrical passive component with two terminals. Capacitance is the measurement of a capacitor's effect.

C = ∈oA / d = (8.85 * 10⁻¹² * 0.0178) / (0.35 * 10⁻³)

                  = 4.5 * 10⁻¹⁰ F

Q = C*V = (4.5 * 10⁻¹⁰ * 27)

            = 1.215 * 10⁻⁸ C

E = V / d = 27 / (0.35 * 10⁻³)

              = 7.71 * 10⁴ N/C

An electrical energy storage device called a capacitor is made up of two conductors that are situated close to and insulated from one another. A parallel-plate capacitor serves as an easy-to-understand illustration of one such storage device.

In contrast to a battery, a capacitor is a part of a circuit that uses a potential difference created by charged particles distributed between (typically two) plates to temporarily store electrical energy. A capacitor may charge more quickly than a battery and can quickly release all of its stored energy.

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Answer:

2.3 x 10-13 F

Explanation:

From the question,

Applying

C = e₁e₂A/d..................... Equation 1

Where C = Capacitance of the capacitor, d = distance of seperation, A = cross sectional area of the capacitor, e₁ = permitivity of free space, e₂ = relative permitivity of vacuum.

But,

Area of a circle (A) is given as

A = πr²................... Equation 2

Where r = radius of the capacitor.

Substitute equation 2 into equation 1

C = e₁e₂πr²/d............... Equation 3

Given: r = 2.5 mm = 0.0025 m, d = 0.75 mm = 0.00075 m

Constant; e₁ = 8.85×10⁻¹² F/m, e₂ = 1 F/m, π = 3.14.

Substitute these values into equation 3

C =  [(8.85×10⁻¹²)(1)( 0.0025²)(3.14)]/(0.00075)

C = 0.23×10⁻¹²

C = 2.3×10⁻¹³ F

Answer:

A

Explanation:

edge

Answer:

800mph

Explanation:

To make 4 amperes flow through a resistance of 20 ohms, 80 volts of voltage are required.

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. In other words, the greater the voltage, the greater the current that flows through a given resistance.

The voltage required to make 4 amperes flow through a resistance of 20 ohms can be calculated using Ohm's law:

Voltage (V) = Current (I) x Resistance (R)

Therefore, V = 4 A x 20 Ω = 80 V

So, to make 4 amps flow through a resistance of 20 ohms, 80 volts of electricity are required.

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The trip takes a total of 1.5 hours and has an average speed of 40 mph.

To calculate the time taken for each leg of the trip, we can use the formula time = distance/speed.

For the first leg of the trip, the car travels 15 miles at a speed of 45 mph. Using the formula, we find that the time taken for this leg is 15/45 = 0.33 hours.

For the second leg of the trip, the car travels another 15 miles but at a speed of 30 mph. Using the formula, we find that the time taken for this leg is 15/30 = 0.5 hours.

To find the total time for the trip, we add the times for each leg: 0.33 hours + 0.5 hours = 0.83 hours.

To calculate the average speed for the entire trip, we use the formula average speed = total distance/total time. The total distance traveled is 15 miles + 15 miles = 30 miles. The total time taken is 0.83 hours. Plugging these values into the formula, we find that the average speed for the trip is 30/0.83 = 36.14 mph.

Therefore, the trip takes a total of 1.5 hours and has an average speed of 40 mph.

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the answer is (c) i think

Answer:

alot of both

Explanation:

hfhsjsbshdjfhsbshfif

Two negatively charged objects are 2 meters apart. the student adds electrons through conduction to one of the objects, then the force of repulsion between the two objects will decrease.

The reason for this is that the negatively charged electrons on the first object will repel the negatively charged electrons on the second object, creating a force of repulsion between them. Adding electrons to one of the objects will increase the number of electrons on that object, resulting in a stronger negative charge. This increase in the negative charge on one object will make it more difficult for the electrons on the other object to push against it, reducing the force of repulsion between the two objects. It's important to note that the amount of decrease in the force of repulsion will depend on the amount of electrons added and the initial charge of the objects. Also, If the distance between the two objects does not change and the charges on the objects are not affected by other factors, the electrostatic force of repulsion between the objects will be inversely proportional to the square of the distance between them.

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Question - Two negatively charged objects are 2 meters apart. The student adds electrons through conduction to one of the objects. What is the force of repulsion between the two objects?

Given information: The average method reports the following unit data for the forming department. Units completed in the forming department are transferred to the painting department. Production cost information for the forming department follows.

Direct materials:
Units completed during the period = 45,000 units
Ending work in process inventory = 5,000 units
Direct materials cost = $202,500

Conversion costs:
Units completed during the period = 45,000 units
Ending work in process inventory = 5,000 units
Conversion cost = $189,000

a. Calculation of equivalent units of production for both direct materials and conversion for the forming department:
Equivalent units of production = Units completed during the period + (Ending work in process inventory * Degree of completion)
Direct materials:
Equivalent units of production = 45,000 + (5,000 * 50%) = 47,500 units

Conversion costs:
Equivalent units of production = 45,000 + (5,000 * 60%) = 48,000 units

b. Calculation of the cost per equivalent unit of production for both direct materials and conversion for the forming department:
Cost per equivalent unit of production = Total cost for the period / Equivalent units of production

Direct materials:
Cost per equivalent unit of production = $202,500 / 47,500 units = $4.26 per unit

Conversion costs:
Cost per equivalent unit of production = $189,000 / 48,000 units = $3.94 per unit

c. Calculation of the cost assigned to the forming department's output using the weighted average method:
Total cost = Cost of units transferred out + Cost of ending work in process inventory
Cost of units transferred out = Number of units transferred out * Cost per equivalent unit of production
Cost of ending work in process inventory = Number of units in ending work in process inventory * Cost per equivalent unit of production

Direct materials:
Cost of units transferred out = 40,000 * $4.26 per unit = $170,400
Cost of ending work in process inventory = 5,000 * $4.26 per unit = $21,300
Total cost = $170,400 + $21,300 = $191,700

Conversion costs:
Cost of units transferred out = 40,000 * $3.94 per unit = $157,600
Cost of ending work in process inventory = 5,000 * $3.94 per unit = $19,700
Total cost = $157,600 + $19,700 = $177,300

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Answer:

The velocity of the nickel just before it hits the ground is approximately 49.3 m/s

Explanation:

In order to calculate the velocity of the nickel just before it hits the ground, we recall the kinematic equation of motion, v² = u² + 2·g·h, where the variables of the equation are defined as follows;

v = The velocity of the nickel just before it hits the ground after it is pushed off the observation deck

u = The initial velocity of the nickel just before it is pushed off the observation deck = 0 m/s

g = The acceleration due to gravity = 9.8 m/s²

h = The height from which he nickel is pushed off the edge = 124 m

Substituting the given values and the constant, "g", we have;

v² = 0² + 2 × 9.8 × 124 = 2,430.4

v = √2,430.4

Using a graphing calculator, we have;

v = √2,430.4 = 14·√(62/5) ≈ 49.3

The velocity of the nickel just before it hits the ground = v ≈ 49.3 m/s.

Answer:

the first on the left goes with the 3rd on the right

second left last right

3rd goes with 1st

4th goes with 5th

5th goes with 4th

and last but not least 6th goes with the second

Explanation: