A volleyball that has an initial momentum of -1.0 kg · m/s changes direction after a hand hits it with a force of 150 N for 0.01 seconds.

The net force acting on a given layer is the sum of the forces exerted by the layers above and below it.

The acceleration of the given layer is then determined by this net force, as well as the mass of the layer.

The acceleration of the layer will be in the same direction as the net force, and the magnitude of the acceleration will be proportional to the magnitude of the net force divided by the mass.

what is net force?

Net force is the vector sum of all forces acting on an object. It is the total amount of force being applied to an object and is calculated by adding all the individual forces together.

Therefore, The net force acting on a given layer is the sum of the forces exerted by the layers above and below it.

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The emission spectrum of this system will contain four different wavelengths, corresponding to each of the allowed energies.

Wavelength is a measure of the distance between two consecutive wave crests or troughs and is usually defined as the length of one full cycle of a wave. Wavelengths are typically measured in meters, centimeters, or nanometers (10-9 meters). Wavelength is inversely related to frequency, meaning that higher frequency waves have shorter wavelengths.

The wavelength of each energy level can be calculated using the equation λ = hc/E, where h is Planck's constant, c is the speed of light, and E is the energy level in electron volts. Using this equation, the four wavelengths of the emission spectrum are calculated as follows: 0.0 eV = 0.0 m, 1.5 eV = 8.0 x 10^-7 m, 3.0 eV = 4.0 x 10^-7 m and 6.0 eV = 2.0 x 10^-7 m. Thus, the emission spectrum of this system will contain four different wavelengths, which can be identified by their corresponding energy levels.

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The graph V as a function of r determines the potential of charge at different radius. This instructs how to estimate the charge-related electric field strength.

There won't be any net charge within the Gaussian surface if we suppose any imaginary sphere inside the charged sphere. So, Σq = 0 . So, the net flux is equal to 0. Consequently, a hollow sphere has no electric field inside of it.

The entire charge will be on the periphery of a conducting hollow sphere, and the electric field strength within the conducting sphere will be zero. The entire charge will reside on the shell's outside in the case of a spherical shell, and there will be no interior field as well.

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Gold ornaments look new even after several years because gold is a very stable metal and does not corrode or tarnish easily. It is also a very soft metal, which means that it does not scratch easily.

The shiny appearance of gold is due to its metallic luster, which is maintained even after many years.

Additionally, gold does not react with most chemicals, so it does not discolor or degrade over time. This means that gold ornaments can retain their original appearance for a long time.

The current in the heating element is 17.08 A, and 12-gauge wire is sufficient to supply this current.  The resistance of the dryer's heating element at its operating temperature is 14.08 Ω.At 11 cents per kWh, it costs 0.41 cents per hour to operate the dryer.

Current is the flow of electric charge, usually through a conductor such as a wire. It is measured in amperes (A). Current is a measure of the rate of flow of electric charge, and can be direct (DC) or alternating (AC). In AC, the current regularly switches direction, making it ideal for powering most electrical equipment.

The current in the heating element is 4.1 kW/240 V = 17.1 A. 12-gauge wire is large enough to supply this current, as it can handle up to 20 A.

(b) The resistance of the dryer's heating element at its operating temperature can be calculated using Ohm's Law. R = V/I = 240 V/17.1 A = 14.03 Ω.

(c) The cost per hour to operate the dryer is 11 cents/kWh x 4.1 kW = 45.1 cents.

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Answer:

1. Pulley System - Pulleys can be used to effectively transfer force, change the direction of a force and/or increase the power of a force. This can be used to teach the students how basic machines can be used to help in everyday life.

2. Lever System - Levers can be used to teach students about how their daily tasks can be made easier using a machine. It also helps illustrate the law of the lever.

3. Wheel and Axle - This machine allows students to learn how a wheel and axle can increase the torque or rotational force on an object thus allowing heavy loads to be moved with less effort.

4. Inclined Plane - This machine teaches students about how even large objects can be moved with a ramp as its sloped shape reduces the force needed to move objects.

5. Screw -The screw allows students to learn how force is transferred from one point to another. It also introduces them to concepts such as rotational force and torque.

The magnitude of the impulse delivered to your roof is 1.134 x 10⁻⁵ kg.m/s. The magnitude of the average force of the impact is 0.0307 N.

If the force is constant, the impulse of force is created by multiplying the resultant force, F, by the length of this force, t. The impulse of force is what changes the state of motion, which then changes the state of momentum.

a sudden, unplanned tendency for or invitation to certain frequently unreasonable behavior. a predisposition or innate tendency that is frequently irrational. a pulse of excitement that moves through tissues, especially muscles and nerve fibers, and, by observing nerve signals, either stimulates or inhibits physiological action.

Given;

Mass of the raindrop, m = 0.0014 g = 0.0014 x 10⁻³ kg

Speed of the rain, v = 8.1 m/s

Time of motion, t = 0.37 ms

(a) The impulse delivered to the roof is calculated as;

J = ΔP = mv

[tex]J=(0.0014*10^-3)*(8.1)\\J=1.134*10^-5 kg.m/s[/tex]

(b) The magnitude of the force of impact is calculated by applying Newton's second law of motion,

F = ma

[tex]F=\frac{mv}{t}[/tex]

[tex]F=\frac{(0.0014*10^-3)(8.1)}{0.37*10^-3} \\F=0.0307N[/tex]

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The kinetic energy acquired by the nail is: 91.5 J.

Kinetic energy is a form of energy that is associated with the motion of an object. It is the energy of a body or a system due to its motion. It is represented by the symbol K and is calculated by multiplying half of the object's mass with its velocity squared. Kinetic energy is always greater than zero and is equal to the amount of work needed to accelerate the body from its initial velocity to its final velocity.

The kinetic energy acquired by the nail when it is struck by the hammer can be estimated using the equation
KE = (1/2) mv^2
where m is the mass of the nail and v is the speed of the hammer.
In this case, m = 11.5 g and v = 4.36 m/s.
Therefore, the kinetic energy acquired by the nail is:
KE = (1/2) * 11.5 g * (4.36 m/s)^2
= 91.5 J.

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The  work is done by each of the ropes and gravity are 6375 Joules and 12750 Joules respectively during lowering the piano.

The mass of piano that has to be lift up is 255 kg.

The ropes has to lower the piano till height of 5 M from a second story window to the ground.

The work done during lowering the piano should be,

W = MgH

W is work done,

M is the mass,

g is the gravitational acceleration,

H is the height.

Putting values,

W = 255×10×5

W = 12750 Joules.

The work done by each rope will be 6375 Joules.

The work done by gravitation force will be 12750 Joules.

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The cosine and sine functions of y(4) are, respectively, 0.033 and 0.042 when A = 0.75. Maximum particle movement is the definition of a sound wave's amplitude.

A sound wave's frequency is determined by how many vibrations it makes per second. 2016-08-05. Accessed 30 June 2022. A sound wave's amplitude can be used to measure its height. A wave is an energetic perturbation of a medium without net particle motion. Elastic deformation, changes in pressure, alterations in the strength of the electric or magnetic fields, modifications in the electric potential, or adjustments in temperature could all be signs of it. The cosine and sine functions of y(4) are, respectively, 0.033 and 0.042 when A = 0.75.

Y(4) = 0.75SIN(4*PI/5), which is 0.75(0.044) = 0.033, is the equation.

The formula for Y(4) is 0.75COS (PI/4*4) = 0.75(0.044) = 0.042.

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The number of protons than electrons is 1.74 x 10^19.

A subatomic particle is the proton. The proton has a positive charge, or +1e elementary charge. The mass of a proton is slightly less than that of a neutron.

The units kg, MeV/c, and u can be used to calculate proton mass (AMU).

The net charge of an object is equal to the number of protons minus the number of electrons.

If the net charge of the piece of plastic is 1.74 coulombs, that means that the number of protons is greater than the number of electrons by 1.74 coulombs.

To find the number of protons or electrons, you would need to know the elementary charge, which is the charge of a proton or electron, which is 1.60 x 10^-19 C.

Therefore, the number of protons - number of electrons = 1.74 C / 1.60 x 10^-19 C/proton = 1.74 x 10^19 protons - electrons.

So, the number of protons than electrons is 1.74 x 10^19.

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To separate the plates in a capacitor, they are charged with the opposite polarity. The stored charges on the capacitor drop as the plates separate as the capacitor's capacity to hold charges decreases.

Motion (kinetic energy) and stored mechanical energy are the two forms (potential energy). Our guide that describes potential and kinetic energy has further information. The amount of potential energy determines how mechanical conversion works.

The work is positive if an object is subjected to an applied force and moves in the same direction. If an object experiences force and then moves in the opposite direction,

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(a) The wavelength of the whale's echolocation wave is 1.66 x 10⁻³ m.

(b) The time taken for the reflected sound wave to return is 0.6 second.

The wavelength of the whale's echolocation wave is calculated by applying  the relationship between the speed of sound, wavelength and frequency of sound.

Mathematically, the formula is given as;

v = fλ

where;

λ = v / f

λ = ( 331 ) / ( 200,000 )

λ = 1.66 x 10⁻³ m

The time taken for the reflected sound wave to return is calculated as follows;

v = ( 2d ) / t

t = ( 2d ) / ( v )

where;

t = ( 2 x 100 m ) / ( 331 m/s )

t = 0.6 second

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The force from the motorbike's engine is equal to the mass multiplied by the acceleration, or 220 kg x 5 m/s² = 1,100 N.

What is mass ?

Mass is the amount of matter or material in an object. It is measured in kilograms (kg) or pounds (lbs). Mass is different from weight, which is the measure of the force of gravity on an object. Mass is a property of an object that is independent of its location in space, whereas weight is a measure of the force of gravity on an object and therefore is dependent on its location.

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Its velocity (in m/s) just before it strikes the floor is - 5.42 m/s.

The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the magnitude of velocity can be expressed in centimeters per second (cm/s).

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.

Given,

height = 1.50m

rebound height = 1.00m

Using the equation of motion,

v² = u² - 2as

⇒ v = - √(u² + 2(-9.81 m/s² × - 1.50m))

⇒v = - 5.42 m/s

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Answer:

KE = (1/2)mv^(2) = (1/2)1500(7^(2)) = 36750J

Explanation:

To determine the kinetic energy of the car, we need to use the formula for kinetic energy. The formula is KE=(1/2)mv^(2) where m is the mass of the object (in kg) and v is the speed of the object (in meters per second, which is often written as (m/s)).

In the case we are looking at, our object is the car, the mass, m = 1500kg and the speed, v = 7m/s. Plugging these values into the formula for kinetic energy and using our calculator we get the following:

KE = (1/2)mv^(2) = (1/2)1500(7^(2)) = 36750J

The resistance of a 1500 watt (120 volt) hair dryer is 12 ohms.

Resistance is an opposition or a refusal to accept or comply with something. It is the ability to withstand or overcome something, such as an opposing force or influence. Resistance can also refer to a process of gradual change or transformation over time. Resistance is often seen in the form of protests, civil disobedience, or other forms of dissent. Resistance can also refer to the refusal to accept something as true or valid, such as a political or social ideology.

This can be determined by using Ohm’s Law, which states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, if the voltage is 120 volts and the wattage is 1500 watts, the resistance can be calculated as follows: R = V/I = 120/1500 = 0.08, or 12 ohms.

It is important to note that the above calculation only applies to a hair dryer that runs on direct current (DC). If the hair dryer is running on alternating current (AC), the resistance may be slightly different. The resistance of an AC-powered hair dryer can be determined by measuring the current and voltage with a multimeter.

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Yes ,the net electric charge of an isolated system does not change.

A quality of matter known as a charge causes it to produce and experience electrical and magnetic phenomena. The fundamental tenet of charge conservation is that the system's overall charge is conserved.

As we all know, a system is a collection of things, and the interactions between charges and energy and momentum are comparable. However, this conservation rule makes more sense because an object's net charge depends on the quantity of electrons and protons present. Protons and electrons cannot suddenly arrive or vanish, and the overall charge must remain constant. This explains why a body always contains the same number of protons and electrons.

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The second harmonic frequency of this pitch is 620 Hz.

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity and is distinct from angular frequency.

Frequency is measured in hertz (Hz) which is equal to one event per second.

The fundamental frequency of a pipe is determined by the length of the pipe. The frequency of the second harmonic, also known as the first overtone, is twice the fundamental frequency.

So, if the fundamental frequency of the flute is 310 Hz, the second harmonic frequency would be 2 * 310 Hz = 620 Hz.

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Minimum height  is approximately 0.35 meter to experience sufficient force to break.

Let's use the following equation to calculate the glass figure's acceleration.

F = m * a

-712 = 3.8 * a

a = -712 ÷ 3.8

This is equivalent to -187 m/s2. Let's use the equation below to calculate the glass figure's speed shortly before the force was applied.

vf = vi + a*t

0 = vi + (-712 ÷ 3.8) * 0.014

vi = (712 ÷ 3.8) * 0.014

This is equivalent to 2.62 m/s. Let's use the equation below to calculate how far the glass figure must fall for it to reach this velocity.

Vi = 0 m/s, and vf2 = vi + 2 * g + d

[(712 ÷ 3.8) * 0.014]^2 = 2 * 9.8 * d

d = [(712 ÷ 3.8) * 0.014]^2 ÷ 19.6

This is approximately 0.35 meter.

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The three experimental factors that might have contributed to the percent difference between fg and fc are radius, speed and weight.

The centripetal force holding mass m1 in a horizontal circular orbit is equal to the weight of the hanging mass. When an object is moving at a certain speed, its weight exerts a force on it that causes the required centripetal acceleration; the track exerts no force on the object at all.

The downward pull of gravity and the upward tension force are the only two forces that the hanging mass (m2) is subject to. The centripetal acceleration of an item is independent of mass; as a result, the centripetal acceleration is unaffected by changes in mass.

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Answer:

Explanation:

a) The final kinetic energy of the car is equal to the work done in accelerating the car from rest to a speed of 30ms^-1. Therefore, the final kinetic energy of the car is equal to:

KE = ½ mv^2 = ½(1000kg)(30ms^-1)^2 = 450,000 J

b) The power of the car can be calculated by dividing the work done by the time taken for the acceleration. Therefore, the power of the car is equal to:

Power = Work/Time = 450,000 J/12s = 37,500 W

c) The electrical current flowing from the battery can be calculated by dividing the power by the voltage of the battery. Therefore, the electrical current flowing from the battery is equal to:

Current = Power/Voltage = 37,500 W/300V = 125 A

Assumptions:

1. The car is assumed to be moving in a straight line with no friction.

2. The batteries are assumed to be wired correctly and in good condition.

3. The car is assumed to have a constant acceleration over the 12s period.

4. The voltage of the battery is assumed to remain constant over the 12s period.

Answer:

Explanation: the kinetic energy k=1/2mv^2
K=8m
using formula
8=1/2mv^^2
v^2=16
v=4m/s

Answer:

Explanation:

m = 4.0 kg

v = 2.0 m/s

g = 10 m/s²

Mechanical energy of the pendulum = 68.0 J

Mechanical energy of the pendulum  = Potential energy of the pendulum  + Kinetic energy of the pendulum

mgh + 1/2 mv² = 68

4 × 10 × h + 1/2 × 4 × 2 × 2 = 68

40 h + 8 = 68

40 h = 68-8

40 h = 60

h = 60 / 40

h = 3/2 m

h = 1.5 m

Answer: A

Explanation: This is a condition that makes it hard for the body to obsorve oxygen.

Answer:

it's A

Explanation:

i just did the same thing

The final velocity of the two vehicles as they move as a single mass is 18.42 m/s.

The total momentum of the two vehicles before the collision is:

momentum_initial = mass_suv ×velocity_suv + mass_car × velocity_car

The total momentum of the two vehicles after the collision is:

momentum_final = (mass_suv + mass_car) ×velocity_final

Since momentum is conserved, the initial momentum is equal to the final momentum:

momentum_initial = momentum_final

mass_suv × velocity_suv + mass_car × velocity_car = (mass_suv + mass_car) ×velocity_final

By substituting the given values, we can solve for the final velocity_final:

1217 kg * 20.8 m/s + 1087 kg * 14 m/s = (1217 kg + 1087 kg) * velocity_final

velocity_final = (1217 kg * 20.8 m/s + 1087 kg * 14 m/s) / (1217 kg + 1087 kg)

velocity_final = 18.42 m/s

The final velocity of the two vehicles as they move as a single mass is 18.42 m/s.

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The mass flow of ammonium-n passed by any point in the lake after the two sources have become mixed depends on the combined rate of release from the sources.

What is the mass ?

The amount of matter that makes up a thing is measured by its mass.. It is typically measured in kilograms or grams and is an important quantity in physics and chemistry. Mass is different from weight, which is a measure of the force of gravity on an object. Mass is an intrinsic property of an object, meaning it is independent of the object's environment. Mass is conserved, meaning it cannot be created or destroyed, only changed through physical or chemical reactions.

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The force exerted by the water on the wall will be equal to 160 N. Newton's third law of motion is seen taking place here.

The force exerted by the water on the wall is calculated using the impulse-momentum principle. The principle states that the change in momentum of an object is equal to the impulse, or the force applied over a certain period of time. In this case, the change in momentum is equal to the initial momentum of the water (mass flow rate multiplied by velocity) minus the final momentum of the water (mass flow rate multiplied by final velocity) and the time is assumed to be very small.

The assumptions made in the calculation of force exerted by the water on the wall are:

The water hits the garage instantaneously.

The water flow rate is constant and no water is lost during the impact.

The water hits the garage uniformly over the entire area and not just at one point.

The garage door is not moving before the impact. These assumptions are made to simplify the calculation and to make it more accurate. It is important to note that in real-world scenarios, these assumptions may not always hold true and the force exerted by the water on the wall may be different.

Force exerted by the wall on the water, F = dP/dt

= (P2 - P1)/dt

= dm*(V2 - V1)/dt

= (V2 - V1) x dm/dt

= (0 - 16) x 10

= -160 N (negative sign indicates force opposes the motion)

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When a stone is propelled vertically off the ground its kinetic energy decreases and gravitational potential energy increases.

When an object is propelled upwards at first it have the highest kinetic energy. The total energy will be equal to kinetic energy and potential energy will be 0. When it reaches midway through the air, the kinetic energy gradually decreases and potential energy increases, because some of the kinetic energy is converted to gravitational potential energy.

When the object reaches the maximum height, the Kinetic energy will become 0, and object stops moving forward. Here all the kinetic energy i converted to gravitational potential energy. Potential energy will be maximum at this point. After this the object begins to fall attaining some kinetic energy.

So when an object is thrown vertically upwards, the kinetic energy decreases and gravitational energy increases. The total energy will remain constant throughout.

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The total energy will be 125,000 J. The total energy is sum of kinetic energy and potential energy.

We use the (joking) example of trying to roast a turkey using potential energy to help us develop an intuitive understanding of the relative magnitudes of the various kinds of energy.

A 100 m building (about 30 floors) is used, and the turkey is carried to the top before being thrown from the edge. Thus, the potential energy is transformed into kinetic energy, which is then transformed into internal energy upon collision.

A rise in temperature is a representation of an increase in internal energy, and if this experiment is carried out frequently enough, the turkey should be able to cook as a result.

Therefore, The total energy will be 125,000 J. The total energy is sum of kinetic energy and potential energy.

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