A horizontal 790-N merry-go-round of radius 1.60 m is started from rest by a constant horizontal force of 45 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 4.0 s. (Assume it is a solid cylinder. Also assume the force is applied at the outside edge.)

Answer:

\({ \sf{F=Ee}}\)

Explanation:

F » Force

E » Electric field intensity

e » magnitude of charge

Third one. It will increase the number of frequencies that satellites can use to communicate with Earth.

It will increase the number of frequencies that satellites can use to communicate with Earth. The correct option is C.

Satellite communication is the utilization of artificial satellites to give communication links among various points on Earth in telecommunications.

Satellite communications are critical components of the global telecommunications system.

Satellites communicate by sending signals to Earth's antennas via radio waves. The antennas then capture those signals and process the information they contain.

Satellites collect data on the Earth's clouds, oceans, land, and air. They can also see wildfires, volcanoes, and smoke.

All of this data assists scientists in forecasting weather and climate. It assists farmers in determining which crops to plant.

When severe solar weather continues for an extended period of time, it increases the number of frequencies that satellites can use to communicate with Earth.

Thus, the correct option is C.

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Answer:

A) E_min = 36.21 × 10^(-20) J

B) 549 nm

Explanation:

A) The formula for energy of a photon is given as;

E = hc / λ

Where;

h is Planck's constant = 6.626 x 10^(-34) J.s

c is the speed of light = 3 × 10^(8) m/s

λ is wavelength

Wavelength is given as; 540 nm = 540 × 10^(-9) m

Thus;

E = (6.626 × 10^(-34) × 3 × 10^(8))/(540 × 10^(-9))

E = 36.81 × 10^(-20) J

We are given kinetic energy as;2.60 x 10^(-20) J

Now formula for E_min is;

E_min = E - K.E

E_min = (36.81 × 10^(-20)) - (2.60 x 10^(-20))

E_min = 36.21 × 10^(-20) J

B) the longest wavelength, in nanometers, that will eject electrons from cesium would have an energy that would be equal to E_min.

Thus,

36.21 × 10^(-20) = (6.626 × 10^(-34) × 3 × 10^(8))/λ

Making λ the subject gives;

λ = (6.626 × 10^(-34) × 3 × 10^(8))/36.21 × 10^(-20) = 549 x 10(-9) = 549 nm

The minimum energy of the electron is \(E_{min} = 34.2 \times 10^{(-20)} \;\rm J.\)

The longest wavelength of the electron is 549 nm.

Given that, in the photoelectric effect, electrons are ejected from a metal surface when light strikes it. A certain minimum energy, Emin, is required to eject an electron. Also given wavelength of the light is 540 nm. The kinetic energy ejected by the electron is 260 x 10-20 J.

When the wavelength is 400 nm, the kinetic energy is 1.54 x 10-19 J.

The energy of the electron can be calculated as,

\(E = hc/\lambda\)

Where, \(E\) is the energy of the electron, \(h=6.626\times10^{(-34)} \;\rm Js\) is plank's constant, \(c\) is the speed of light that is \(3 \times 10^8 \;\rm m/s\) and \(\lambda\) is the wavelength.

So the energy of the electron is,

\(E = \dfrac{6.626\times 10^{(-34)} \times 3\times 10^8}{540\times 10^{(-9)}}\)

\(E = 3.68 \times 10^{(-19)} \;\rm J\)

The energy of the electron is  \(E = 3.68 \times 10^{(-19)} \;\rm J\).

The Emin can be calculated as given below.

\(E_{min} = E - KE\)

Where \(KE\) is the kinetic energy of the electron that is given as \(260 \times 10^{(-20)} \;\rm J.\)

So \(E_{min} = 3.68\times 10^{(-19)} - 2.60\times 10^{(-20)}\)

\(E_{min} = 36.8\times 10^{(-20)} - 2.60\times 10^{(-20)}\)

\(E_{min} = 34.2 \times 10^{(-20)} \;\rm J.\)

The minimum energy of the electron is \(E_{min} = 34.2 \times 10^{(-20)} \;\rm J.\)

For the longest wavelength, the electron will have its minimum energy that is Emin.

Hence, the longest wavelength can be calculated as given below.

\(\lambda = \dfrac {h\times c} {E_{min}}\)

\(\lambda=\dfrac{6.626\times 10^{(-34)} \times 3\times 10^8} {34.2 \times 10^{(-20)}}\)

\(\lambda = 549 \times 10^{(-9)} \;\rm m\\\lambda = 549 \;\rm nm\)

The longest wavelength of the electron is 549 nm.

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The object is on 81 cm high.

The energy that an item has or acquires when its location changes as a result of being in a gravitational field is known as gravitational potential energy. Gravitational potential energy can be defined as an energy that has a connection to gravitational force or gravity.

Given that: an 80kg object has 632 J of Potential energy.

Let the height is h: then,

mgh = PE

80 kg × 9.8× m/s^2 × h = 632 Joule

h = 0.81 m = 81 cm.

The object is on 81 cm high.

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Answer:

9 hours

Explanation:

For each battery:

Current = 1 A

Voltage = 1.5 V

current and EMF required = 5.0 A and 4.5 V

Since each battery has a current of 1 A, we'll need to link five of them in parallel with our load to get a current of 5 A. so that the total current equals 5 amps . Now that each battery has a 1.5 V voltage drop and we require an emf of 4.5 V, we would use three batteries in series rather than a single battery.  So, there is a need to must substitute every single battery with three batteries in series for all five single batteries linked in parallel.

So, the total no. of batteries is

= 5 × 3 = 15 batteries.

On each battery, the charge is = 3 amp hours

∴

The total charge = 15 × 3 = 45 amp hours.

Since the charge transferred within 1 hour = 5 amp

Then, the required lifetime of the battery is:

= 45 amp-hours/ 5 amp

= 9 hours

B. A chemical change

Explanation:

I'm guessing ?

The resultant of two displacement vectors having opposite directions is the difference of the two displacements, having the same direction as the smaller vector.

When two displacement vectors have opposite directions, it means they are pointing in opposite ways. In other words, one vector is in the opposite direction of the other. To find the resultant of these vectors, we need to subtract one vector from the other.

If we consider two displacement vectors, let's say vector A and vector B, and they have opposite directions, we can represent them as A and -B.

To find the resultant, we subtract vector B from vector A: A - (-B) or A + B.

The resultant will have the same direction as the smaller vector. This is because when we subtract a larger vector from a smaller vector, the resultant will have the direction of the smaller vector.

Therefore, the correct option is: "The resultant is the difference of the two displacements, having the same direction as the smaller vector."

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Answer:

m g h = 1/2 m v^2     potential energy will be converted to kinetic energy

h = h0 (1 - cos theta)    where theta is the displacement

theta = 30 / 50 = .6        theta = 36.9 deg        

v^2 = 2 g h    from above

h = 50 (1 - cos 36.9) = 50 * .2 = 10 cm

v = (2 * 980 * 10)^12 = 140 cm/sec

A trajectory correction calls for a rocket firing that imparts an impulse of 5.51N/s. If the rocket's average thrust is 124mN , then the rocket should fire for

The pace at which electrical energy is transmitted by an electric circuit is referred to as its power. The watt is the SI unit of power, equal to one joule per second. Watts, like other SI units, have standard prefixes: thousands, millions, and billions of watts are referred to as kilowatts, megawatts, and gigawatts, respectively.

It is a popular misperception that electric power is purchased and sold, whereas electrical energy is. Electricity, for example, is sold to users in kilowatt-hours (kilowatts multiplied by hours), because energy is defined as power multiplied by time.

Given,

Impulse = 5.51 N/s

force = 125 mN

impulse = Force × Time

5.51 = 125 × 10⁻³ × Time

Time = 5.51 ÷ 125 × 10⁻³

time = 44.08 s

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true

Explanation:

computers have become a need in many businesses and homes we now living in a era of technology a computer is now a neccecity

The statement is True.

Personal computers have become an essential fixture in most businesses and households.

They have revolutionized the way we work, communicate, access information, and perform various tasks.

In the business world, personal computers are ubiquitous, serving as indispensable tools for productivity, data management, communication, and decision-making.

From small businesses to large corporations, computers have streamlined operations and enhanced efficiency.

Similarly, in homes, personal computers have become commonplace, enabling individuals and families to connect with the world, pursue online education, engage in entertainment, and manage various aspects of their lives.

With their versatility and functionality, personal computers have become an integral part of modern life, transforming the way we live and work.

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The magnitude of the load L on the crane before the collapse is 3211.81 N

To determine the magnitude of the load on the crane (L), we will need to make use of the equilibrium conditions of the torque.

It is always an ideal process to list out all the parameters given as this will let you understand how you can determine the answer to the question from the given parameters.

From the given information;

From the question;

the angle at which the crane is positioned can be determined by taking the tangent of the angle θ. i.e.

\(\mathbf{tan \ \theta = \dfrac{h}{d-s}}\)

\(\mathbf{\theta = tan^{-1} \Big ( \dfrac{h}{d-s} \Big )}\)

\(\mathbf{\theta = tan^{-1} \Big ( \dfrac{2.070 }{5.580 - 0.522} \Big )}\)

\(\mathbf{\theta =22.26^0}\)

Consider the equilibrium conditions of the torques with respect to the magnitude of the load at point P.

∴

\(\mathbf{Tsin \theta (d-s) - W_L (d-x) -(Mg) (\dfrac{d}{2}) = 0}\)

By making the magnitude of the load \(\mathbf{W_L}\) the subject of the formula, we have:

\(\mathbf{W_L = \dfrac{Tsin \theta (d-x) -(Mg) (\dfrac{d}{2})}{ (d-s) } }\)

\(\mathbf{W_L = \dfrac{(11650 )sin (22.26) (5.580-1.350) -(88.50\times 9.81) (\dfrac{5.580}{2})}{ (5.580-0.522) } }\)

\(\mathbf{W_L = 3211.81 \ N }\)

Therefore, we can conclude that the magnitude of the load is 3211.81 N

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Answer:

380 to 700 nanometers.

Explanation:

Answer:

  411.6 N

Explanation:

The force is given by ...

  F = ma . . . . m represents mass

  F = (42 kg)(9.8 m/s^2) = 411.6 N . . . . m represents meters

The force on the object due to gravity is 411.6 newtons.

Answer:

the rate of change of velocity per unit of time.

Answer:

accelerate is rate of chang of velocity

Hi there!

We know that:

Force due to gravity = Mgsinθ

Force due to friction = μMgcosθ

Let the positive direction be directed in the direction of the block's acceleration, which is downward.

Thus:

ΣF = Mgsinθ - μMgcosθ

Solving for acceleration requires diving all terms by the mass, so:

a = gsinθ - μgcosθ

Substitute in given values. (g = 9.8 m/s²)

a = 9.8sin(30) - 0.3(9.8)cos(30) = 2.354 m/s²

If star Cluster A has O and B main sequence stars, while Cluster B only has G spectral type and cooler main sequence stars, then the younger cluster is Cluster A.

An astronomic star cluster is a group of stars that may be recognized to have a common origin, which is also associated with the age of the stars, and they are gravitationally linked in the universe space due to physical forces that maintain connected them.

The age of a given astronomic star cluster may be measured by determining the spectral type and the temperature (spectral light) of the main sequence.

Therefore, with this data, we can see that an astronomic star cluster is composed of different stars that have a common origin and whose age can be determined by the emission spectra which are indicative of the temperature.

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We can see that Shakespeare's structure when viewed through a formalist lens is to: C. Introduce a new motif that focuses on the inevitability of death.

Who is William Shakespeare?

William Shakespeare was known as an English actor, poet and also a playwright. Many regard Shakespeare as the greatest writer in the English language. He is often seen as the world's greatest dramatist.

William Shakespeare was known to have written several plays like:

The reader aims to comprehend how words interact with one another and how different parts of the text relate to one another.

Therefore, William Shakespeare employ this technique in his study and is likely to be interested in how the various components of the text interact.

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Answer:

Fault is the correct answer

Explanation:

The rest are incorrect.

All we need to do is divide the momentum and weight to find the velocity:

v = m / w

Solve using the values we are given.

v = 952/68 = 14 m/s

Best of Luck!

The projectile's time of flight is approximately 6.6 seconds, which is closest to option B.

An object that is shot into the air and subsequently proceeds along a curved route while being pulled by gravity is said to be in projectile motion. There is no additional propulsion or lift involved. A ball that is tossed, a bullet that is shot from a pistol, or a rocket that is launched into space are examples of things in projectile motion.

We can use the kinematic equations of motion to calculate the projectile's time of flight. The initial velocity can first be divided into its horizontal and vertical components as follows:

\(Vx = V \times cos(\theta)\\= 65 m/s \times cos(30)\\= 56.18 m/s\\Vy = V \times sin(theta)\\= 65 m/s \times sin(30)\\= 32.5 m/s\\\)

where V is the magnitude of the initial velocity, and theta is the launch angle (30 degrees).

The horizontal velocity of the projectile remains constant throughout its flight, while the vertical velocity changes due to the effect of gravity. At the highest point of the trajectory, the vertical velocity becomes zero, and the time it takes to reach this point is equal to half of the time of flight.

The time it takes for the projectile to reach the highest point can be found using the following kinematic equation:

\(V_y = V_oy + a \times t\)

where Voy is the vertical component of the initial velocity (in this case, 32.5 m/s), a is the acceleration due to gravity (-9.81 m/s^2), and t is the time it takes to reach the highest point.

\(0 = 32.5 m/s + (-9.81 m/s^2) \times t\\t = 3.32 s\)

The total time of flight can be found by doubling the time it takes to reach the highest point:

time of flight = 2 × 3.32 s

                      = 6.64 s

Therefore, the projectile's time of flight is approximately 6.6 seconds, which is closest to option B.

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b) The motion will be either created, stopped, or changed.

An unbalanced force is said to act on an object if the sum of all forces acting on it is non-zero. This means that some force is acting on the object, so the object experiences an acceleration equal to F = ma.

Force Imbalance:

Thus, there will be some change in motion in the object if multiple forces applied are unbalanced.

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Answer:b…………………………….

Explanation:

The component of this vector in the unit vector notation is written as follows:

The component is in the direction of the x-axis only. The component in the y-directio

The net force on q₃ will be 17.51 N. The net force is the algebraic sum of the two forces on the pleading q₃

The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

The force,by the charge q₁ on the q₃;

\(\rm F_{31}} = \frac{Kq_1q_3}{r^2} \\\\ \rm F_{31}} = \frac{9 \times 10^9 \times -28.1 \times 10^{-6}\times \times -47.9 \times 10^{-6}}{(0.600)^2} \\\\ F_{31}} =33.64 \ N\)

The force,by the charge q₂ on the q₃;

\(\rm F_{32}} = \frac{Kq_2q_3}{r^2} \\\\ \rm F_{32}} = \frac{9 \times 10^9 \times 25.5 \times 10^{-6}\times \times -74.9\times 10^{-6}}{(0.300)^2} \\\\ F_{32}} =-19.09 \ N\)

The net force is the sum of the two forces;

\(\rm F_{net}=F_{32}+F_{31}\\\\\ \rm F_{net}=36.6-19.9 \\\\ \rm F_{net}=17.51 \ N\)

Hence, the net force on q₃ will be 17.51 N.

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I think its -88 on acellus

The velocity of the ball just before it hits the ground is 24.29m/s.

What is acceleration due to gravity?

The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.

Given:

Initial velocity u = 10m/s

height h = 25m

we know that the acceleration due to gravity g is : 9.8m/s

Therefore using the formula,

v² - u² = 2gs   where s is the height in this case and v is the final velocity.

v² - 10² = 2 x 9.8 x 25

=> v² = 490 + 100

=> v = √590

=> v = 24.29m/s

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Id say its the last option of the fourth option

Explanation:

Answer:  

1:increase the number of coils, increase the strength of the magnet

2:increase the speed of the magnet

3: increasing the time used to power up an electromagnet

Explanation:

1). Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one piece of wire.

2). Increasing the speed of the relative motion between the coil and the magnet – If the same coil of wire passed through the same magnetic field but its speed or velocity is increased, the wire will cut the lines of flux at a faster rate so more induced emf would be produced.

3). Increasing the strength of the magnetic field – If the same coil of wire is moved at the same speed through a stronger magnetic field, there will be more emf produced because there are more lines of force to cut.

Answer:Rubidium or answer 1

Explanation:took quiz

Answer: Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.

Explanation: Look at the elements they are organized on the periodic table based on their properties. (A) correctly predicts and explains the chemical reactivity of two metals.