explain how electric motors convert electrical energy to mechanical energy​

Explanation:

Newton second law of motion

Answer:

1)  The block of wood is at rest.

2)  Weight and Normal Reaction (see attached diagram).

Explanation:

Assumptions

Question 1

"At rest" or "resting" means that the object isn't moving.

Therefore, the block of wood is at rest.

Question 2

Forces that are acting on the block of wood:

See attached diagram.

Answer:

c: to show forces acting on an object

The constant acceleration of the green car is -2m/s2

Given,at t= 0

d=220m(distance between the cars)

let v0 be the final velocity of the green car

And,a be the green car acceleration

Then,for the red car with V1= 20km/h=5.56m/s the passing point

X1=44.5m

t1=X1/V1 =8.01s

then,X1-d=Vot1+1/2at2.......... equation (1)

And,for the red car with V2=40km/h=11.11m/s,the passing point

X1=76.6m

t2=X2/V2= 6.894s

then,X2-d= V0 t2+1/2at2.......equation (2)

on solving equation (1) & (2),

We obtain the following results;

The initial velocity of the green car is = -2m/S2 (the negative sign means that it's along the -X direction)

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Disclaimer: The question was given incomplete on the portal.Here is the complete question.

Question:a red car and a green car, identical except for the colour, move toward each other in adjacent lanes and parallel to the x−axis. At time t=0, the red car is at x r =0, and the green car is at x g =220m. If the red car has a constant velocity of 20km/h, the cars pass each other at x=44.5m, and if it has a constant velocity of 40km/h, they pass each other at x=76.6m. What is the constant acceleration of the green car?

   The value of the acceleration of the earth toward it when it accelerates toward the earth with 9.8m/s² is a = 7.35×10-²³m/s².

  Acceleration in theoretical terms refers to the derivative of the velocity function, it is the rate of change of this variable, and the physical magnitude of the motion that gives rise to the change of position.

   Forces are the definition of Newton's second law, which is stated under the relation:

∑ Force = mass × acceleration.

  In other words, force is the origin of motion since it generates acceleration in a system.

   In this case we must complete the statement:

"A student with mass 45 kg jumps off a high diving board. Using 6. 0×1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9. 8 m/s2 ? assume that the net force on the earth is the force of gravity she exerts on it."

  We determine the Force of the student:

F = ma

F = 45kg * 9.8m/s².

F = 441N

  Now we go to the acceleration of the earth:

a = F/m

a = 441N / 6×10²⁴ Kg

a = 7.35×10-²³m/s².

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The shuttlecock that is kicked upward from the roof edge of a tall building at the speed of 4m/s after 3s will have a velocity of: -25.4 m/s (the value is negative due to the object is going down)

The formula for the vertical launch upward and the procedure we will use is:

vf = v₀ - g * t

Where:

Information about the problem:

Applying the final velocity formula we get:

vf = v₀ - g * t

vf = 4 m/s - 9.8 m/s² * 3 s

vf = 4 m/s - 29.4 m/s

vf = -25.4 m/s

this negative value indicates that the object is going down

In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.

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Answer:

inertia is basically the fact that something will continue moving until something else stops it.  take friction for example.  If you roll a ball on the ground, it will eventually stop because of friction, you can kind of think of it like a gear wheel.  and i guess it relates to newtons first law of motion because it is his first law?? i don't know how to answer that

Explanation:

The subatomic particles that are least massive and most massive are the electron and neutron respectively.

Subatomic particles are defined as the elementary particles which make the fundamental constituents of all matter. The subatomic particles constitute the negatively charged electrons, the positively charged protons, and the neutral neutrons which do not have any charge on them.

Protons and neutrons on the other hand are made up of other elementary particles namely quarks. Subatomic particles have emerged a lot in the coming days with the construction of particle accelerators.

The electron is the least massive subatomic particle. It carries a negative charge of 1.602176634 × 10^−19 coulomb which is about 0.000548 amu.

Neutron is the heaviest subatomic particle having a mass of about 1.008 amu.

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Air pressure inside the balloon is 0.143 N/m²

PRESSURE : force applied perpendicular to the surface of object per unit area.

GIVEN -

Radius =  5.0m

Force = 45N

Air pressure inside the balloon is given by

       [tex]P = \frac{F}{A}[/tex]

Where

P = Pressure

F = Force

A = Area

Surface area of the sphere  = 4πr²

r is the radius of sphere

A = 4 ×3.14×(5)²

A = 314 m²

P = F/A

P =  45/314

P =  0.143 N/m²

Air pressure inside the balloon is 0.143 N/m²

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Answer:

Acceleration= 2 m/s²

Time= 10 s

Final Speed= 24  m/s

Final Speed= 85  m/s

Starting Speed= 0 m/s

Explanation:

By using, v = u + at

Acceleration= 2 m/s²

Time= 10 s

Final Speed= 24  m/s

Final Speed= 85  m/s

Starting Speed= 0 m/s

As a result, it is a noise without a pitch or wavelength. When the time comes, part of it is incidental and radiates away from you in all directions.

Following that, there is a temporal delay of 60 cm, or 0.6 m divided by 340 m/s, or 0.002 seconds. This is the amount of time it takes for the sound impulse to travel from one riser to the next. Any material will now reflect a significant portion of the sound that reaches it, and the reflected wave will sound substantially different from the shop. first sound. If there are 20 rows of seats and you hear a tone with 20 crests coming from the stands,

We are informed about this sound wave problem that a loud, sharp sound is produced in the middle of a field in an empty stadium. We hear an echo with a distinct pitch but no frequency or Waveland in the pulse.

Now that the sound has been accounted for, we need to estimate its frequency, wavelength, and duration in terms of orders of magnitude. We will now graph the air pressure versus time and model the Lord Sharp sound impulse as a single narrow peak.

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The force on each side of the loop is [tex]2.26\times10^{-4}N[/tex] away from the centre .

It is given that solenoid has 30.0 turns/cM which means we have given number of turns per unit length [tex]n=\frac{N}{L} =30\times10^{2}m[/tex] and carries a clockwise current of 15.0A .

Putting above values in equation (1) , we get

[tex]B=4\pi \times10^{-7}\times 30\times10^{2} \times15.0\\B=0.0565T[/tex]

The magnetic force exerted due to their magnetic field on the sides of the loop will be away from the center of loop and is given by equation (2) .

It is given that current in the loop is  0.200 A and length of the each side of the loop is  2.00 cm [tex]=2\times10^{_2}m[/tex] and plane of the loop perpendicular to the magnetic field of the solenoid.

Putting above values in equation (2) , we get

[tex]F=0.0565\times0.2\times2\times10^{-2}\times sin90\\F=2.26\times10^{-4}N[/tex]

Direction of force is found by Fleming' Left Hand rule which states that when the thumb, index finger and middle finger of the left hand are placed perpendicular to each other,  the thumb points in the direction of the magnetic force, the index finger points in the direction of the magnetic field, and the middle finger points in the direction of the flow.

According to Fleming's left hand rule, the magnetic force exerted due to their magnetic field on the sides of the loop will be away from the center of loop and is given by equation (2) .

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When the parallel-plate capacitors are disconnected from a battery and plates are pulled a small distance farther apart then Q remains the same, C decreases, Change in potential increases, Energy stored increases and E stays the same.

Solution:

Let's take C as the capacitance of parallel plates and Q as the Charge stored and 'd' is the distance between a plate of capacitors.

In the case of disconnection between plate capacitors, the capacitance of a parallel-plate capacitor becomes equal.

Then, charge Q remains the same i.e.

Q = εA / d = Q / Ed = Q/V

Here Q refers to the charge stored in a capacitor, E is the Electric field, V is the potential difference, and 'd' is the separation between plates.

There is an inverse relationship between potential difference and distance against the capacitance between a plate of the capacitor.

Similarly, the potential difference will increase when capacitance decreases.

E = V/d

While the values of V and d show a gradual decrease, E remains constant, therefore energy stored in the capacitor will be E = 1/2CV^2

The decrease in C causes an increase in V, as a result of which energy stored in the capacitor increases.

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   The value of the acceleration of the earth toward it when it accelerates toward the earth with 9.8m/s² is a = 7.35×10-²³m/s².

  Acceleration is defined as the second derivative of displacement or the derivative of velocity:

a = d/dt(dS/dt) = dV/st.

   It is the rate of change of velocity, it generates a constant change over time.

   Forces are the definition of Newton's second law, which is stated under the relation:

∑ Force = mass × acceleration.

  In other words, force is the origin of motion since it generates acceleration in a system.

   In this case we must complete the statement:

"A student with mass 45 kg jumps off a high diving board. Using 6. 0×1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9. 8 m/s2 ? assume that the net force on the earth is the force of gravity she exerts on it."

  We determine the Force of the student:

F = ma

F = 45kg * 9.8m/s².

F = 441N

  Now we go to the acceleration of the earth:

a = F/m

a = 441N / 6×10²⁴ Kg

a = 7.35×10-²³m/s².

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Answer:

a  = 2 m/c²

Explanation:

Given:

V₁ = 2 m/s

V₂ = `12 m/s

t = 5 c

______________

a -?

Acceleration:

a = ( V₂ - V₁) / t

a = ( 12 - 2 ) / 5 = 10 / 5 = 2 m/c²

The statement about density that is true is: density is a physical property

The density of an object is the relation that exist between the mass and the space that the object occupies. The general formula of the density is:

ρ = m/v

Where:

For example if we want to know which is the density of a body that has a mass of 100g and a volume of 150 cm³, applying the density formula we get:

ρ = 100 g/150 cm³

ρ = 0.666 g/cm³

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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According to sound power level, 80 decibel sound has greater intensity.

We need to know about sound power levels to solve this problem. The sound power level can be defined by a decibel unit. The decibel unit is proportional to the logarithm intensity ratio. It can be written as

dB = 10 log(I1 / I0)

where dB is sound power level, I1 is sound intensity and I0 is reference sound intensity (10¯¹² W/m²)

From the question we know that

Ia = 60 dB

Ib = 80 dB

Because the decibel unit is proportional to the logarithm intensity ratio, the sound with greater decibel will have greater intensity.

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Considering the definition of potential energy, the mass of a rocket 5,000 m above the Moon’s surface is 10.31 kg.

Potential energy is the energy that measures the ability of a system to do work based on its position. In other words, this is the energy that a body located at a certain height above the ground has.

Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the strength of gravity. Then, the expression applied to the gravitational energy of the object is:

Ep= m×g×h

Where:

In this case, you know:

Replacing in the definition of gravitational potential energy:

84,000 J= m×1.63 m/s²×5,000 m

Solving:

84,000 J= m× 8,150 m/s²×m

84,000 J÷ (8,150 m/s²×m)= m

10.31 kg= m

Finally, the mass of a rocket 5,000 m above the Moon’s surface is 10.31 kg.

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The potential energy stored in the spring is 0.025 J.

This is the energy stored in a spring when its is stretched or compressed through a certain length.

To calculate the potential energy stored in a spring, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the potential energy stored in the spring is 0.025 J.

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Answer:

The speed of the electron is 0.98c, given that the rest energy of an electron is 0.511MeV and the rest energy of a proton is 938MeV, with both particles having kinetic energies of 2.00MeV.

Explanation:

A particle's total energy and the rest energy follow the laws of physics and the theory of relativity. The energy of any particle is equal to mass times the speed of the light-squared relatively.

Where;  E=γ.〖mc〗^2

γ is the ratio of total energy to rest energy of the particle.

m_0 is known as the rest mass of the particle.

Rest energy can be written as: E_0=〖m_0 c〗^2

γ=K/E_0 +1         (1)

γ=1/(√1-v^2/c^2)     (2)

Putting the values of the electron energy into equation (1):

γ=2.00MeV/0.511MeV+1

γ= 3.91 + 1

γ=4.91

From equation (2),

γ=1/(√1-v^2/c^2)

Squaring both sides of the equation,

γ^2=1/(1-v^2/c^2)

1/γ^2 =1-v^2/c^2  

v^2/c^2 =1-1/γ^2  

v/c=√1-1/γ^2    

Making v subject of the formula,

v=√1-1/γ^2 ×c    (3)

Inserting the values into Equation 3,

v=√1-1/〖4.91〗^2 ×c

v=√1-1/24.11×c

v=√0.959×c

v=0.98×c

v=0.98c

Therefore, the speed of the electron is 0.98c.

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Taking into account the definition of kinetic energy, the kinetic energy of a 3.50kg block with a speed of 4.00 m/s is 28 J.

Kinetic energy is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

In other words, kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

where:

In this case, you know:

Replacing in the definition of kinetic energy:

Ec = 1/2× 3.50 kg× (4 m/s)²

Solving:

Ec= 28 J

Finally, the kinetic energy of a 3.50kg block with a speed of 4.00 m/s is 28 J.

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Answer:

increases your heart rate

Explanation:

Warming up increases your heart rate and therefore your blood flow which enables more oxygen to reach your muscles.

The speed of the ball with respect to Dina is 0.800c.

A frame of reference is a set of reference points—geometric points whose positions are known mathematically and physically—that define the origin, orientation, and scale of an abstract coordinate system.

If a body does not continuously adjust its position in relation to its environment throughout the course of time, it is said to be at rest.

In frame S', Dina and Owen are at rest.

The speed of the ball with respect to Owen, u =0.800c

The speed of the frame S' with respect to frame S,  v = 0.600c

Distance between Dina and Owen, L(p) = 1.8 × 10¹² m

Speed of light, c = 3 × 10⁸ m/s

Therefore, the speed of the ball according to Dina is 0.800c. As Dina and Owen are in the same frame.

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The five examples where pivot can be seen include the following: 1. Nut Cracker · 2. Seesaw · 3. Scissors · 4. Plier · 5. Stapler

A pivot is the fulcrum of a simple machine that serves as a point in the machine that allows for easy movement when force of load or effort is being applied at either ends.

The pivot can eithe be located at the either ends of the simple machine or at the middle of the simple machine.

Typical examples of machines that has pivot include the following:

From the examples listed above, the pivot of nutcracker and stapler are located at its end while the pivot of seesaw, scissors and pliers are located at the middle.

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The heating effect in with the residential heat pump will be  3.2 KJ/s

Heat pump - mechanical device which convert heat from low temperature to high temperature reservoir with the use of external work.

Heating effect - it is the change of electrical energy which passes through the conductor into heat energy.

The rate of heat produced. [tex]Q_{H}[/tex] is calculated by

The coefficient of residential heat pump = 1.6

The consume of electric power = 2kw

The rate of heat produced.( [tex]Q_{H}[/tex]) =

The coefficient of performance × consume of electric power

[tex]Q_{H}[/tex] = 1.6 × 2

= 3.2 KJ/s

The heating effect in with the residential heat pump will be  3.2 KJ/s

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The model house on remote renewable energy will generate (20mmm + 30sss) kilowatt-hours of energy in 10 years.

Given:

Remote Renewable House= 2 windmills + 3 turbines

1 windmill generate mmm kilowatts-hours in a year

Therefore,

2 windmills will generate,

2×mmm=2mmm kwh in a year

In 10 years, 2 windmills will generate

10×2mmm=20mmm

1 solar panel generate sss kilowatt-hour each in 1 year

3 solar panels will generate yearly

3×sss=3sss

In 10 years, 3 solar panels will generate

10×3sss=30sss

Therefore, the total energy generated in the renewable model house is in 10 years

(20mmm+30sss)  kwhr

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The plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.

What is velocity ?

velocity is defined as rate of change of displacement d of the object with respect to rate of change in time t. In mathematics It is written as :

v = d/t

it should be noted that, velocity is nothing but speed in particular direction. That is velocity is vector quality having both magnitude and direction where as speed is just the magnitude of velocity.

It is given that :

A plane moves with a velocity v of 63.5 m/s at 32 degrees South of East with the horizontal.

Therefore, the planes horizontal velocity components will be :

v₁ = vsinθ

v₁ = 63.5 x sin 32⁰

v₁ = 33.65 m/s

the planes vertical velocity components will be :

v₂ = vsinθ

v₂ = 63.5 x cos 32⁰

v₂ = 53.85 m/s

Therefore, the plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.

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Answer:

1.78m/s

Explanation:

Given parameters:

Velocity of the arrow = 22.8m/s

Height of the wall  = 15.5m

Unknown:

Time taken for the arrow to reach the ground  = ?

Solution:

To solve this problem we employ the appropriate motion equation:

     H  = ut + [tex]\frac{1}{2}[/tex] g t²

 H  is the height

  u is the initial velocity = 0

   g is the acceleration due to gravity  = 9.8m/s²

  t is the unknown time

  15.5 = [tex]\frac{1}{2}[/tex] x 9.8 x t²

  15.5 = 4.9t²

     t² = 3.16

      t = 1.78m/s

Answer:

The size of an object is directly proportional to the gravity

Explanation:

The size of an object has significant impact on the gravity exerted by such a body.

The more massive a body is, the larger the gravity it exerts.

The reason for this is because of the newton's law of universal gravitation.