Why doesn't the motor work?
A. There are no brushes
B. The force does not rotate the coil.
C. The magnets are arranged wrongly.
D. There is no commutator

Answer:

Explanation:

Use the equation

[tex]v^2=v_0^2+2a[/tex]Δx

In this dimension (the y dimension...the only one we have to care about for this problem), here's what we know:

a = -32 ft/s/s

v₀ = 0 m/s (since someone was holding the stone still before it was dropped)

v = 136 ft/s

Δx = ??

Filling in:

[tex]136^2=0^2+2(-32)[/tex]Δx so

Δx = [tex]\frac{136^2}{2(-32)}[/tex] so

Δx = -289 feet (negative because the stone dropped that many feet below the point from which it was dropped, but you would answer a height question with the positive of this number. If you were asked how far the stone dropped, it would be negative; if you're asked how tall the cliff is, that would be positive)

Answer:

There are six major nutrients: Carbohydrates (CHO), Lipids (fats), Proteins, Vitamins, Minerals, Water.

Explanation:

Answer: the iris

Explanation: I looked it up

Answer:

Iris

Explanation:

Because (iris) has muscles that can expand/contract depends to the amount of light that pupil needs to process/figure out images.

Answer:

d. In dc steady state conditions, the voltages across the capacitors are constant and the currents through the capacitance are zero. The current through the inductors are constant and the voltage across the inductances are zero.

Explanation:

The current through a capacitor is given by i = CdV/dt where C = capacitance of capacitor and V = voltage across capacitor. At steady state dV/dt = 0 and V = constant. So, i = CdV/dt = C × 0 = 0.

So, in dc steady state, the voltage across a capacitor is constant and the current zero.

The voltage across an inductor is given by V = Ldi/dt where L = inductance of inductor and i = current through inductor. At steady state di/dt = 0 and V = constant. So, V = Ldi/dt = L × 0 = 0.

So, in dc steady state, the voltage across an inductor is zero and the current constant.

So, In dc steady state conditions, the voltages across the capacitors are constant and the currents through the capacitance are zero. The current through the inductors are constant and the voltage across the inductances are zero.

The answer is d.

Answer:

HOPE IT HELPS YOU!!!

Explanation:

Mark FadedGirl25 as brainliest

Answer:

   v = 4.1 m / s

Explanation:

Velocity is defined by the relation

          v =[tex]\frac{dx}{dt}[/tex]

 we perform the derivative

         v = 4.1 m / s

Another way to find this magnitude is to see that the velocity on the slope of a graph of h vs t

        v = [tex]\frac{\Delta x}{\Delta t}[/tex]

        Δx = v Δdt + x₀

        h=   4.1 t + 5.5

         v = 4.1 m / s

         x₀ = 5.5 m

Answer:

her total time taken for the race is 11.58 s

Explanation:

mass of the sprinter, m = 59 kg

acceleration of the sprinter, a = 3.9 m/s²

initial distance covered by the sprinter, d₁ = 12 m

Time taken to cover the first 12 m;

d₁ = ut + ¹/₂at²

where;

u is her initial velocity = 0

d₁ = ¹/₂at²

2d₁ = at²

[tex]t_1 = \sqrt{\frac{2d_1}{a} } \\\\t_1 = \sqrt{\frac{2\times 12}{3.9} }\\\\t_1 = 2.48 \ s[/tex]

The velocity of the sprinter at the end of the 12 m;

v = u + at

v = 0 + at

v = at

v = 3.9 x 2.48

v = 9.67 m/s

The last distance covered by the sprinter at the constant velocity of 9.67 m/s = (100 - 12)m = 88 m

The time taken to cover 88 m with an initial velocity of 9.67 m/s is calculated as;

d₂ = vt + ¹/₂at²

Since the velocity is constant, the acceleration, a = 0

d₂ = vt₂

t₂ = d₂/v

t₂ = 88 / 9.67

t₂ = 9.1 s

The total time taken for the race = t₁ + t₂

                                                       = 2.48 s  +  9.1 s

                                                        = 11.58 s

Answer: D

The force decreases inversely proportional to 1/r(squared)

Explanation:

I looked it up im sure this is correct

Answer:

option d

Explanation:

Two objects are attracted to each other by a gravitational force F. ... As the distance r from the center of the planet increases, what happens to the force of gravity on the rocket? The force decreases inversely proportional to 1/r(squared) A spacecraft is orbiting Earth with an orbital radius r.

the force of gravity is represented as

F = GM1M2/r²

now the mass of warth and rocket is considered to be constant and G is a universal constant so it can be said

F is inverse to r²

therefore as the value of r increases that is distance between earth and rocket increases the force decreases

(Follows inverse square law)

Answer:

The angular velocity of the wheels is 276.314 radians per second.

Explanation:

The wheels are rolling, which is a combination of rotation and translation, whose center of rotation is the point of contact between the wheel and the ground and the geometrical center of the skateboard experiments pure translation. Then, the angular velocity can be found by using the following kinematic expression:

[tex]\omega = \frac{v}{R}[/tex] (1)

Where:

[tex]\omega[/tex] - Angular velocity, in radians per second.

[tex]v[/tex] - Velocity of the wheel at its center, in inches per second.

[tex]R[/tex] - Radius of the wheel, in inches.

If we know that [tex]v = 404.8\,\frac{in}{s}[/tex] and [tex]R = 1.465\,in[/tex], then the angular velocity of the wheels are:

[tex]\omega = \frac{404.8\,\frac{in}{s} }{1.465\,in}[/tex]

[tex]\omega = 276.314\,\frac{rad}{s}[/tex]

The angular velocity of the wheels is 276.314 radians per second.

Answer:

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Answer:

Different surfaces

Answer:

λ = 0.03 s⁻¹

Explanation:

The formula for decay constant can be used as follows:

[tex]N = N_oe^{-\lambda t}\\\\\frac{N}{N_o} = e^{-\lambda t}[/tex]

where,

[tex]\frac{N}{N_o}[/tex] = ratio of remaining nuclei to the initial value of nuclei = [tex]\frac{1}{6}[/tex] = 0.167

t = time = 60 s

λ = decay constant = ?

Therefore,

[tex]0.167 = e^{-\lambda(60\ s)}\\\\-\lambda (60\ s) = ln(0.167)\\\\\lambda = \frac{-1.7917}{- 60\ s}[/tex]

λ = 0.03 s⁻¹

Answer:

An excited atom is unstable and tends to rearrange itself to return to its lowest energy state. ... The lines in an emission spectrum occur when the electron loses energy, "falls back", from a higher energy state to a lower one emitting photons at different frequencies for different energy transitions.

Explanation:

Answer:

A complete third electron shell holds 8 electrons

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hope it helps...

have a great day!!

Answer:

8

Explanation:

Answer: A quasar is an exceptionally bright active galactic nucleus (AGN) containing a supermassive black hole surrounded by a gaseous accretion disk with a mass ranging from millions to billions of times that of the Sun.

Explanation: Energy is emitted in the form of electromagnetic radiation when gas in the disk descends towards the black hole, which can be seen across the electromagnetic spectrum.

Answer: The voltage needed is 35.7 V

Explanation:

Assuming that the resistors are arranged in parallel combination.

For the resistors arranged in parallel combination:

[tex]\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}[/tex]

We are given:

[tex]R_1=20\Omega\\R_2=20\Omega\\R_3=200\Omega[/tex]

Using above equation, we get:

[tex]\frac{1}{R}=\frac{1}{20}+\frac{1}{20}+\frac{1}{200}\\\\\frac{1}{R}=\frac{10+10+1}{200}\\\\R=\frac{200}{21}=9.52\Omega[/tex]

Calculating the voltage by using Ohm's law:

[tex]V=IR[/tex]         .....(1)

where,

V = voltage applied

I = Current = 3.75 A

R = Resistance = [tex]9.52\Omega[/tex]

Putting values in equation 1, we get:

[tex]V=3.75\times 9.52\\\\V=35.7V[/tex]

Hence, the voltage needed is 35.7 V

There are six different ways to arrange those resistors.

Each way leads to a different answer.

You didn't tell us how you want them connected.

The attached drawing shows them all.

Answer:

the 5 is because u have to select the currents and volts which gives us 2 and 1 plus 3 is 6 but if we rest 1 is 5, thats the answer

Explanation:

to determine light brightness

to determine planet compositition

to determine the ages of p

This is convex lens .

hence It's a converging lens .

The picture shown is a type of converging lens. The correct option is A.

A converging lens, also known as a convex lens, is a type of optical lens that is thicker in the middle than at the edges. It is shaped like a curved-outward disc and is commonly used in optical systems such as cameras, telescopes, and microscopes. When light passes through a converging lens, it bends inward and converges at a focal point located on the other side of the lens.

This focal point is determined by the curvature of the lens and its refractive index, which affects how much the light is bent. The distance between the lens and the focal point is called the focal length, and it determines the magnification and the image size produced by the lens. Converging lenses are used in many applications that require focusing and magnifying light, such as correcting vision problems and creating images in photography and microscopy.

Therefore, The correct answer is converging lens.

To learn more about the lens equation click:

https://brainly.com/question/11971432

#SPJ2

Answer:

2.8 seconds

Explanation: Given that a simple pendulum that consists of a massless 2.00-meter length of rope attached to a 5.00-kg mass at one end. What is the period of oscillation for this simple pendulum

The parameters given are :

Length = 2 m

Mass = 5kg

Using the formula below

T = 2 pi × sqrt ( L / g )

Substitute all the parameters into the formula.

T = 2 × 3.143 × sqrt ( 2 / 9.8 )

T = 2 × 3.143 × 0.4517

T = 2.838 s

Therefore, the period of oscillation for this simple pendulum is 2.8 s approximately.

Answer: 1.2%

Explanation:

Given

If one borrows $12,250

and give $147 interest on it

Then the interest is given from the formula

[tex]\Rightarrow S.I=\dfrac{P\times R\times T}{100}\\\\\Rightarrow 147=\dfrac{12,250\times R\times 1}{100}\\\\\Rightarrow R=\dfrac{147}{122.50}\\\\\Rightarrow R=1.2\%[/tex]

Thus, the annual rate of interest  is 1.2%

Answer:

Explanation:

The equation for Power is

P = Work/time to do work and the equation for work is

Work = FΔx

We first need to find the amount of work done, then we can find the power it took to do that work.

W = 2000(9.8)(28) so

W = 550,000 N*m

Now we fill that into the power equation:

[tex]P=\frac{550000}{30}[/tex] gives us

P = 18000 Watts. But we need kW, so we divide by 1000 to get

P = 18 kW of power.

Answer:

18.293 kilowatts

Explanation:

Given that, mass (m) = 2000 kg

Height (h) = 28m

Time(t) = 30 seconds

To find: power required in kilowatts

Now required work done will be m*g*h

= 2000*9.8*28=548800 newton

Now power required is given by (P) = work done /(time taken)

= 548800/30 = 18293.333 watts

= (18293.333 / 1000) kilowatts

= 18.293 kilowatts.

Answer:

Send a clear photo again

Explanation:

And tag me

Answer:

a. 3.09 m/s^2

b. 322.52 N

Explanation:

The computation of the acceleration of the object and the tension of the string is as follows:

The acceleration of the system is a

= (m1 - m2) × g ÷ (m1 + m2)

= (48 - 25) × 9.81 ÷ (48 + 25)

= 3.09 m/s^2

b. The tension in the string is T

= 2 × m1 × m2 × g÷   (m1+m2)

= (2  × 48  × 25  ×  9.81) ÷  (48 + 25)

= 322.52 N

Answer:

a) increases.

b) remains the same.

c) increases.

d) increases.

e) increases.

f) increases.

Explanation:

a)

       [tex]C = \epsilon_{0}*\frac{A}{d} (1)[/tex]

       where ε₀ = permitivitty of  free space

                   A = area of one of the plates

                   d=  plate separation

b)  

        [tex]C = \frac{Q}{V} (2)[/tex]

c)

d)

       [tex]U = \frac{1}{2}* C*V^{2} (3)[/tex]

e)

       [tex]V = E*d (4)[/tex]

f)

       [tex]u = \frac{U}{v} = \frac{\frac{1}{2}* C*V^{2}}{A*d} =\frac{1}{2}* \epsilon_{0}*\frac{A*V^{2} }{A*d*d} = \frac{1}{2} *\epsilon_{0}*E^{2} (5)[/tex]

Answer:

The mass decreases

Explanation:

Just smart

Answer:

So logically speaking the question you have asked makes no sense

Explanation:

Zero what? After landing where? How what? before asking a question think about how other people will read it.  

Answer:

to focus the link light

Explanation:

Because the lens is flexible and elastic, it can change its curved shape to focus on objects and people that are either nearby or at a distance. ... The ciliary muscles, which are part of the ciliary body, are attached to the lens and contract or release to change the lens shape and curvature.

Answer:

to focus the link light

Explanation:

vote brainliest I never got voted brainliest plssss