Which combination of a wire coil and a core would make the strongest
electromagnet?

A. 200 coils of bare wire around a hollow cardboard core

B. 200 coils of insulated wire around a steel bolt

C. 50 coils of insulated wire around a hollow cardboard core

D. 50 coils of bare wire around a steel bolt

Answer:

The height of the platform is 22.686 m.

Explanation:

Given;

initial velocity of Janet, u = 2.63 m/s

time of her motion, t = 1.9 s

The height of the platform is given by;

h = ut + ¹/₂gt²

substitute the given values and solve for height "h"

h = (2.63 x 1.9) + ¹/₂(9.8)(1.9)²

h = 4.997 + 17.689

h = 22.686 m

Therefore, the height of the platform is 22.686 m.

Answer:

The current drawn by the heater is 12 A.

Explanation:

Given;

power dissipated by heater, P = 1440 W

Source voltage, V = 120 V

The electric power of the heater is given by;

P = IV

Where;

I is the current drawn by the heater

Make I the subject of the formular;

I = P / V

Substitute the given values and solve for the current "I";

I = 1440 / 120

I = 12 A

Therefore, the current drawn by the heater is 12 A.

Answer:

False.

Explanation:

Given that if mechanical energy is converted to thermal energy, then the spring would not compress as far as it would otherwise. This will cause the spring constant to be lower than it really is.

This statement is false. Because if mechanical energy is converted to thermal energy, there will be distortions in the solid pattern of the spring. And this will make the spring to compress.

Also, no matter what may happen to the spring, the spring constant remains constant. That is, unchanged.

Answer:

see below

Explanation:

First, the obvious, as you press the gas pedal harder the acceleration goes up as well.  Conversely, is you do not press the pedal, you will not accelerate.  This determines that is I press the gas pedal, it will CAUSE the car to accelerate.  This proves causation.

Now, correlation.  The definition of correlation in statistics is any statistical relationship between two random variables or data.  This simply means that these two events are connected to one another.  A POSITIVE correlation is when two correlated events move in the same direction as one another.  I have added a graph to help visualize this.  In this problem as the gas is pressed harder, the acceleration increases.  If the pressure on the pedal was decreased, then the acceleration also decreases.  If the pressure on the pedal is constant, the the acceleration is constant.

I hope this helps!

Answer:

The value is  [tex]B = 0.0643 \ T[/tex]  

Explanation:

From the question we are told that

   The length of the solenoid is  [tex]L = 133 \ cm = 1.33 \ m[/tex]

     The radius is  [tex]r = 2.99 \ cm = 0.0299 \ m[/tex]

     The number of turns is [tex]N = 1740 \ turns[/tex]

     The current it carries is  [tex]I = 3.91 \ A[/tex]

Generally the magnitude of the magnetic field is mathematically represented as

           [tex]B = \frac{\mu_o * N * I}{L}[/tex]

Here  [tex]\mu_o[/tex]  is the permeability of free space with value  [tex]\mu_o = 4\pi *10^{-7} \ N/A^2[/tex]

=>      [tex]B = \frac{ 4\pi * 10^{-7} * 1740 * 3.91}{0.133}[/tex]  

=>      [tex]B = 0.0643 \ T[/tex]  

Answer:

False

Explanation:

Granted, sandy soil has low conductivity, but the surface layer of sandy soil isn't low particularly during the day. Sandy soil reacts more to temperature when compared with other types of soil, and as such, during the day under a hot temperature, the texture of sandy soil is usually hot, and not low like the question suggested. Invariably, the inference the question is making is wrong and not correct, so false

Answer:

They both require the same amount of work.

Explanation:

Work is said to be done if the force applied to a body cause the boody to move through a distance. Mathematically;

Workdone = Force * Distance

Workdone = mass * acceleration due to gravity * Distance

For the 100kg sack lifted through a distance of 2m:

Workdone = 100 * 9.8 * 2

Workdone = 980 * 2

Workdone = 1960Joules

For 50kg sack lifted through a distance of 4m;

Workdone = 50 * 9.8 * 4

Workdone = 200 * 9.8

Workdone  = 1960Joules.

Since the workdone in carry both sack is the same, hence they both require the same amount of work.

Answer:

b. transparent

Explanation:

Photons interact with an object by some combination of reflection, absorption and transmission. Some materials, such as plate glass and clean water, transmit much of the light that falls on them and reflect little of it; such materials are called optically transparent.

Answer:

24 m/s

Explanation:

Given that,

A typical road bike wheel has a diameter of 70 cm including the tire.

Speed of the cyclist = 12 m/s

We need to find the speed at the top of the tire moving. The velocity of the topmost point is twice that of the velocity of the object.

v = 2 × 12

= 24 m/s

Hence, the required velocity is 24 m/s.

The speed at which the point at the top of the tire moves is 24 m/s.

Given that,

Based on the above information, the calculation is as follows:

We know that the velocity of the point should be the twice of the object velocity.

So,  

= 2 (12)

= 24 m/s

Therefore we can conclude that the speed at which the point at the top of the tire moves is 24 m/s.

Learn more: brainly.com/question/23334479

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 1.4 \times {2.2}^{2} \\ = 0.7 \times 4.84 \\ = 3.388 \: \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

Answer:

im not sure

Explanation:

Answer:

292 m

Explanation:

Step one:

given data

initial velocity velocity v= 32 m/s

final  velocity u= 0 m/s

acceleration a= 3.5m/s^2

Required

The distance covered upon the application of the brake

Step two:

we know that acceleration

a= v-u/t

t= v-u/a

t= (0-32)/3.5

t=32/3.5

t=9.14seconds

also, to find distance, we  use s=d/t,

rearrange as d=s*t  

d=32*9.14 s

d=292 m

Answer:

It should be B.

Explanation:

Because expansionary monetary policy works by expanding the money supply faster than usual or lowering short-term interest rates. It is enacted by central banks and comes about through open market operations, reserve requirements, and setting interest rates.

I hope this helped!!!

Explanation:

Yes, it is possible to have zero speed while accelerating, but only for a moment. ... acceleration is the rate at which the speed and direction of an object changes over time, so whenever an object goes through zero speed while reversing directions, it has non-acceleration. zero but a speed of zero.

Answer:

a) 0.47MW

b) 39.24%

Explanation:

In order to find the power needed for the elevator to operate at its maximum capacity, we can make use of the following formula:

P=Fv

where P is the power, F is the force and v is the velocity.

The force the elevator must carry can be calculated with the following formula:

F=mg

where m is the mass of the elevator and g is the acceleration of gravity, so:

[tex]F=(8000 kg)(9.81 m/s^{2})[/tex]

F=78 480 N

so now we can make use of the power formula:

P=Fv

P=(78 480N)(6 m/s)

P=470 880W

P=0.47W

b)

In order to find the efficiency, we will suppose that the generator can generate a maximum of 0.47 W so we use the following formula:

[tex]efficiency = \frac{P_{in}}{P_{out}}*100\%[/tex]

[tex]efficiency=\frac{0.470880}{1.2}*100\%[/tex]

efficiency=39.24%

Answer:

wish I could help

Explanation:

I been rereading this and I can't solve it lemme go ask people in ma house real quick

Answer:

which of the cars are speeding up: c

which of the cars or slowing down: a

which of the cars are maintaning a constant speed: b

Explanation:

Answer:

Explanation:

I gave a good enough explanation in your other posting. I'm sorry that I'm eating up your points.

The orange line is speeding up

The blue line is neither speeding up nor slowing down. It's speed is constant.

The green line is starting from 4 m/s and is slowing down to 0.

The diagram helps a lot. Thank you for that.

Hi there!

[tex]\large\boxed{\text{50 seconds.}}[/tex]

Begin by calculating the acceleration on the object by using the formula

F = m · a (Newton's Second Law) where:

F = Force (N)

m = Mass (kg)

a = acceleration (m/s²)

Plug in the given values:

10  = 50 · a

10 = 50a

10 / 50 = a

a = 1/5 = 0.20 m/s²

Solve for the time using the kinematic equation:

Δv / a = t, or (vf - vi) / a = t

Plug in the acceleration along with the initial and final velocites into the equation:

(12 - 2) / 0.20 = 10 / 0.20 = 50 seconds.

Answer:

the no. of ejected electrons per second will increase.

Explanation:

In photoelectric effect, when a light is incident on a metal surface it ejects some electrons from the metal surface. The energy of photon of light must be equal to or greater than the work function of that metal. All the extra energy above the work potential appears as the kinetic energy of the ejected electrons. So, greater he energy of photon greater will be the kinetic energy of the ejected electrons.

A single photon interacts with a single electron and ejects it only if its energy is greater than work function. So, the increase in no. of photons per second means an increase in the intensity of laser beam. And greater no. of photons, will interact with greater no. of electrons. So, the no. of ejected electrons per second will increase.

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 600 × 2.2

We have the final answer as

Hope this helps you

Answer:

I wud respond no, actually it registers ur temperature

Answer:

F = 268 Hz

Explanation:

The beat frequency is given as:

[tex]Beat Frequency = |Frequency 1 - Frequency 2|\\[/tex]|

So, for the first flute and tuning fork:

[tex]20 Hz = |248 Hz - F|[/tex]

where,

F = Frequency of tuning fork

F = 248 Hz ± 20 Hz

F = 268 Hz (OR) 228 Hz

Now, for the second flute and tuning fork:

[tex]20 Hz = |288 Hz - F|[/tex]

where,

F = Frequency of tuning fork

F = 288 Hz ± 20 Hz

F = 268 Hz (OR) 308 Hz

Since, 268 Hz is common from both calculations. Therefore, it will be the frequency of the tuning fork.

F = 268 Hz

Answer:

I only know answer A and it's 2825.28 N/m, with rounding it's 2825.5

Explanation:

Use the m*g*h=1/2*k*x^2 equation

96*9.81*60=1/2*k*2^2

5650.56=2k

5650.56/2=2825.28N/m

Answer:

The value is  [tex]T = 29.58 \ N[/tex]

Explanation:

From the question we are told that

      The mass of the stone is  [tex]m = 0.2 \ kg[/tex]

      The radius of the circle is [tex]r = 0.6 \ m[/tex]

      The angular speed is  [tex]w = 150 \ rpm = \frac{ 2 * \pi * 150 }{ 60 } = 15.7 \ rad/s[/tex]

Generally the tension in the string is mathematically represented as

           [tex]T = m * r * w ^2[/tex]

=>        [tex]T = 0.2 * 0.6 * 15.7 ^2[/tex]

=>        [tex]T = 29.58 \ N[/tex]

Answer:

The pressure is 107417976.4 N[tex]m^{-2}[/tex]

Explanation:

The pressure of water at a given height/ depth can be determined by:

Pressure = σhg

Where: σ is the density of water, h is the height/ depth, and g is the gravitational force.

Given that; h = 10994 m, but σ = 997 kg/[tex]m^{3}[/tex] and g = 9.8 m/[tex]s^{2}[/tex]

Thus, the pressure of water at the deepest part of the ocean will be:

Pressure = 997 x 10994 x 9.8

               = 997 x 107741.2

               = 107417976.4

Pressure  = 107 420 KN[tex]m^{-2}[/tex]

The pressure of water at 10994 m below the surface is 107417976.4 N[tex]m^{-2}[/tex]

Answer:

The momentum before collision and momentum after collision is equal in a frame of reference moving at 10.0 m/s in the direction of the moving car.

Explanation:

[tex]m_1[/tex] = Mass of moving car = 1990 kg

[tex]u_1[/tex] = Velocity of moving car in stationary frame = 20 m/s

[tex]m_2[/tex] = Mass of stationary car = 1540 kg

[tex]u_2[/tex] = Velocity of stationary car in stationary frame = 0 m/s

v = Combined velocity in stationary frame

Momentum conservation for stationary frame

[tex]m_1u_1+m_2u_2=(m_1+m_2)v\\\Rightarrow v=\dfrac{m_1u_1+m_2u_2}{m_1+m_2}\\\Rightarrow v=\dfrac{1990\times 20+0}{1990+1540}\\\Rightarrow v=\dfrac{3980}{353}\ \text{m/s}[/tex]

In frame moving at 10 m/s the velocities change in the following ways

[tex]u_1=20-10\\\Rightarrow u_1=10\ \text{m/s}[/tex]

[tex]u_2=0-10\\\Rightarrow u_1=-10\ \text{m/s}[/tex]

[tex]v=\dfrac{3980}{353}-10\\\Rightarrow v=\dfrac{450}{353}\ \text{m/s}[/tex]

Momentum before collision

[tex]m_1u_1+m_2u_2=1990\times 10+1540\times -10\\\Rightarrow m_1u_1+m_2u_2=4500\ \text{kg m/s}[/tex]

Momentum after collision

[tex](m_1+m_2)v=(1990+1540)\times \dfrac{450}{353}\\\Rightarrow (m_1+m_2)v=4500\ \text{kg m/s}[/tex]

The momentum before collision and momentum after collision is equal. So, the momentum is conserved in a reference frame moving at 10.0 m/s in the direction of the moving car.

Answer:

T₂ = 36.36°C

Explanation:

The complete question is:

A 0.5 kg block of aluminum (Caluminum = 900J/kg*C)is heated to 200 C. The block is then quickly placed in an insulated tub of cold water at 0C (Cwater=4186J/kg*C) and sealed. At equilibrium, the temperature of the water and block are measured to be 20C.

A)     If the original experiment is repeated with a 1.0 kg {kg} aluminum block, what is the final temperature of the water and block?

Answer: We will apply the law of conservation of energy here:

Heat Loss by Aluminum Block = Heat Gained by Water

m₁C₁ΔT₁ = m₂C₂ΔT₂

where,

m₁ = mass of aluminum block

C₁ = Specific Heat Capacity of Aluminum Block = 900 J/kg °C

ΔT₁ = Change in Temperature of Aluminum Block

m₂ = mass of water

C₂ = Specific Heat Capacity of Water = 4186 J/kg °C

ΔT₂ = Change in Temperature of water

Therefore, for initial given condition:

m₁ = 0.5 kg

ΔT₁ = 200°C - 20°C = 180°C

m₂ = ?

ΔT₂ = 20°C - 0°C = 20°C

Therefore,

(0.5 kg)(900 J/kg °C)(180°C) = m₂(4186 J/kg °C)(20°C)

m₂ = 81000 J/(83720 J/kg)

m₂ = 0.97 kg

Now, we have the mass of water. So, we can solve for the final equilibrium temperature if the mass of block is changed to 1 kg. So, for the new state:

m₁ = 1 kg

m₂ = 0.97 kg

ΔT₁ = 200°C - T₂

ΔT₂ = T₂ - 0°C

T₂ = Final Equilibrium Temperature = ?

Therefore,

(1 kg)(900 J/kg °C)(200°C - T₂) = (0.97 kg)(4186 J/kg °C)(T₂ - 0°C)

180000 J  - (900 J/°C)(T₂) = (4050 J/°C)(T₂)

180000 J = (900 J/°C)(T₂) + (4050 J/°C)(T₂)

T₂ = (180000 J)/(4950 J/°C)

T₂ = 36.36°C

Answer:

A student is conducting a pendulum experiment. Which of the following pieces of safety equipment would be the most vital to conduct this test?

Explanation:

Answer:

Mandible.

Explanation:

The mandible in the bone that allows you to open and close your mouth, otherwise known ad the jawbone.

Answer:

mandible

Explanation:

which is also the lower jaw and it allows the mouth to open and close

hope i helped

Answer:

free points let's gooo

Answer:

    λ = 482.05 nm

Explanation:

The diffraction phenomenon and the diffraction grating is described by the expression

         d sin θ = m λ

where d is the distance between two consecutive slits, λ the wavelength and m an integer representing the order of diffraction

in this case they indicate the distance between slits, the angle and the order of diffraction

         λ = [tex]\frac{d sin \theta }{m}[/tex]d sin θ / m

let's calculate

         λ = 1.00 10⁻⁶ sin 74.6 / 2

         λ = 4.82048 10⁻⁷ m

Let's reduce to nm

         λ = 4.82048 10⁻⁷ m (10⁹ nm / 1 m)

         λ = 482.05 nm