Wire 1 has a resistance R1. Wire 2 is made of the same material, with length 1/2 as long and diameter 1/4. What is the resistance ratio R2/R1?

I'm assuming that you're referring to a microwave oven in the kitchen.

-- electrical energy, which it takes from the wall outlet and uses to do its job

-- radio waves, in the form of microwaves at 2.45 GHz, with which it fills the chamber in which the cold meatloaf is placed to warm

-- heat (thermal) energy, which develops inside the food, when meatloaf molecules resonate with the 2.45 GHz microwaves

-- BONUS:  visible light energy, if there's a little light bulb inside to let you see the meatloaf as it warms up

Answer:

B. Water and sugar.

Explanation:

In the given options water and sugar would be the poor conductor of electricity. Other given options such as water and salt, water and Hcl and water and NaOH are better conductor of electricity because Hcl ,NaOH, salt (Nacl) can break into their ionic form whereas water and sugar will not.

Answer: B Water and Sugar

Explanation: I checked and I had the question

Answer:

Explanation:

The ocean encloses a certain water activity, creating the Global Conveyor Belt, which is about the thermohaline circulation, which is a system of currents.

The Global Conveyor Belt is crucial to maintain nutrients and carbon dioxide cycles. There we have warm water and cold water, each contain different percentage of salt and other minerals. Basically, the cold water tend to sink under the warm water which has more salt and more ability to absorb heat. This sinking of the cold water is due to the difference of densities, warm water is less dense that cold water, and according to physics, less dense fluids float over denser fluids.

So, basically the difference of densities is what cause the sinking of the cold water.

a)

F = net braking force acting on jetliner = - 7.25 x 10⁵ N    (the negative sign indicates that the braking force acts to slow down the motion.)

m = mass of the jetliner =  3.50 x 10⁵ N

a = acceleration of the jetliner

acceleration of the jetliner is given as

a = F/m

a = (- 7.25 x 10⁵)/(3.50 x 10⁵)

a = - 2.1 m/s²

t = time interval = 10 s

v₀ = initial velocity of jetliner = 75 m/s

v = final velocity after time "t" = ?

Using the kinematics equation

v = v₀ + at

v = 75 + (- 2.1) (10)

v = 54 m/s

b)

x  = distance traveled in time "t"

using the kinematics equation

x = v₀ t + (0.5) at²

inserting the values

x = (75) (10) + (0.5) (- 2.1) (10)²

x = 645 m

This Physics question relates to Newton's second law of motion and the principles of linear motion. By utilizing the given data and appropriate formulas, we can find the final speed of the plane after 10 seconds and the distance traveled during this time.

This question is related to Newton's second law of motion which states that force is equal to mass times acceleration. Given the mass (m) of the airplane as 3.50*10^5 kg, the braking force (F) as 7.25*10^5N and the initial speed (u) as 75.0 m/s, we can find acceleration (a) by using the formula: F=ma, thus a=F/m. The negative sign indicates that the plane is slowing down.

(a) To find the final speed (v) of the airplane after 10.0 sec, you use the formula v = u + at. Here, t is 10.0 sec. Substituting the values, we determine the final speed.

(b) The distance travelled can be found using the formula: s = ut + 0.5at^2. We know all the values so we can substitute them in to find the distance. Thus, by substitifying we get the distance traveled during this time period.

https://brainly.com/question/13447525

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The correct answer is average speed.

Since we are referring to distance expressed over time taken we are referring to average speed.

If it is displacement expressed over time taken, then we get the average velocity.

Also the velocity expressed over time will give us average acceleration.

Note that distance is a scalar quantity so it goes with another scalar quantity which is speed.

The displacement which is also a vector quantity will go with velocity which is also a vector quantity.

The correct option is B. Which is average speed.

Answer:

Velocity of the eagle = 7.08 m/s

Explanation:

  We have equation of motion , [tex]s= ut+\frac{1}{2} at^2[/tex], s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

  Vertical motion of fish:

      Initial velocity = 0 m/s , acceleration = acceleration due to gravity = [tex]9.8m/s^2[/tex], displacement = 6.1 m we need to find time.

     [tex]6.1= 0*t+\frac{1}{2} *9.8*t^2\\ \\ 4.9t^2=6.1\\ \\ t=1.116 seconds[/tex]

 Horizontal motion of fish:

      Acceleration = acceleration due to gravity = [tex]0m/s^2[/tex], displacement = 7.9 m , time = 1.116 seconds we need to find Initial velocity (u).

      [tex]7.9= u*1.116+\frac{1}{2} *0*1.116^2\\ \\ u=7.08m/s[/tex]

    So, velocity of the eagle = 7.08 m/s

Answer:

7.1

Explanation:

did endgenuity, said it's correct

(explanation above is correct, also)

waters falling. it gets u stuck inside

wind blowing. makes u feel freezing

hope this helped

The correct answer is B

Answer:

correct answer is option B(The product mass X velocity is the same for both)

Explanation:

Momentum:

momentum of a body is defined as the product of mass and velocity with which body is moving.

Momentum of a body of mass m and which is moving with velocity v is given as

[tex]p=m\times v[/tex]

if two bodies have same momentum it means the product of mass and velocity is same for both.

If two bodies have dfferent masses and if they are moving with different velocities then also they may have same momentum.

for example,

first body has mass 4kg and it is moving with 10m/s velocity

then its momentum is [tex]p_{1} =4kg\times 10ms^{-1}[/tex]

[tex]p_{1} =40kgms^{-1}[/tex]

similarly if second body has mass 2kg and if it is moving with 20m/s velocity

then its momentum is [tex]p_{2} =2kg\times 20ms^{-1}[/tex]

[tex]p_{2} =40kgms^{-1}[/tex]

Answer:

It's option d - Negative acceleration

Explanation:

Mathematically position X , velocity V and acceleration A are:

[tex] \frac{dX}{dt} = V [/tex] and [tex] \frac{dV}{dt} = A [/tex]

Where X, V, A are vectors and [tex] \frac{d(a)}{dt} = b [/tex]  indicates the derivate a of a time is equal to b.

So, this show that acceleration is a rate respect of time of velocity ⇒ When acceleration is positive, velocity increments, when acceleration is negative, velocity decrements.

The above explanation correspond to the motion map shown, getting demonstrated that the answer is D - Negative acceleration

The answer is:

Your answer is B. Hope this helps! -John

As we know that sphere roll without slipping so there is no loss of energy in this case

so here we can say that total energy is conserved

Initial Kinetic energy + initial potential energy = final kinetic energy + final potential energy

[tex]\frac{1}{2}mv_i^2 + mgh = \frac{1}{2}mv^2 + \frac{1}{2}I\omega^2+ mgh'[/tex]

as we know that ball start from rest

[tex]v_i = 0[/tex]

height of the ball initially is given as

[tex]h = Lsin\theta[/tex]

[tex]h = 1200sin53 = 960 cm[/tex]

also we know that

[tex]I = \frac{2}{5}mR^2[/tex]

also for pure rolling

[tex]v = r\omega[/tex]

also we know that

[tex]480 = m*9.8 [/tex]

[tex]m = 49 kg[/tex]

now plug in all data in above equation

[tex]480*9.60 + 0 = \frac{1}{2}*49*(0.40*\omega)^2 + \frac{1}{2}*\frac{2}{5}*49*(0.40)^2\omega^2 + 0[/tex]

[tex]4608 = 3.92\omega^2 + 1.568\omega^2[/tex]

[tex]\omega^2 = 839.65[/tex]

[tex]\omega = 29 rad/s[/tex]

So speed at the bottom of the inclined plane will be 29 rad/s

                Option-A " The intermolecular forces holding the caffeine molecules together are weaker than the ionic bonds in CuCl₂ ".

                         There are two types of interactions among the atoms and molecules. One are known as intramolecular forces while the other are known as intermolecular forces.

Examples of Intramolecular forces are ionic bonds and covalent bonds e.t.c. while examples of intermolecular forces are hydrogen bond interactions, dipole-dipole interactions e.t.c.

Remember that intramolecular forces ar far more greater in strength than the intermolecular forces. Hence, in given statement the interactions between Caffeine molecules are intermolecular forces while, that between Cu and Cl ions in CuCl₂ are intramolecular forces.

Final answer:

The lower melting point of caffeine compared to copper (II) chloride is due to the weaker intermolecular forces in caffeine as opposed to the stronger ionic bonds in CuCl2.

Explanation:

The most important reason caffeine (C8H10N4O2) has a lower melting point than copper (II) chloride (CuCl2) is that the intermolecular forces holding the caffeine molecules together are weaker than the ionic bonds in CuCl2. Option A correctly identifies that caffeine, being a covalent molecular compound, is held together by intermolecular forces which are generally less strong than the ionic bonds found in ionic compounds like CuCl2.

This is due to the fact that ionic bonds result from the electrostatic attraction between ions of opposite charge, which is a significantly stronger force than that of the intermolecular forces present in molecular compounds like caffeine.

Here it is given that speed of migrating Robin is 12 m/s relative to air

so we can say that

[tex]\vec v_{ra} = 12 m/s[/tex] North

so it will be

Let North direction is along Y axis and East direction is along X axis

[tex]\vec v_{ra} = 12\hat j[/tex]

also it is given that speed of air is 6.7 m/s relative to ground

[tex]\vec v_a = 6.7 \hat i[/tex]

now as we know by the concept of relative motion

[tex]\vec v_{ab} = \vec v_a - \vec v_b[/tex]

[tex]\vec v_{ra} = \vec v_r  - \vec v_a[/tex]

now by rearranging the terms

[tex]\vec v_r = \vec v_{ra} + \vec v_a[/tex]

[tex]\vec v_r = 12 \hat j + 6.7 \hat i[/tex]

now we need to find the speed of Robin which means we need to find the magnitude of its velocity which we found above

So here we will say

[tex]v_r = \sqrt{12^2 + 6.7^2}[/tex]

[tex]v_r = 13.7 m/s[/tex]

so the net speed of Robin with respect to ground will be 13.7 m/s

7.  First write down all the known variables while separating the values for each direction:

x-direction:

vix = 20m/s

vfx = 20m/s

x = 39.2m

y-direction:

viy = 0m/s

ay = -9.8m/s^2

y = ?

Based on the knowns, the first step is to calculate the time of flight from the x-direction as it will be the same as value for the y-direction.  Find the correct kinematic equation to do so:

x = (1/2)(vix+vfx)t

(39.2) = (1/2)(20+20)t

1.96s = t

Now that we have the time of flight, we can use the kinematic equation that will relate the known variables in the y-direction:

y = viy*t + (1/2)ay*t^2

y = (0)(1.96) + (1/2)(-9.8)(1.96)^2

y = -18.82m  (Value is negative because gravity constant was negative.  It is the height reference that from the top of the building down, which is why it is negative.  The sign can be ignored for this question.)

8.  First write down all the known variables while separating the values for each direction:

x-direction:

x = 12m

vfx = 0m/s

vix = ?

y-direction:

y1 = 1.2m

y2 = 0.6m

viy = 0m/s;

ay = -9.8m/s^2

First find time in the y-direction as it would be the same value for the x-direction.

(y2 - y1) = viy*t + (1/2)ay*t^2

(-0.6) = (0)t + (1/2)(-9.8)t^2

t = 0.35s

Now that we have the time of flight, we can use the kinematic equation that will relate the known variables in the x-direction:

x = (1/2)(vix+vfx)t

(12) = (1/2)(vix+(0))(0.35)

68.6m/s = vix

Answer and explanation;

According to twin studies attitudes may be genetically based, research has supported that Identical twins are more likely to share similar attitudes. Attitudes change as the result of behavior and not the other way around

Genetic factors may influence general dispositions and condition-ability that may influence formation of more specific attitudes. Controlled twin studies in US and Sweden reveal that identical twins share more similar attitudes than fraternal twins.

Atomic number=Proton count

Atomic mass=Proton count+ neutron count

Neuton Count=Atomic mass-Proton count

Proton count=Atomic number=27

Mass number=74

Neuton count= 74-27=47

Answer:

The advantage of Hyperloop is that it is a high-speed transport that does not pollute nature because it does not use fossil fuels.

Explanation:

Basically, Hyperloop is a transport system that works in a kind of aluminum capsule that circulates inside pneumatic tubes and can reach the 1,200 km / h mark. To better illustrate the idea, think of the cartoon "The Jetsons", where the characters used vacuum tubes to move around buildings. It is more or less that, only on a much larger scale: the initial idea is to take a trip from San Francisco to Los Angeles in about half an hour.

In addition to the high speed, the system is supplied with renewable energy and is still capable of generating a surplus of solar, wind and kinetic energy that can be sold to the public network, for example, to make the service more profitable. In short, Hyperloop will allow long distance travel to be made faster, safer, cheaper, immune to the climate and more sustainable than airplanes, cars or trains.

' C ' is the correct description of the graph.

As density =mass/volume

Mass is measured in kilogram & volume measured in m^ 3

So the correct statements are given

Density is derived unit of measurement.

Density is ratio of mass to volume

Density is physical property of object.

Of the following given choices;

The answer is; gravitational.

When the delivery man pushes the doorbell, he is utilizing mechanical energy. This energy is later converted to electrical energy that travels through a circuit to the inside of the house. An actuator then converts the electrical energy to sound that is heard inside the house.

Angle made by the light ray with the surface of mirror is given as

[tex]\theta_i = 90 - 20 = 70 [/tex]degree

now as we know as per law of reflection that

angle of incidence = angle of reflection

So here we can say that

[tex]\theta_i = \theta_r[/tex]

[tex]\theta_r = 70 degree[/tex]

now the total angle that reflected ray will rotate with respect to incident ray is known as angle of deviation

[tex]\delta =180 - \theta_i - \theta_r[/tex]

[tex]\delta = 180 - 70 - 70 = 40 degree[/tex]

so here reflected light will deviate by total angle of 40 degree fron its incident ray.

Answer:

C. 6.14 m

Explanation:

The maximum horizontal distance travelled by a projectile is given by:

[tex]d=\frac{v^2}{g}sin (2\theta)[/tex]

where

v is the initial velocity

[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity

[tex]\theta[/tex] is the angle of launch

From the equation, we see that the maximum range is achieved when the projectile is fired at [tex]\theta=45^{\circ}[/tex].

The dart in the problem has an initial velocity of

v = 7.76 m/s

Substituting into the formula, we find the maximum horizontal distance:

[tex]d=\frac{7.76^2}{9.8}sin (2\cdot 45^{\circ}) = 6.14 m[/tex]

Okay here initially child walks on the outer edge of the disc and then started to move inside

So here as the child and Merry go round is an isolated system so there is no external Torque on this system from outside

As here we can see there is external force acting on this system by the hinge of the Merry go round as well as due to gravity so we can not use momentum conservation to solve such type of questions.

But as we can say that there is no external torque on this system about the hinge point so we will use conservation of angular momentum for this system

Here as we know that

[tex]\tau = \frac{dL}{dt}[/tex]

where L = angular momentum

since here torque is ZERO

[tex]0 = \frac{dL}{dt}[/tex]

L = constant

so here we can write initial angular momentum of the system as

[tex]L = (I_1 + I_2)*\omega[/tex]

here we know that

[tex]I_1 [/tex] = moment of inertia of merry go round

[tex]I_2 [/tex] = moment of inertia of child

so here we can say

[tex](I_1 + I_2)* \omega_1 = (I_1 + I_2')\omega_2[/tex]

so here as the child moves from edge to inside the disc it moment of inertia will decrease because as we know that moment of inertia of child is given as

[tex]I_2 = mr^2[/tex]

here m = mass of child

r = distance of child from center

Since child is moving inside so his distance from center is decreasing

so here moment of inertia of child is decreasing as he starts moving inside

so final angular speed of merry go round will increase as child go inside

[tex]\omega_2 = \frac{(I_1 + I_2)*\omega}{(I_1 + I_2')}[/tex]

so here as

[tex]I_2' < I_2[/tex]

final angular speed will be more than initial speed as child moves inside

Answer:

Mass of the gold bar is 90.71 gram.

Explanation:

Given:

volume = 4.7 [tex]cm^{3}[/tex]

density = 19.3 [tex]\frac{g}{cm^{3}}[/tex]

To find:

mass = ?

Formula used:

density = [tex]\frac{mass}{volume}[/tex]

Solution:

density is given by,

density = [tex]\frac{mass}{volume}[/tex]

mass = volume × density

mass = 4.7 × 19.3

mass = 90.71 g

Mass of the gold bar is 90.71 gram.

Hello!

To answer this question we need to understand what Newton's Second and Third Laws of Motion are!

Second Law- States the accerlation of an object is dependent on two variables, the net force acting upon the object and the mass of the object.

Third Law- States that for ever action, there is an eual and opposite reaction.

The second law is important to our everyday life, because when you try to push something, it's easier for us to push it with a lighter mass. For example pushing an empty box is easier than pushing a full one. Same principal goes for a lot things in our daily life.

The third law is important to our everyday life, because action-reaction pairs affect everything in our life. One of the best examples of this can be see in human body movements!

Hope this helps you with your question.