Across what potential difference does an electron have to be accelerated in order to reach the speed v=3e7 m/s?

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.

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.

Answer:

  She will make the jump.

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.

First we will consider horizontal motion of stunt women

   Displacement = 77 m, Initial velocity = 28 cos 15 = 27.05 m/s, acceleration = 0

Substituting

   [tex]77= 27.05t+\frac{1}{2} *0*t^2\\ \\ t=77/27.05=2.85 seconds[/tex]

So she will cover 77 m in 2.85 seconds

 Now considering vertical motion, up direction as positive

    Initial velocity = 28 sin 15 = 7.25 m/s, acceleration =acceleration due to gravity = -9.8 [tex]m/s^2[/tex], time = 2.85

    Substituting

           [tex]s=7.25*2.85-\frac{1}{2}*9.8*2.85^2=20.69-39.80 =-10.11 m[/tex]

  So at time 2.85 stunt women is 10.11 m below from starting position, far side is 25 m lower. So she will be at higher position.

  So she will make the jump.

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:

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

Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.

(On edge) Sample Response: In nuclear fission, the mass of the original nucleus is greater than the mass of the products. The extra mass is converted to energy. In nuclear fusion, the total binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus. Extra energy is released during the reaction.

' C ' is the correct description of the graph.

Pressure at a given surface is given as ratio of normal force and area

so here force due to heel of the shoes is given as 80 N

and the area of the heel is given as 16 cm^2

so we can say

[tex] P = \frac{F}{A}[/tex]

here we have

F = 80 N

[tex]A = 16 cm^2 = 16 * 10^{-4} m^2[/tex]

[tex]P = \frac{80}{16 * 10^{-4}}[/tex]

[tex]P = 5 * 10^4 N/m^2[/tex]

so pressure at the surface due to its heel will be 5 * 10^4 N/m^2

Final answer:

The pressure exerted on the heel of the boy's foot is 5 N/cm².

Explanation:

To calculate the pressure exerted on the heel of the boy's foot, we can use the formula: Pressure = Force / Area. In this case, the force is the weight of the boy, which is 80 N. The area of the heel is given as 16 cm². Now we can plug these values into the formula:

Pressure = 80 N / 16 cm² = 5 N/cm².

Therefore, the pressure exerted on the heel of the boy's foot is 5 N/cm².

waters falling. it gets u stuck inside

wind blowing. makes u feel freezing

hope this helped

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:

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)

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]

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.

The answer for your question is true

Answer: True

Explanation:

Genes can be turned off and turned on based on the body function. The switching on and off of genes is a continuous process which takes place life long.

This turning off and on of genes is known as gene regulation which is responsible when the genes will be on and when the genes will be off.

The DNA in same it is the functional gene which makes the cell different. Hence, the given statement is True.

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.

Yes you are right but sometimes just because a number is  bigger doesnt always make it so.

When converted to the same units, 50 m/s is equivalent to 180 km/h, which is faster than 140 km/h.

To compare the speed of 50 m/s with 140 km/h, we need to convert them into the same units. We know that 1 m/s is equivalent to 3.6 km/h. Therefore, 50 m/s is equal to 50 imes 3.6 km/h, which is 180 km/h.

Comparing this with 140 km/h, we can see that 50 m/s (180 km/h) is indeed faster than 140 km/h.

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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Mimiwhatsup Answers: Deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus.

A star shines brightly due to nuclear fusion in its core, where the energy moves outward and radiates as light. Colors of stars relate to their temperature and size, and outburst events can significantly increase a star's shine. Gravitational lensing observed by telescopes can make stars appear brighter without an intrinsic change.

The cause of a star's bright shine is the nuclear fusion happening in its core. This process releases tremendous amounts of energy as the star's gravity pulls matter inward, causing the core's temperature and pressure to rise until fusion occurs. The energy produced by fusion then pushes outward, ultimately reaching the surface of the star and radiating into space as light, which we see as the star shining.

Stars shine in a variety of colors, which relate to their temperatures and sizes, where a blue star is typically hotter than a red star. However, the brightest shine of a star is observed when there are outburst events, such as a star engulfing a companion, which can greatly amplify its intrinsic brightness, like in the case of V838 Monocerotis.

Furthermore, gravitational lensing, which is observed by telescopes like Hubble, can also cause stars to appear to brighten. Though in this case, the star itself doesn't change intrinsic brightness, but rather the path of its light is altered to make it appear brighter from our perspective.

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:

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

Average velocity has two parts:  Its magnitude (size) and its direction.

Its magnitude is

(straight-line distance between start-point and end-point, regardless of the route that's actually followed from start to finish) divided by (time taken to travel from start to finish).

Its direction is

(direction from start-point to end-point)

Notice that straight from this definition, the average velocity of going around a full circle is zero, no matter how fast you traveled.  That's because the size of the  average velocity is calculated from the straight-line distance from start-point to end-point, and that's zero if you finish at the same point you started from.

Answer:

  Side of cube = 24 mm

Explanation:

   Usually gold price is represented for 8 g of gold = 300$

   Density of gold = 19.32 [tex]g/cm^3[/tex]

   Mass of gold for 10000$ = (10000/300)*8 = 266.67 g

   We have density = Mass/ Volume

   So volume = Mass/density = 266.67/19.32 = 13.80 [tex]cm^3[/tex] = 138000 [tex]mm^3[/tex]

   Volume of cube of gold = [tex]a^3[/tex], where a is the side of cube,

   So side of cube , a = [tex]\sqrt[3]{138000} =23.99 mm = 24 mm[/tex]

Your answer is B. Hope this helps! -John

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.

Answer:

zero.

Explanation:

The condition for an object to be in equilibrium is that there is no resulting force acting on it, in other words, that the force on the object is zero:

[tex]F=0[/tex]

and by Newton's second law we know that

[tex]F=ma[/tex]

where [tex]m[/tex] is the mass of the object, and [tex]a[/tex] its acceleration.

So combining the two things:

[tex]F=ma=0[/tex]

⇒[tex]ma=0[/tex], This equation is fulfilled when [tex]a=0[/tex]

Wich tells us that for the the block to be in equilibrium, the acceleration must be zero:

[tex]a=0[/tex]

If a block is in equilibrium the magnitude of the block's acceleration is 0m/s²

According to Newton's second law, the force acting on a body is equal to the product of its mass and acceleration.

Mathematically F = ma where:

m is the mass of the object

a is the acceleration of the object

If a block is in equilibrium, the magnitude of the force acting on the block will be 0, that is F = 0

Substituting F = 0 into the formula above to calculate the acceleration;

F = ma

0 = ma

Swap sides

ma = 0

a =0/m

a = 0m/s²

This shows that if a block is in equilibrium the magnitude of the block's acceleration is 0m/s²

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it got to be jumping jacks that all i got

Answer:

Explanation:

A common activities where cardiovascular and strength training are together is during Construction tasks. In this context, aerobic and anaerobic exercises are present.