what direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?

Answer:

Electric force is caused by electric charge. Electric charge is a property of the bits of matter within atoms. Electric force can cause matter to attract or repel because there are two kinds of charge – positive and negative charge.

The effects of electric force can be summarized as the law of electric charge: Pieces of matter with the same kind of charge repel each other. Pieces of matter with the same kind of charge attract each other. 2 objects with a positive charge repel each other, as do 2 objects with a negative charge.

Most objects are made of matter with equal amounts of positive and negative charge. Objects with the same # of positive and negative charges are electrically balanced, or neutral. Electric force is observed only when the balance of charge on objects is disturbed.

An electric charge on an object that causes the object to attract or repel other objects is called static electricity. The adjective static describes something that does not move. Charges on an object are called static electricity to contrast then with the moving charges in an electric current.

Answer:

its  A. because since heat energy means thermal i think it is A and also When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Explanation: your welcome and i hope its right

The position of a ball as a function of time is given by x=(4.8m/s)t (−9m/s2)t2 . part a what is the initial position of the ball is 0 meters.

To find the initial position of the ball, we need to determine the value of x when t is equal to zero. The initial position represents the position of the ball at the starting point, which corresponds to t = 0.

Given the equation x = (4.8 m/s)t - (9 m/s^2)t^2, we can substitute t = 0 into the equation:

x = (4.8 m/s)(0) - (9 m/s^2)(0)^2

x = 0

Therefore, the initial position of the ball is 0 meters.

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The reaction constant or variable (1). Variable, because the slope changes as a function of time is the correct option.

Option 1 is the best choice given the available data, as the reaction's rate is varied as a result of the slope changing with time. When discussing a chemical reaction's rate, it is important to note that as the concentrations of reactants and products change over time, the rate can also fluctuate. The rate of a reaction is frequently calculated from the slope of a plot of reactant or product concentration vs time. However, this slope might change during the course of a reaction, indicating that the rate is variable rather than constant.

Therefore, the correct option is (1).

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Answer:

Length of Orbit

Explanation:

The surface temperatures decreases with increasing distance from the sun. Venus is an exception because its dense atmosphere acts as a greenhouse and heats the surface to above the melting point of lead, about 880 degrees Fahrenheit (471 degrees Celsius).

Hopefully this helps!

The amount of wavelength of light thick is the thumbnail x/y.

Given:

Wavelength of light= x

Thickness of thumbnail= y

The amount of wavelength thick the thumbnail is x/y

What is wavelength?

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The main answer is that Carrie has the load that is easier to lift.

The explanation is that the weight of an object is directly proportional to its volume, which is determined by its length, width, and height.

Since Mary has a single piece of lumber that is 2.44 m long, it has a greater volume than Carrie's two pieces that are only 1.22 m long. Therefore, Mary's load will be heavier and more difficult to lift.

In summary, the length of the lumber affects its weight, and since Mary has a longer piece than Carrie, her load is heavier and more difficult to lift.

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Answer:10cm x 25cm

Explanation:

i got it wrong so you could get it right

The magnitude of the torque about the bolt due to the worker and the weight of the beam is 13,798.4 Nm

The length of the steel = \(r_{2}\) = 4.4 m

The mass of the steel= \(m_{1}\) = 500 kg

The mass of the worker = \(m_{2}\) = 70 kg

Let , the total torque = \(\tau_{t}\)

The centre of gravity = \(r_{1}\)

                                   =4.4/2

                                   = 2.2

\(\tau_{t} = \tau_{1} +\tau_{2}\\\\\tau_{t} = F_{1}r_{1} + F_{2}r_{2} \\\\\text{We know that},F = mg \\\\\tau_{t} = m_{1}gr_{1} + m_{2}gr_{2}\\\\\tau_{t} = (500* 9.8* 2.2) +(70*9.8* 4.4)\\\\\tau_{t} = 13,798.4 Nm\)

The magnitude of the torque about the bolt due to the worker and the weight of the beam is 13,798.4 Nm.

The complete question is:

A 4.40-m-long, 500 kg steel uniform beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the bolt due to the worker and the weight of the beam?

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Answer:

lux

Explanation:

I guess because I think I have read it somewhere

The requried measurement unit of luminous flux is lumen (D).

Unit of measurement is defined as every entity having its measures in dimensions, weight, and time. Such as for length we have a meter, for liquid we have liters, and so on.

Here,
The measurement unit of luminous flux is lumen (D). Luminous flux is the measure of the total amount of visible light emitted by a light source per unit of time, which is perceived by the human eye as brightness. It is a measure of the quantity of light energy emitted by a source in all directions per unit of time. Lumen is defined as the amount of light emitted by a light source in a solid angle of one steradian, within a unit of time.

Thus, the requried measurement unit of luminous flux is lumen (D).

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Answer:

Yes, young rocks typically occur around volcanoes since they are closer to the crate, thus the magma is beginning to cool down to form rocks or it has recently cooled down.

Explanation:

yes

new forms of extrusive igneous rocks will be created as lava cooling and hardening will create new and young rocks

Answer:

Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another.

Explanation:

Speed is a scalar quantity because it is only represented by magnitude not a direction.

Answer:

Explanation:

constant speed is where the speed is the same throughout and instantaneous speed is speed given at any moment and average speed is a total distance traveled divided by the amount of time it took to travel it.

Answer:

Average speed is a measurement of velocity over a period of time.

Constant speed refers to your velocity at any point in time or period

Answer:

C is the correct answer.

Explanation:

the light contributes to the changing seasons because the shorter the day it is most likely winter or fall and the longer the day it is most likely summer or spring

The surface of a concave mirror can be best described as reflective and curved inwards. The reflective surface of a concave mirror is curved inwards.

Due to this curved surface, parallel rays of light incident on the mirror converge at a single point on the axis of the mirror. This point is called the principal focus of the mirror. A concave mirror is also known as a converging mirror because it can converge light rays to a single point. The reflection produced by a concave mirror can also be referred to as "converging reflection."

The image produced by a concave mirror is virtual, enlarged, and upright when the object is located beyond the focus of the mirror.The surface of a concave mirror is highly reflective, and light can be focused by it. Therefore, concave mirrors are often used in telescopes, microscopes, and other optical instruments.

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Answer:

A -- 240

Explanation:

It takes around 270 to cycle more newtons up a hill

Answer:

\(\vec{B}_{y}=6T\)

Explanation:

Here we can use the Lorentz force equation.

\(\vec{F}_{B}=q(\vec{v}\times \vec{B})\)

We know:

So we will have:

\( (0.4i-20j+12k)=2((2.0i+4.0j+6.0k) \times (ai+bj+ck))\)  

Let's solve the cross product, knowing that x component of B is 0, it means a=0.

\( (0.4i-20j+12k)=2((2.0i+4.0j+6.0k) \times (0i+bj+ck))\)  

\( (0.4i-20j+12k)=2((4c-6b)i-2cj+2bk)\)  

Comparing the k component we have:

\(12=2b \)

\(b=6 \)            

If we see b is the y-component of the magnetic field, therefore \(\vec{B}_{y}=6T\)

I hope it helps you!

-0.033 units

According to Lorentz force law, the magnetic force, F, on a moving charge, q, moving with a velocity, v, in a magnetic field, B, is given by;

F = q v x B   ----------------(i)

Where;

F, v and B are vectors. Therefore, equation (i) represents a vector product of the velocity and magnetic field vectors.

From the question;

v = (2.0i + 4.0j + 6.0k)m/s

F = (0.4i - 20j + 12k)N

q = 2.0C

Let the magnetic field vector be given by;

B = ai + bj + ck               ---------------------(*)

Where;

a, b and c are the magnitudes of the x, y and z components of the magnetic field.

Substitute the values of F, v, B and q into equation (i) as follows;

(0.4i - 20j + 12k) = 2.0(2.0i + 4.0j + 6.0k) x (ai + bj + ck)

Expanding the second bracket gives

(0.4i - 20j + 12k) = (4.0i + 8.0j + 12.0k) x (ai + bj + ck)          ---------------(ii)

Solving the right hand side of equation (ii) which is the vector product gives;

                                       |                                       |

                                       |  i               j                 k |

 (0.4i - 20j + 12k) =        |  4.0         8.0         12.0  |

                                      |  a             b                 c  |

                                      |                                        |

(0.4i - 20j + 12k)  = (8.0c - 12.0b)i - (4.0c -12.0a)j + (4.0b - 8.0a)k      ----(iii)

Comparing both sides of equation (iii) gives the following three equations;

0.4 = 8.0a - 12.0b           --------------------(iv)

-20 = 4.0c - 12.0a          ---------------------(v)

12 = 4.0b - 8.0a             ----------------------(vi)

From the question, it is given that the x component of the magnetic field is equal to zero. Now, recall that from equation (*) above, the magnitude of the x-component of the magnetic field is given as a

Therefore;

a = 0

To get the y component, which is b, substitute the value of a = 0 into equation (iv) as follows;

0.4 = 8.0(0) - 12.0b

0.4 = 0 - 12.0b

0.4 = - 12.0b

Solve for b;

b = \(\frac{-0.4}{12.0}\) = -0.033

Therefore the y component of the magnetic field is -0.033 units

Answer:

It depends on 2 factors

the nature of the materials

the normal force.

Explanation:

It depends on 2 factors

the nature of the materials that are in friction and the treatment that they have followed. This factor is expressed by a numerical value called the coefficient of friction or friction.

the force exerted by one body on the other, that is, the normal force.

Note that:

Aluminium is good conductor of heat because of its high thermal conductivity

The solar cooker cooks food with the heat is energy absorbed from sunlight. The aluminium foil is used as a reflector in the solar oven so as to gather/trap sufficient sunlight into the box inorder to be used by the cooker.

Therefore, the presence of aluminium/tin foil in the solar oven will help speed up the rate at which heat is trapped, hence the rate at which the food gets cooked.

More tin/ Aluminium foil means more reflection of sunlight in the solar oven.

Answer:

Below

Explanation:

The two PARALLEL resistors equal:    1 / (1/16 + 1/16) = 8 Ω

V = IR        =    .7 (8) = 5.6 v

Answer:

2/5 v

Explanation:

Use conservation of momentum

originally    mv = 2m v

  after the crash   mv is still the same (2mv)

        but the mass is now   5m x      where x is the new velocity

                   2mv = 5 mx

                  x = 2/5 v

The momentum of two objects in a collision is conserved. Hence, the total initial momentum is equal to the final momentum of the coupled mass. Here the final velocity will then be 2/5 v.

Momentum of a moving object is the product of mass and velocity. It is a vector quantity with direction and magnitude. The total momentum of two colliding bodies is equal to the total final momentum after collision.

Let m1 and m2 be the masses and v1 and v2 be the final velocities. Vt be the velocity of the coupled mass.

Then, m1 v1 + m2 v2 = (m1 + m2) Vt

Given, mass of cart 1 = 2m

cart 2 = 3m

velocity of cart 1 = v

cart = 0 since it was at rest.

Then, 2m v + 0 = (2m + 3m) Vt

Vt = 2/5 v

Therefore, the final velocity of the couple of carts will be 2/5 v.

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Answer: Plasma is made up of groups of positively and negatively charged particles but particles of a gas are mostly uncharged.

Explanation:

Because unlike ordinary gases, plasmas are made up of atoms in which some or all of the electrons have been stripped away and positively charged nuclei, called ions, roam freely.

Answer:

attached image

Explanation:

Answer:

Please see the answers in the picture attached below.

Explanation:

Hope this answer can help you. Have a nice day!

Answer:

a = 3 m/s^2

Explanation:

Vi = 10 m/s

Vf = 40 m/s

t = 10 s

Plug those values into the following equation:

Vf = Vi + at

40 = 10 + 10a

---> a = 3 m/s^2

The car is traveling with an initial velocity of 10 m/s, a final velocity of 40 m/s in the time period of 10 seconds, then the acceleration of the car is 3 m/s².

Acceleration describes a change in an object's velocity. By accelerating, decelerating, or changing direction of motion, an object's velocity may change.

An apple falling to the ground, the moon orbiting the earth, and a car stopping at a set of traffic lights are a few examples of acceleration. With the aid of these illustrations, we may better see that acceleration occurs whenever a moving object modifies its direction, speed, or both.

The given values according to the question are,

Initial velocity, u = 10 m/s

Final velocity, v = 40 m/s and,

Time, t = 10 seconds.

Use the equation of motion to find the acceleration,

v = u + at

40 = 10 + (a)10

a = 30/10

a = 3 m/s².

Hence, the acceleration of the car is 3 m/s².

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Answer: 4.5 billion years

Explanation:

Some of the water molecules in your drinking glass were created more than 4.5 billion years ago, according to new research.

That makes them older than the Earth, older than the solar system — even older than the sun itself.