The brick wall of thermal conductivity0.75 W/m ° C) of a building has dimensionsof 2.7 m by 11 m and is 7 cm thick. How much heat flows through the wall ina 17.5 h period when the average inside andoutside temperatures are, respectively, 30°Cand 7°C?Answer in units of MJ.

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Answer:

True they can influence you and have an effect on your mental and emotional health.

Explanation:

Have you ever played Farckel.

Answer:

The velocity is 2661.5 m/s.

Explanation:

Radius, horizontal distance, d = 309 km

height, h = 25 km

acceleration due to gravity on moon, g =3.71 m/s^2

Let the time taken is t and the horizontal velocity is u.

horizontal distance = horizontal velocity x time

309 x 1000 = u t .... (1)

Use second equation of motion in vertical direction.

\(h = u_yt +0.5 gt^2\\\\25000 = 0 + 0.5\times 3.71\times t^2\\\\t =116.1 s\)  

So, put in (1)

309 x 1000 = u x 116.1

u = 2661.5 m/s

Apart from the two electrodes, several factors can affect the voltage in an electrical circuit. These factors such as wire gauge, component ratings, load requirements, and temperature considerations.

These factors include:

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A. The vibrations of the fields are perpendicular to the direction in which the wave moves.

An electromagnetic wave moves through electric and magnetic fields, and the movement of the wave can be described as the vibrations of the fields being perpendicular to the direction in which the wave moves, as in option A.

Electromagnetic waves have many applications, including the transmission of information and energy, and they are also used in other technologies such as radio, television, hospitals, wireless communications, and so on. Other different rays, such as microwaves, infrared radiation, visible light, ultraviolet radiation, etc., are used in different fields, such as X-rays for imaging, etc.

Hence, an electromagnetic wave moves through electric and magnetic fields, and the movement of the wave can be described as the vibrations of the fields being perpendicular to the direction in which the wave moves, as in option A.

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Answer:

currents which circulate in conductors like swirling eddies in a stream in electromagnetic series....

The time will take a skateboard and dog with force 9N to stop the skateboard and dog is 8 seconds.

The force is defined as the push or pull of an object. The force equals the mass and acceleration of the object obtained from Newton's second law. Acceleration defines the change in velocity by the time taken. The force is defined as the rate of change of momentum and time. Momentum is defined as the product of mass and velocity and the unit of momentum is Kg.m/s.

From the given,

mass of dog (m) = 24 kg

The initial speed of dog (u) = 3 m/s

mass of skateboard and dog = 3 + 24 = 27 kg.

The final speed of dog (v) = 0 m/s

Force = 9N

time =?

F = dp/dt, rate of change of momentum and time.

F(dt) = dp

dt = (dp)/F

    =(Pf - Pi)/F

Pf is the final momentum and Pi is the initial momentum.

Pi = m×v = 24×3 = 72 kg.m/s²

Pf = m×v = 27×0 =0 kg.m/s²

dt = (0-72)/9

   = 8s

Thus, the time taken to stop the skateboard and dog is 8s.

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In our lives or possibly in countless lifetimes, non-renewable energy sources will deplete or cease to exist. Coal, petroleum, & natural gas make up the majority of non-renewable energy sources.

By most standards, biofuels, oil, and natural gas—cause significantly more damage than renewable energy sources, including air pollution, ill effects on human health, habitat loss for species, water use, land use, the global warming emissions.

Coal, nat gas, oil, & nuclear energy are examples of nonrenewable energy sources. Since we now depend on these resources for the majority of our energy, once they are depleted, they could be replaced, which poses a serious issue for humanity.

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Answer:

Explanation:

First, we need to convert the velocity to meters per second:

60 mph = 88.5 ft/s = 26.82 m/s

Now we can use the formula:

v = at

where v is the final velocity, a is the acceleration, and t is the time.

Rearranging this formula, we get:

t = v/a

Substituting the values, we get:

t = 26.82 m/s / 13.5 m/s^2 = 1.987 seconds (rounded to three decimal places)

Therefore, it will take approximately 1.987 seconds to reach 60 mph with an average acceleration of 13.5 m/her/sec.

The vehicle will hit 60 mph in 7152 seconds (or about 1 hour and 59 minutes) with an average acceleration of 13.5 m/hr/sec.

The definition of acceleration is. The pace at which velocity changes with regard to time. Because it has both amount and direction, acceleration is a vector variable. It is also the second derivative of location in relation to time, or the first derivative of motion in relation to time.

We can begin by converting the final velocity to meters per second (m/s) as the initial acceleration is given in m/hr/sec.

60 mph = 26.8224 m/s (1 mile = 1.60934 km, 1 hour = 3600 seconds)

Now, we can use the formula:

v = u + at

Where,

v = final velocity = 26.8224 m/s

u = initial velocity = 0 m/s (car starts at rest)

a = acceleration = 13.5 m/hr/sec = 0.00375 m/s^2 (convert from m/hr/sec to m/s^2)

t = time taken to reach the final velocity

Substituting the values, we get:

26.8224 = 0 + (0.00375)t

t = 26.8224 / 0.00375

t ≈ 7152 seconds

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Answer:

the required minimum thickness is 179.19 nm

Explanation:

Given the data in the question;

Refraction index of air n₁ = 1

Refraction index of sheet n₂ = 1.49

Refraction index of film n₃ = 1.62

wavelength of green light λ = 534 nm

In the data given, n₂ > n₃

so, this case has no pie-phase shift,

the condition for constructive interference will be;

mλ = 2Ln₂

L = mλ / 2n₂

so we substitute

L = m(534) / 2( 1.49 )

L = m( 534/ 2.98 )

L = m( 179.19 nm )

so for minimum value of L,

let m = 1

such that, L\(_{min\) will be;

L\(_{min\) = 1 × ( 179.19 nm )

L\(_{min\) = 179.19 nm

Therefore, the required minimum thickness is 179.19 nm

The angular velocity in radians per second, given that Microwave ovens rotate at a rate of about 5 revolutions per minute (rpm) is 0.50 radians per second

The angular velocity (in radians per second) can be obtained by simply converting 0.08 revolution per second to radians per second. This is obtained as illustrated below:

1 revolution per second = 2π radians per second

Therefore,

0.08 revolution per second = 0.08 × 2π

Recall

Pi (π) = 3.14

Thus,

0.08 revolution per second = 0.08 × 2 × 3.14

0.08 revolution per second = 0.50 radians per second

Thus, we can conclude that the angular velocity (in radians per second) is 0.50 radians per second

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The tension T₁ on the left side of the rope is 698 N.

Equilibrium is a State of balance in which opposing forces are balanced, of when there is no net change in system. It is a State of rest or balance due to the equal action of opposing forces.

\($$From equilibrium along $x$ direction$$\begin{aligned}T_1 \sin 15 & =T_2 \cos 10 \\\frac{T_1}{T_2} & =\frac{\cos 10}{\sin 15} \\T_1 & =3.8 T_2\end{aligned}\)

\($$From equilibrium along y direction$$\begin{aligned}T_1 \cos 15+T_2 \sin 10 & =m g \\\left(3.8 T_2\right) \cos 15+T_2 \sin 10 & =(72)(9.8) \\T_2 & =\frac{(72)(9.8)}{(3.8) \cos 15+\sin 10} \\& =183.55 \mathrm{~N} \\& =184 \mathrm{~N}\end{aligned}\)

\($$From equation,$$\begin{aligned}T_1 & =3.8 T_2 \\& =3.8(183.55 \mathrm{~N}) \\& =698 \mathrm{~N}\end{aligned}$$\)

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Complete question:

A 72 Kg Man Is Being Pulled Away From A Burning Building As Shown In The Figure. T1= 15 Degrees On The "Y" Access T2= 10....

Calculate the tension T1 on the left side of the rope, in newtons, if the man is in static equilibrium.

Calculate the tension T2 on the right side of the rope, in newtons, if the man is in static equilibrium.

The resultant of two displacement vectors having opposite directions is the difference of the two displacements, having the same direction as the smaller vector.

When two displacement vectors have opposite directions, it means they are pointing in opposite ways. In other words, one vector is in the opposite direction of the other. To find the resultant of these vectors, we need to subtract one vector from the other.

If we consider two displacement vectors, let's say vector A and vector B, and they have opposite directions, we can represent them as A and -B.

To find the resultant, we subtract vector B from vector A: A - (-B) or A + B.

The resultant will have the same direction as the smaller vector. This is because when we subtract a larger vector from a smaller vector, the resultant will have the direction of the smaller vector.

Therefore, the correct option is: "The resultant is the difference of the two displacements, having the same direction as the smaller vector."

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The current flowing in the 2Ω and 1Ω is 1.14 A and the current flowing in the 3Ω and 4Ω is 0.286 A.

The value of the current in each resistor is calculated by applying Kirchoff voltage law as follows;

The total voltage in loop 1 is calculated as;

2 + 4 - I₁R₁ - (I₁ - I₂)R₂ - I₁R₃ = 0

6 - 2I₁ - 3(I₁ - I₂) - 1₁ = 0

The current flowing in loop 2 is calculated as;

I = V/R

I₂ = ( 6 V - 4 V ) / (3 + 4)

I₂ = 0.286 A

The value of the current flowing in loop 1 is calculated as;

6 - 2I₁ - 3(I₁ - I₂) - 1₁ = 0

6 - 2I₁ - 3(I₁ - 0.286) - 1₁ = 0

6 - 3I₁ - 3₁ + 0.858 = 0

-6I₁ = -6.858

I₁ = 6.858 / 6

I₁ = 1.14 A

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(a) The value of the steady state charge in the circuit is 3 C.

(b) The steady-state current ,in an LRC-series circuit is 5.3 A.

The value of the steady state charge in the circuit is calculated as follows;

Q = CV(max)

Q = 0.1 x 30

Q = 3 C

I = V/R

Vrms = 0.7071 x V(max)

Vrms = 0.7071 x 30

Vrms = 21.21 V

I = Vrms/R

I = 21.21/4

I = 5.3 A

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Physical properties of matter tells us what a substance is or what a substance can do when it is not undergoing a chemical change.

These properties are observable with our senses or instruments or some pieces of apparatus.

Some of these properties are :

Color

Odor

hardness

texture

boiling point

Melting point

density

viscosity

They differ from chemical properties which are shown by the reaction of a substance with another.

The best, most helpful observation you can make is to LOOK steadily and squarely at the PICTURE of the stack.

For some nefarious reason, you decided to prevent us from doing that.

Answer:    

2 : A large storm

Explanation: I hope this helps

Answer:

EXAMPLE: If the California interstate went all the way to Jupiter and you could drive there going 65 mph, it would take you almost 850 years.

Answer:

Symbol: I unit: A

Explanation:

the formula for current is I = v/r

I: Current

V: voltage

R; Resistance

Symbol and unit of measurement are used for the electric current are symbol: I; unit: A

"Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere. Electrons are minute particles that exist within the molecular structure of a substance. Sometimes, these electrons are tightly held, and the other times they are loosely held."

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Answer:

If wire have high resistance it will heat up.

Wire will have a small magnetic field around it. if voltage is high corona will be formed around wire.

Answer:

A physical change is the change to the physical properties of an object.

Explanation:

As an example if I take a piece of paper and cut it in half that would be a physical change. Water freezing into ice is also a physical change.

Answer:

none of those are right, its technically 96.5%. so i would say 97% is your best bet because thats closest and it just rounds up :)

Explanation:

The best example of Newton's third law of motion is, When a passenger stepped from a boat to the shore, the boat moved away from the shore. Thus, option C is correct.

Sir Issac Newton gives three laws of motion. The first law states that an object remains at rest or in continuous motion unless an external force acted on it. The second law stated that the force is directly proportional to the acceleration of the object. Newton's third law states that, for every action, there is an equal and opposite reaction.

From the given, Newton's third law is applicable, When a passenger stepped from a boat to the shore, the boat moved away from the shore. This shows the action and reaction of the boat and shore.

Thus, the ideal solution is option C.

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Answer:

Explanation:

The pressure transmitted in the hydraulic system can be found by using the formula

\(p = \frac{f}{a} \\ \)

f is the force

a is the area

From the question we have

\(p = \frac{35}{5} \\ \)

We have the final answer as

Hope this helps you

Answer:

\(a=-8.89\ m/s^2\)

Explanation:

Initial velocity, u = 85 m/s

Final velocity, v = 45 m/s

Time, t = 4.5 s

We need to find the acceleration of the dragster. The rate at which the velocity of an object changes is called the acceleration of an object. It can be given by :

\(a=\dfrac{v-u}{t}\\\\a=\dfrac{45-85}{4.5}\\\\a=-8.89\ m/s^2\)

So, the acceleration of the dragster is \(8.89\ m/s^2\) and it is deaccelerating.

Answer:

False

Explanation:

The primary difference is that electromagnetic waves can propagate through a vacuum or empty space, while mechanical waves require a physical medium to transmit energy.

A primary difference between an electromagnetic wave and a mechanical wave is the medium through which they propagate.

Electromagnetic waves can propagate through a vacuum or empty space without requiring a material medium. They are generated by the oscillation and interaction of electric and magnetic fields.

Examples of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves can travel through space, air, or other materials, as they do not rely on physical particles to transmit energy.

On the other hand, mechanical waves require a physical medium to propagate. They are disturbances that travel through a material medium, transferring energy from one location to another. Mechanical waves rely on the interaction and displacement of particles within the medium to transmit energy.

Examples of mechanical waves include sound waves, water waves, seismic waves, and waves on a string. These waves cannot travel through a vacuum as they depend on the physical presence and interaction of particles within the medium.

In summary, the primary difference is that electromagnetic waves can propagate through a vacuum or empty space, while mechanical waves require a physical medium to transmit energy.

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Option D. continental shelf

Continental shelf is a part of a continent that is submerged under an area of ​​relatively shallow water known as a shelf sea.

It is given in the question, that the shelf of undersea land reaches 200 meters and it also extends out from the shoreline. This condition is only possible when a structure is submerged, and such submerged region can only be called as continental shelf.

On the other hand guyots is a underwater volcanic mountain and deep-sea trenches are the the long narrow lowerings in the ocean floor with the depth upto 6000 meters. And abyssal plains are the underwater ocean floors which cannot be found at the depth of 200 meters.

Therefore continental shelf is used to described as a shelf of undersea land reaching a depth of about 200 meters (656 feet) and extending out from the shoreline.

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