An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second? The answer is 1,900 MJ but I need to know how to get that.

If your friend's outstretched hands are at distance d = 1.50 m above the ground, (a) work Wg does the gravitational force do on the book as it drops to her hands 167J, b) -167J, c) 196J, d)29J, e)167J, f)-167J g)296J, and h) 129J

a)  Work = mg(Ac)

              = 2 × 9.8 × (10 - 1.5) = 167j

b) ΔU = Ubc - Uab = Mg(bc) - Mg(ab)

          = mg(bc - ab)

           = 2 × 9.8 (1.5 - 10) = -167j

c) Potential energy at reach point v = mg(AB) = 2 × 9.8 × 10 = 196J

d) Potential energy at reach point U = mg (bc) = 2 × 9.8 × 1.5 = 29.4j

e) Total work wg = mg (ac) = 2 × 9.8 × 3.5 = 167j

f) ΔU = -wg = - 167j

g) ui = mg × AB + 100 = 196 + 100 = 296j

h) uf = mg × bc + 100 = 29.4 + 100 = 129j

Given the possibility of motion, gravitational forces can sort phases of various densities. Although high temperatures are not anticipated for the early Earth, widespread melting is one possibility. Sorting in response to the outgassing of deeply buried ices is a more feasible scenario. Such processes would have altered the moment of inertia, necessitating an adjustment to the angular velocity. Friction opposes gravitational settling and prevents it from being conservative, which makes quantification dubious. The ensuing phase separation and angular momentum alterations would not need to be as extensive as commonly believed if an iron protocore existed.

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The distance before it falls back to the earth is 8.5 * 103 km. Option B

We know that the escape velocity has to do with the velocity that has to be supplied to a material so that the material can be able to escape from the earth's gravitational pull. Let us recall that the whole earth is a large gravitational field. If we throw an object up then the object would have to certainly fall doen to the ground under the influence of gravity.

It is therefore clear that gravity is the force that draws any object that  goes upwards down back to the ground. Given that we have been told here that the speed is  one-half of the escape speed, then then the magnitude of the speed is 5590.3 m/s.

Given that;

v^2 = u^2 - 2gh

v = final velocity

u = initial velocity

g = acceleration due to gravity

h = height

Then;

u^2 = 2gh

h = u^2/2g

h = ( 5590.3)^2/2 * 9.8

=  8.5 * 103 km

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1.25 cm is the height of the image. 160 cm separates a converging lens with such a 40 cm focal length from a diverging lens with the a -40 cm focal length. The converging lens is 60 cm away from a 2.5 cm tall item.

A lens that conforms a parallel source beam of light is known as a converging lens. One kind of converging lens is a double convex lens. Converging Lens A lens that separates a parallel light beam is known as a diverging lens. Diverging lenses include those that are double concave.

For the diverging lens, this image height corresponds to object height. We obtain h ′D=(20cm40cm)(5.0cm)=1.25cm again for diverging lens as a result.

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5.00 × 10-3/K is the coefficient of thermal expansion of the material from which the rod is made as it increases its length to 2.0005m

The coefficient of thermal expansion explains how an object's size varies when temperature changes. In particular, it measures the fractional size change per degree change in temperature at constant pressure, where lower coefficients denote a reduced propensity for size change.

The propensity of matter to alter shape, volume, and area in reaction to a change in temperature is known as thermal expansion. The average molecular kinetic energy of a substance has a monotonic relationship with temperature.

Use the equation for linear thermal expansion ΔL=αLΔT Δ L = α L Δ T to calculate the change in length, ΔL .

Get your rod hot enough to achieve, say, 1% linear thermal expansion.

The rod's dimension has increased to 1.01 units.

The rod is 1.030301 times its original size, or 1.013 larger than it was before heating.

This equals 1.03 when rounded to three major figures. In other words, its volume is 3% higher than that of the cold specimen.

The linear expansion is tripled, or 3%, by the volumetric expansion.

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Complete question:

A rod has a length 2.0000 m at 20.0°C. The length of the rod increases to 2.0005 m when the temperature increases to 40.0°C. What is the coefficient of thermal expansion of the material from which the rod is made?

The new rotational inertia or final moment of inertia of the girl is I₀ / 4.

option D is the correct answer.

Rotational inertia is a property of any object which can be rotated.

Rotational inertia or moment of inertia of an object is a measure of the resistance of an object to changes in its angular velocity.

Based on the law of conservation of angular momentum, the formula for her new rotational inertia is given as;

I₀ω₀ = I₁ω₁

where;

The given parameters include,

initial angular velocity = ω₀

final angular velocity = 4ω₀

initial moment of inertia = I₀

The final moment of inertia of the girl is calculated as

I₁ = ( I₀ω₀ ) / (ω₁)

I₁ = ( I₀ω₀ ) / (4ω₀)

I₁ = I₀ / 4

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The maximum torque on the wire is 392.3 µN·m and the range of potential energy is -392.3µN·m(minimum) to +392.3µN·m(maximum)

Torque: Torque is a measure of the force that can cause an object to rotate about an axis. It is a vector quantity.

Given that,

diameter D=20cm

Radius r =10cm

magnetic field B =2.5mT

current I=5A

Torque= n×B

           =nBsinФ

torque=nB= NIAB

                 = 1×5×π×[tex]10^{2}[/tex]×[tex]10^{-4}[/tex]×2.5×[tex]10^{-3}[/tex]

                 = 39.23×[tex]10^{-5}[/tex]

                 = 392.3µN·m

minimum potential energy= -nB= -392.3µN·m

maximum potential energy =+nB= +392.3µN·m

Therefore the maximum torque on the wire is 392.3 µN·m when is placed in an uniform magnetic field of 2.50mT and the range of potential energy is -392.3µN·m(minimum) to +392.3µN·m(maximum)

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Answer:

copy and complete this diagram so that the system is in equilibrium

With respect to stellar spectra Doppler shifts in spectral lines give clues to the motions of stars.

The spectral lines of an element can be used by astronomers to determine the element's temperature as density within the star. The spectral line may also be used to display the star's electric flux. The width of the line may be used to gauge how rapidly the material is moving. We can learn something about stellar winds from this.

Dark bands in a broad band can be used to identify components, and it can also reveal an object's temperature: The spectrum has more green, blue, and violet hues as the temperature rises. The spectrum of relatively cool objects is dominated by deep red or red and yellow.

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The temperature of two main-sequence stars is the same. Star B is two times further away than star A if star A is four times more brilliant.

The temperature and brightness of a main-sequence star depend on its mass. Bigger is always hotter and brighter. A star with ten times the mass of the sun contains nuclear energy. The brightness is 3000 times that of the sun.

Even stars with the same temperature inevitably have different luminosities. As an illustration, consider stars A and E, which have the same temperature but differ in luminosity.

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Zach's apparent weight before the elevator starts breaking is 686 N.

Zach's apparent weight while the elevator starts breaking is 966 N.

Given that, mass of Zach = 70 kg

His weight W = mg = 70* 9.8 = 686 N

If the elevator is going down at a constant velocity then, acceleration is zero and the apparent weight before braking is 686 N.

v = u + a * t

where,

t = Time taken

u = Initial velocity

v = Final velocity

a = Acceleration

Making a as subject from the above equation,

Acceleration a = (v - u)/t = (0-12)/3 = -4 m/s²

While the elevator is braking it has acceleration -4 m/s².

W = m ( g - a) = 70 (9.8 - (-4)) = 70(9.8 + 4 ) = 966 N

The apparent weight of Zach is 966 N.

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Air resistance is hardly noticeable. true regarding the 0.09-kilogram component. This causes 0.01kg to land farther from the launch site than 0.09kg did.

0.09kg will move to the west due to momentum conservation (opposite of 0.01 kg). Additionally, since both are at the same height above the ground, it will take them equal amounts of time to descend to the ground.

Allowing v to be the speed of 0.01 kg, which means that the speed of 0.09kg will be smaller than 0.01 kg,

0.01v - (0.09)V = 0

V = 0.01 v/ 0.09 = 0.111v

The speed of 0.09 kg = 0.111v

The speed of 0.09 kg is less than 0.01kg.

Because of this, 0.01kg hits the ground farther from the launch point than 0.09kg did.

The amount of resistance in an electrical circuit represents the resistance to current flow. The Greek letter omega (), which represents resistance, represents ohms. German physicist Georg Simon Ohm (1784–1854), who investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance known as an ohm.

Resistance measurements are typically performed in order to evaluate the health of a component or a circuit.

Current flow is inversely correlated with resistance. Conductor damage from corrosion or burning could be one of several potential causes if it is extremely high.

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A block with mass 4 kg glides at a speed of 2 m/s across a horizontal, frictionless surface. By compressing a spring in its journey, it comes to rest.  The spring has a 0.2 m compress.

But when you exert force on the battery, the charged particles begin to function, transforming the potential energy into kinetic energy. Similar to this, when you turn on a light, the potential energy goes through your wiring and is transformed into light and heat, both of which are examples of kinetic energy.

Given that,

Block weight: 4 kg

Speed = 2 m/s.

400 N/m force constant; we must determine the distance.

The elastic potential energy of the spring is created from the kinetic energy of the block.

Kinetic energy and potential energy in relationship

1/2mv^2=1/2kx^2

x^2=mv^2/k

put the value into the formula

x^2= 4*2^2/400

x^2=.04

x= .2m

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Answer: m = 72 kg

Explanation:

The thickness of the oil is 0.327 m.

The bottom pressure of the tank is given by atmospheric pressure, pressure given by oil and pressure of water. It is mathematically given as,

P = Patm + ρoil g* t + ρwater g * h

Making 't' as subject, we have,

ρoil g* t = P - Patm - ρwater g * h

t = (P - Patm - ρwater g * h)/ρoil g -------(1)

Given that, Height of the tank h = 0.9 m

Pressure at the bottom of the tank P = 113 kPa

Patm = 1.013 * 10⁵ Pa

g = 9.8 m/s²

ρwater = 1000 kg/m³

ρoil = 900 kg/m³

Placing the values in the above equation,

t = (P - Patm - ρwater g * h)/ρoil g

t = (113* 10³ - 1.013 * 10⁵ - 10³* 9.8* 0.9 )/(900* 9.8)

⇒ (113* 10³ - 101.3* 10³ - 8.82* 10³)/(900* 9.8) = 2.88 * 10³/(900* 9.8)

⇒ 0.327 m

Thus, the thickness of the oil is found to be 0.327 m.

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Maximum torque developed is (BIL²/4[tex]\pi[/tex]n).

Torque is a measure of force that can cause an object to rotate about an axis.

For any structure such as a solenoid, toroid, and circular arc, the magnetic field at a certain point of the structure is always proportional to the number of turns of the coil.

As we know magnetic field is (BIL²/4[tex]\pi[/tex]n)

2[tex]\pi[/tex]rn = L

r = (L/2[tex]\pi[/tex]n)

A = [tex]\pi[/tex]r²

A = (L²/4[tex]\pi[/tex]n²)

M = niA

M = (iL²/4n[tex]\pi[/tex])

Then Torque is Z = MBSin90°

The question is incomplete, the complete question is "a wire of length l is wrapped into a coil with n turns this coil is then placed in a magnetic field of strength b,  the maximum possible torque developed is?"

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Answer:

C = 10000N

Explanation:

On a level surface, with no other force acting on the vehicle,

|Normal force| = |Weight|,

Weight = mass * acceleration due to gravity

= 1000 kg * 9.8 m/s^2 or N/kg

= 9800 N

--> 10000 N rounded to one significant digit

By simply creating more loops or pulleys, the pulley system's mechanical advantage can be accomplished.

Equation:

It is known that a pulley system can lift a crate with 90 newtons of force. Finding the pulley system's mechanical advantage is important if the input force is 15 newtons.

The force makes the distance longer as though it were working. Mechanical advantage is not greatly affected by the number of pulleys. This is only based on the amount of weight that needs to be lifted.

Therefore,

F1/F2 = 90/15

F1/F2 = 6

Given that the crate's weight is 90 N and the input force is 15 N, this makes sense.

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The magnitude of the resulting acceleration of the block is 5.60 m/s.

The product of the block's mass and acceleration is the net force acting on the block. Newton's second law of motion is what is known as this.

The following is the expression for Newton's second law:

F = ma

The net horizontal force acting on the block is as follows:

Fnet =F + FcosΘ

Here, F is the force acting on the block, and 8 is the angle at which the force is applied to the block.

Substitute 30Θ for 8 and 30 N for F.

Fnet =30 N + (30 N)cosΘ  = 55.98 N

From Newton's second law, the expression for the force is.

Fnet = ma

Substitute 10.0 kg for m and 55.98 N for Fnet

55.98 N  = (10 kg)a

a (55.98 N /10 kg)

a = 5.598 m/s2 a = 5.60 m/s

Therefore, the acceleration of the block is 15.60 m/s

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The question is incomplete. Your most probably complete question is given below: The figure is added.

Suppose you are in mission control on the moon, in charge of launching a moon-orbiting communications satellite.

a) 2430 N.

b) 1.84 x 10^6 m.

c) F = m * v^2 / r

d) 2157 m/s

e) 2.87 x 10^4 s

f)1.17 x 10^-3 m/s^2

a. The weight of the satellite near the surface of the moon would be the mass of the satellite multiplied by the acceleration due to gravity on the moon. The acceleration due to gravity on the moon is about 1.62 m/s^2, so the weight of the satellite would be

1500 kg * 1.62 m/s^2 = 2430 N.

b. The radius of the orbit of the satellite would be the distance from the center of the moon to the altitude of the satellite. The radius of the moon is 1.74 x 10^6 m, so the radius of the orbit of the satellite would be

1.74 x 10^6 m + 100 km = 1.84 x 10^6 m.

c. The centripetal force is the force that is required to keep an object in circular motion. It is equal to the mass of the object times its velocity squared, divided by the radius of its orbit. To find the centripetal force on the satellite, we need to know its velocity. We can find this using the equation for the centripetal force, which is:

F = m * v^2 / r

where F is the centripetal force, m is the mass of the object, v is the velocity of the object, and r is the radius of the orbit.

d. To find the required orbital velocity for the satellite, we can rearrange the equation for the centripetal force to solve for v:

v = sqrt(F * r / m)

Plugging in the values, we get:

v = sqrt(2430 N * 1.84 x 10^6 m / 1500 kg) = 2157 m/s

e. The orbital period is the time it takes for an object to complete one orbit. It is equal to the circumference of the orbit divided by the velocity of the object. The circumference of the orbit is 2 * pi * r, where r is the radius of the orbit. The velocity of the object is the orbital velocity we calculated above. Plugging these values into the equation, we get:

T = 2 * pi * r / v

Plugging in the values, we get:

T = 2 * pi * 1.84 x 10^6 m / 2157 m/s = 2.87 x 10^4 s

f. Yes, the satellite is accelerating while in orbit. The direction of the acceleration is towards the center of the orbit, and the magnitude of the acceleration is the centripetal acceleration, which can be calculated using the equation:

a = v^2 / r

Plugging in the values, we get:

a = 2157 m/s^2 / 1.84 x 10^6 m = 1.17 x 10^-3 m/s^2

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A cup anemometer, made up of three or four cups with a conical or hemispherical shape set symmetrically around a vertical spindle, is typically used to measure wind speed. The spindle turns because of the wind blowing into the cups.

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The smooth plastic jar has five pennies placed inside of it. The normal reactions of the bottom coin on the container at locations a and b will be 0.0705 lb and 0.1175 lb respectively if each coin weighs 0.0235 lb.

A contact force, the normal force is often referred to as the normal reaction force. On two surfaces that are not attached to one another, a normal force cannot be applied.

The body's weight determines the usual deceleration force. A body's position relative to the ground tells us when it is about to fall. The normal force is the portion of a force that is perpendicular to any contact surface.

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A 59-kg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 18 cm.  the maximum torque she exerts is 104.07Nm.

given that :

mass ,m = 59 kg

radius , r = 18 cm

The force , F = mg

F = 59 × 9.8

F = 578.2 N

The torque is expressed as:

torque = force × radius

torque = 578.2 N × 0.18 m

torque = 104.07 Nm

Thus, if the mass is 59 kg and the radius is 18 cm then  maximum torque she exerts is the 104.07 Nm.

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The minimum feeder ampacity of the given feeder with three motors with full load currents of 5A, 10A, and 15A is 18.75A.

Minimum Circuit Ampacity (MCA) is a value that specifies the minimum main power wire size. It is also used to decide the minimum wire size needed for a field-wired product.

This specification is needed to guarantee that the wiring will not overheat under the conditions that are operating. More accurately, we can say that the MCA is the highest steady-state electrical current that the unit can withstand when operating correctly.

MCA is found using the formula

MCA = 1.25 x Amperage value of feeder (here)

= 1.25× 15 A

= 18.75 A

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4th paths out of 1 - 5 would the bowling ball most closely follow as it falls to the ground

The bowling ball moves due to the resultant force of the vertical and horizontal direction.

The overall force operating on the item or body as well as the direction in which the body is moving are referred to as the resultant force. When the object is stationary or moving at the same speed as it, there is no consequent force.

The outcome is what is produced when vectors are added together. The biggest (maximum) consequent when adding two vectors is equal to their sum when forces are acting in the same direction.

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This statement is False because Solid-state sensors are used in place of a water - absorbing element in electronic humidistats. A damper in the bypassed duct is closed during the summer period to stop airflow.

Hygroscopy - A material is said to be hygroscopic if it has the capacity to adsorb and retain water or water from its immediate surroundings. Examples include ethanol, glycerin, concentrated sulfuric acid, honey, silica gel, and methanol.

Around the soil particles, some water in the soil creates an incredibly thin, firmly held layer. It's referred to as hydroscopic water. A little amount of water in the soil is chemically linked to soil components in the soil. We refer to it as mixed water.

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The induced current in the loop of the copper wire is found to be 7.85 mA.

The single loop of the copper wire is lying in flat plane and the magnetic field is pointing perpendicular to the plane of the loop. The area of the loop is given to be 7.8cm²

The magnetic field initially has a magnitude of 0.500 Tesla and it finally increases manner to grow to a magnitude of 3.50 Tesla in a time 1.10 seconds.

The induced EMF in the circuit will be given by the relation,

E = A∆B/∆T

Where,

B is magnetic field,

A is the area and T is the time taken.

Putting all the values,

E = 0.00078×(3.5-0.5)/1.1

E = 21.2mV.

The resistance in the copper loop is given to be 2.7 ohm.

Now, the induced current in the circuit will be given by the relation,

I = E/R

Putting all the values

I = 21.2/2.7

I = 7.85 mA.

So, the induced current in the wire is 7.85 milliamps.

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The value of 'x' such that the mass то exerts a force of mg on the inclined surface at P. (N=mg)​ is given by

x = N / (mg cos θ)

Generally, To determine the value of 'x', you need to know the angle of inclination of the surface and the mass of the object. The force of gravity (N) acting on the object is equal to the mass of the object (m) multiplied by the acceleration due to gravity (g). The force of gravity is also equal to the normal force (N) exerted by the surface on the object, which is perpendicular to the surface.

If the surface is inclined at an angle θ with respect to the horizontal, the normal force will be equal to the component of the force of gravity along the surface. This component can be calculated using the formula N = mg cos θ, where θ is the angle of inclination and m is the mass of the object.

Therefore, to determine the value of 'x', you need to solve the equation N = mg cos θ for 'x'. To do this, you can rearrange the equation to solve for x:

x = N / (mg cos θ)

Substituting the values of N, m, and θ into this equation will give you the value of 'x' that you are looking for.

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Radon is a radioactive gas which has no smell, colour or taste.

When you breathe in radon gas, it decomposes into solid radioactive particles that can become trapped in your lungs. These particles release small energy bursts as they degrade further. Over the course of ones lifetime, this can cause lung tissue to deteriorate and result in lung cancer.

Lung cancer has radon as one of its main causes. Depending on the average radon level across the nation and the prevalence of smoking, radon is thought to be responsible for anywhere from 3% to 14% of all lung cancers. Smokers are more likely to develop lung cancer due to the interaction between radon and smoking cigarettes.

There are tried-and-true, long-lasting, and reasonably priced ways to keep radon out of new construction and reduce it in existing structures.

With a small passive detector, it is simple to measure the amount of radon indoors.

The amount of radon in the air is measured in “picocuries per liter of air,” or “pCi/L

Note that your information is incomplete and a overview was given.

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The approximate distance that the smoke travels up from the furnace is 9metres.

Distance is described as a numerical or occasionally qualitative measurement of how far apart objects or points are. In the field of physics or everyday usage, distance is usually referred to a physical length or an estimation based on other criteria.

Parameters given:

Velocity = 1.5

time = 6 seconds

We know that distance = speed x time

Hence, distance = 1.5 x 6 seconds

distance = 9 meters.

Distance is a scalar quantity that refers to how much ground an object has covered in the course of its motion while we can describe displacement as a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

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(a) θ5 in the air is 56.9° and (b) θ4 in the bottom material 35.30°. Normally, a light beam that strikes an angle on a prism's refracting face emerges from the opposite face.

(a) Approximating n=1 for air, we have

n1. sinθ1 = (1)sinθ5 ⇒56.9°=θ5

​and with the more accurate value for n air in Table below, we obtain 56.80.(b) Equation n1 sinθ c =n2 sin 90° leads to,

n1 sinθ 1=n2 ​sinθ2​ =n3​ sinθ 3​ =n4 sinθ 4

​so that. θ4 =sin −1( n1/n4.sinθ 1 )=35.30° .

The angle of incidence is formed by a line drawn perpendicular to the reflecting barrier and the wave's direction of motion.

Refraction Depending on the Refractive Indices in the Two Media and the Angle of Incidence. Snell's law states that the angle of incidence, I and the proportion of the refractive indices of the two media that make up the interface determine the angle of refraction, r.

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