if a boiler has a stack temperature of 475 degrees f and the temperature of the air entering the furnace is 84 degrees f, how much heat is being lost to the atmosphere per pound of fuel burned? (note: the specific heat of the gases of combustion is .24 btu/lb.)

Velocity is a vector quantity that describes an object's change in position over time. The general definition of velocity is the derivative of the position vector ~r with respect to time, denoted as v = dr/dt. This means that velocity is the rate of change of position with respect to time. It is also a measure of how fast an object is moving in a particular direction.

Acceleration is another vector quantity that describes an object's change in velocity over time. The general definition of acceleration is the derivative of the velocity vector ~v with respect to time,

denoted as a = dv/dt. This means that acceleration is the rate of change of velocity with respect to time. It is also a measure of how quickly an object's velocity is changing.

In summary, velocity is a measure of how fast an object is moving in a particular direction, while the acceleration is a measure of how quickly an object's velocity is changing. Both are vector quantities and can be described in terms of position vector ~r.

Read more about Kinematics:

https://brainly.com/question/26407594

#SPJ4

620V current I3, Electric circuits can be simple or sophisticated, but they all consist of the same three fundamental parts:

V = I * R = 31.00 * 20.00 = 620V.

To learn more about Ohm's Law refer to:

https://brainly.com/question/14296509

#SPJ1

(a) Impulse delivered to the ball by the floor is 3.8 kg.m/s, and direction is upward. (b) average force exerted on the ball by the floor is 95 N, and the direction is upward.

Amount of force applied for a certain amount of time to cause the change in momentum is called impulse.

(a) impulse delivered to ball by the floor is;

As, impulse = change in momentum = m(vf - vi)

where m is  mass of the ball, vf is  final velocity of the ball after the collision and vi is  initial velocity of the ball before collision.

Since the ball falls from a height of 18.5 m and rebounds to a height of 15.0 m, we know that the final velocity of the ball is upward, and the initial velocity of the ball is downward.

final velocity ; vf = sqrt(2gh)

where g is acceleration due to gravity and h is height of the rebound.

initial velocity; vi = sqrt(2gh)

where g is acceleration due to gravity and h is height of the fall.

vf = sqrt(29.815) = 7.68 m/s

vi = sqrt(29.818.5) = -10.26 m/s (upwards)

So, impulse = m(vf - vi) = 0.360 kg * (7.68 m/s - (-10.26 m/s)) = 3.8 kg.m/s

The impulse delivered to the ball by the floor is 3.8 kg.m/s, and direction is upward.

(b) The average force exerted on the ball by the floor;

average force = impulse / time of contact = 3.8 kg.m/s / 0.0400 s = 95 N

direction of force is upward.

The average force exerted on the ball by the floor is 95 N, and the direction is upward.

To know more about impulse, refer

https://brainly.com/question/229647

#SPJ4

The following are correct statements about the diagram that shows the electric field due to point charge Q:

The attraction and repulsion of electrical charges, which is what causes electric flow, create an electric field, which is an invisible force field and is measured in Volts per metre (V/m).

This question requires us to discuss what the electric field due to point charge Q is.

As a result, we can see that the electric field, which serves as the physical field that surrounds electrically-charged particles, has a nonuniform electric field and a positive charge Q.

As a result, in terms of the electric field caused by point charge Q;

Learn more about electric field

brainly.com/question/14529872

#SPJ4

Complete question:

The diagram shows the electric field due to point charge Q. Which statements are correct? Check all that apply.

A person exerts a horizontal force on a banana at rest on a counter top. The banana remains at rest is zero.

When two surfaces come into contact with one another, frictional force acts to move them either in the same direction or in the opposite way. Since friction is a force that opposes or resists an object's ability to glide against another when they come into contact. As a result, the force of friction is a contact force. A force called friction always works against motion. The texture of the surfaces of the items that made contact with each other and the amount of force applied to them both have a significant impact on the frictional forces. Rolling, sliding, static, and kinetic friction are the four main categories under which frictional forces are categorised. Fluid friction is yet another significant type of friction.

Frictional forces exist between the banana and the countertop. These forces resist the motion of the banana, and it remains at rest because the force applied to it is not enough to overcome the force of friction. In this scenario, the frictional force does zero work on the banana because the banana does not move, and work is defined as force applied over a distance.

The force exerted by the person is equal and opposite to the force of friction, so the net force on the banana is zero, and no work is done on the banana.

To know more about force visit:

https://brainly.com/question/28875770

#SPJ4

The circle's center is where the acceleration is pointed radially.

To learn more about acceleration refer to:

https://brainly.com/question/30257873

#SPJ4

The distance traveled by the sperm whale traveling at an initial speed of 1.10m/s to 2.44m/s is 23.7m.

The distance traveled by the sperm whale can be estimated using one of the equations of motion as follows:

v² = u² + 2as

Where;

According to this question, a sperm whale can accelerate at about 0.100 m/s² when swimming on the surface of the ocean. The distance traveled by the whale can be calculated as follows:

2.44² = 1.10² + 2(0.10)(s)

5.95 = 1.21 + 0.2s

4.74 = 0.2s

s = 23.7m

Therefore, 23.7m is the distance of the sperm whale.

Learn more about distance at: https://brainly.com/question/29055485

#SPJ1

This law can be expressed as follows: force (F) equals mass (m) times acceleration (a); F = m * a.

It is a frame of reference problem that requires us to exert a pseudo-force on the item.

If an object is accelerating, such as a car, the pendulum's motion must be measured in relation to the accelerating car.

On the pendulum, a pseudoforce equal to ma will be applied in the direction that the automobile is accelerating against.

Here, the pendulum's mass is m, and the car's acceleration is a.If T is the string's tension and it forms an angle of with the vertical,

T sin = mg

Ma = tsin

tanθ = a/g

θ = tan⁻¹ (a/g)

To learn more about acceleration refer

https://brainly.com/question/16269581

#SPJ4

A procedure the students could use to determine the charge-to-mass ratio of the particles includes the following steps:

1.Obtain a sample of the particles of interest.

2.Set up a parallel plate electrostatic apparatus with a known voltage difference across the plates.

3.Measure the distance between the plates and the electric field strength between the plates.

4.Introduce the sample of particles between the plates, and use a detector to measure the current that flows between the plates.

5.Vary the voltage difference across the plates and record the corresponding current for each voltage.

6.Plot a graph of current versus voltage. The slope of this graph represents the charge-to-mass ratio of the particles.

7.To reduce experimental uncertainty, the students should use a high-precision voltmeter to measure the voltage and a high-precision ammeter to measure the current. They should also take multiple measurements at each voltage and take the average. They should also use a large number of particles to get a more accurate result.

8.Also, the students should ensure that the electrodes are clean, and the electric field is uniform across the gap, as any non-uniformity would affect the results.

9.They should also try to minimize the environmental effects such as temperature and humidity, which could affect the results.

10.Finally, repeat the experiment multiple times and take the average of the results to get the most accurate value of charge-to-mass ratio of the particles.

Learn more about charge-to-mass ratio at : https://brainly.com/question/11927241

#SPJ4

The physics professor should be 3.60m far from the physics building for the egg to successfully fall on professor's head, assuming freefall motion of the egg and acceleration to be 9.80 m/s^2.

The height of the building = 46 m

The height of the professor = 1.80 m

The effective height for freefall of the egg = 46.00 - 1.80 = 44.2 m

As S = ug + 1/2a[tex]t^{2}[/tex]

44.2 = 0 + 1/2 × [tex]t^{2}[/tex] × 9.8

[tex]t^{2}[/tex] = (2 × 44.2) / 9.8

[tex]t^{2}[/tex] = [tex]\sqrt{9.02}[/tex]

[tex]t[/tex] = 3.003 s

Let the distance travelled by the professor be x

The time taken by the egg to fall is equal to the time taken by the professor to reach the building through distance x

Speed with which the professor is walking = 1.20 m/s

Now as Distance = Speed × Time,

x = 1.20 × 3.003

x = 3.6036 meters.

Learn more about freefall here:

https://brainly.com/question/17067422

#SPJ4

The fox spends 0.91 seconds in the air after leaving the snow at a speed of 3.84 m/s.

h = 91 cm = 0.91 m is provided.

Locate: vi, t

We may apply the formulae v = vi - 9.81 t and y = vi t - 4.905 t2.

There is a further fact that we are aware of. The fox has zero velocity at height h, the highest point of the jump:

0.91 = vi tp - 4.905 tp2 where 0 = vi - 9.81 tp

There are now two equations and two unknowns remaining. The starting velocity, vi, may be solved for.

vi = 9.81 tp - 4.905 tp2 - 9.81 tp2 - 4.905 tp2 tp = 0.391 seconds

vi=9.81 tp=3.84 m/s.

That is one response. Applying the second equation once more:

t = 3.84 t - 4.905 t2 0 = t = y = vi t - 4.905 t2 0 (3.84 - 4.905 t)

t = 0, 0.91 s

The fox spends 0.91 seconds in the air after leaving the snow at a speed of 3.84 m/s.

To learn more about speed refer to:

https://brainly.com/question/5176575

#SPJ1

A car travels at constant speed up a hill from point A to point B. As the car travels from A to B, its gravitational potential energy (b) increases and its KE decreases.

Gravitational potential energy:

If a mass (m) moves from infinity to a point within the gravitational influence of the source mass (M) without acceleration, then in transferring it to the source field. The amount of work done is stored in the form of potential energy. This is known as gravitational potential energy. It is denoted by the symbol Ug.

We know that the potential energy of an object at a position is defined as the energy stored in the object at that position. When the position of the body changes due to the influence of an external force, the change in potential energy equals the work done by the force on the body.

Under the action of gravity, the force is conservative because the work done is independent of the path of position change. Also, all these forces have potential. Since the effect of gravity on an object at infinity is zero, it has zero potential energy, which we call the reference point.

The equation for gravitational potential energy is:

                 GPE = m × g× h

where, m is the mass in kilograms

g is the acceleration due to gravity.

h is the height above the ground in meters.

Learn more about Gravitational Potential Energy:

https://brainly.com/question/19768887

#SPJ4

Total stopping distance is more complicated than how quickly your car stops after you press the brakes.You have a minimum 268 foot total stopping distance at 50 mph.

To learn more about stopping distance refer

https://brainly.com/question/24020960

#SPJ4

Kinetic energy reaches its peak at the track's lowest point as the skater goes back and forth.

In physics, an object's kinetic energy is the energy it has as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a given velocity. The body retains its kinetic energy after gaining it during acceleration unless its speed changes. Kinetic energy is the energy of motion, which can be seen as an object or subatomic particle moving. Kinetic energy exists in every moving object and particle. Kinetic energy is demonstrated by a person walking, a soaring baseball, a crumb falling from a table, and a charged particle in an electric field.

Here,

Kinetic energy peaks at the lowest point of the track as the skater goes back and forth.

To know more about kinetic energy,

https://brainly.com/question/26472013

#SPJ4

The viscosity of the solution i.e. the value of D in the equation is 0.045 [tex]kgm^{-1} s^{-1}[/tex] or 0.045 newton-second per square meter.

At time t = 0,

y(t) = A + Bt + C[tex]e^{-Dt}[/tex]

0.07 = A + C    (as t = 0 and power of zero gives unity)  

y component of v at t = 0 => [tex]\frac{dy}{dt}[/tex] = 0

=> 0 + B + (-D) C[tex]e^{-Dt}[/tex] = 0

=> B - CD = 0  

=> B = CD         (as t = 0 and power of zero gives unity)  

y component of acceleration a at t = 0 => [tex]\frac{dv}{dt}[/tex] = 0.025

=> 0 - (-D)CD[tex]e^{-Dt}[/tex] = 0.025

=> C[tex]D^{2}[/tex] = 0.025 (as t = 0 and power of zero gives unity)  

At time = ∞

y component of velocity v => 0 + B + (-D) C[tex]e^{-Dt}[/tex] = 0.55

=> B = 0.55       (as t = ∞ and power of  ∞ gives 0)

Now, using B = 0.55, CD = 0.55

As C[tex]D^{2}[/tex] = 0.025 => 0.55 × [tex]D[/tex] = 0.025

=> [tex]D[/tex] = 25 / 550 = 0.045

Hence, the viscosity of the solution is  0.045 [tex]kgm^{-1} s^{-1}[/tex] or 0.045 newton-second per square meter.

Learn more about viscosity here:

https://brainly.com/question/2193315

#SPJ4

The NEE directional component is quite consistent throughout the year, with the exception of the summer months.

The wind direction from NEE is more frequent in the winter and spring, when cold air masses dominate the region.

The other predominant direction from which the wind blows is the Southwest (SW). The percentage of time that the wind blows from the SW is approximately 31%. The SW directional component is quite consistent throughout the year, and tends to be more frequent in the summer and fall months. This direction of wind is usually associated with warm air masses, which can bring rainfall and storms.

The remaining wind directions, from the North (N), South (S), East (E), and West (W), make up the remaining 32-33% of the time. These directions are usually associated with different weather patterns and are more variable throughout the year. For example, during the summer months, the N and S directional components will be higher than the E and W directional components.

The variability in wind direction throughout the year is caused by a combination of large-scale weather patterns and local terrain. The large-scale weather patterns that affect wind direction are the prevailing winds and global circulation patterns. Local terrain also plays a role, as some areas may have more of a particular direction of wind due to their location.

Overall, the NEE and SW directions are the most predominant wind directions in the region. Although the other four directions make up the remaining portion of the wind patterns, they are usually associated with different weather patterns and are more variable throughout the year.

To know more about weather patterns click-

https://brainly.com/question/28789144

#SPJ4

The population in this particular problem is the pork roast. The parameter on which the population is being evaluated is 142 degrees Fahrenheit. The sample is the three random places in the pork roast where the temperature was checked. The statistic is 152 degrees Fahrenheit, which was the minimum temperature recorded during sampling.

1. The population is the object or group on which the evaluation is being done. In this scenario, the population is the pork roast.

2. Parameter is a bar which is set for measuring a feature in the population. In this problem, Micah wants the pork roast, i.e., the population, to have a minimum temperature of 142 degrees Fahrenheit.

3. A sample is chosen at random from a given population to check if the parameter matches. In this problem, Micah checked the temperature of the pork roast at three random places to deduce the average temperature of the population.

4. The statistic is the actual measurement of the sample which is compared to the parameter. In this case, the statistic would be the average minimum temperature of 152 degrees Fahrenheit.

Learn more about random sampling here brainly.com/question/13219833

#SPJ4

The best design for testing whether memory is accurate would be option C: Experimental design.

An experimental design allows the researcher to manipulate one or more independent variables and observe the effect on a dependent variable, in this case, memory accuracy.

This type of design allows for a cause-and-effect relationship to be established, as the manipulation of the independent variable is the only reason for the change in the dependent variable. This design also allows the researcher to control for extraneous variables that could affect the results.

In conclusion, an experimental design is the best option for testing whether memory is accurate as it allows for a cause-and-effect relationship to be established, allows the researcher to control for extraneous variables and allows for generalizing the findings to a larger population.

Learn more about Experimental design from

https://brainly.com/question/1418338

#SPJ1

a)The gravitational potential energy has changed by 1536.92 joules.

b) The skateboarder's vertical height fluctuated by 2.919 meters.

Energy to a skateboarder (a) - 1620.8J

The skateboarder's initial kinetic energy is given by K i = 1/2 * mu 2 = 1/2 * (56.5kg) * (2.44m/s) 2 = 165.5J, whereas his final kinetic energy is given by K f = 1/2 * m * v 2 = 1/2 * (56.5kg) * (7.24m/s) 2 = 1457.2J, where v is his final speed.

The kinetic energy shift is therefore Delta*K = K f - K i = 1457.2J - 166.5.J = 1290.6J.

The change in the skateboarder's mechanical energy (kinetic plus potential) is equal to the work done on

it: W = 80.0J is the effort the skateboarder did on himself, therefore Delta*K + Delta*E p = W + W f

The amount of work done by friction is W f = 265J.

The shift in gravitational potential energy is represented by the formula Delta*E p =E pf -E pi.

Delta*K = 80.0J - 265J - 1457.2J = - 1620.8J, where Delta*E p = W + W f - Delta*K.

(b) 2.97 m

The skateboarder's shift in potential energy may be expressed mathematically as Delta*E p = mg*Delta*h.

where g = 9.8m / (s 2) is the acceleration of gravity and m = 56.5 kg is the mass.

The skateboarder's change in vertical height is measured by delta*h.

Delta*h is calculated as (Delta*E p)/(mg) = (- 1620.8J)/((56.5kg)(9.8m / (s 2))) = - 2.99m.

Where the skateboarder has descended as indicated by the negative symbol. Because we are only concerned with the absolute value, the solution is h = 2.99m.

To learn more about gravitational potential energy refer to:

https://brainly.com/question/12902132

#SPJ4

An exercise that makes your body use a large amount of oxygen over a long period of time is an aerobic exercise.

The word "aerobic" literally means "with oxygen," meaning that the amount of oxygen that can reach the muscles to support their ability to burn fuel and move depends on how much air is breathed in. The cardiovascular system is strengthened by aerobic exercise.  A great way to lose weight is through aerobic activity. Along with helping you lose weight, these exercises also improve your muscles' stamina.

Furthermore, aerobic exercise is the most effective strategy to shed extra fat since it increases the amount of oxygen that your body receives. A warm-up and cool-down should be done before and after every aerobic activity session. Individual exercise tolerance should be the foundation for advancing to higher intensities of exercise. The intensity should also be increased very gradually.

To learn more about aerobic exercise, visit:

https://brainly.com/question/28513883

#SPJ1

The principle of conservation of momentum states that if two objects collide, then the total momentum before and after the collision will be the same if there is no external force acting on the colliding objects.

The conservation of linear momentum is a general law of physics which states that the overall momentum of a system is constant and that the quantity called momentum which characterises motion never changes in an isolated collection of objects.

For a system to have its momentum conserved, it must satisfy two conditions: During the interaction, the system's mass must not change. The objects may transmit mass to one another as they interact (apply forces to one another), but any mass one object gets is offset by the loss of that mass from another.

On the reasonable assumption that space is uniform—that is, that there is nothing in the rules of physics that prevents the conservation of linear momentum—the law of conservation of linear momentum is amply supported by experiment and can even be analytically inferred.

To learn more about  linear momentum refer to  :

https://brainly.com/question/24424291

#SPJ1

Transducer element converts a sensor's minute actions into a usable indication or signal.

A transducer which is known as thermocouple, is able to sense changes in temperature and it produce the output voltages representative of those changes. A lot of the sensors which is used in HVACR are also transducers since they generate the electrical signal while monitoring another signal as input.

The circuit which is to be measured and the ammeters must be linked in series and it measures the current. The entire circuit where current can pass through an ammeter at relatively low currents (up to a few amperes).

Power readings are taken with a power meter. The potential difference between two locations in a circuit is measured using a voltmeter.

Learn more about transducers:

brainly.com/question/13103015

#SPJ4

The magnitude of the force is directly related to the amount of work done; the greater the force, the greater the amount of work done on the particle.

To learn more about the scalar or dot product refer to:

https://brainly.com/question/26550859

#SPJ4

The answers include the following:

A. This method observes subjects with little interference in their "natural habitat" - Naturalistic observation.

B. This method is an intensive study of a person or a group - Case study.

C.  This method uses questionnaires and interviews to collect information about people's attitudes, beliefs, feelings, behaviors, and lifestyles - Survey.

Thus us referred to as the active acquisition of information from a primary source and involves the use of our senses.

Naturalistic observation is a type which involves observing subjects with little or no interference in their "natural habitat" which was why it was chosen as the correct choice,

Read more about Observation here https://brainly.com/question/13303856

#SPJ1

The direction of the electric force on the charge at the bottom left-hand vertex of the triangle due to the other two charges (k * q 2)/(a 2)

The amount of the charge at the triangle's top vertex, which is responsible for the charge at the bottom left corner, will act along the +ve x-axis and the +ve y-axis.

According to Coulomb's law, the forces acting on the charge at the triangle's top vertex are cos 60 and the forces acting on the charge at the bottom-left corner are

Since they resist one another, the amount of the charge caused by the charge in the bottom-right corner will only affect the -ve x-axis (like charges repel). There is a magnitude.

The top charge makes a 60° angle with the charge that we're thinking about.

F x = (k * q 2)/(a 2) * cos 60 represents the overall force acting on the charge along the x-axis.

The two x-axis forces and the y-axis force share some elements in common.

To learn more about electric force refer to:

https://brainly.com/question/17330790

#SPJ4

Answer:

A Salt deposits that were formed thousands of years ago by the evaporation of ocean water have the same composition as salt deposits formed today would provide the most support for the proposition that the composition of ocean water has remained constant for thousands of years. This statement directly supports the idea that the composition of ocean water has not changed over time, as the salt deposits that were formed in the past have the same composition as those formed today. The other statements provide supporting evidence but not as strong as statement A.

G = -9.81 m/s2 is the gravitational acceleration close to the earth. Simply multiply the acceleration of gravity by the length of time since anything was released to determine its speed (or velocity) after that period of time. Velocity is calculated as follows: V = gt = -9.81 m/s2 * time.

To Learn more About gravitational acceleration refer to:

https://brainly.com/question/14374981

#SPJ4

The resultant internal loadings acting on the cross section of the boom at point E is -2.54kN·m, force equilibrium equations.

The notion of equilibrium or balance is a very fundamental concept when dealing with forces. An object can typically be affected by multiple forces at once. A force is a vector quantity, meaning it has both a magnitude (size) and a direction.

There is no net force acting on an object and it is said to be in equilibrium if the size and direction of the forces acting on it are exactly balanced. The first law of motion states that an object at rest will remain at rest and an object in motion will remain in motion because there is no net force acting on an object in equilibrium.

We will consider segment AE of the boom, so we must first determine the pin reactions at A. Notice that member CD is a two-force member. The free-body diagram of the boom is shown in Fig. 1–5 b . Applying the equations of equilibrium,

[tex]$$\begin{gathered}\circlearrowleft+\Sigma M_A=0 ; \quad F_{C D}\left(\frac{3}{5}\right)(2 \mathrm{~m})-[500(9.81) \mathrm{N}](3 \mathrm{~m})=0 \\F_{C D}=12262.5 \mathrm{~N} \\+\Sigma F_x=0 ; \quad A_x-(12262.5 \mathrm{~N})\left(\frac{4}{5}\right)=0 \\A_x=9810 \mathrm{~N} \\+\uparrow \Sigma F_y=0 ; \quad-A_y+(12262.5 \mathrm{~N})\left(\frac{3}{5}\right)-500(9.81) \mathrm{N}=0 \\A_y=2452.5 \mathrm{~N}\end{gathered}[/tex]

The free-body diagram of segment A E is shown in Fig. 1-5 c.

Equations of Equilibrium

[tex]$$\begin{array}{ll}\rightarrow \Sigma F_x=0 ; & N_E+9810 \mathrm{~N}=0 \\& N_E=-9810 \mathrm{~N}=-9.81 \mathrm{kN} \\+\uparrow \Sigma F_y=0 ; & -V_E-2452.5 \mathrm{~N}=0 \\& V_E=-2452.5 \mathrm{~N}=-2.45 \mathrm{kN}\end{array}$$$$\begin{aligned}\circlearrowleft+\Sigma M_E=0 ; & M_E+(2452.5 \mathrm{~N})(1 \mathrm{~m})=0 \\& M_E=-2452.5 \mathrm{~N} \cdot \mathrm{m}=-2.45 \mathrm{kN} \cdot \mathrm{m}\end{aligned}$$[/tex]

Thus, The resultant internal loadings acting on the cross section of the boom at point E is -2.54kN·m.

To know more about equilibrium click-

brainly.com/question/517289

#SPJ4

Full question:

The 500-kg engine is suspended from the crane boom in Fig. 1–5 a . Determine the resultant internal loadings acting on the cross section of the boom at point E .

3.8×1012kWh represents the total electricity production in the United States from all energy sources, in billions of kilowatt-hours, in 2017.

What is meant by electricity?

To learn more about electricity refer to

https://brainly.com/question/776932

#SPJ4