Circulatory System


1. What are the main organs and their functions of the circulatory system?


2. Explain how the circulatory system functions.


3. What does the circulatory system do for the organism?


4. What other body systems are necessary for the circulatory system to function properly?


5. How does the circulatory system affect the functioning of other body systems?

Locomotor skills are energy intensive and the pulse rate increases, shortness of breath ensues and pain increases in the muscle due to build up of lactic acid.

Skills are abilities that are acquire through training and practice such the athlete is able to execute them effectively and efficiently.

Some skills that can be acquired in sports include:

Learning a skill requires energy input.

Locomotor skills require the highest energy input.

During the learning of intensive skills such as locomotor skills, the pulse rate increases, shortness of breath ensues and pain increases in the muscle due to build up of lactic acid.

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A combining form for lungs is  "pneum/o".

In medical terminology, a combining form is a word part that is added to the beginning or end of a root word to modify its meaning. The combining form "pneum/o" is used to refer to the lungs, air, or respiration.

Some common medical terms that use the combining form "pneum/o" include:

Pneumonia: An infection of the lungs that can cause inflammation, coughing, and difficulty breathing.

Pneumothorax: A condition in which air leaks into the space between the lung and chest wall, causing the lung to collapse.

Pneumonectomy: A surgical procedure in which one or more lobes of the lung are removed.

Pneumology: The study of the lungs and respiratory system.

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Minimum diameter is required for the wire is 1.2X10⁻³m.

Tensile force, which consists of tensile stress and tensile strain, is the stretching force exerted on the material. This indicates that the forces are attempting to stretch the material that is subject to the force since it is under tension.

Given;

Tensile force (ft) = 780 N

length (l) = 3.00 mm

change in length (Δl) = 0.25 cm

determine the strain ε = Δl/l

determine the stress σ = Eε = E(Δl/l)

determine the cross-sectional area A = f/σ = ft/EΔl

determine the diameter d = 2\(\sqrt{} \frac{A}{\pi }\) = \(2\sqrt{} \frac{ft}{EXΔlX\pi }\)

take Young's modulus for steel E=200 GPa, Substitute the values,

d = \(\sqrt[2]{\frac{x780X2}{y200X10^{9} X 0.0025\pi } }\) = 1.2X10⁻³

minimum diameter is required for the wire is 1.2X10⁻³m.

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I understand that the question you are looking for is "A circular steel wire 3.00 cm long must stretch no more than 0.25 cm when a tensile force of 780 N is applied to each end of the wire. What minimum diameter is required for the wire?"

The cooling rate of the object is 0.054.

Let's find the cooling rate (k) of an object using the given information. Ts = 10 °CTo = 110 °CT1 = 35 °Ct2 = 25 minutes. Now, the given formula is T = Ts + (To - Ts) e ^ -kt. Here, we know that the temperature drops from 110°C to 35°C, which is 75°C in 25 minutes. Now, we will substitute the values in the formula as follows:35 = 10 + (110 - 10) e ^ (-k × 25) => (35 - 10) / 100 = e ^ (-k × 25) => 25 / 100 = k × 25 => k = 0.054. Therefore, the cooling rate of the object is 0.054. Hence, option A is correct.

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Answer:

OPEN

Explanation:

Answer:

a computer is a open system

Answer:

231 C final temperature, 211 C change in temperature

Explanation:

To solve this problem you you use the q=MCΔT equation, where q is heat, m is mass, c is specific heat, and ΔT is change in temperature. Since we're given heat and solving for temperature we rearrange the equation to q/(M*C)=ΔT. At this point we simply plug in the given values to get a ΔT of 211, but this is simply the change in temperature so you add the initial to this to get the final temp.

The correct answer is A. When a girl stands on a weighing scale, she exerts a downward force on the scale due to her weight. the support force acting on the girl is 200 N, which matches her weight.

According to Newton's third law, the scale exerts an equal and opposite upward force on the girl, known as the support force. This support force counterbalances the weight of the girl and prevents her from falling through the scale. Therefore, the support force acting on the girl is equal to her weight, which is 200 N. It's important to note that the support force is not the same as the girl's weight. Weight is the force with which an object is attracted towards the center of the earth, whereas the support force is the force exerted by the scale to counterbalance the weight. This distinction is important to understand in physics problems involving forces and motion.

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complete question:

How much support force acts on a 200-N girl standing on a weighing scale?

A. 200 N

B. No support force unless she stands on the floor

C. More than 200 N

D. Less than 200 N

The point between the two charges where the electric field equal to zero is calculated to be 1.55 m.

The charge q₁ is given as 3 nc = 3 × 10⁻⁹ c

It is located at x₁ = 0.

The charge q₂ is given as 7.5 nc = 7.5 × 10⁻⁹ c

It is located at x₂ = 4 m.

Let us suppose that, electric field is zero at the point x, it is in between 0 and 4 m.

We know the formula for electric field as,

E = k q /r²

Let us equate the electric field at both the charges.

k q₁/x² = k q₂/(x₂ - x)²

q₁ (x₂ - x)² = q₂ x²

3 × 10⁻⁹× (4 - x)² = 7.5 × 10⁻⁹ × x²

3 × ( 16 + x² - 8x) = 7.5 ×x²

48 + 3x² - 24x = 7.5x²

4.5 x² + 24x - 48 = 0

The two values of x are,

x = 1.55, -6.883

The distance cannot be negative. So, the electric field at x = 1.55 m is said to be zero.

Thus, the required value of x is 1.55 m.

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Answer:

Rechargeable batteries can still go flat after repeated use because the materials involved in the reaction lose their ability to charge and regenerate

Explanation:

they go flat because they a rechargeable and sometimes don't always work

thank you hope u have a good day

We can use the formula:

P = VI

where P is the power in watts, V is the voltage in volts, and I is the current in amperes.

For a 75-watt lightbulb,

75 = 120 × I

I = 0.625 A

To find out how many bulbs can be used without blowing a 17 A fuse, we divide the maximum current by the current for one bulb:

17 A / 0.625 A = 27.2

Therefore, we can use 27 75-watt lightbulbs without blowing a 17 A fuse.

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The resulting equation of motion for the system is given by m × x''(t) + k × x(t) = f(t), which is 2 × x''(t) + 18 * x(t) = 2 * sin(2t).

What is  equation of motion?

The equations of motion are a set of mathematical relationships that describe the motion of objects under the influence of forces. There are different sets of equations of motion, depending on the specific scenario and the type of motion being considered (linear motion, projectile motion, circular motion, etc.). The equations of motion for linear motion, also known as the equations of uniformly accelerated motion.

To find the equation of motion for the system, we start with Newton's second law of motion, which states that the sum of forces acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the object is the 2-kg mass attached to the spring.

The force exerted by the spring is proportional to the displacement of the mass from its equilibrium position, and it can be expressed as F_spring = -k× x(t), where k is the spring constant and x(t) is the displacement of the mass at time t.

In addition to the force exerted by the spring, there is an external force f(t) = 2 ×sin(2t) acting on the mass.

Applying Newton's second law, we have the equation of motion: m ×x''(t) + k ×x(t) = f(t).

Substituting the given values, m = 2 kg and k = 18 N/m, we obtain 2 ×x''(t) + 18 × x(t) = 2 ×sin(2t).

Therefore, the resulting equation of motion for the system is 2 × x''(t) + 18 × x(t) = 2 × sin(2t).

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Answer: they vibrate faster and becomes hotter

Explanation:

.

Answer:

The function that describes the acceleration of the particle at time t is:

a(t) = -6 m/s^2.

Explanation:

To find the function that describes the acceleration of the particle at time t, we need to take the second derivative of the position function s(t).

Given:

s(t) = -3t^2 - 4t + 1

Taking the derivative of s(t) with respect to t will give us the velocity function v(t):

v(t) = d/dt [-3t^2 - 4t + 1]

= -6t - 4

Now, we can take the derivative of v(t) with respect to t to find the acceleration function a(t):

a(t) = d/dt [-6t - 4]

= -6

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Answer:

The volume of water displaced by the raft is 0.233 m³

Explanation:

The question relates to Archimedes' principle which states that the buoyant force experienced by an object immersed in a fluid is equal to the weight of (the force of gravity on) the displaced fluid

The given parameters are;

The combined mass of the person and the raft, m = 233 kg

The liquid on which the raft is located = Water

The density of water, \(\rho _{water}\) = 1000 kg/m³

Weight = Mass, m × g

Where;

m = The mass of the object

g = The acceleration due to gravity = 9.8 m/s²

Given that the raft is on the surface of the water (floating), the buoyant force is equal to the combined weight of the person and the raft = 233 kg

The combined weight of the person and the raft, \(W_{combined}\) = 233 kg × 9.8 m/s² = 2,283.4 N

Therefore;

The buoyant force = 2,283.4 N = The weight of the water displaced

The mass of the water displaced, \(m_{water}\), = 2,283.4 N/(9.8 m/s²) = 233 kg

Density = Mass/Volume

The volume of water displaced by the raft = The mass of the water displaced/(The density of the water) = 233 kg/(1,000 kg/m³) = 0.233 m³.

Answer:

the volume displaced by the raft = 0.233 m3

Explanation:

correct for Acellus

The ratio of turns in the primary and secondary coils of her transformer is 1.916

Primary voltage = 230v

secondary voltage = 120v

The ratio of turns in primary and secondary coils of transformer is given by,

Np/Ns = 230/120

           = 1.916

Transformer: a piece of equipment used to increase or decrease voltage while transferring electrical energy from one alternating-current circuit to another or several circuits. Transformers are used for a wide range of tasks, including lowering the voltage of traditional power circuits to operate low-voltage appliances like doorbells and toy electric trains and raising the voltage of electric generators to enable long-distance transmission of electrical power.

Transformers alter voltage using electromagnetic induction, which means that current is induced in a second coil known as the secondary as the magnetic lines of force (flux lines) build up and collapse with changes in current travelling through the primary coil. To determine the secondary voltage, multiply the primary voltage by the number-to-number ratio. Transformers are devices that convert electrical energy from a single alternating-current turn in the secondary coil to the number of turns in the main coil, a measurement known as the turns ratio.

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Answer:

8 N

Explanation:

work=force*distance

force=work/distance

=56/7

=8

Electrons are the particle will be deflected toward the positive plate as it enters the electric field.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

The field's direction is determined by the direction of the force acting on the positive charge. A positive charge produces a radially outward electric field, whereas a negative charge produces a radially inward electric field.

A physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is referred to as an electric field.

Hence,electrons are the particle will be deflected toward the positive plate as it enters the electric field.

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Yes it is true  ,A broad group of actions with the intention of assisting others includes helping, sharing, providing comfort, contributing or volunteering, and cooperating.

Research on prosocial conduct has looked at the potential causes and effects of these behaviors as well as the various reasons that might be at play. Prosocial Behavior's Type 3. The factors. Actions that "benefit other people or society as a whole," such as assisting, sharing, contributing, cooperating, and volunteering, are considered prosocial conduct, also known as "voluntary behavior intended to benefit another." Evidence demonstrates that prosociality is essential to social groupings' wellbeing on a variety of measures. Empathy has significant evolutionary roots and is a powerful motivator of prosocial action. Children benefit from the development of desirable qualities fostered by prosocial activity.

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Answer:

15    and  11 ohms

Explanation:

First one =   For the parallel resistors 1 / (1/6 + 1/6 + 1/6) =   1/ (3/6 ) = 6/3 = 2 ohms   then add the 3 and the 10  = 15 ohms

second one    for the parallel portion   equiv =    (10+2)*24 / ( (10+2 + 24) = 8

  then add the  3 in series = 11 ohms

The minimum thickness of the antireflective coating would need to be approximately 687.5 nm to minimize reflection of 550-nm light.

The minimum thickness of the antireflective film can be determined using the concept of optical interference. When light passes from one medium to another with different refractive indices, some of the light is reflected at the interface. To minimize this reflection, the thickness of the film can be adjusted to create destructive interference between the reflected waves.

For the antireflective coating on the glass, we need to consider that the film should be λ/4 thick, where λ is the wavelength of the light in the material. The given wavelength of 550 nm corresponds to 550 × 10^-9 m.

To calculate the minimum thickness, we can use the formula:

t = (λ / 4) / (n - 1)

where t is the thickness of the film and n is the refractive index of the material. Substituting the given values, we have:

\(t = (550 * 10^{-9}m / 4) / (1.50 - 1)\)

≈ 687.5 nm

Therefore, the minimum thickness of the film would need to be approximately 687.5  nm to minimize the reflection of 550-nm light.

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The amount of work done by the car engine if it is 100% efficient is 366.67 Joules.

Given the following data:

To determine the amount of work done by the car engine if it is 100% efficient:

Mathematically, the work done by an object with respect to power and time is given by the formula:

\(Work\;done = \frac{Power}{time}\)

Substituting the given parameters into the formula, we have;

\(Work\;done = \frac{22000}{60}\)

Work done = 366.67 Joules.

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The rate of heat transfer from the entire plate is 710.8 kW

The properties of mercury at the film temperature of (75+25)/2= 50°C

k = 8.83632 W/m °C

v = 1.056 × \(10^-^7\) m²/s

Pr = 0.0223

The local Nusselt number relation for liquid metals is given by

 \(N_u =\frac{h_sx}{k} = 0.565 9Re_x Pr)^\frac{1}{2}\)

The average heat transfer coefficient for the entire surface can be determined from

\(h = \frac{1}{L} \int\limits^1_0 {h_x} \, dx\)

Substituting the local Nusselt number relation into the above equation and performing the integration we obtain

\(N_u = 1.13 (Re_s Pr)^\frac{1}{2}\)

The Reynolds number is

\(Re_L = \frac{VL}{v} = \frac{(0.01)(3m)}{1.056 * 10^-^7 m^2/s} = 0.028 * 10^7\)

Using the relation for the Nusselt number, the average heat transfer coefficient and the heat transfer rate are determined to be

                       Q = 710.8 kW

Therefore, the rate of heat transfer from the entire plate is 710.8 kW

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27.44 J of the potential energy of the book relative to the ground, when a 1.60 m tall person lifts 1.40 kg of the book off the ground.

A 1.60 m m tall person lifts a 1.40 kg book off the ground so it is 2.00 m m above the ground.

The potential energy of the book relative to the ground would be:

PE = mgh

Where PE is the potential energy,

m is the mass,

g is the acceleration due to gravity, and

h is the height

The acceleration due to gravity is constant and is 9.8 m/s²

mass m = 1.40 kg

Height h = 2.00 m

mgh = 1.40 × 9.8 × 2.00 = 27.44 J

Ans: The potential energy of the book relative to the ground is 27.44 J.

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Answer:

To holds the legs apart without rupturing any vein

Explanation:

The purpose of using string to tie the forelegs and hind legs during dissection is to hold the legs apart without rupturing ant vein or artillery for easy dissection procedure( the dismembering of the body of a deceased animal or plant to study its anatomical structure)

when tieing the forelegs and the hind legs the same string is used to tie them and the string is then passed/looped under the dissecting table/tray this way the legs will be held apart and the dissection can commence.

Answer:its D

Explanation:

i did the test and got it right

The transformation function of the given exponential function is -1/4, -1, -4, -16, -64. Hence option D is correct.

An exponential function is a mathematical relation to find exponential growth or decay for the given data. It represents the constant change in independent variables and gives the same proportional change.

The exponential function is expressed as f(x) = exp (x) or eˣ where x is variable and e is constant which is called the base of the equation.  

From the given,

the exponential function f(x) = 1/4, 1,4,16,64

The transformation function G(x) is the inverse of the exponential function and is equal to -1/4,-1, -4,-16,-64.

Hence, the ideal solution is option D.

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A 100kg crate slides along a floor with a starting velocity of 21 m/s. If the force due to friction is 8N, then, it will take 262.5 s for the box to come to rest.

We'll begin by calculating the declaration of the box. This can be obtained as follow:

Force (F) = –8 N (opposition)

Mass (m) = 100 Kg

–8 = 100 × a

Divide both side by 1000

\(a = \frac{-8}{100}\)

Therefore, the deceleration of the box is –0.08 ms¯²

Finally, we shall determine the time taken for the box to come to rest. This can be obtained as follow:

Deceleration (a) = –0.08 ms¯²

Initial velocity (u) = 21 ms¯¹

Final velocity (v) = 0 ms¯¹

0 = 21 + (–0.08×t)

0 = 21 – 0.08t

Collect like terms

0 – 21 = –0.08t

–21 = –0.08t

Divide both side by –0.08

\(t = \frac{-21}{-0.08}\\\\\)

Therefore, it will take 262.5 s for the box to come to rest.

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Women:

They were excluded due to social expectations, they were expected to take a female role that entailed learning domestic skills, getting married, having children.

Minorities:

They were excluded because of limited academic opportunities.

Women were excluded from psychology due to social expectations.

Minorities were excluded from psychology because of limited academic opportunities.

Psychology is the scientific study related to mind and behavior. Psychology involves the study of conscious and unconscious mind, including feelings and emotions.

Women were not allowed or accepted to refer to the Psychologist because they were considered to be always happy with the family and being busy with the house chores and take responsibility of all the family members.

Women were expected to take a female role that include learning domestic skills, getting married and having children.

For minority, they are not allowed to take hold of post or admission in academic institutions. They have very limited amount of opportunities in educational background.

Thus, the reasons are explained for the exemption of women and minority from psychology.

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