The aorta pumps blood away from the heart at about 40 cm/s and has a radius of about 1.0 cm. It then branches into many capillaries, each with a radius of about 5 x 10−4 cm carrying blood at a speed of 0.10 cm/s.
How many capillaries are there?

Answer: reference point

Explanation: A reference point could be a put or question utilized for comparison to decide in case something is in movement.

There will be exchange of heat in the system, the tub filled with ice will gain heat, while the bottle of liquid will lose heat.

The flow is made possible by means of convection which implies heat flow from region of higher concentration to region of low concentration

by actual movement of material particles

There are basically three modes of heat transfer

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Explanation:

if you go to connexus and are doing the science

Thermal Energy Unit Test 10 qestions 8th grd unit 5 test lesson 12 here are the correct answers

1. A. metal is heated from room temperature to 200'C.

2. B. The particles will have more space between them as steam, but they will be moving at the same speed in both states.

3. C. The potential energy decreases due to the tighter arrangement of the particles.

4. B. an increase in heat and an increase in kinetic energy until a phase change occurs.

5. C. thermometer

6. B. 4.

7. D. convection

8. C. Air moves from the areas of higher temperature to areas of lower temperature.

9. C. The temperature of the ice increases, while the temperature of the water decreases

10. A. heat transfer by radiation.

i hope this helps and please let me know if it does! = ) <3

Answer:

Explanation: A box that has a mass of 19.8kg is pushed across 16.4m on the floor with a force of 93.2N, the floor has 0.355 as the coefficient of kinetic friction:

Visual Illustration of the problem:

Net work done by roy:

Cooling coil is a part of air conditioner and  you are likely to find it located in the ductwork of a large apartment building. Hence, option (B) is correct.

The cooling coils are a part made up of tubes made of various materials that allow a fluid to move through them. These tubes also have an exterior contact with air or another gas, which enables a heat exchange.

In the fluid that flows through the cooling coils, either water or a refrigerant may be present.

The cooling coils are elements that cool or warm the air in a cooling system intended for comfort.

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While the Sun's corona is incredibly hot, the combined effects of distance, the vacuum of space, Earth's atmosphere, and the distribution of solar energy help protect us from being incinerated.

The Sun's corona indeed has an extremely high temperature, reaching up to millions of degrees Celsius. However, despite this intense heat, we are not incinerated due to a combination of factors.

Firstly, the corona's high temperature does not directly translate to an increase in heat transfer to objects at a distance from the Sun. Heat transfer occurs through conduction, convection, and radiation, but in the case of the Sun, the distance and vacuum of space act as insulating factors, significantly reducing the amount of heat reaching Earth.

Secondly, Earth's atmosphere plays a crucial role in protecting us from the Sun's extreme temperature. The atmosphere acts as a shield, absorbing and scattering a significant portion of the Sun's radiation. It filters out the most harmful ultraviolet and X-ray radiation, preventing it from reaching the surface.

Additionally, the Sun's energy is emitted in all directions, and only a small fraction reaches Earth. The vastness of space and the Sun's distribution of energy ensure that the Earth receives a manageable amount of solar radiation, which supports life rather than incinerating it.

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A social event must be painstakingly planned and the budget developed.

The steps that can be taken in planning a social event are;

Define the purpose and goals of the event: Determine what you want to achieve with the event, who the target audience is, and what kind of atmosphere you want to create.

Set a budget: Determine how much you can spend on the event and allocate funds for different expenses, such as venue rental, food and drinks, decorations, and entertainment.

Choose a date and location: Select a date that is convenient for your guests and a location that is suitable for the type of event you are planning.

Invite guests: Create a list of guests to invite and send out invitations, either by mail or email. Consider the size of the venue and the number of guests you would like to attend.

Plan the event details: Choose a theme or decor for the event, decide on the food and drink menu, and arrange for entertainment, such as music or games.

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Answer:

dolphin and wolf

Explanation:

the sharks jaw is way to small for it and is shaped differently

Answer:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.

Explanation:

Answer:

First scenario,

From 2nd Newton's law

F = ma

from the above eqn, it's evident

a = F/m

that is to say, acceleration is inversely proportional to mass

The greater the mass, the smaller the acceleration and the higher the acceleration, the smaller the mass.

Thus, You was in the wagon when it had the greatest acceleration because You has the smaller mass and thus the acceleration will be greater.

Second scenario,

Since Sara pulls with greater force and Force is directly proportional to acceleration according to the second Newton's law,

F = ma

then, when You is in the wagon it had greater acceleration since they have the same mass.

All the best!

Answer:

The study of charges in motion and their  interaction with magnetic fields is known as electromagnetism.

Any material with an unequal number of  electrons and or protons could generally be  termed as ion.

Explanation:

i hope this will help you :)

Answer:

A magnetic jewelry clasp

Explanation:

The area of the house will be 146.78 in square meters

What we have given in the question is that there is one house whose area is measured in square feet which is 1580 square feet, and we have to convert that area in square meter.

Now, To convert the area in square meter we must divide the area given in square feet by a constant which is 10.764.

Area in square meter = Area in square feet / 10.764

Area in square meter = 1580 / 10.764 square meter

Area in square meter = 146.78 square mete

Thus we conclude that You must divide the area given in square feet by 10.764 to convert Square feet to Square meters and vice versa for the opposite and after calculation we found that area which is 1580 square feet will be 146.78 in magnitude in square meters

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Answer:

Acceleration

Explanation:

I am writing this because it must be 20 characters to submit

Explanation:

according to the first law of thermodynamics, the energy is always conserved. To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this, first law of thermodynamics states it as impossible to build perpetual motion machines.

Answer:

Explanation:

\(F = k \frac{Q}{r^{2}} \\10000 = 8.99 * 10^{9} * \frac{0.1}{r^{2}} => r^{2} = 8.99 * 10^{5} * 0.1 = 89900 => r = 299.83 m = 300 m\)

Answer:

The answer would be 299.83

Explanation:

Trust

ANSWER

EXPLANATION

Parameters given:

Mass of hockey puck, m1 = 0.3 kg

Mass of bottle, m2 = 1.4 kg

Initial velocity of hockey puck, u1 = 17 m/s (taking East as positive direction)

Initial velocity of bottle, u2 = 0 m/s

Final direction of bottle/puck = 40° South of East

To find the resultant velocity of the puck, we have to apply the principle of conservation of momentum, which states that:

This implies that the final momentum must be equal to the initial momentum.

Therefore:

where v represents the final velocity of the puck/bottle and cosθ indicates that the direction of the final velocity is at an angle θ.

Solve for v by substituting the given values:

That is the final velocity of the stuck puck.

(a) The work done by the donkey on the cart is 59,721.9 J.

(b) The work done by the force of gravity on the cart is -48,434.87 J.

(c) The work done on the cart by friction during this time is 11,315.12 J.

(a) The work done by the donkey on the cart is calculated as follows;

Wd = Fd cosθ

where;

Wd = 375 N x 163 m x cos(12.3)

Wd = 59,721.9 J

(b) The work done by the force of gravity on the cart is calculated as;

Wg =  Fg x d x cosθ

Where;

θ = 90⁰ + 4.03⁰ = 94.03⁰

Wg = (431 kg x 9.81 m/s²) x 163 m x cos (94.03)

Wg = -48,434.87 J

(c) The work done on the cart by friction during this time is calculated as;

Wf = Ff x d x cosθ

where;

Ff = μmg cosθ

Ff = 0.0165 x 431 kg x 9.81 x cos (4.03)

Ff = 69.59 N

Wf = 69.59 x 163 x cos (4.03)

Wf = 11,315.12 J

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Answer:

observed frequency =  109.68 Hz

Explanation:

given data

speed u = 20.9 m/s

frequency f = 103 Hz

solution

we consider here speed of sound (v)  is 343 m/s

so observed frequency is express as

observed frequency = f × \(\frac{v}{v-u}\)     ...............1

put here value and we get

observed frequency =  103 × \frac{343}{343-20.9}

observed frequency =  109.68 Hz

Answer:

The blade undergoes 40 revolutions, so neither of the given options is correct!

Explanation:

The revolutions can be found using the following equation:

\(\theta_{f} = \theta_{i} + \omega_{i}*t + \frac{1}{2}\alpha*t^{2}\)

Where:

α is the angular acceleration

t is the time = 2.5 s

\(\omega_{i}\) is the initial angular velocity = 1500 rev/min                

First, we need to find the angular acceleration:

\( \alpha = \frac{\omega_{f} - \omega_{i}}{t} = \frac{400 rev/min*2\pi rad*1 min/60 s - 1500 rev/min *2\pi rad*1 min/60 s}{2.5 s} = -46.08 rad/s^{2} \)

Now, the revolutions that the blade undergo are:

\(\theta_{f} - \theta_{i} = \omega_{i}*t + \frac{1}{2}\alpha*t^{2}\)

\(\Delta \theta = 1500 rev/min *2\pi rad*1 min/60 s*2.5 s - \frac{1}{2}*(46.08 rad/s^{2})*(2.5)^{2} = 248.7 rad = 39.9 rev\)        

Therefore, the blade undergoes 40 revolutions, so neither of the given options is correct!

I hope it helps you!                              

Answer:

a)  U = 506 J, b)  U = 37.11 J, c) U = 0

Explanation:

The gravitational power energy is given by the expression

         U = m g (y -y₀)

In general, a reference system is set that allows the expression to be simplified, in this case let's assume the reference system at the child's lowest point, therefore y₀ = 0

Let's use trigonometry to find the child's height

          h = y = L - L cos θ

we substitute

           U = m g L (1 - cos θ)

a) when the chain is horizontal θ = 90 and cos 90 = 0

           U = mg L

weight and mass are related

            W = mg

            m = W / g

           U = 230 2.20

           U = 506 J

b) θ = 33.0º

           cos 33 = 0.83867

           U = 230 (1 - 0.83867)

           U = 37.11 J

c) in this case θ = 0 cos 0 = 1

            U = 0

The spring constant, k, will be equal to 18 N/m. The spring constant is defined as the force-to-displaced-length ratio.

Spring constant is defined as the ratio of force per unit displaced length.

Given data;

Mass of  block,m=0.250 k

Amplitude,A = 0.125 m

Velocity,V=3.00 m/

Spring constant, K=?

The spring constant formula when the spring oscillates at the specified amplitude A:

\(\rm k= \frac{v_{max}^2 m}{A} \\\\ k =\frac{3.0 m/s^2 \times 0.250 \ kg}{0.125 \ m} \\\\ k=18 \ N/m\)

Hence, the spring constant, k will be 18 N/m

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During an earthquake, it is important to take appropriate steps to ensure safety

(i) When you are in the classroom

Drop, Cover, and Hold On: Quickly drop to the ground, take cover under a sturdy desk or table, and hold on to it to protect yourself from falling objects and potential structural collapse.

Protect Your Head: If possible, use your arms to cover your head and neck to provide additional protection.

Stay Indoors: Remain inside the classroom until the shaking stops and it is safe to exit. Be prepared for aftershocks, which are smaller tremors that may occur after the main earthquake.

(ii) When you are out of danger:

Evacuate to Open Space: If you are no longer in immediate danger, move quickly to an open space away from buildings, trees, streetlights, and utility wires that may pose a risk of falling or collapsing.

Watch for Falling Debris: Be aware of your surroundings and watch out for any hazards such as falling debris, broken glass, or damaged infrastructure.

Stay Clear of Buildings: Avoid entering damaged buildings or structures as they may be unstable. Keep a safe distance until authorities confirm it is safe to enter.

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Answer:

I don't know sorry I hope you find what your looking

The matching of each method of transferring electric charge with the correct description should be explained below.

The friction means the transfer of electric charge via rubbing. The conduction means the transfer of electric charge via the direct contact.

Also, the induction means the transfer of the electric charge without the direct contact.

In this way it should be matched.

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Answer:

this is the answer that is correct

a) Cart is speeding up ; b) cart is slowing down and c) cart is not moving.

Force of friction is a contact force whereas friction is the force that resists motion when surface of one object comes in contact with surface of another. Example is the force of friction between two stones rubbed with each other.

Static friction magnitude is directly proportional to normal force magnitude and the roughness between sliding surfaces. The ratio of magnitude of frictional force divided by normal force magnitude is called as coefficient of friction. Friction takes place at the point of contact between two bodies.

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Answer:

i know da way ese'

Explanation:

Answer:

A

Explanation:

Answer:

24.2 m/s

Explanation:

Mass is irrelevant in this situation....

Displacement:  ( to find time)

 x = xo + vo t - 1/2 at^2

 30= 0   + 0  - 1/2 (9.8)t^2

              t = 2.47 seconds

Velocity:

vf = a t   = 9.8 (2.473)  = 24.2 m/s

The magnitude of the initial acceleration of the object is 4.2 m/s².

The tension in the string once the object starts moving is 13.65 N.

The magnitude of the initial acceleration of the object is calculated by applying Newton's second law of motion as follows;

F(net) = ma

m₂g - μm₁g cosθ = a(m₁ + m₂)

where;

(4.75 x 9.8) - (0.535 x 3.25 x 9.8 x cos40) = a(3.25 + 4.75)

33.5 = 8a

a = 33.5/8

a = 4.2 m/s²

The tension in the string once the object starts moving is calculated as;

T = m₁a

T = 3.25 x 4.2

T = 13.65 N

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Net forces in all above cases will be

A) F net = 0

B) F net = 1 N

C) F net = 5 N

D) F net = 5N

E) F net  = 5 N

F) F net = 5 N

G) F net = 9.9 N

H) F net = 9.9 N

A) net force = upward force - downward force

                   = 4 - 4 = 0

B) net force = rightward force - leftward force = 4 - 3 = 1 N  

C) net force  

using Pythagoras theorem

F net =  \(\sqrt{4^{2} + 3^{2} }\) = \(\sqrt{25}\) = 5 N

D) F net = \(\sqrt{-4^{2} + (-3)^{2} }\) = 5 N

E) balancing horizontal forces

   rightward force - leftward force  = 5 - 2 = 3 N

   using  Pythagoras theorem

   F net =  \(\sqrt{4^{2} + 3^{2} }\) = 5 N

F) balancing vertical forces

   -5 + 2 = -3 N

    using  Pythagoras theorem

     \(\sqrt{(-4)^{2} +(-3) ^{2} }\) = 5 N

G) using  Pythagoras theorem

    F net = \(\sqrt{7^{2} + 7^{2} }\) = 9.9 N

H ) balancing horizontal forces

     10 - 3 = 7 N

     \(\sqrt{7^{2} + 7^{2} }\) = 9.9 N

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