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Ray Of Light [21]
3 years ago
11

PLEASE HELP ME, I NEED THIS DONE AS SOON AS POSSIBLE.

Physics
1 answer:
forsale [732]3 years ago
3 0
Musculoskeletal

You use your musculoskeletal system extensively during exercise. Muscle fibers contract to shorten muscles in such a way that pivots bones around joints, resulting in the swinging arms and running legs of exercise. When you exercise, your muscles need more oxygen-rich blood and glucose. Your body must shift resources away from some body systems to meet this demand.

Nervous

Your nervous system plays an important role in exercise, predicting the level of activity and then routing resources to those body systems used during exercise. Your central nervous system increases your heart rate early on in exercise. Your nervous system also signals your muscles to take up more oxygen from the bloodstream, known as oxygen uptake.

Heart

Your cardiovascular system includes your blood vessels and your heart, which pumps blood to the rest of your body through those blood vessels. Cardiac output is the amount of blood your heart pumps. According an article published in Clinics in Sports Medicine, the typical person at rest has a cardiac output of five to six liters per minute. Your cardiac output must satisfy the metabolic needs of the body during exercise by providing the body with the oxygen-rich blood it needs to perform the physical activity. Your heart rises to the challenge by increasing the force at which it pushes blood through your blood vessels. Stroke volume, or the amount of blood pumped by one portion of the heart, increases by 30 to 40 percent when you go from a resting state to peak exercise.

Circulatory System

Your body must manage blood flow to meet the demand of active muscles while still supplying other vital organs the blood they need to function. During exercise, blood flow to your brain remains relatively constant while blood flow to your kidneys and spleen is cut in half. Blood flow to the muscles of your heart increases by four times during exercise and your body increases blood flow to your skeletal muscles by about ten times during physical activity. Scientists call this increase in blood flow to the cardiovascular and skeletal muscles exercise hyperemia. You experience vasodilatation and decreased vascular resistance when you exercise, which means your blood vessels expand to allow blood to flow more efficiently. Your systolic pressure, or the top number on a blood pressure reading, rises while your diastolic pressure falls.

Respiratory

Increased muscle activity calls on the lungs to produce more oxygen to muscle cells and to remove excess carbon dioxide from the body. There is a linear relationship between cardiac output and oxygen uptake – the more blood your heart pumps, the more oxygen your muscles take from the bloodstream. Exercise causes your respiratory rate to increase four to five times over your resting rate. Tidal volume, or the amount of air you inhale and exhale in a single breath, increases five to seven times.

Endocrine

Your endocrine stimulates certain responses around the body through the use of hormones which act like chemical messengers. Insulin, a hormone, stimulates muscles into taking up glucose from the bloodstream, which the muscles use for energy. Your endocrine system releases other hormones during exercise, such as thyroxine which speeds up metabolism and epinephrine. Epinephrine is beneficial to your cardiovascular system, according to Western Michigan University.

Your entire body gets involved when you exercise, even if that physical activity involves only one or two body parts. Understanding the body systems used during exercise helps you optimize your workouts.
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MrRissso [65]

Answer:

Explanation:

A Spring stretches / compresses when force is applied on them and they are governed by the Hookes Law which states that the force required to stretch or compress a spring is directly proportional to the distance it is stretched.

F = -kx

F is the force applied and x is the elongation of the spring

k is the spring constant.

negative sign indicates the change in direction from equilibrium position.

In the given question, we dont have force but we know that the pan is hanging. We also know from the Newton's second law of motion that

F=mg

Inserting this into Hooke's Law

mg=-kx

computing it for x,

-x=mg/k

This is the model which will tell the length of the spring against change in the mass located in the pan.

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3 years ago
A baseball has a mass of 0.145 kg. A professional pitcher throws a baseball 67 mi/h, which is 30.0 m/s. What is the magnitude of
Kamila [148]

The concept of momentum tells us that it is equivalent to the product between the mass and the velocity of the object, that is to say that in general it can be written as

p = mv

Where,

m = mass

v = Velocity

Our values are given as,

m = 0.145kg

v = 67mi/h = 30m/s

Replacing we have that,

p = (0.145)(30)

p = 12.45 kg\cdot m/s

Therefore the magniude of the momentum of the pitched baseball is 12.45 kg\cdot m/s

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They relate because the further up you go, the colder it gets, and the air pressure decreases the further up you go. The altitude temperature and the air pressure both decrease, and that is their relationship. Altitude temperature decreases, the higher you go, and air pressure also decreases, the higher up you go. Therefore, the lower down you go, the higher the air pressure, and the higher the altitude temperature.

Hope this helps and have a nice day:)
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A charge of 0.91 C is spread uniformly throughout a 25 cm rod of radius 4 mm. What are the volume and linear charge densities
Oxana [17]

The volume of the rod is 1.26×10⁻⁵ m³, and the linear charge density of the rod is 3.64 C/m

<h3>What is volume?:</h3>

This is the product of the height of a solid object and its crossectional area.

The Volume of the rod is can be calculated using the formula below.

Note: A rod has the shape of a cylinder.

Formula:

  • V = πr²h............... Equation 1

Where:

  • V = Volume of the rod
  • r = radius of the rod
  • h = height of the rod.

From the question,

Given:

  • r = 4mm = 0.004 m
  • h = 25 cm = 0.25 m
  • π = 3.14

Substitute these values into equation 1

  • V = 3.14(0.004²)(0.25)
  • V = 1.26×10⁻⁵ m³

<h3>What is linear charge density:</h3>

This is the ratio of the charge on an object to the length of the object.

The linear charge density of the rod can be calculated using the formula below.

  • D = Q/h.................... Equation 2

Where:

  • D = Linear charge density of the rod
  • Q = Charge on the rod.
  • h = height or length of the rod

From the question

Given:

  • Q = 0.91 C
  • h = 25 cm = 0.25 m

Substitute these values into equation 2

  • D = 0.91/0.25
  • D = 3.64 C/m

Hence, The volume of the rod is 1.26×10⁻⁵ m³, and the linear charge density of the rod is 3.64 C/m

Learn more about charge density here: brainly.com/question/14568868

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