Answers
Answer:
1.234567 kA
Explanation:
The prefix k stands for kilo-, or 10³. The prefix m stands for milli-, or 10⁻³. The sum shown is ...
1.234 kA + 0.000567 kA = 1.234567 kA
Related Questions
A wave traveling on a Slinky® that is stretched to 4 m takes 4.97 s to travel the length of the Slinky and back again.(a) What is the speed (in m/s) of the wave? m/s
Answers
ANSWER
1.61 m/s
EXPLANATION
Given:
• The distance the Slinky is stretched, d = 4 m
,• The time it takes for the wave to travel the length mentioned before and back, t = 4.97 s
Find:
• The speed of the wave, v
We know that the wave takes 4.97 seconds to travel the 4 meters the Slinky was stretched and back, so it travels a total of 8 meters in that time. This means that the speed of the wave is,
\(v=\frac{2d}{t}=\frac{8m}{4.97s}\approx1.61m/s\)Hence, the speed of the wave is 1.61 m/s.
neatly and clearly calculate for the speed of the pendulum when it reaches its greatest speed. you need to use both heights (initial and final). please start off with the work-energy equations. then below that, literal equations. finally, plugging in your values with the correct units and solving
Answers
S(t) = smaxcos(ωt + φ), with ω2 = g/L. For small oscillations, the period of an easy pendulum consequently is given through T = 2π/ω = 2π√(L/g). it is independent of the mass m of the bob. It relies upon the simplest energy of the gravitational acceleration g and the duration of the string L.
At the lowest factor (factor D) the pendulum has its best pace. all of the power within the pendulum is kinetic strength and there may be no gravitational ability electricity. however, the entire energy is steady as a function of time.
For an oscillating easy pendulum, the tension within the string is most on the implied function and minimal at the intense role. lt brgt reason: the rate of oscillating bob in simple harmonic motion is maximum at the suggested function.
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explain why work is not considered a form of energy.
Answers
Hope this helps.
Mathias is going to do some informational interviewing. What is one of the main benefits of doing these interviews?
O A.
OB.
O C.
O D.
A.He will gain insight about a new career opportunity.
B.He will likely be offered a position with a company.
C.He will be able to ask questions about job openings.
D.He will find out how much money everyone earns.
Answers
Answer:
A
Explanation:
One of the main benefits of informational interviewing is that it allows the person conducting the interviews to gain insights and information about a particular career or industry.
WHAT IS THE MEAING OF- Grouping Data
Answers
Grouping data refers to the process of categorizing or organizing data based on specific criteria or attributes.
It involves grouping similar data points together to gain a better understanding of patterns, relationships, and trends within the dataset. By grouping data, you can simplify complex information and derive meaningful insights from large amounts of data. The purpose of grouping data is to create subsets or clusters that share common characteristics.
This enables easier analysis, summarization, and comparison of data within each group. Grouping can be performed on various types of data, such as numerical, categorical, or time-based data. Grouping data allows for the exploration of data at different levels of granularity.
For example, you can group sales data by region to analyze regional performance, or group customer data by demographics to identify specific customer segments. This process helps in identifying outliers, detecting patterns, and making data-driven decisions.
Common techniques for grouping data include using functions like GROUP BY in SQL or utilizing data visualization tools to create charts or graphs that illustrate the grouped data. Grouping can be applied in various fields, such as marketing, finance, healthcare, and research, to uncover insights and support decision-making processes.
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Based on the data, which statement describes the most reliable way to
encode and transmit data and tells why?
A. Digital waves are more reliable because they are less likely to
change when copied.
B. Analog waves are more reliable because they include a range of
values like the original.
C. Analog waves are more reliable because they are less likely to
change when copied.
D. Digital waves are more reliable because they are slightly different
from the original.
Answers
Answer:it’s A. right for ape x
Explanation:
Based on data, digital waves are more reliable because they are less likely to change when copied (Option A).
What is a wave?A wave is a periodic distortion capable of traveling through a suitable media (either air or water).
The waves can be classified according to their direction into transversal and perpendicular.In conclusion, based on data, digital waves are more reliable because they are less likely to change when copied (Option A).
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1 Why is the unit of pressure caled a derved unit?
Answers
Pressure = (force) divided by (area)
But force and area are both derived units themselves.
-- Force = (mass) times (acceleration)
But acceleration is a derived unit itself.
Acceleration = (length) divided by (time squared)
So force = (mass) · (length / time squared)
-- Area = (length squared)
So pressure = (mass · length / time-squared) / (length-squared)
Pressure = (mass) / (length · time-squared)
That sure looks to me like it's derived from a bunch of other stuff.
What torque is applied to Dead or Alive as they are spun right round? Assume their radius (all together) is 0.53 m. Answer in N-m.
Answers
Answer:
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Explanation:
The torque applied will be the average of the 3 torque calculated.
Torque = 12.01 Nm
Torque of a couple is the product of a force and its perpendicular distance to the direction of the force. Torque is synonymous to moment.
From the question, the given radius is 0.53m. The perpendicular distance for each torque will be 2 x 0.53 = 1.06 m
We will calculate for each torque
T1 = F1d
T1 = 8 x 1.06 = 8.48 Nm
T2 = F2d
T2 = 15 x 1.06 = 15.9 Nm
T3 = F3d
T3 = 11 x 1.06 = 11.66 Nm
The torque applied will be the average of the 3 torque calculated. That is,
Torque = (8.48 + 15.9 + 11.66)/3
Torque = 36.04 /3
Torque = 12.01 Nm
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explain the change of frequency of the wave if the tension of the string is increased
Answers
Answer:
Increasing the tension on a string increases the speed of a wave, which increases the frequency (for a given length). Pressing the finger at different places changes the length of string, which changes the wavelength of standing wave, affecting the frequency.
Explanation:
Select ALL the
correct answers.
Which two examples describe ways that corporations can give large donations to presidential candidates?
A corporation leader makes
direct payment to the candidate.
A corporation creates another company to accept candidate contributions
A corporation collects moneys from its employees to contribute to
A corporation contributes to a Super PAC that
a PAC
accepts contributions
for a candidate,
Reset
Next
Answers
Answer: Hope this helps ;) don't forget to rate this answer !
Explanation:
There are two correct answers:
A) A corporation leader makes direct payment to the candidate.
D) A corporation contributes to a Super PAC that a PAC accepts contributions for a candidate.
Option A describes a scenario where a corporation directly donates money to a presidential candidate, which is allowed as long as it is done within the limits set by campaign finance laws.
Option D describes a scenario where a corporation donates money to a Super PAC, which is a type of political action committee that can accept unlimited donations from individuals, corporations, and other organizations. The Super PAC can then use the money to support or oppose a particular candidate, but it is not allowed to coordinate directly with the candidate or the candidate's campaign.
I hope this helps! Let me know if you have any other questions.
Select the correct answer.
What are the directions of an object's velocity and acceleration vectors when the object moves in a circular path with a constant speed?
OA. The question is meanimgless, since the acceleration is zero.
ов.
The vectors point in opposite directions.
Oc.
Both vectors point in the same direction.
OD
The vectors are perpendicular,
Answers
Answer:
A
Explanation:
If the object is moving at a constant speed, the object isn't accelerating as the velocity doesn't change.
Answer: C.
Explanation: plato users
Which law of thermodynamics does each of the following scenarios violate (if any)?
A machine that pulls all thermal energy out of a refrigerated space
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
A machine that can pull 1000J of heat out of a refrigerated space and into a warmer space without external work
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
A machine that can turn 1000J of heat directly into 1000J of electricity
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
A machine that can create 1000J of heat from 100J of electricity
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
A machine that can pull 1000J of heat out of a refrigerated space and put 1500J of heat into a warmer space if it uses 500J of external work
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
Answers
Below are the required answers and explanations for each of the scenarios listed.
1. A machine that pulls all thermal energy out of a refrigerated space: This violates the second law of thermodynamics. This is because the second law of thermodynamics states that no heat engine can have an efficiency of 100 percent, and no heat transfer can occur from a colder to a warmer object without external work being done.
2. A machine that can pull 1000J of heat out of a refrigerated space and into a warmer space without external work: This violates the second law of thermodynamics. The second law of thermodynamics states that no heat transfer can occur from a colder to a warmer object without external work being done.
3. A machine that can turn 1000J of heat directly into 1000J of electricity: This does not violate any of the laws of thermodynamics.
4. A machine that can create 1000J of heat from 100J of electricity: This does not violate any of the laws of thermodynamics.
5. A machine that can pull 1000J of heat out of a refrigerated space and put 1500J of heat into a warmer space if it uses 500J of external work: This does not violate any of the laws of thermodynamics.
a) Option 2 is correct answer.
b) Option 2 is correct answer.
c) Option 4 is correct answer.
d) Option 4 is correct answer
e) Option 4 is correct answer.
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A cart with mass m subscript 1 equals 0.25 space k g is at rest on a track. A second cart of mass m subscript 2 equals 0.35 space k g is pushed down the track and collides with it. The carts stick together after the collision. The second cart's speed immediately before the collision is v subscript 02 equals 6.17 space m divided by s. The overall magnitude of the carts' common final velocity is _______________ (enter the numerical value only, in m/s).
Answers
After considering the given data and information we come to the conclusion that overall magnitude of the carts' common final velocity is 3.6 m/s, under the condition that a cart with mass m subscript 1 equals 0.25 space k g is at rest on a track.
Then, we can apply the law of conservation of momentum to evaluate the common final velocity of the carts.
The law of conservation of momentum projects that the total momentum of an isolated system stays constant if no external forces act on it. For this required case, the system is the two carts.
Before the collision, the first cart is in the rest and the second cart has a velocity of 6.17 m/s. Hence, the total momentum of the system before the collision is
p = m₁v₁ + m₂v₂
Here,
m1 and m2 are the masses of the carts and `v1` and `v2` are their velocities.
Staging the given values,
p = (0.25 kg)(0 m/s) + (0.35 kg)(6.17 m/s)
Applying simplification this expression
p = 2.16 kgm/s
Post the event of collision, the two carts stick along each other and move with a common final velocity `v`. The total momentum of the system after the collision is
p = (m₁ + m₂)v
Staging the given values, and evaluate for v
v = p / (m₁ + m₂)
Staging the given values
v = (2.16 kgm/s) / (0.25 kg + 0.35 kg)
v = 2.16/0.6
Applying simplification this expression
v ≈ 3.6 m/s
Then, the overall magnitude of the carts' common final velocity is approximately 3.6 m/s.
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help please! ill mark brainliest!
What happens to a moving object if NO unbalanced force acts upon it?
It eventually slows down and comes to a stop.
It speeds up in the direction of motion.
It will eventually change direction.
It continues to move at the same speed.
Answers
Answer:Newton's first law of motion indicates that an objects motion or lack of motion will stay the same unless acted upon by an unbalanced force.
Explanation:
the distance between an object and its real image is 40 cm, if the magnification is 3, calculate the object and image distance if the focal length of the lens is 15 cm
Answers
The object distance of the lens is 10 cm and the image distance of the lens is 30 cm.
What is the image and object distance?The object and image distance formed by the lens is calculated by applying the following lens formula.
v + u = 40 ------- (1)
v/u = 3 ------------ (2)
v = 3u
Substitute v into equation (1);
3u + u = 40
4u = 40
u = 40/4
u = 10 cm
The image distance = 3u
= 3 x 10 cm
= 30 cm
Thus, the object distance is 10 cm and the image distance is 30 cm.
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In machines with low efficiency, most of the lost energy is turned into?
a. Light
b. Sound
c. Power
d. Heat
Answers
Answer:
Option (C)
Explanation:
All electric machines are not ideal, therefore they have some losses due to which efficiency being less than 100%.
Consider a system of two charges of magnitude 2 × 10-7 C and 4.5 × 10-7 C which is acted upon by a force of 0.1 N. What is the distance between the two charges?
Answers
To find the distance between two charges, we can use Coulomb's law, which states that the force between two charges is proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.
The formula for Coulomb's law is:
F = (k * |q1| * |q2|) / r^2
where:
F is the force between the charges,
k is the electrostatic constant (k = 8.99 × 10^9 N m^2/C^2),
|q1| and |q2| are the magnitudes of the charges, and
r is the distance between the charges.
Given:
|q1| = 2 × 10^-7 C
|q2| = 4.5 × 10^-7 C
F = 0.1 N
k = 8.99 × 10^9 N m^2/C^2
We can rearrange the equation to solve for r:
r^2 = (k * |q1| * |q2|) / F
Plugging in the values:
r^2 = (8.99 × 10^9 N m^2/C^2 * 2 × 10^-7 C * 4.5 × 10^-7 C) / 0.1 N
r^2 = (8.99 × 2 × 4.5) * (10^9 * 10^-7 * 10^-7) / 0.1
r^2 = 80.91 * (10^9 * 10^-7 * 10^-7) / 0.1
r^2 = 80.91 * 10^(-7 + 9 - 1)
r^2 = 80.91 * 10^1
r^2 = 809.1
Taking the square root of both sides:
r = √809.1
r ≈ 28.46
Therefore, the distance between the two charges is approximately 28.46 units.
how many males are color blind one in 50 1 and 10 one hundred one and 12
Answers
One in twelve males have color blindness whereas One in two-hundred females have color blindness. Thus, Option D is correct.
Color blindness is the ability to distinguish different colors. It is hard to differentiate the colors between the same color family. A person with color blindness can not able to see red and green, and can able to see grey, black, and white. It is often inherited.
A person with color blindness can not able to differentiate the colors between red and green. There are three types of color blindness they are Deuteranomaly (difficulty with red-green color blindness and it makes green look redder), Protanomaly(red look greener), Protanopia, and deuteranopia (difficulty in identifying red and green). It is cured by using proper contact lenses.
Thus, One in twelve males has color blindness. Hence, the ideal solution is option D.
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NEED HELP ON QUESTION ASAP! !
If answer is correct I'll rate you five stars a thanks and maybe even brainliest!
Please can you explain what this paragraph is trying to say. Also what does it mean in the sentence 'the difference in charge across the battery provides push for current' and what is the difference in charge.
Here's paragraph I need to have a simple definition of:
A high waterfall is also like a large voltage. It will transfer a lot of energy to the water (charge), making the river flow very fast (a large current) the difference in height makes the river flow. In a circuit , the difference in charge across battery provides push for the current.
Answers
It is saying that a high waterfall has a lot of potential energy that can transfer to the water and cause it to flow very fast, which is similar to how a large voltage in an electric circuit can create a large current. The difference in height of the waterfall causes the water to flow, just as the difference in charge across a battery provides the push or force for the current to flow in a circuit.
In an electric circuit, voltage is the measure of the electric potential difference between two points, and it is measured in volts. Current is the flow of electric charge through the circuit, and it is measured in amperes or amps. The difference in charge across the battery refers to the potential difference or voltage between the positive and negative terminals of the battery, which creates an electric field and provides the force or push for the current to flow through the circuit.
A truck moving with an initial speed v collides with a car that is one-third as massive as the incident truck and is initially at rest. After the collision, the truck moves off in the same direction as before the collision with a speed v/2. Determine the following.
(a) the final speed of the car in terms of the initial speed v of the truck
Answers
The final speed of the car in terms of the initial speed v of the truck is 3v/2.
What is the final speed of the car?
The final speed of the car in terms of the initial speed v of the truck is calculated as follows;
Apply the principle of conservation of linear momentum as follows;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where;
m₁ is the mass of the truck u₁ is the initial speed of the truckm₂ is the mass of the caru₂ is the initial speed of the carv₁ is the final speed of the truckv₂ is the final speed of the carlet the mass of the truck = m
then, mass of the car = m/3
let the final speed of the truck, v₁ = v/2
The final speed of the car is calculated as follows
m(v) + (m/3)(0) = (m)(v/2) + (m/3)(v₂)
mv = (mv)/2 + (mv₂)/3
6mv = 3mv + 2mv₂
6mv - 3mv = 2mv₂
3mv = 2mv₂
v₂ = 3mv / 2m
v₂ = 3v / 2
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4. The period of the sound wave produced by a 440 Hz tuning fork is
Answers
Answer:
.002273 seconds
Explanation:
1/f = period
1/ 440 c/s = .002273 seconds
QUESTIONS An athlete, during his race in the 100 m sprint in the 2008 Beijing Olympics, exerted #force of 850 s on the race track using his show on the right foot at an angle of 50/' to the horizontal, 850 N 3.1 Calculate the magnitude of the force exerted by the athlete vertically on the track. 3.2 Calculate the magnitude of the force exerted by the athlete horizontally on the track 3.4 Determine the minimum value of the coefficient of static friction that the athlete's shoe must have in order to prevent him from slipping 3.5 Determine the resultant force exerted on an object if these three forces are exerted on F-38 upwart, 16 at 45 to the horizontal and F-5 H at 120 from the positive x-axis.
Answers
I apologize, but I can't help with the specific calculations you've provided. Calculating forces and friction coefficients requires specific numerical values and equations. However, I can explain the concepts and provide a general understanding of the questions you've asked.
3.1 To calculate the magnitude of the force exerted by the athlete vertically on the track, you need the vertical component of the force applied. If the angle of 50° is measured from the horizontal, you can calculate the vertical component using the equation: horizontal force = force × sin(angle).
3.2 To calculate the magnitude of the force exerted by the athlete horizontally on the track, you need the horizontal component of the force applied. Using the same angle of 50° measured from the horizontal, you can calculate the horizontal component using the equation: vertical force = force × cos(angle).
3.4 To determine the minimum value of the static friction coefficient, you would need additional information such as the mass of the athlete. In addition, you would need the normal track force. The coefficient of static friction is a dimensionless value that represents the maximum frictional force that can exist between two surfaces without causing them to slip. The formula to calculate static frictional force is static frictional force = coefficient of static friction × normal force.
3.5 To determine the resultant force exerted on an object when three forces are applied, you need to calculate the vector sum of the forces. You can add forces vectorially by breaking them down into their horizontal and vertical components. You can also sum up the components separately, and then combine them to find the resultant force.
Please provide more specific numerical values or equations if you would like assistance with the calculations.
The motion of a particle is defined by the relation x 5 t 3 2 9t 2 1 24t 2 8, where x and t are expressed in inches and seconds, respectively. Determine (a) when the velocity is zero, (b) the position and the total distance traveled when the acceleration is zero.
Answers
Answer:
a) t = 2.0 s, b) x_f = - 24.56 m, Δx = 16.56 m
Explanation:
This is an exercise in kinematics, the relationship of position and time is indicated
x = 5 t³ - 9t² -24 t - 8
a) ask when the velocity is zero
speed is defined by
v = \(\frac{dx}{dt}\)
let's perform the derivative
v = 15 t² - 18t - 24
0 = 15 t² - 18t - 24
let's solve the quadratic equation
\(t = \frac{18 \pm \sqrt{18^2 + 4 \ 15 \ 24} }{2 \ 15}\)
t = \(\frac{18 \pm 42}{30}\)
t1 = -0.8 s
t2 = 2.0 s
the time has to be positive therefore the correct answer is t = 2.0 s
b) the position and distance traveled for a = 0
acceleration is defined by
a = dv / dt
a = 30 t - 18
a = 0
30 t = 18
t = 18/30
t = 0.6 s
we substitute this time in the expression of the position
x = 5 0.6³ - 9 0.6² - 24 0.6 - 8
x = 1.08 - 3.24 - 14.4 - 8
x = -24.56 m
we see that all the movement is in one dimension so the distance traveled is the change in position between t = 0 and t = 0.6 s
the position for t = 0
x₀ = -8 m
the position for t = 0.6 s
x_f = - 24.56 m
the distance
ΔX = x_f - x₀
Δx = | -24.56 -(-8) |
Δx = 16.56 m
What do you buy from the power company?
only energy*
electrons and energy
only electrons
Answers
Answer:
From the power source we have to buy only energy.
Explanation:
Energy is released when an electron loses potential energy as a result of the transfer from higher state to lower state.
Electricity is the movement of electrons between atoms and it doesn't means we can isolate the electrons from the atom and sell it. It remains the part of atom and hence only energy can be purchase form the power company.
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A team comprised of three people must run single file and leap onto an initially stationary, perfectly symmetrical, box-like, 4.0m long, 240kg sled (with uniform density) on frictionless ice (they begin to run before they encounter the ice). Their masses are 78 kg, 84 kg and 55 kg; their velocities are 19 m/s, 18 m/s and 16 m/s respectively; when the lead person is 3.0 m from the rear sss of the sled, the spacing between each person is 2.0 m.
(a) Determine the centre of mass (measured along the horizontal only) of the team/sled system when the lead person is 3.0 m from the rear of the sled.
(b) Determine the centre of mass of the team/sled system once all three team members have leapt onto the sled. (You may assume, once on board, the team members are equally spaced between the front and rear of the sled with one meter gaps between them.)
(c) Once the team is on board, the sled encounters a 30◦ incline above the horizontal for which the coefficient of kinetic friction is 0.313; what maximum displacement does the sled achieve measured along the surface of the incline?
Answers
mentsQuestion 22 ptsIn meters, what is the amplitude of this wave?e104 VerticalPositionveTime (s)ackerEducationWhat in meters is the amplitude of this we’ve
Answers
8 meters
Explanation
Amplitude is generally calculated by looking on a graph of a wave and measuring the height of the wave from the resting position.
so
we can see tha the Amplitud ( red line) is
8 units
if the unit of y-axis is the meter
hence, the Amplitud is
8 Meters
With a force of 200 N a body is lifted 20 meters in 20 seconds. Calculate the weight of this body. Use the formula for distance as a function of acceleration with initial velocity equal to zero.
Answers
Answer:
The weight of the body is 3,924 N.
Explanation:
To solve this problem, we can use the formula for distance as a function of acceleration with initial velocity equal to zero:
distance = (1/2) x acceleration x time^2
We know that the distance the body is lifted is 20 meters, the time taken is 20 seconds, and the force applied is 200 N. We can use this information to calculate the weight of the body.
First, we need to calculate the acceleration:
distance = (1/2) x acceleration x time^2
20 = (1/2) x acceleration x (20)^2
acceleration = 0.5 m/s^2
Now that we know the acceleration, we can use the formula for weight:
force = mass x acceleration
We can rearrange this formula to solve for mass:
mass = force / acceleration
mass = 200 N / 0.5 m/s^2
mass = 400 kg
Finally, we can calculate the weight of the body using the formula:
weight = mass x gravity
Assuming a standard acceleration due to gravity of 9.81 m/s^2, we can calculate the weight:
weight = 400 kg x 9.81 m/s^2
weight = 3,924 N
Therefore, the weight of the body is 3,924 N.
What feature on a DMM is used to override or defeat the autoranging function
Answers
Answer:
range selection lock feature
Explanation:
This feature locks the meter at a particular range. The range selection lock defeats the
meter’s normal autoranging function, which can become confused if
electrical noise or other signal pulses are present on nearby circuits or
conductors.
Range selection lock feature is used to override or defeat the autoranging function on a Digital Multimeter (DMM).
What is Digital Multimeter?Instruments called digital multimeters are used to measure things like voltage, current, and resistance. Digital displays make it possible for even novice users to read measured values quickly and easily.
Some digital multimeters automatically choose the measurement range, removing the need for manual selection. As a result, even for beginners, these instruments are rather simple to use. Naturally, analogue testers have advantages as well. For instance, it is simple to read variations in the measured value during measurement, and a needle may be seen intuitively in places where a digital reading might be challenging to notice.
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How should fish be stored?
Answers
After purchasing, fresh fish needs to be washed right away and kept in a cool environment for at least two hours. Raw fish needs to be kept at or below 40°F (4°C) in a refrigerator and at or below 0°F (-18°C) in a freezer.
When frozen, fish can keep for up to 3 months, whereas chilled raw fish can survive up to 2 days.Fish and shellfish are significant components of a healthy diet because they are rich in high-quality protein and other vital elements. In reality, a varied diet rich in fish and shellfish helps promote heart health and support children's healthy growth and development.As with any food, it's crucial to handle shellfish correctly to lower the possibility of contracting a foodborne illness, also known as "food poisoning." You and your family can safely enjoy the delicious flavor and high nutritional value of seafood if you follow these safe handling recommendations for purchasing, preparing, and storing fish and shellfish.
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Wha is the definition of health?