Dr. Berenson's study showed that when obese children reach adulthood they are 8 times more likely to develop high blood pressure than healthy weight children.
Dr. BerensonDr. Berenson (September 19, 1922 – November 22, 2018) was an American cardiologist, heart researcher, and public health expert who specialised in determining the root causes of cardiac conditions. According to Dr. Berenson's foundational research, childhood routines and habits are the root cause of adult heart disease. He also found that compared to people with no cardiovascular risk factors, those with three or four cardiovascular risk factors had atherosclerosis that was noticeably more evident. Dr. Berenson began teaching at Tulane University after being released from the U.S. Navy in 1948. He started a two-year research fellowship at the University of Chicago in 1952, where Dr. Berenson worked on rheumatic fever investigations with Albert Dorfman, the department's chief.
According to dr. berenson's study, when obese children reach adulthood, how many times more likely are they have high-blood pressure?
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Write the vector u as a sum of two orthogonal vectors, one of which is the vector projection of u onto v, projvu u = , v =
The vector u represents the sum of two orthogonal vectors, and which can be written as,
[tex]u=Proj_vu+(u-Proj_vu)[/tex].
To find the answer, we have to know about the projection of vectors.
How to write u as a sum of two orthogonal vectors?Let u and v are two vectors, then the projection of the vector u onto the vector v is given by[tex]Proj_v u=\frac{u.v}{v.v} v[/tex] (inner product)
let[tex]u=(u_1,u_2)\\v=(v_1,v_2)[/tex] then, projection of u on v is,
[tex]Proj_vu=\frac{u_1v_1+u_2v_2}{v_1v_1+v_2v_2} (v_1,v_2)[/tex]
Then, u can be written as the sum of two orthogonal vectors as,[tex]u=Proj_vu+(u-Proj_vu)[/tex]
Thus, we can conclude that, the vector u represents the sum of two
orthogonal vectors, and which can be written as,
[tex]u=Proj_vu+(u-Proj_vu)[/tex].
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What is meant by a "chain reaction"?
What is the maximum velocity (in m/s) of electrons ejected from a material by 85 nm photons, if they are bound to the material by 4. 66 ev?
The maximum velocity of electrons is v = 3.20 × 10¹⁵ m/s
The wavelength of photons λ = 85 nm
W = 4.66 ev
What is photoelectric effect and how velocity of photoelectrons is calculated?The emission of electrons happened and absorbed through the electromagnetic radiation is said to be photoelectric effect.
Photoelectric cells, photodiodes works on the principle of photoelectric effect.
According to of photoelectric effect,
E = hν
Here, hc / λ = W + KE max
hc / λ = W + 1/2 mv² max
v² = sqrt of (( hc / λ - W) (2/m))
I cap denotes λ ,
substituting all the values,
v = sqrt of ( (6.623 × 10⁻³⁴ Js ) ( 3 × 10⁸ m/s) / (85 nm) - 4.66ev) (2/ 9.1× 10⁻³¹
v = sqrt of ((1.987800 × 10⁻²⁵ / 85 × 10 ⁹ ) - 4.66 ev ) ( 2.197 × 10³⁰)
v = sqrt of ((2.338588 × 10⁻³⁶) - 4.66 ev ) ( 2.197 × 10³⁰)3.2
v = 3.20 × 10¹⁵ m/s
Thus, the maximum velocity is calculated as v = 3.20 × 10¹⁵ m/s.
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How deep under the surface of a lake would the pressure be double that at the surface? (1 atm = 1.01 x 105 pa)
At depth of h = 10.31 m the surface of a lake would the pressure be double that at the surface
Liquid pressure is the increase in pressure at increasing depths in a liquid. This pressure increases because the liquid at lower depths has to support all of the water above it.
We calculate liquid pressure using the equation liquid pressure = density x acceleration due to g x depth in fluid.
At the surface of the lake , pressure Po is = 1.01 * [tex]10^{5}[/tex] Pa
to find = depth under the surface of a lake would the pressure be double that at the surface
Pressure under the surface will be = 2 * 1.01 * [tex]10^{5}[/tex] Pa = 2.02 * [tex]10^{5}[/tex] Pa
Pressure under the surface = Po + ( rho * g * h )
2.02 * [tex]10^{5}[/tex] = 1.01 * [tex]10^{5}[/tex] + (1000 * 9.8 * h)
1.01 * [tex]10^{5}[/tex] = 1000 * 9.8 * h
h = 10.31 m
At depth of h = 10.31 m the surface of a lake would the pressure be double that at the surface
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what are the importance of wedge?
A wedge is a machine and it is used for separating bodies.
The Wedge as a MachineThe wedge is a combination of two inclined planes. When the wedge is driven into a body by an effort force, a much larger force will be exerted to each side by the wedge surfaces.
What are the importance of wedge?
A wedge is used to separate bodies which are held together by large forces example of this scenario is splitting of timber. A wedge is a machine and the example of wedge - type of machine are;
AxesChiselKnivesCutting toolsNote that a thin wedge has a higher mechanical advantage than a short thick one.
Therefore, a wedge is a machine and it is used for separating bodies.
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A particle of mass 16kg travelling with a velocity of 10m/s is acted upon by a steady force of friction in a direction opposite that of its motion. Find the speed of the particle after 10 seconds if the force of friction is 25N.
The speed of the particle after 10 seconds is, 25.88m/s.
To find the answer, we have to know more about the equations of motion.
How to find the speed of the particle after 10s?It is given that,[tex]m=16kg\\u=10m/s\\t=10s\\f=25N[/tex]
It is clear from the question that, the motion is balanced by the frictional force. Thus, the acceleration will be,[tex]ma=f\\a=\frac{f}{m} =\frac{25}{16}=1.6m/s^2[/tex]
We have the equation of motion for the distance travelled as,[tex]S=ut+\frac{1}{2}at^2=(10*10)+(\frac{1.6*10^2}{2})=178.13m[/tex]
Thus, by another equation of motion connecting a, S, and u, we get the final speed after 10s as,[tex]v=\sqrt{u^2+2aS} =\sqrt{10^2+(2*1.6*178.13)} =25.88m/s[/tex]
Thus, we can conclude that, the speed of the particle after 10 seconds is, 25.88m/s.
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Find the critical value of t for a two-tailed test with 14 degrees of freedom using = 0. 5
The critical value of t for a two-tailed test with 14 degrees of freedom using = 0. 5 is ±164.5577.
In hypothesis testing, critical values are one of the two approaches which allow you to decide whether to retain or reject the null hypothesis.
The critical value approach consists of checking if the value of the test statistic generated by your sample belongs to the so-called rejection region, or critical region, which is the region where the test statistic is highly improbable to lie. A critical value is a cut-off value (or two cut-off values in case of a two-tailed test) that constitutes the boundary of the rejection region(s). In other words, critical values divide the scale of your test statistic into the rejection region and non-rejection region.
To determine critical values, you need to know the distribution of your test statistic under the assumption that the null hypothesis holds. Critical values are then the points on the distribution which have the same probability as your test statistic, equal to the significance level α. These values are assumed to be at least as extreme at those critical values.
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Suppose there were no solar wind. How would the appearance of a comet in our inner solar system be different?.
If there were no solar wind, then the appearance of a comet in our inner solar system would be different because it would have only one tail instead of two.
What is a comet?A comet is a celestial body that travels across the Universe and releases gases when warms by passing near the stars such as the Sun.
Comet tail is the result of gas and dust due to this process of warming, which is directly related to solar winds.
In conclusion, if there were no solar wind, then the appearance of a comet in our inner solar system would be different because it would have only one tail instead of two.
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In general, which lens had the largest overall magnification (enlarged more than reduced)?
Convex lens had the largest overall magnification .
In optics, It is a quantification of comparing the size of the image with respect to the size of the object. It gives us information about the image in terms of how large or small is the image formed. Magnification is defined as the ratio of the height of image to the height of object.
The convex lens has the largest overall magnification. To get maximum magnification by convex lens object must be placed between center of curvature and pole of the lens .
Magnifying glasses make objects appear larger because their convex lenses (convex means curved outward) refract or bend light rays, so that they converge or come together.
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When a metal is illuminated by light, photoelectrons are observed provided the light's wavelength is less than 669 nm. What is the metal's work function (also called the binding energy)?
When a metal is illuminated by light, photoelectrons are observed provided the light's wavelength is less than 669 nm. The work function will be 0.030 * [tex]10^{-17}[/tex] J
The work function (or work function) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.
When light of suitable frequency falls on a metal surface, electrons are emitted. These photo (light) generated electrons are called photoelectrons
h = 6.62 x [tex]10^{-34}[/tex] J/Hz
c = 3 * [tex]10^{8}[/tex] m/s
lambda = 669 * [tex]10^{-9}[/tex] m
work function = h*c/lambda
= 6.62 x [tex]10^{-34}[/tex] * 3 * [tex]10^{8}[/tex] / 669 * [tex]10^{-9}[/tex]
= 0.030 * [tex]10^{-17}[/tex] J
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Compute the velocity of an electron that has been accelerated through a difference of potential of 100 volts. express your answer in meters per second
The velocity of an electron that has been accelerated through a difference of potential of 100 volts will be 5.93 * [tex]10^{6}[/tex] m/s
Electrons move because they get pushed by some external force. There are several energy sources that can force electrons to move. Voltage is the amount of push or pressure that is being applied to the electrons.
By conservation of energy, the kinetic energy has to equal the change in potential energy, so KE=q*V. The energy of the electron in electron-volts is numerically the same as the voltage between the plates.
given
charge of electron = 1.6 × [tex]10^{-19}[/tex] C
mass of electron = 9.1 × [tex]10^{-31}[/tex] kg
Force in an electric field = q*E
potential energy is stored in the form of work done
potential energy = work done = Force * displacement
= q * (E * d)
= q * (V) = 1.6 × [tex]10^{-19}[/tex] * 100
stored potential energy = kinetic energy in electric field
kinetic energy = 1/2 * m * [tex]v^{2}[/tex]
= 1/2 * 9.1 × [tex]10^{-31}[/tex] * [tex]v^{2}[/tex]
equation both the equations
1/2 * 9.1 × [tex]10^{-31}[/tex] * [tex]v^{2}[/tex] = 1.6 × [tex]10^{-17}[/tex]
[tex]v^{2}[/tex] = 0.352 * [tex]10^{14}[/tex] m/s
[tex]v^{2}[/tex] = 35.2 * [tex]10^{12}[/tex]
= 5.93 * [tex]10^{6}[/tex] m/s
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If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy.
a. true
b. false
If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy. It is a true statement .
Kinetic energy is the energy that an object possesses due to its motion. It is basically the energy of mass in motion. Kinetic energy can never be negative and it is a scalar quantity i.e. it provides only the magnitude and not the direction.
According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in the kinetic energy.
According to the principle of conservation of mechanical energy, The total mechanical energy of a system is conserved i.e., the energy can neither be created nor be destroyed; it can only be internally converted from one form to another if the forces doing work on the system are conservative in nature.
since, potential energy is stored in the form of work done
Work done = Fs cos (theta)
If force always acts perpendicular to an object's direction of motion
theta = 90 °
cos (90 ) = 0
Work done = 0
since , there is no work done , hence kinetic energy will not change
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Select the correct answer. which of these is a scalar quantity? a. acceleration b. displacement c. length d. velocity
Answer:
length
Explanation:
What is entered in block 24j of the cms-1500 claim if the provider is a member of a group practice?
What is entered in block 24j of the cms-1500 claim if the provider is a member of a group practice is national provider identifier (NPI).
What is national provider identifier (NPI)?A National Provider Identifier is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services.
What is block 24j?The box 24j Shaded is used to identify the non-NPI if indicated by a qualifier in 24i.
The box 24j displays the NPI of the Rendering Provider.
Thus, what is entered in block 24j of the cms-1500 claim if the provider is a member of a group practice is national provider identifier (NPI).
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Consider the diver and the diving board. which object exerts the action force? which object exerts the reaction force? in what direction does the action force push? in what direction does the reaction force push?
action force by Diver, the reaction force is by Diving board, direction of action force is down, direction of reaction force is up.
What is Action and Reaction force?Forces, often known as action and reaction forces, always act in pairs. The force exerted by the initial action on an item is known as the action force, and the force exerted in the opposite direction by the object is known as the reaction force.
Which object exerts the action force?
diver
Which object exerts the reaction force?
diving board
In what direction does the action force push?
down
In what direction does the reaction force push?
up
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Answer:
Which object exerts the action force?
diver
Which object exerts the reaction force?
diving board
In what direction does the action force push?
down
In what direction does the reaction force push?
up
Explanation:
I WILL MARK YOU BRAINLIEST IF YOU CAN ANSWER THIS QUESTION.
Answer:
23.07°
Explanation:
sorry the picture is a little messy!! in a car ride haha. hope this helps!<3
A 4. 137-m long pipe is in a room where the temperature is 16. 164 oc. what is the frequency of the third harmonic if the pipe is closed at one end?
The frequency of the third harmonic if the pipe is closed at one end is = 102.93 Hz.
How can we find the frequency of the third harmonic if the pipe is closed at one end?To find the frequency of the third harmonic if the pipe is closed at one end, we use the formula,
[tex]f_{n} =nf_{1}[/tex]=[tex]n\frac{v}{4L}[/tex] , in this case n= 1,3,5,7,9.....
Here we are given,
L= The length of the pipe = 4.137 m.
v= speed of the sound at 16.164°C .
[tex]v_{0}[/tex]= speed of the sound at 0°C.=331 m/s
Before finding the frequency we have to find the speed of the sound at 16.164°C. To find v, we are using the formula,
[tex]v=v_{0 } \sqrt{\frac{T_{2} }{T_{1} } }[/tex]=[tex]331\times \sqrt{\frac{(273+16.164) }{273 }[/tex]=340.65 m/s.
We have to find the frequency of the third harmonic, so according to the question, n=5
Now we put the known values in the first equation, we can find that
[tex]f_{n}=n\frac{v}{4L}[/tex]
Or,[tex]f_{n} = 5\times\frac{340.65}{4\times 4.137}[/tex]=102.93 Hz.
Therefore, from the above calculation we can conclude that if the pipe is closed at one end the frequency of the third harmonic is 102.93 Hz.
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Calculate the wavelength of an electron (m = 9. 11 × 10^-28 g) moving at 3. 66 × 10^6 m/s
The wavelength of an electron (m = 9. 11 × 10^-28 g) moving at 3. 66 × 10^6 m/s will be 0.197 * [tex]10^{-12}[/tex] m
De Broglie wavelength is an important concept while studying quantum mechanics. The wavelength (λ) that is associated with an object in relation to its momentum and mass is known as de Broglie wavelength. A particle's de Broglie wavelength is usually inversely proportional to its force.
momentum (p) = mv
DE Broglie wavelength = lambda = h / p
where
h = plank's constant
m = mass of electron
v = velocity of electron
lambda = h / mv
= 6.633 * [tex]10^{-34}[/tex] / 9. 11 × [tex]10^{-28}[/tex] * 3. 66 × [tex]10^{6}[/tex]
= 0.197 * [tex]10^{-12}[/tex] m
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What is the maximum electric field strength in an electromagnetic wave that has a maximum magnetic field strength of (about 10 times earth’s magnetic field)?
The maximum electric field strength in an electromagnetic wave that has a maximum magnetic field strength of 5 × 10^-4 T (about 10 times earth’s magnetic field) is 15 × 10^4 V/m
Given,
Maximum magnetic field strength, [tex]B_{max}[/tex] = 5 × 10^-4 T
Then,
Maximum electric field strength, [tex]E_{max}[/tex] = [tex]B_{max}[/tex] c
Where, c is the speed of light
Substituting all values in formula, we get,
[tex]E_{max}[/tex] = 5 × 10^-4 × 3 × 10^8
= 15 ×× 10^4 V/m
Concept
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How do the current and coltage readings compare to before the wires were switched. Explain how to interpret them physically?
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Which best explains the forces acting on the objects?
Objects W and X have balanced forces, and objects Y and Z have unbalanced forces.
Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.
Objects X and Y have balanced forces, and objects W and Z have unbalanced forces.
Objects X and Z have balanced forces, and objects W and Y have unbalanced forces.
The option that best explains the forces acting on the objects is that option b. Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.
How do you know if forces are balanced or unbalanced?When the motion of an object is said to be altered, the forces are known to be in a sate that is seen as unbalanced.
Note that Balanced forces are said to be one that are equal in size and also opposite in direction.
Hence, if forces are balanced, there is no alteration in motion and it is seen in cases if a person is pushed or pulled on an object that is seen from opposite directions but also has the same force.
Therefore, The option that best talks about the forces acting on the objects is that option b. Objects W and Y have balanced forces, and objects X and Z have unbalanced forces as it does better justice to it.
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Suppose i create a two-slit interference pattern using light with some wavelength lambda and slits with some separation d. If i were to increase lambda, what would happen to the interference pattern on the wall?.
If we increase the wavelength (λ), fringe width will increase and the interference pattern on the wall will spread out.
What is two - slit interference?The double or two-slit interference is a demonstration that light and matter can display characteristics of both classically defined waves and particles.
It also displays the fundamentally probabilistic nature of quantum mechanical phenomena.
During a two-slit interference experiment, a beam of light is aimed at a barrier with two vertical slits.
The fringe width is given by the relationfringe width = λ L / D
where;
λ is wavelength of light used, L is distance of wall from the source of light and D is slit separation.Thus, if we increase the wavelength (λ), fringe width will increase and the interference pattern on the wall will spread out.
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Which is expected to happen during El Niño?
A) Drought conditions in Australia
B) Cool temperatures in the equatorial Pacific
C) An increase in the pressure gradient
D) Unusually high fish yields in Peru
A. Drought conditions in Australia are expected to happen during El Niño.
What is El Nino?El Niño is a normal cycle occurrence of a change in temperatures on the surfaces of the central equatorial, and east equatorial waters of the Pacific Ocean.
The result of this phenomenon which changes the weather condition taking place on the surfaces of the Pacific Ocean is a change in the climate temperatures around the globe, and also the development of weather changes that will affect different parts of the world in different ways.
Hence, drought conditions are a period of time when an area or region experiences below-normal precipitation and El Nino's normal cycle's occurrence changes temperature.
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A resistor dissipates 2. 00 ww when the rms voltage of the emf is 15. 0 vv. part a at what rms voltage will the resistor dissipate 14. 0 ww ?
At rms voltage ([tex]V_{rms}[/tex]) = 39.59V resistor will dissipate 14.0W.
The term "alternating current" (AC) describes a current in which the voltage and current both take the shape of sinusoidal waves. Root mean square value is indicated by the letter "rms." Both the mean voltage and mean current of an alternating circuit are represented by it.
Also, power dissipated is
P = [tex]V^{2} _{rms}[/tex] / R
2 = [tex]15^{2}[/tex] / R
2 = [tex]\frac{225}{R}[/tex]
R = 112Ω
If P = 14 W,
[tex]V^{2} _{rms}[/tex] = PR
[tex]V^{2} _{rms}[/tex] = 14×112
[tex]V^{2} _{rms}[/tex] = √1568 = 39.59V
Therefore, at rms voltage ([tex]V_{rms}[/tex]) = 39.59V resistor will dissipate 14.0W.
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How should the magnetic field lines be drawn for the magnets shown below?
Option B is the correct answer that show how magnetic field lines should be drawn for the magnets shown in the figure.
What is Magnetic Line of Force ?The Magnetic Line of Force of a magnet is defined as the line along which a free N - pole would tend to move if placed in the field of a line such that the tangent to it at any point gives the direction of the field at that point.
When the two unlike poles are placed to each other, there will be attraction. And when the two like poles are placed to each other, there will be repulsion. The reason is that the line of force tend to move from the north pole to the south pole.
From the given diagram, the two magnets are of the same south pole. They are of like pole and there will be repulsion between the two magnets.
Therefore, Option B is the correct answer that show how magnetic field lines should be drawn for the magnets shown in the figure.
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Answer: B
Explanation:
I got the question right
Describe the usefulness or inconvenience of frictional force by turning a door knob.
The cylinder is pulled in the direction of the knob's turn. If the knob is not twisted, a latch at the end of the cylinder that extends into a recess in the doorframe stops the door from being opened.
What is Frictional force ?The opposing force that is produced when two surfaces attempt to move in the same direction or in opposite directions is known as frictional force. A frictional force is primarily intended to produce resistance to the mobility of one surface over another.
Between solid surfaces, there is friction that is static, sliding, and rolling. The three types of friction are ranked from strongest to weakest: rolling, sliding, and static. Fluids experience fluid friction, which is liquid or gaseous.Learn more about Frictional force here:
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You found a thermometer in the Marketplace that you think will add more value to your visualizations than the gauge you are using. Which values will you have when you add the thermometer?
A thermometer visualization is often used to represent progress towards a goal, target, or limit.
A thermometer typically a vertical bar or column that resembles a thermometer, with a scale indicating the range of values.
As you mentioned, you are considering replacing a gauge with a thermometer for your visualizations.
The values that you would have when using a thermometer visualization would include:
Current Value: This is the data point you are tracking or measuring. It could be anything that you want to represent visually, such as sales, progress, temperature, etc.
Target or Goal: The value you are aiming to achieve. This represents the desired end point of your progress or measurement.
Maximum Value: The upper limit of the thermometer's scale. This could represent the maximum value that is possible or feasible for your data.
Minimum Value: The lower limit of the thermometer's scale. This sets the starting point for your visualization.
Scale Increments: The divisions on the thermometer that indicate different levels of progress. These could be marked with specific values or simply represent proportional divisions.
Units: The units in which your data is measured. For example, if you're tracking sales, the units could be dollars, while for temperature, it could be degrees Celsius or Fahrenheit.
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If a radioactive decay produced 2. 05 × 1011 j of energy, how much mass was lost in the reaction?
The mass lost in the reaction is 0.227 × [tex]10^{-5}[/tex] Kg
The energy that is released during a nuclear reaction can be related to the mass lost using the Einstein equation.
E = m[tex]c^{2}[/tex] by Einstein demonstrates that matter and energy are only two different manifestations of the same thing. It also demonstrates how much energy (E) can fit into a relatively small mass (m) of matter. Nuclear processes convert matter into energy, yet the combined amount of mass and energy remains constant.
Given that;
E = Δ[tex]mc^{2}[/tex]
Δm = [tex]\frac{ E}{c^{2} }[/tex]
Δm = 2. 05 × 10^11 J/( 3 × 10^8)^2
Δm = 0.227 × [tex]10^{-5}[/tex] Kg
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During which stage of technological design did shuman identify that using oil and coal would be a problem?
First stage of technological design did shuman identify that using oil and coal would be a problem.
What is part of the first stage in the process of technological design?
The technological design process involves the steps of identifying an issue, researching it, coming up with potential solutions, choosing the best one, building a model, testing it, making adjustments as necessary, and communicating the final answer.
What is part of the fourth stage in the process of technological design?
The four stages of technological design include identifying a need, designing and implementing a solution, and evaluating the solution.
Steps in the Technological Design Process-
Identify the problem. For any new technology to come into existence, there needs to be a need or a desire. Research the problem.Generate possible solutions.Select the best solution.Learn more about Technological Design Process
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Q.9 And Q.10 correct answer with explaination
The option c will be correct in Q10.
What is angular velocity?Time rate at which an object rotates about axis or at which angular displacement between two bodies changes.
We have given is
r=4i , angular acceleration = 4j
v= radius×angular acceleration
v= 4i ×k
v=16j
When we cross i× k = j
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