The rationale underlying this hypothesis is that carrying the loads on the arms is dominated by passive dynamics.
The moment of inertia of the lower limb by passive dynamics.
Explanation:
This hypothesis is supported by the reasoning that, if passive dynamics predominates when loads are carried on the arms, then passively swinging a load should be less expensive than actively swinging a load when it is carried on the legs (Browning et al., 2007; Royer and Martin, 2005).
Because carrying loads close to the body's COM has typically been observed to be the least expensive way to carry loads while walking (Browning at all., 2007; Royer and Martin, 2005; Soule and Goldman, 1969)
We also hypothesized that carrying loads on the swinging arms would be more expensive than carrying loads near the COM (positioned about the waist in this study).
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A hydrogen atom in the n=6 state decays to the n=3 state. what is the wavelength of the photon that the hydrogen atom emits? use hc=1240 nm ev.
The wavelength of a photon that the hydrogen atom emits is 1.093 x 10^-8 m.
The wavelength of a photon is given by the following formula,
1/λ = R{1/n1^2- 1/n2^2}
Here λ is the wavelength of the photon
R is the Rydberg Constant= 1.097 x 10^7 m
N1 is the initial state
N2 is the final state
Putting n1 =3, n2= 6 in the above equation, the wavelength lambda comes out to be,
1/λ = R{1/(3)^2 - 1/(6)^2}
λ = 12/1.097 x 10^7
Lambda = 1.093 x 10^-8 m.
Hence, the wavelength of the photon that the hydrogen atom emits is 1.093 x 10^-8 m.
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A ball thrown horizontally at 14.2 m/s from the roof of a building lands 36.0 m from the base of the building. how high is the building.?
The height is 31.61 m of the building in which ball thrown horizontally.
Calculation :
x(t) = x₀ + v₀t +(1/2) a₀t²
once the ball is thrown it immediately starts falling
so h = (1/2)gt² where g is the gravitational acceleration
t =d/v
d = 36 meters
v= 14.2 m/s
so t = 2.54 seconds
plugging t into h =(1/2)gt²
g = 9.8 m/sec²
h = (1/2)(9.8)(2.54)2 = 31.61 meters
What are components of motion?
What Are the Three Laws of Motion of Newton The Law of Inertia, the Law of Mass and Acceleration, and the Third Law of Motion are Newton's three laws of motion. A body in motion continues to move in a straight line whereas a body at rest stays in its state of rest unless some external force acts to change it.
The phenomenon of an item changing its location with respect to time is known as motion in physics. Mathematically, displacement, distance, velocity, acceleration, and speed are used to explain motion.
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Which patient would be considered a good candidate for hyperbaric oxygen therapy?
Hyperbaric oxygen treatment includes inhaling pure oxygen in a pressured atmosphere. Hyperbaric oxygen therapy is a well-established treatment for decompression sickness, a possible complication of scuba diving. Other diseases treated with hyperbaric oxygen therapy include significant infections, air bubbles in your blood vessels, and wounds that may not heal as a result of diabetes or radiation harm.
Hyperbaric oxygen treatment is used to treat a variety of medical disorders. And it is used in a variety of ways by medical institutes. If you have any of the following conditions, your doctor may recommend hyperbaric oxygen therapy: Brain abscess, arterial gas embolism, burns, carbon monoxide poisoning, crushing injury, sudden deafness, decompression sickness, exceptional blood loss anemia, gangrene, infection of skin or bone that causes tissue death, nonhealing wounds, such as a diabetic foot ulcer, radiation injury, skin graft or skin flap at risk of tissue death, traumatic brain injury, sudden and painless vision loss.
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If the temperature of a gas is increased by 8x, what will happen to the volume?
Answer:
P V = N R T ideal gas formula
P2 V2 = N R T2
P1 V1 = N R T1
Dividing equations at constant pressure
V2 / V1 = T2 / T1 = 8 the volume would increase by a factor of 8
What does a vector have that a scalar quantity doesn't have?
*
Vectors have magnitude and direction and scalars have only magnitude & have no direction .
The physical quantities which possess magnitude as well as direction are called vector quantities. Examples of vectors such as displacement, velocity , and acceleration. And the quantities which possess only magnitude are known as scalar quantities for example height, mass, area, and volume. Magnitude can be defined simply as distance or quantity. For example, magnitude may be used in such a way as, the comparison between the speeds of a car and a bicycle.Velocity of an object can be said as, the rate of change of displacement with respect to time of an object . Its unit is m/s and it is a vector quantity
V = Δx/Δt
In here , V is velocity , Δx is change in displacement and Δt is change in time of an object.
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Suppose you are on a cart, initially at rest, which rides on a frictionless horizontal track. If you throw a ball off the cart towards the left, will the cart be put into motion?.
If you throw a ball off the cart towards the left then the cart will move to the left .
How the cart moved to the left and what phenomena was into consideration?The cart is initially at rest, but then rides on a frictionless horizontal track.Throwing a ball towards the left will obviously put the cart into motion.The cart will start moving in left because the ball was thrown left.To balance the momentum of the ball in the opposite direction the cart started moving towards the left.The phenomena to understand this is the law of conservation of momentum.To know more about momentum and conservation visit:
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If the airspeed of the plane (its speed in still air) is 335.0 km/h, in which direction should the pilot head?
The plane's speed relative to the ground is 309.8 km/h.
Airspeed of the plane = 335 km/h
Speed of the wind toward the south = 80 km/h
The pilot should head in the direction,
OA= AB × cos θ
[tex]cos \: θ = \frac{OA}{AB}[/tex]
[tex] θ = cos ^{ - 1} (\frac{OA}{AB})[/tex]
[tex]cos \: θ = \frac{80}{335}[/tex]
θ = 75.5°
When the airspeed is 335 km/h the pilot must head 75.5° West or North.
The plane speed relative to the ground is,
OB = AB × sin θ
OB = 335 × sin (75.5°)
OB= 309.8 km/h
Therefore, the plane's speed relative to the ground is 309.8 km/h.
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What is the wavelength of the photon released when an electron in a hydrogen atom transitions from = 4 to = 1?
The wavelength released in transition energy is λ = 9.73 x 10¯⁸ m.
We need to know about transition energy to solve this problem. Electrons in a hydrogen atom can move to another level of energy. It is also called a transition. In this process, electrons will absorb or release their energy to move. The transition energy can be determined as
ΔE = E2 - E1
where ΔE is transition energy, E2 is the final state of energy and E1 is the initial state of energy.
The state energy of a hydrogen atom can be calculated by
E = -(13.6) / n² eV
E = h.c / λ
where n is the number of energy states, h is Planck constant (4.136 x 10¯¹⁵ eV/Hz), c is speed of light (3 x 10⁸ m/s) and λ is wavelength.
From the question above, we know that
n1 = 4
n2 = 1
By substituting the following parameter, we get
ΔE = E2 - E1
ΔE = -(13.6) / n2² - (-(13.6) / n1²)
ΔE = -(13.6) / 4² - (-(13.6) / 1²)
ΔE = 13.6 - 0.85
ΔE = 12.75 eV
Calculate the wavelength released
ΔE = 12.75 eV
h.c / λ = 12.75
4.136 x 10¯¹⁵ . 3 x 10⁸ / λ = 12.75
λ = 9.73 x 10¯⁸ m
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Blood is accelerated from rest to a speed of 27.5 cm/s in a distance of 1.75 cm by the left ventricle of the heart. determine the magnitude of the acceleration of the blood.
The blood that travel from rest to a speed of 27.5 cm/s in a distance of 1.75 cm has an acceleration of: 216.07 cm/s²
The formulas and procedures we will use to solve this exercise are:
a = (vf² - vi²)/2 * x
Where:
a = accelerationvi = initial velocityvf = final velocityx = distanceInformation about the problem:
vi= 0 cm/sx= 1.75 cmvf= 27.5 cm/sa=?Applying the acceleration formula we have:
a = (vf² - vi²)/2 * x
a = [(27.5 cm/s)² - (0 cm/s²)] /2 * 1.75 cm
a = [756.25 cm²/s² - 0 cm²/s²] /3.5 cm
a = [756.25 cm²/s² ] /3.5 cm
a = 216.07 cm/s²
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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If a container of gas is at rest, the average velocity of molecules must be zero. yet theaverage speed is not zero. explain.
To consider the molecule in gas at rest, suppose a container of gas at rest.
We know that velocity is a vector quantity and it includes direction but speed is a scalar quantity and it does not include a direction.
Although the molecules are moving around a lot, they are only moving around within the fixed walls of the container. As the container isn't moving (given), the net velocity of the gas molecules is zero. Think about their random movements as vectors, then think about adding up all those vectors over time. They cancel each other out over time. So, the average velocity of a molecule in gas at rest is zero.
But it's only the directions that cancel each other out, which is why the average speed (ignoring direction) is non-zero.
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A room is heated by an iron that is left plugged in. is this work interaction? take the entire room, including the iron, as the system.
It is a work interaction because the electrons are crossing the system boundary, thus doing electrical work.
Work will be defined as intricate patterns of interpersonal communication amongst interdependent people. All interaction places restrictions on individuals involved while also allowing them to do things they otherwise would not be able to.
Verbal, bodily, phone, and written communication are the four basic methods used in the workplace. You always have to deal with at least one at any given time during the working day.
Beneficial relationships at work have been demonstrated to increase job satisfaction and have a positive impact on staff turnover since employees who feel supported by their coworkers are more likely to stay with a company over the long run (Hodson, 2004; Moynihan & Pandey, 2008).
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What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: potassium
The symbol of the element Potassium is K, its proton number is 19, its atomic mass is 39, its electron number is 19 and finally Potassium belong to period 4 of the periodic table.
What is an Element?This is defined as a substance cannot be further broken down by any chemical reaction and examples include oxygen, nitrogen etc.
Potassium is an element and has an atomic number of 19 with a mass number of 39 and is present in period 4 in the periodic table.
For all atoms with no charge, the atomic number is equal to the number of proton. The number of proton is also equal to the number of electron which is why they all have the same value of 19.
Neutron = atomic mass - atomic number
= 39 - 19 = 20
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The length between two given vectors is called what?
explain please
A farmer measures the distance around a rectangular field. The length of each long side of the rectangle is found to be 40.44 m, and the length of each short side is found to be 24.0 m. What is the total distance around the field, to the correct number of significant figures?
The distance around the rectangular field is 128.88 m.
What is perimter?Perimeter is the total distance around an object.
To calculate the perimeter/ total distance around the rectangular field, we us the formula below.
Formula:
P = 2(L+W)........... Equation1Where:
P = Total distance around the rectangular field.L = Length of the long sideW = Length of the short side.From the question,
Given:
L = 40.44 mW = 24.0 mSubstitute these values into equation 1
P = 2(40.44+24)P = 2(64.44)P = 128.88 mHence, the distance around the rectangular field is 128.88 m.
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The ability to buy a soda from a vending machine demonstrates which element of the marketing mix?
It demonstrates the place/distribution element.
Place, or its more popular name “distribution,” refers to the method by which a company delivers its goods to clients. It is one thing to have a fantastic product that is priced reasonably.
Which four forms of distribution are there?Direct selling, selling through intermediaries, dual distribution, and reverse logistics channels are the four different categories of distribution channels.
What does distribution or place mean in marketing?Distribution (or place) is one of the marketing mix’s four components. Making a good or service accessible to any consumer or any business user who is in requirement of it is the process of distribution.
The producer or service provider may carry this out directly or through indirect channels, such as distributors or intermediaries.
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Which cells have plasma membranes that undergo voltage changes in response to stimuli?
Neuron and muscle cells have plasma membranes that undergo voltage changes in response to stimuli.
What is a neuron?Neurons are messengers of information.
Between various brain regions and between the brain and the rest of the nervous system, information is transmitted using electrical impulses and chemical signals.
A neuron has a cell body that includes a nucleus and cytoplasm, from which long, thin hair-like structures emerge.
The axon, a solitary long component of the neuron, is responsible for carrying the nerve impulse to various body areas.
The dendrites are the neuron's small, branching body sections.
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An example of mechanical work is ________; an example of transport work is _______.
An example of mechanical work is the contraction of muscles; an example of transport work is the pumping of ions across the cellular membranes.
Generally, our cells can perform three major types of work which include chemical work, mechanical work as well as transport work.
A chemical work example is the building of proteins which are considered large molecules. The energy required for the dehydration synthesis reaction is provided by ATP which is able to link amino acids together.
One of the major examples of mechanical work is the activity of contraction of muscles. In the muscle cells, phosphate groups are transferred to certain proteins by ATP. These proteins are able to change the shape, which can start a series of events that makes the contraction of muscle cells.
On the other hand, a transport work example includes the activity of pumping solutes including ions to pass across a cellular membrane. Here again, there will be a transfer of a particular phosphate group from ATP that makes the respective receiving membrane protein so as to change shape as well as enable ions to pass through effectively.
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A frictionless 300 n sled is being pulled by two sled dogs. blanco pulls forward with a force of 110 n and red pulls forward with a force of 130 n. what is the net force acting on the sled?
The net force is 240 N.
We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as
R = F1 + F2 + ... + Fn
where R is force resultant (net force)
From the question above, we know that
F1 = 110 N
F2 = 130 N
The sled doesn't have friction force due to medium is frictionless.
Because the direction is the same, the force will add to each other.
R = F1 + F2
R = 110 + 130
R = 240 N
Hence, the net force is 240 N
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Can someone help me on this it’s for physics , the video did not help at all :(
Answer:
see attached table
Explanation:
1 km (kilometer) = 1000 m (meters)
1 m = 100 cm (centimeters)
1 cm = 10 mm (millimeters)
Going the other way
1 mm = 0.10 cm
1 cm = 0.01 m
1 m = 0.001 km
It is easier to find the values on both sides of the given value and then successively convert using the conversion ratios
The graph indicates given values in bold blue and conversions in normal font
Will explain two of these
Row 2: Given 1500 cm
1500 cm = 1500 x 10 = 15,000 mm
1500 cm = 1500 / 100 = 15 m
15 m = 15 m/ 1000 = 0.015 km
Row 5: Given 0.002 m
0.002 m = 0.002/1000 = 0.000002 km
0.002 m = 0.002 m x 100 = 0.2 cm
0.2 cm = 0.2 x 0 = 2 mm
and so on
If+a+1.10+cm+thick+piece+of+lead+can+absorb+90.0%+of+the++rays+from+a+radioactive+source,+how+many+centimeters+of+lead+are+needed+to+absorb+all+but+0.031%+of+the+'s?
The thickness of the lead sheet that absorbs 99.69 % of the gamma rays is 4.497 cm.
The lead can absorb 90% of rays at the thickness =
1.10 cm
The intensity of the radiation is,
[tex]I = I _{0}e ^{ - ux} [/tex]
The coefficient of attenuation is
[tex]e ^{ - ux} = \frac{ I}{I _{0} }[/tex]
[tex] - ux = In \: ( \frac{ I}{I _{0} })[/tex]
[tex]= - \frac{1}{1.10} In \: (10)[/tex]
[tex] = \frac{1}{1.10} - In \: (0.1)[/tex]
= 0.667 cm—¹
The coefficient of attenuation is 0.667 cm—¹.
The thickness of the lead sheet that absorbs 99.69 % of the gamma rays is,
[tex]u = \frac{ - 1}{x}In \: \frac{ I}{I _{0} }[/tex]
[tex]0.667 = - \frac{1}{x} In(0.31)[/tex]
x = 4.497 I'm
Therefore, the thickness of the lead sheet that absorbs 99.69 % of the gamma rays is 4.497 cm.
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How many neutrons per second are emitted spontaneously from a 1 mg sample of 252cf?
2. how many neutrons per second are emitted spontaneously from a 1 mg sample of 248cm?
The number of neutrons per second are emitted spontaneously is [tex]2.3\times10^9[/tex] neutrons/mg-s.
An atom is made up of three distinct subatomic components. Protons, electrons, and neutrons are what they are. In an atom, protons and electrons are positively charged, while neutrons are uncharged or neutral entities. The masses and charges of each of these subatomic particles are known.
The number of atoms in 1 gm of Cf - IS
[tex]N= (1g)(10^{-3})(6.02\times 10^{23} atoms/mol)/252 g/mol[/tex]
[tex]=2.38\times 10^{21} atoms/gm[/tex]
The number of neutrons released per each fission is 3.73 and the fission probability per decay is,[tex]3.09\times 10^{-2}[/tex]
[tex]=(3.73)(2.38\times 10^{21})(8.318\times10^{-9})(3.09\times10^{-2})[/tex]
[tex]=2.28\times 10^{12 }[/tex]neutrons/g-s
Therefore the number of neutrons per second are emitted spontaneously is,
[tex]=2.28\times 10^{12 }[/tex]neutrons/g-s
[tex]=2.28\times 10^{12 }[/tex] neutrons/g-s([tex]10^{-3}[/tex]/1mg)
=[tex]2.13\times10^{9}[/tex] neutrons/mg-s
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The speed limit on some interstate highways is roughly 75 km/h.
(a) what is this in meters per second? m/s
(b) how many miles per hour is this? mi/h
The speed of 75 km/h expressed in:
(a) meters per second is: 20.83 m/s(b) miles per hour is: 46.59 mi/hTo solve this problem the we have to convert the units with the given information.
Information about the problem:
v = 75 km/hv(m/s) = ?1 h is equivalent to 3600 s1 mile is equivalent to 1609.34 m1 km = 1000 mBy converting the velocity units from (km/h) to (m/s) we have:
v = 75 km/h * 1000 m/ 1km * 1 h/3600 s
v = 20.83 m/s
By converting the velocity units from (m/s) to (mi/h) we have:
v = 20.83 m/s * 1 mile/1609.34 m * 3600 s/ 1h
v = 46.59 mi/h
What is unit conversion?
It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.
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If we ignore air resistance, a falling body will fall 16t2 feet in t seconds. what is the average velocity between t=5 and t=5.3? round your answer to two decimal places if necessary.
The average velocity between t=5 and t=5.3 262.4 m/s
The distance fallen s = 16t^2
The velocity v = [tex]\frac{d_{s} }{d_{t} }[/tex] = 32t
When we apply the values of t to the velocity v, we get
V1 = 32 x 8 = 256 m/s at time t = 8 seconds.
V2 = 32 x 8.4 at time 8.4 equals 268.8 m/s.
(V2 - V1)/2 = (268.8 + 256)/2 = 262.4 m/s is the average speed.
The concept of velocity refers to the rate and direction of motion of a point. For instance, the orientation of a circular path is always perpendicular to the line that connects a point to the centre of the circle. A point always advances down a route that is perpendicular to it (a radius).
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ruth throwsa baseball straight up at 17 m/s. what is balls velocity at .53 seconds
The velocity of the ball is 16.9 m/s at 0.53 seconds. The given velocity of 17 m/s is the moving/change in velocity and 0.53 seconds is the given time.
How to calculate the velocity when the velocity changes?to find the velocity let's 1st find out the acceleration using the formula
a = Change in velocity/time
a = 32.07 m/s²
Velocity = acceleration X Time
Velociy = 32.07 X 0.53
= 16.99 m/s
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write the principal of the conservative of energy
Answer:
The principle of energy conservation states that energy is neither created nor destroyed. It may transform from one type to another.
The objective lens is the lens at the top of the microscope that you view the specimen through. select one:
a. true
b. false
It is false that the objective lens is the lens at the top of the microscope that you view the specimen through.
The objective lens is not the lens at the top of the microscope through which you see the specimen; it is the eyepiece lens. The eyepiece lens is the lens at the top that you look through, and it normally has a 10x or 15x magnification. A tube connects them to the objective lenses. The objective lenses are the ones closest to the specimen being studied; they are placed right above the specimen due to their magnification powers, and they also produce the specimen's image. A microscope normally has three or four objective lenses, each with a power of 4x, 10x, 40x, or 100x.
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The electric potential along an x-axis is given by the expression v = ax - bx2, where a and b are constants. at what point on the x-axis is the electric field zero?
At x=1m point on the x-axis the electric field is zero when it is given by the expression v = ax - bx2, where a and b are constants.
How is electric potential determined?We will use the formula V = k * q / r to get the electric potential at any place A due to a single point charge.
Formula for electric potentialq stands for electrostatic charge, r for the separation between point charge and A, and k = 1 / 4 * * 0 for Coulomb's constant.
What is the potential V formula?V = k × [q/r]
Where, V stands for potential electric energy. point charge = q R is the distance from any place near the charge to the charge site.
Explain what the electric field isWhen charge is present in any form, a point in space has an electric field that is connected to it. The value of E, often known as the electric field strength or electric field, expresses the size and direction of the electric field.
Ex = - dV/dx = -(a-2bx) = 0
solving for x, we have
x=a/2b = [2V/m] / 2(1V/m^2)
= 1m
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A ball is thrown down from a bridge at time t = 0 and strikes the water below.
Which of the following graphs best shows the velocity of the ball after it is thrown?
Assume upward is the positive direction.
A ball is thrown down from a bridge at time t = 0 and strikes the water below. Assuming upward is the positive direction. The option D of the following graphs best shows the velocity of the ball after it is thrown.
What is velocity?Velocity is a term defines that a particles covered distance upward positively and downward negatively in a constant time. It is a vector quantity.
How can we calculate the velocity?According to the question, assuming upward is the positive direction body is thrown downwards so there is an initial velocity in that particle who's velocity is downwards or negative in other words.
So we are using the law, v=u+at
Here we know u is negative from the above discussion and there is also a is negative. where a means the acceleration due to gravity. So it acting downwards so its also negative.
Now the equation becomes,
v=(-u)-at
Or, v=-u-at
So from the above discussion, we can assume that the graph would be like the option D of the question. which is downwards in nature.
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What impulse occurs when the same force of 10 n acts on the cart for twice the time?
If the time interval is doubled with the force kept constant, the impulse is also doubled.
What is the definition of force?The definition of force in physics is that force is any kind of push or pull that is applied on a massed object changes its velocity.
An external force is a kind of agent that has the power to alter any type of resting or moving condition of a body. It has got its own direction and a magnitude.
What in science is a force?One thing experiences a force from another. There are both living things and non-living objects included in the concept of force.
All objects, living and non-living, have the ability to exert a force on or against another item, as well as have their actions affected by forces.
Newton, or as it is abbreviated as N, is the SI unit of force. The meter and unit are the foundation units that pertain to force.
What in elementary physics is an impulse?In physics, the term “impulse” is used to describe or quantify the impact of force acting gradually to alter an object’s momentum.
It is often stated in Newton-seconds or kilograms per second and is denoted by the symbol J.
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what was Ethan's velocity between 9:30 and 10:00, in km/hr?
Ethan's velocity between 9:30 and 10:00 in km/hr is 10.
Equation :To know the velocity of the in between 9.30 and 10,
Use the formula,
speed = distance / time
Given,
distance 1 = 10 km
distance 2 = 15 km
time = 30 min
v = ?
Putting values,
v = Δs/Δt
v = 15 - 10 / 30 min
v = 5 / 1800 sec
v = 5000 m / 1800 sec
v = 2.78 m/sec
Or,
v = 5 km / 0.5 h
v = 10.0 km/h
Velocity :The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.
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