Barry slides across an icy pond. The coefficient of kinetic friction between his
shoes and the ice is 0.15. If his mass is 83 kg, what is the force of friction
acting on him?
OA. 813 N
B. 1150 N
C. 122 N
D. 352 N

The wavelength of the ultrasound wave in 20 °c air is 1.715 * 10⁻⁵ m.

The frequency of sound is the number of complete oscillations per second.

The wavelength is the distance between successive positions in the wave.

Velocity of sound is the distance covered per second.

The frequency and wavelength of a wave are related by the formula given below:

The velocity of sound in 20°C air = 343 m/s

frequency of the sound wave = 2.00 × 10⁷ hz or 2.00 × 10⁷ s⁻¹

wavelength = velocity/frequency

wavelength = 343 /  2.00 × 10⁷

wavelength = 1.715 * 10⁻⁵ m

In conclusion, the wavelength of the ultrasound wave is determined from the ratio of the velocity and the frequency of the sound.

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The mentioned statement is true.

What is adaptive optics(AO)?

How can adaptive optics(AO) enhance a telescope's capabilities?

Therefore, it is concluded that the mentioned statement is true.

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All of the following are true statements about phosphor storage plate (PSP) imaging system imaging plates except they: should be autoclave.

An autoclave is a device used in industrial and scientific procedures that call for higher temperature and pressure in comparison to ambient temperature. Before doing surgery, autoclaves are used to sterilize the area. In the chemical sector, autoclaves are used to vulcanize rubber, cure coatings, and perform hydrothermal synthesis. Industrial autoclaves are employed in a variety of industrial settings, particularly in the production of composite materials. Depending on the size of the load and the contents, many autoclaves sterilize equipment and supplies by exposing them to pressurized saturated steam at 121 °C (250 °F) for 30 to 60 minutes at a pressure of 15 psi.

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Answer:

Approximately [tex]13\; {\rm N \cdot m^{-1}}[/tex] (assuming that [tex]g = 9.81\; {\rm N \cdot kg^{-1}}[/tex].)

Explanation:

Let [tex]F_{\text{s}}[/tex] denote the force that this spring exerts on the object. Let [tex]x[/tex] denote the displacement of this spring from the equilibrium position.

By Hooke's Law, the spring constant [tex]k[/tex] of this spring would ensure that [tex]F_\text{s} = -k\, x[/tex].

Note that the mass of the object attached to this spring is [tex]m = 540\; {\rm g} = 0.540\; {\rm kg}[/tex]. Thus, the weight of this object would be [tex]m\, g = 0.540\; {\rm kg} \times 9.81\; {\rm N \cdot kg^{-1}} \approx 5.230\; {\rm N}[/tex].

Assuming that this object is not moving, the spring would need to exert an upward force of the same magnitude on the object. Thus, [tex]F_{\text{s}} = 5.230\; {\rm N}[/tex].

The spring in this question was stretched downward from its equilibrium by:

[tex]\begin{aligned} x &= (70\; {\rm cm} - 110\; {\rm cm}) \\ &= (-40)\; {\rm cm} \\ &= (-0.40) \; {\rm m}\end{aligned}[/tex].

(Note that [tex]x[/tex] is negative since this displacement points downwards.)

Rearrange Hooke's Law to find [tex]k[/tex] in terms of [tex]F_{\text{s}}[/tex] and [tex]x[/tex]:

[tex]\begin{aligned} k &= \frac{F_{\text{s}}}{-x} \\ &\approx \frac{5.230\; {\rm N}}{-(-0.40)\; {\rm m}} \\ &\approx 13\; {\rm N \cdot m^{-1}}\end{aligned}[/tex].

In the pinball game, momentum is transferred from the plunger to the ball.

What is momentum?

Momentum is the quantity of motion of a moving body, measured as a product of its mass and velocity.

The formula of the momentum is: p = m*v

Here a pinball game machine is given.

We know that,

Hence,

In the pinball game, momentum is transferred from the plunger to the ball.

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The steps which enhance strengths and address limitations as a coach include:

This is referred to a professional who gives special training about a particular subject or topic.

It is best to identify weakness and work towards improvement through determination and consistency.

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The duty of the AHJ is to: (C). review installation designs and determine if they fall under Code jurisdiction

AHJ can be defined as that means Authority Having Jurisdiction

AHJ can be defined as an organization, office, or individual that are responsible for the issuance of permits, enforcing the requirements of a code or standard and  approving materials or a procedure.

In conclusion, The role of the AHJ are outlined in the paragraph above.

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Explanation:

by taking a brisk walking about 150 minutes

2 days a week exercise that strengths muscles

drinking water

B. The heat loss by the heat engine is 8,330 J.

The heat loss by the heat engine is calculated as follows;

H = E - W

where;

H = 10,750 J - 2,420 J

H = 8,330 J

Thus, the heat loss by the heat engine is 8,330 J.

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No, the use of a giant vacuum-like strainers is not an effective way to remove plastic because the patch tend to be very big and deep that it would need a lot of human effort or strength to filter the trash and the act would lead to disrupt of life in the water column.

Plastic is known to be a term that connote the  material that is made up of a key ingredient of an organic substance and it is made up of large molecular weight.

Note that It is also seen as polymers that belongs to long carbon chains. and there are a lot of waste disposal in the ocean which disrupt marine activities.

Hence, No, the use of a giant vacuum-like strainers is not an effective way to remove plastic because the patch tend to be very big and deep that it would need a lot of human effort or strength to filter the trash and the act would lead to disrupt of life in the water column.

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Power generation has to do with the process by which electricity is generated from various sources.

Power generation has to do with the process by which electricity is generated from various sources. Now we know that electricity is almost the driving force of several economies globally.

A coal fired power plant will lead to the burning of fossil fuels and the consequent release of CO2 into the atmosphere which leads to global warming. Also, the possibility of the release of SOx from the burring of coal could lead to acid rain.

In the case of nuclear sources, the disposal of the spent nuclear fuel presents a huge risk as well as the possibility of radioactive fallout and possible accident that could release tremendous amount of radiation.

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Mass is the same, weight is less

As we know that the mass of the object is the measurement of the quantity of the matter that is present in it

So here we can say that if the mass of the object is m then its total quantity of the matter that is present in it is given as

mass = (density) × (volume)

Now for the weight of the object is defined as the force of gravity due to planet

Fg = mg

so the weight of the object is depending on the acceleration due to gravity of the planet

As we know that the gravity of moon is smaller than the gravity of the earth so here weight on the moon will be smaller than the weight on the Earth

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The applied voltage is 1.41* 10⁴ kV.

Calculation of applied voltage-

The capacitance of parallel plates in the absence of a dielectric is:

C = ∈₀A/d

where, "d" = the spacing between the plates = 0.01 * 10⁻³ m

"A" = the area of the plates = 4 m²

"∈₀" = the constant = 8.85419*10⁻¹² C²/Nm²

So, C₀ = [tex]\frac{8.85419*10^{-12}*4 }{0.0100*10^{-3} }[/tex]

          = 3541.67 *10⁻⁹ F

The dielectric constant, κ= 3.4, is defined as:

κ = C/C₀

The effective capacitance (with the dielectric) is denoted by "C", whereas the original capacitance is denoted by "C₀". (without the dielectric).

As a result, the new capacitance is:

C = κC₀

However, capacitance is connected to a voltage by:

C = Q/V

utilizing the increased capacitance and accounting for "V":

κC₀ = Q/V

V = Q/κC₀ = [tex]\frac{0.170}{3.4 * 3541.67 *10^{-9} }[/tex] = 1.41* 10⁴ kV

Therefore the applied voltage is 1.41* 10⁴ kV.

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Air resistance (meeting space requirements)

Answer:

air resistance or A

Explanation:

The basic elements for every contract include

1) an offer,

2) acceptance,

3) Awareness

4) with legal capacity, for a legal purpose

A contract is an agreement between two or more parties, to perform a specific job or duty. A contract is usually temporary or of fixed duration and usually governed by a written agreement.

The basic elements every contract should contain are as follows:

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Several short trips taken from a cold start can use ...twice... as much fuel as a longer multi-purpose trip covering the same distance when the engine is warm.

In cold weather, properly designed gasoline aids in engine starting, while in hot weather, it helps prevent vapor lock. In order to meet the requirements of a modern engine, the fuel must have the volatility for which the engine's fuel system was built and an antiknock quality strong enough to prevent knock during routine operation.

During the intake phase, the air and fuel are combined before being introduced into the cylinder. The spark ignites the fuel-air mixture after the piston compresses it, resulting in combustion. During the power stroke, the piston is propelled by the expansion of the combustion gases.

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X and Y are two things that travel in the same direction. The mass of the things is the same. 5.0 m/s is the velocity of object x as it moves to the right. The velocity of object y to the left is 3.0 m/s. Objects x and y collide and adhere to one another. Following their collision, they both move at a speed of 1.0 m/s to the right.

Their velocity after colliding is 1.0 m / s to the right.

What is the velocity during the collision?

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Its silicon-32 because if you want to find an isotope, you have to add the number of protons (14) and number of neutrons (18) to get 32 as your total.

There are 23 known isotopes of silicon (14Si), with mass numbers ranging from 22 to 44. Stable isotopes include 28Si (92.23 percent), 29Si (4.67 percent), and 30Si (3.1 percent). The longest-lived radioisotope is Si-32, which is created by argon cosmic ray spallation.

silicon-32 has a half-life of about 150 years (with a decay energy of 0.21 MeV) and decays by beta emission to 32P (which has a half-life of 14.28 days) and then to 32S. Si-32 has the second longest half-life after Si-32, at 157.3 minutes. All others have half-lives of less than 7 seconds.

Bismuth, the 83rd element, was previously thought to have the heaviest stable isotope, bismuth-209, but in 2003, researchers in Orsay, France, measured the half-life of 209 Bismuth to be 1.91019 years. Only isotopes of technetium and promethium, as well as all elements with an atomic number greater than 82, are known to decompose via radioactive decay. Because no undiscovered elements are expected to be stable, lead is regarded as the heaviest stable element.

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True

In place of photographic plates or films, charge coupled devices, or CCDs, are sensitive photon detectors that can be employed in telescopes to create images. CCDs were created in the late 1960s and are now found in various devices, including digital cameras and photocopiers.

CCDs are more light-efficient, catch a greater proportion of incoming photons, can store and transfer digital data, and don't require development like film does. They respond linearly and capture up to 80% of the light that strikes them.

I understand the question you are looking for is this:

One of the primary advantages of CCDs over photographic plates is the former's high efficiency in detecting light. True or false.

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During primary second stage underwater recovery, it is acceptable to switch to your alternate air source while you search for your primary which makes it a true statement.

This involves the intermediate pressure air from the regulator hose being taken and reduced to ambient pressure.

Switching to your alternate air source  will ensure that the diver breathe safely which is why True was chosen.

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The mass at the other end of bar will be 50g .

what is mass

It is the fundamental property of matter , every single property which exist in this world has mass

Mass never can be 0 .

So , the system is in equilibrium

let mass of the body be m

55×5= m×5.5

m= 5 5 × 5 /. 5.5

m= 5 0g



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137.5 kg mass can be placed 2m away from the other end of the bar to keep the bar horizontally.

To keep the bar horizontal, the right and left side torques must be equal:

[tex]F_{1} d_{1} =F_{2} d_{2}[/tex]

[tex]F_{2} =F_{1} \frac{d_{1} }{d_{2} }[/tex]

    [tex]=(55.9.8)\frac{5}{2}[/tex]

    =1347.5 N.

Convert this force of gravity into mass:

[tex]F_{2} =m_{2} g,[/tex]

[tex]m_{2} =\frac{F_{2} }{g}[/tex]

     [tex]=\frac{1347.5}{9.8}[/tex]

     =137.5 kg.

The answer is 137.5 kg.

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The moment of inertia of the flywheel is 2.63 kg-[tex]m^{2}[/tex]

It is given that,

The maximum energy stored on the flywheel is given as

E=3.7MJ= 3.7×[tex]10^{6}[/tex] J

Angular velocity of the flywheel is 16000[tex]\frac{rev}{min}[/tex] = 1675.51[tex]\frac{rad}{sec}[/tex]

So to find the moment of inertia of the flywheel. The energy of a flywheel in rotational kinematics is given by :

E = [tex]\frac{1}{2}[/tex][tex]Iw^{2}[/tex]

By rearranging the equation:

I = [tex]\frac{2E}{w_{2} }[/tex]

I = 2.63 kg-[tex]m^{2}[/tex]

Thus the moment of inertia of the flywheel is 2.63 kg-[tex]m^{2}[/tex].

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The average acceleration of the particle in the time interval of 9.8 s is 10.204 m/s² opposite to the direction of motion.

Given:

Speed of particle, v₁ = 80 m/s (in positive x-direction)

Speed of particle, v₂ = -20 m/s (in opposite direction)

Time interval, Δt = 9.8 s

Calculation:

We know that, the average acceleration is given as:

a_avg = (v₂ - v₁)/ Δt     - ( 1 )

Applying values in above equation we get:

a_avg = (v₂ - v₁)/ Δt

           = (-20 m/s - 80 m/s) / (9.8 s)

           = -10.204 m/s²

Therefore the average acceleration of the particle in the time interval Δt is 10.204 m/s² opposite to the direction of motion.

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the answer is 47265.dug

Explanation:

im bot sure

The potential energy of the monkey at the given position is 600.9 J.

Potential energy is the energy stored in a body that depends upon the relative position of various parts of the body.

It increases with increase in the height of the object above the ground level.

The potential energy of the monkey is calculated as follows;

P.E = mgh

P.E = mg (L sin43)

where;

Substitute the given parameters and solve potential energy of the monkey

P.E = (16.9)(9.8)( 5.32 x sin 43)

P.E = 600.9 J

Thus, the potential energy of the monkey at the given position is 600.9 J.

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When driving on a highway, sudden strong cross wind gusts move a car sideways into another lane (option D).

A crosswind is a wind blowing across a line of travel.

Accidents have been reported to be caused by strong winds and can cause heavy distractions that will cause the driver to lose control.

However, a strong and sudden crosswind will cause the car to move sideways into another lane, and can lead to severe accident.

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A vehicle that weights 400 n on the surface of the earth is traveling in outer space at a speed of 400 m/s. It can be stopped by applying a constant force of 20 n for 800 secs.

Newtons 3 law whilst one object exerts pressure on any other object, the second object exerts a force on the first item this is identical in significance, but opposite in course; for each movement, there is an identical, but opposite response; referred to as the law of action-reaction.

You can use the equal formulation d = rt because of this distance equals the price instance's time. To solve for speed or rate use the components for pace, s = d/t this means that pace equals distance divided by way of time. To clear up for time use the components for time, t = d/s this means that time equals distance divided by way of velocity.

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In addition to ozone, the four other greenhouse gases or groups of greenhouse gases are included in nearly all the climate models are Carbon dioxide, water vapor, and methane, nitrous oxide.

Carbon dioxide, absorbs energy at a variety of wavelengths, a range that overlaps with that of infrared energy. As CO2 soaks up this infrared energy, it vibrates and re-emits the infrared energy back in all directions. About half of that energy goes out into space, and about half of it returns to Earth as heat, contributing to the ‘greenhouse effect.’

As methane is emitted into the air, it reacts in several ways. It reacts and  after oxidization methane forms water vapor and carbon dioxide. So, not only does methane contribute to global warming directly but also, indirectly through the release of carbon dioxide.

Nitrous oxide enhances the greenhouse effect by capturing reradiated infrared radiation from the Earth’s surface and subsequently warming the troposphere . It is chemically inert in the troposphere and stays in the troposphere for about 120 years before moving into the stratosphere where it ultimately leads to destruction of stratospheric ozone.

Water vapor does absorb longwave radiation and radiates it back to the surface, thus contributing to warming.

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The work done by a person will be  2341.28 J

Work done is negative of change in potential energy, that is  W=−(∆U). It means that Work done against a force (or work done on a system) increases its potential energy. And Work done by a force (or work done by the system) decreases its potential energy

mass = 60.33kg

height = 3.96 m

work done = change in potential energy

                  = m*g*h

                  = 60.33* 9.8 * 3.96 = 2341.28 J

The work done by a person will be  2341.28 J

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