how is this true?.........​

Answer:. True

Explanation:

The risk of becoming infected from contact with an HIV-positive healthcare provider is indeed remote. The Centers for Disease Control and Prevention (CDC) have recommended the use of universal precautions by healthcare providers to minimize the risk of transmitting many infectious diseases, including hepatitis and HIV. The risk of transmission from patient to healthcare provider is far greater than from provider to patient.

"Some people say the risk of hiv transmission from a healthcare provider  is small."

That statement is True.  Because ...

There is NO statement on which public opinion is unanimous.

It can be something as innocuous as "The sky is blue during the day and rain makes the ground wet.", and you will never get 100% of the people to agree on it.  There will still be some people who say it's True and others who say it's False.

And plus ... In this particular case, we're talking about a public health question.  In today's political and cultural environment, marked by anti-science tendencies, a lot of people think that Science is not being truthful with us, it's all a big conspiracy, we are all being misled, and every individual should have the freedum to decide for himself.  So when it comes to talking about something like the risk of HIV transmission, everybody is his own expert.  Some will say the risk of transmission from a healthcare provider is substantial, and the rest will say it's small.

So the long sentence in the question is True.  Some people do indeed say that.  

The displacement of the ball is zero.

What is displacement?

The smallest distance between the initial and final position of an object.

What are the equations of motion?

There are three equations of motion that completely describes the motion of an object.

The first equation of motion gives the relationship between the initial velocity, final velocity, acceleration, and time.

The second equation of motion gives the relationship between the initial velocity, displacement, acceleration, and time.

The third equation of motion gives the relationship between the initial velocity, final velocity, acceleration, and displacement.

Given time, initial velocity, and acceleration, the displacement can be calculated using the second equation of motion. The second equation of motion is,

s=u*t+(1/2)*a*t^2

Here, u=25 m/sec, a=-25 m/sec and t=2.0 sec.

Put the values in the formula and calculate the displacement.

s= (25)*(2.0)+(1/2)*(-25)*(2.0)^2

s=50-50

s=0 m.

Hence the displacement of the ball is zero.

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We use the expression Q = mC(T2-T1). We caclulate as follows:

Q absorbed = Q released

m1 C (T-T1) = -m2 C (T-T1)

C can be cancelled since they are the same substance.

m1 (T-T1) = -m2 (T-T1)

25 (T-10) = -12 (T-30)

T = 16.49 degrees Celsius

The final temperature of the two liquids is 16.49 degrees Celsius.

The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.

We use the expression Q = mC(T2-T1). We caclulate as follows:

Q absorbed = Q released

m1 C (T-T1) = -m2 C (T-T1)

C can be cancelled since they are the same substance.

m1 (T-T1) = -m2 (T-T1)

25 (T-10) = -12 (T-30)

T = 16.49 degrees Celsius

The final temperature of the two liquids is 16.49 degrees Celsius.

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C. A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.

In order to operate, a heat engine must reject some of the heat it receives from the high-temperature source to a low-temperature sink.

A heat engine that violates the second law converts 100 percent of this heat to work. This is physically impossible. This heat engine violates the second law of thermodynamics.

The second law can also be stated as no heat engine can have a thermal efficiency of 100 percent.

The thermal efficiency of a heat engine is defined as the ratio of the work output to the heat input:

Clearly, if the thermal efficiency of a heat engine is 100 percent,

Qin=Wout

If the second law precludes a heat engine from having a thermal efficiency of 100 percent. A heat engine is a device that converts a portion of the heat supplied to it from a high-temperature source into work. The remaining heat is rejected to a low-temperature sink.

Therefore:

A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.

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Answer:8 meters

Explanation:100cm is a meter

Answer:

8 meters

Explanation:

800 cm * 0.01 m/1 cm = 8.0 m

The conversion steps listed above in order from start to finish are already in an arranged form from 1-4.

A biosphere can be defined as the part of the earth that supports life. These include :

The flow of energy through the biosphere includes

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The speed of the skier on reaching the bottom of the slope is 25.43 m/s.

Kinetic energy on reach the bottom = P.E - 10 kJ

Kinetic energy on reach the bottom = (60)(9.8)(50) - 10 kJ

Kinetic energy on reach the bottom = 19.4 kJ = 19,400 J

K.E  = ¹/₂mv²

2K.E = mv²

v² = 2K.E/m

v² = (2 x 19,400)/(60)

v² = 646.667

v = √646.667

v = 25.43 m/s.

Thus, the speed of the skier on reaching the bottom of the slope is 25.43 m/s.

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An Astronomer who made a list of 100 nebulae and galaxies that could

be mistaken for comets was Charles Messer's.

Charles Messier's was a very famous scientist in the field of Astronomy.

His research in appearance of Great comet filled spark to his passion

 of Astronomy. On January 21, 1759 he put his thought of wrong

 calculation of Delisle's and he described a faint glow resembling comet

 had been seen earlier. Then after, he discovered great comet near

 sword of Orion.

  There are various tales of Charles Messiers which put him forward

  towards his love of Astronomy.

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Answer:

the best answer would be c

Explanation:

total distance travel by the red spot is 4 times of Amplitude

Given:

A transverse wave on a string has an amplitude "A". A tiny spot on the string is colored red.

To find:

Distance travelled by red spot in one cycle of the wave.

Solution:

So, we know that particles in a transverse wave oscillate periodically in a direction perpendicular to propagation of wave.

Frankly speaking, the type of motion shown by particles is SHM (simple harmonic motion)

So, in a wave cycle, the red dot will start from a particular position and will end at the same position.

Let's assume that the red coloured part started from mean point. So, it will go to one extremity return back to the other extremity and finally end at the mean position.

So, it traverses a distance 4 times of the Amplitude.

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The energy that is stored in the spring is 0.018 J.

Hooke's law states that as long as the elastic limit is not exceeded, the extension is directly proportional to the load.

Now we have the following;

The compression =  20 mm or 0.02 m

The spring constant = 90kN/m

Energy stored in the spring = 1/2Ke^2

= 1/2 *  90kN/m * (0.02 m)

= 0.018 J

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The length of the wire is 36 m.

The density is the ratio of the mass and volume of a substance. The density  is given by the formula,

d=m/V

where d is the density. m is the mass and V is the volume.

The density of the material does not change and the initial and final volume of the substance will be equal when it has changed shape provided the mass has not been changed.

The radius r of the sphere is half of its diameter. Therefore, r=6.0/2 = 3.0 cm.

Then volume of the sphere Vs is given by the formula,

Vs=(4/3)*π*r^3

Put the value of r in the above formula.

Vs=(4/3)*3.14*(3.0)^3

Vs=113.04 cm^3

For the cylinder, the radius s=0.2/2 mm = 0.01 cm and the length l is unknown. The volume of the cylinder Vc is given by the formula,

Vc=πs^2l

Put s=0.01 cm in this equation and solve it.

Vc=(3.14)*(0.01)^2l

Vc=0.000314 l cm^2

The volume of the wire (cylindrical in shape) and the sphere are same, therefore,

Vc=Vs

0.000314 l =113.04

l=3600 cm

I=36 m.

Hence the length of the wire is 36 m.

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Answer:

86.4 m  horizontal from landing spot

Explanation:

Find out how long before the ball hits the ground

 vertical speed  of ball = -2  m/s     gravity = - 9.81 m/s^2

find time to hit ground from 100 m  

          ( height will be zero when it hits the ground)

0 =  100  - 2 t  - 1/2 ( 9.81) t^2

        use Quadratic Formula to find t = 4.32 seconds

              horizontal speed of ball = 20 m/s  

in 4.32 seconds it will travel horizontally   20  m/s * 4.32 s = 86.4 m

Answer:

B. Nuclear Energy

A more fundamental way to measure the rotation of Jupiter is to measure the changes in the planet's radio waves, which are controlled by its magnetic field.

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Arette is considered bilingual.

Within the context of this question, Arette is from France but speaks two different language

Bilingual is a word which is usually, frequently and most of the times used to describes a person, community or a nation that speaks two languages.

I myself too; I am bilingual; I speak English and Yoruba

Generally, people who speak more more more than one language are considered as linguists

In conclusion, Arette is considered bilingual.

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Answer:

Mercury: Mercury is hot, but not too hot for ice. It has a thin atmosphere, and it doesn't have any moons.

Venus: Venus has a thick, toxic atmosphere filled with carbon dioxide and it's perpetually shrouded in thick, yellowish clouds of sulfuric acid that trap heat, causing a runaway greenhouse effect. That is why it is very hot on Venus.

Mars: Mars is similar to Earth. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons, and weather. It has an atmosphere, but it is very, very thin.

Jupiter: Because of its great mass, Jupiter is a great comet catcher. Jupiter is covered in swirling cloud stripes and has many storms. An example is the great red spot.

Saturn: No one knows how old Saturn's rings are. It remains a mystery. A cool fact about Saturn could float in water because it is mostly made of gas.

Uranus: Uranus is more stormy than we thought. Uranus is the coldest planet in the Solar System.

Neptune: Neptune has supersonic winds. These winds of are on average over 700 mph.

0.118 m is the distance between the two protons.

Mass of proton = 1.6726 × 10⁻²⁷ kg

Weight of proton= 1.6726 × 10⁻²⁷ x 9.81 N

                            = 1.6408 × 10⁻²⁶ N

Charge of proton = 1.602 × 10⁻²⁹ C

The force between two protons = kq²/r²     where, K is a proportionality    

                                                            constant, q is a charge of proton and  

                                                         r is the distance between two protons.          

                                                       = 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²      

To calculate distance :

  Weight of proton= Force between protons

 ⇒   1.6408 × 10⁻²⁶ N = 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²

 ⇒    r = 0.118m

Therefore, 0.118 m is the distance between the two protons.

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Answer:

the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living

Explanation:

Yes that can be understood by a simple example

Suppose two people are in exam

[tex]\large\longrightarrow [/tex] Intelligence is the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living.

Answer:

37.5 Seconds

Explanation:
Speed = frequency * Wavelength

We can find the Frequency by the information given, Frequency = waves per second .

40 Waves per second, = 40 Hz

Wavelength = 8cm
Cm = M
8cm/100 = 0.08m

Speed = 40 Hz * 0.08m
Speed = 3.2m/s

Speed = Distance / time taken
Time = Distance / Speed

Time = 120 / 3.2

Time = 37.5 seconds

The team of engineers must first define the problem, Option A.

The term air quality has to do with the overall purity of the air in a certain locality. We know that the air in an area is affected by the activities of the people that reside in that vicinity.

In this case, the team of engineers must first define the problem before they can  improve local air quality in the community.

Missing parts;

A team of engineers is asked to help a community improve local air quality. What must the team do before it can begin to identify possible solutions?

answer choices

Iterate to improve the solution.

Define the problem.

Select one solution.

Model the solution.

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The magnitude of the net electric field at the origin due to the given distribution of charge is E_net = 4kQ/πR².

Given:

A semi-circle distribution with radius 'r'

Charges '+Q' and '-Q'

Calculation of net electric field:

Step 1:

The electric field for a charge is given as:

E = (kλ/R) i + (kλ/R) j         - ( 1 )

where, k is Coulomb's force constant

            λ is charge density

            R is separation distance between the charges

            i & j are unit vectors for x-axis and y-axis respectively

Step 2:

The electric field due to charge +Q is given as:

E₁ = (kλ/R) i - (kλ/R) j      - ( 2 )  

The electric field due to charge -Q is given as:

E₂ = (kλ/R) i + (kλ/R) j     - ( 3 )

Step 3:

Thus, the net electric field will be given as:

E_net = E₁ + E₂

Applying values in above equation, we get:

E_net = (kλ/R) i -(kλ/R) j + (kλ/R) i + (kλ/R) j

          =( kλ/R) [ i - j + i + j ]

          = 2i (kλ/R)                                     -( 4 )

Step 4:

Now, we know that the linear charge density is given as:

λ = Charge/length

   = Q/(πR/2)

   = 2Q/πR

Applying the value in equation 4, we get:

E_net = 2i (k(2Q/πR)/R)

          = 4i (kQ/πR²)

          = 4kQ/πR²

Therefore, the net electric field due to the given charge distribution is of magnitude 4kQ/πR² directed along the positive x-axis.

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Using the scale model of the Sun given;

The diameter of the Milky Way is about 1 × 10¹⁸ km.

The diameter of the Sun is about 1.4 × 10⁶ km

The diameter of the Earth is about 1.27 × 10⁴ km.

Using the scale model of the Sun given, the diameter of the Milky Way = (1 × 10¹⁸ km/1.4 × 10⁶ km) × 0.6 m

The diameter of the Milky Way = 4.28 × 10¹¹ m

Using the scale model of the Sun given, the diameter of the Milky Way = (1.27 × 10⁴ km/1.4 × 10⁶ km) × 0.6 m

The diameter of the Earth = 5.44 × 10⁻³ m

In conclusion, the diameter of the Milky Way is far bigger than the Sun while the diameter of the Sun is about 5400 times bigger than the Earth.

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The acceleration of the mass when it is nudged ever so slightly on the incline: a = (g sin(∅)) - (μ g cos(∅))

If the minimum mass on the incline is nudged ever so slightly, it will experience a force due to gravity pulling it down the incline. This force can be broken down into two components: one parallel to the incline and one perpendicular to the incline.

Since the mass is on an incline, it experiences a normal force that is perpendicular to the incline.

The perpendicular component, also known as the weight component perpendicular to the incline, is given by mg cos(∅).

The force of friction can be represented as the product of the coefficient of friction (μ) and the normal force (mg cos(∅)).

Therefore, the net force along the incline is;

(mg sin(∅)) - (μ mg cos(∅)).

To calculate the acceleration, we use Newton's second law, which states that the net force acting on an object is equal to its mass (m) multiplied by its acceleration (a).

(mg sin(∅)) - (μ mg cos(∅)) = ma

Simplifying:

a = (g sin(∅)) - (μ g cos(∅))

This is the expression for the acceleration of the mass when it is nudged ever so slightly on the incline. The acceleration will depend on the angle of the incline (theta), the coefficient of friction (μ), and the acceleration due to gravity (g).

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J.J. Thomson discovered the electron by noticing that a beam of particles could be influenced by an electric or magnetic force.. That is option B.

An electron can be defined as the part of an atom that is negatively charged and is found revolving round the nucleus of an atom.

J.J. Thomson was the scientist that discovered electrons through subjecting two oppositely-charged electric plates around the cathode ray.

He noticed that the particles where deflected by both the magnetic and electric fields.

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The maximum height attained by the ball is 60 m.

We know that the maximum height can be obtained from the equation;

v^2 = u^2 - 2gh

v =  final velocity

u = initial velocity

g = acceleration due to gravity

h = maximum height

Since the final velocity is 0 m/s at maximum height then;

u^2 = 2gh

h = u^2/2g

h = (34.3)^2/2 * 9.8

h = 60 m

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Answer:

The weeping willow is a gentle, graceful tree, but willow tree roots are very shallow and invasive. This means it's not the best backyard tree option for many

Explanation:

The temporarily be the output of a 100-W light bulb is 148 watt.

To find the answer, we need to know about the resistance of the bulb.

Resistance= 115²/100= 132.25 Ohm

Power= voltage²/resistance

= 140²/132.25

= 148watt

Thus, we can conclude that the temporary output of the bulb is 148 watt.

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Solids have a distinct volume and form. Although they have a specific capacity, liquids adopt the form of a container. Gases lack a distinct volume or form.

Gas is a sample of matter that adopts the shape of the container in which it is housed and develops a uniform density inside the container.

a)Particle motion

Liquid molecules are more energetic than solid molecules. Further heating will cause the molecules to move so quickly that they won't stick together at all. The gas molecules have the highest energy content.

b)Shapes

Solids are discrete in their shape and volume. Although they take on the shape of the container, liquids have a specific volume. The form and volume of gases are ambiguous.

c)Compressibility

The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.

The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis.

Hence solids, liquids, and gases differentiate in terms of particle motion, shape, and compressibility.

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Answer:

In a solid, atoms vibrate or wiggle, but are locked in place. Solids have a rigid shape, and are hard to compress. In a liquid, atoms have some freedom to move. Liquids take the shape of their container, and are hard to compress. In a gas, atoms move freely. Gases have no definite shape, and are easy to compress.

Explanation:

The particle temperature and the valency of the atom in the particles are the two parameters that decrease with the kinetic energy of the particles in an item.

Temperature directs to the hotness or coldness of a body. In clear terms, it is the method of finding the kinetic energy of particles within an entity. Faster the motion of particles more the temperature.

Because an item possesses kinetic energy when it is moving, anything that prevents that motion will reduce the kinetic energy of the object.

A valence electron is an electron in the outermost shell associated with an atom that can experience the innovation of a chemical bond if the outer shell is not closed. Both atoms contribute one valence electron to create a shared pair.

More the valence electron more the motion of atoms results in more kinetic energy,

Hence the two factors decrease as the kinetic energy of the particles in an object will be the particle temperature and the valency of the atom in the particles.

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