Type O negative blood is considered the universal red blood cell donor because it _____.
A.
Has all 3 types of antigens.
B.
Has all 3 types of antibodies.
C.
Lacks all 3 types of antigens.
D.
Lacks all 3 types of antibodies.

Answer:

Alkali Metals

Explanation:

Most commonly, the color represents what type of element it is (noble gas, alkali metal). This is not always true as different tables follow different coloring schemes

Colored tables are important because they give you an extra dimension of information. A typical periodic table is colored according to element groups, which are elements that share chemical and physical properties. Some element groups are easily identified as columns on the periodic table, but as you move across the table, the trends aren't so clear-cut. The metalloids and nonmetals, for example, don't fall neatly into the same column. Color coding helps identify similar elements such as these at a glance.

Final answer:

The orange region on a color-coded periodic table usually represents the f block, including lanthanides and actinides.

Explanation:

In the context of various color-coded periodic tables, the orange region typically represents the f block elements. An example can be found in an empty periodic table, separated into different colored blocks, where the s block is blue, the d block is green, the p block is red, and the f block is orange.

The f block includes lanthanides and actinides, which are typically shown at the bottom of the Periodic Table. These elements are known for their complex electronic configurations and are also referred to as inner transition metals.

The work done is 6958 J

Explanation:

The work done by the man to raise the weight is the equal to the increase in gravitational potential energy of the weight, so we can write:

[tex]W=mg \Delta h[/tex]

where

(mg) is the weight, with m being the mass and g the acceleration of gravity

[tex]\Delta h[/tex] is the change in height of the weight

In this problem, we have

mg = 710 N (weight)

[tex]\Delta h = 0.65 m[/tex]

Therefore, the work done is

[tex]W=(710)(9.8)=6,958 J[/tex]

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The work done is 461.5 J.

Explanation:

According to Kinetics, the work done is calculated as the product of force which has done work, and the displacement it has imposed. Hence,

                     [tex]\text {Work done}=F \times s[/tex]

In the problem, the given data, F = 710 N and s = 0.65 m

By applying the given values to the work done equation, we get as follows,

                     [tex]\text { Work done } = 710 \times 0.65 = 461.5 \mathrm{J}[/tex]

The unit is same as the energy, work done defines when 1 N force acts in a 1 m distance along the force’s direction.

The mechanical advantage of the pulley is 3.56

Explanation:

The Mechanical Advantage (MA) of a pulley system is given by

[tex]MA=\frac{Load}{Effort}[/tex]

where

Load is the weight of the object lifted

Effort is the force applied in input

For the pulley in this problem, we have:

Effort = 55 N

While the load is the weight of the box of mass m = 20.0 kg:

[tex]Load = mg = (20.0 kg)(9.8 m/s^2)=196 N[/tex]

Substittuing, we find the MA of the pulley:

[tex]MA=\frac{196}{55}=3.56[/tex]

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Answer:

Radiation is the answer to your question

Answer:

endothermic reactions

Answer:

endothermic reactions

Explanation:

endothermic reactions means the reaction gets super hot while the surrounding area gets colder. (absorbs energy)

exothermic means the surrounding area gets hot while it gets colder. (releases energy)

Answer:

I believe that the answer is D. There are drilling platforms all along the coast that are used to drill for natural gas that can be used to generate electricity.

Explanation:

Solar panels use the sun, and that is renewable.

The power plant uses tides and waves, they are renewable.

Windmills use wind, that is renewable.

So, the answer is D.

Answer:

D. There are drilling platforms all along the coast that are used to drill for natural gas that can be used to generate electricity.

Answer:

30 kg

Explanation:

Newton's second law:

F = ma

60 N = m (2 m/s²)

m = 30 kg

Answer:

[tex]30\:g[/tex]

Explanation:

Isaac Newton's second law of motion

[tex]\displaystyle ma = F_{net}[/tex]

[tex]\displaystyle \frac{60}{2} = m \\ \\ 30 = m[/tex]

* Now, that bar above 18 is what is known as bar notation, indicating repetition in the digits.

I am joyous to assist you anytime.

The mass of the ball is 6.67 kg

Explanation:

The momentum of an object is given by:

[tex]p=mv[/tex]

where

p is the momentum

m is the mass of the object

v is its velocity

It must be noted that momentum is a vector quantity, so it has both magnitude and direction (but here only the magnitude is given).

For the ball in this problem, we have:

v = 1.5 m/s is its velocity

p = 10.0 kg m/s is its momentum

Solving the formula for m, we find the mass of the ball:

[tex]m=\frac{p}{v}=\frac{10}{1.5}=6.67 kg[/tex]

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Answer:option A is correct.

Explanation:Because in option C :magnetic field is constant.

Option D:Because in option D,electric field is constant.

Because constant electric and magnetic fields cannot produce electric current.

Option B:A changing electric field cannot produce magnetic field.

Option A:Because a changing magnetic field can produce electric current.

A rotating coil in a magnetic field generates electricity by electromagnetic induction, where a changing magnetic field within the coil induces an electric current.

A rotating coil inside a magnetic field generates electricity through a process known as electromagnetic induction. This principle is based on Faraday's Law of Electromagnetic Induction that states a changing magnetic field within a conductive loop induces an electromotive force. As the coil rotates, it cuts across magnetic field lines, inducing a voltage change. The variation in the magnetic field induces an electric current in the coil. This process is the basic working principle behind many electrical generators and motors.

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Yes, but it's a null vector .So,no vector can have a component at right angle to itself unless it is a zero vector.

The magnitude of a vector component at a right angle to the vector is zero, and the condition for the resultant of two vectors of equal magnitude to equal the magnitude of either one is when the angle between them is 0 or 180 degrees.

The magnitude of the component of a vector at a right angle to itself is always zero because a vector cannot have a component in the direction that is perpendicular to its direction of action. When we calculate the magnitude A and direction of a vector from its perpendicular components Ax and Ay, relative to the x-axis, we use trigonometric relationships, where Ax = A×cos(θ) and Ay = A×sin(θ).

Now, under the specific condition when two vectors are at right angles to each other, the magnitudes of their sum and difference are the same. This happens because the vectors are orthogonal, and their components in the direction of each other are zero. We also know that when the components are equal and vectors are added with an angle of 90 degrees between them, the magnitude of the resultant equals the magnitude of either vector multiplied by the square root of two. This is due to Pythagoras' theorem applied in the context of vector addition.

The sample answer from Edge 2020 is Fossil fuels are burned to heat water and create steam. Moving steam turns turbines, which generate electricity.

(For those who don't want to paraphrase the other answer)

(Their answer is also copied word for word from lenntech . com which is against community guidelines)

Answer:

i will give you the sample answer and the answer i put..

sample answer: Fossil fuels are burned to heat water and create steam. Moving steam turns turbines, which generate electricity.

my answer: by burning fossil fuels the energy of the fossil fuels will be converted to mechanical energy by turbines. then electric generators will change this energy to electricity

Explanation:

True: when there is an angle between force and displacement, [tex]W=Fd cos \theta[/tex]

Explanation:

The work done by a force when pushing/pulling an object is given by the equation

[tex]W=Fd cos \theta[/tex]

where

F is the magnitude of the force

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and of the displacement

We have two extreme cases:

- When the force is parallel to the displacement, then [tex]\theta=0^{\circ}[/tex] and [tex]cos \theta = 1[/tex], so the work done is maximum and simply becomes

[tex]W=Fd[/tex]

- When the force is perpendicular to the displacement, then [tex]\theta=90^{\circ}[/tex] and [tex]cos \theta =0[/tex], so the work done is zero.

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Answer:

The acceleration of the car is [tex]1.432 m/s^{2}[/tex]

Explanation:

We are assuming rightward coordinate positive and all quantities are along this direction

We know,

[tex]a = \frac{dv}{dt}[/tex]

where a - acceleration, v=velocity, t=time and x=displacement

multiply by dx in both sides

[tex]adx = \frac{dv}{dt} dx[/tex]

but we know [tex]\frac{dx}{dt} = v[/tex]

Therefore,

[tex]adx = vdv[/tex]

Here we integrate both sides with proper limits

x ranges from 0 to 110 as v ranges from 29 to 34

p = 0, r = 110, q = 29, s = 34

[tex]a\int\limits^r_pdx = \int\limits^s_q {v} \, dv[/tex]

a is given as constant thus can be pulled out of the integration

[tex]a[110-0] = [\frac{34^{2}}{2}- \frac{29^{2}}{2}][/tex]

Therefore,

Accelaration of the car is [tex]1.432 m/s^{2}[/tex]

Note:

Here moving to the right doesn't mean anything significant other than the fact that all quantities are pointing in that direction. Therefore obtained acceleration is also towards the right

If you know equation of motion for constant acceleration as

[tex]v^{2} -u^{2} = 2as[/tex] you can plug in values in this equation to obtain value of a

v - final velocity

u - initial velocity

s - displacement

Answer:

The gauge pressure is = 91.52 lb/in²

Explanation:

Given data,

The value of pressure in S.I unit, = 6.31 x 10⁵ N/m²

The conversion formula for SI unit into US Customary Units is given by,

                             1 N/m² = 1.45 x 10⁻⁴ lb/in²

Using the conversion formula, the new value of pressure becomes,

                        Pressure = 6.31 x 10⁵ X 1.45 x 10⁻⁴ lb/in²

                                         = 91.52 lb/in²

Hence, the gauge pressure is, ς = 91.52 lb/in²

To convert the absolute pressure of 6.31 × 10^5 N/m² to gauge pressure in lb/in², subtract the atmospheric pressure from the absolute pressure and then convert the gauge pressure from N/m² to lb/in² using the conversion factor. Therefore, the gauge pressure is approximately 76.8 lb/in.².

To convert the absolute pressure of 6.31 × 10^5 N/m² to gauge pressure in lb/in², we can use the conversion factor of 1 lb/in.² = 6.90 × 10³ N/m². First, we'll calculate the gauge pressure in N/m² by subtracting the atmospheric pressure (which is 1 atm) from the absolute pressure:

Next, we'll convert the gauge pressure from N/m² to lb/in²:

Therefore, the gauge pressure is approximately 76.8 lb/in.²

Answer: Acted on by equal forces in opposite direction

Explanation:

Newton's First Law says that every body continue in its state of rest or constant speed on a straight line unless being acted upon by an external force.

Answer:

Acted on by equal forces in opposite direction

Explanation:

The final velocity is 2.7 m/s

Explanation:

We can solve this problem by using the principle of conservation of momentum: in fact, in absence of external forces, the total momentum of the system must be conserved before and after the collision.

Therefore we can write:

[tex]p_i = p_f\\m_1 u_1 + m_2 u_2 = (m_1+m_2)v[/tex]  

where:  

[tex]m_1 = 3 kg[/tex] is the mass of the putty

[tex]u_1 = 10 m/s[/tex] is the initial velocity of the putty (we take its direction as positive direction)

[tex]m_2 = 8 kg[/tex] is the mass of the ball

[tex]u_2 = 0 m/s[/tex] is the initial velocity of the ball (at rest)

[tex]v[/tex] is the final combined velocity of the two putty+ball

Re-arranging the equation and substituting the values, we find the  final combined velocity:

[tex]v=\frac{m_1 u_1 + m_2 u_2}{m_1+m_2}=\frac{(3)(10)+0}{3+8}=2.7 m/s[/tex]

And the positive sign indicates their final direction is the same as the initial direction of the putty.

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Answer:

No you would not be an entrepreneur

Explanation:

An entrepreneur is someone who creates a business, and also organize the business affairs. The entrepreneur takes on the biggest financial risk.

Answer:

No, taking a job with Amazon does not make one an entrepreneur

Explanation:

An entrepreneur is an individual that sets up a business or businesses (with the aim of making profit). In any organization, the person or persons that start up the business or businesses are the entrepreneurs while the people employed are the employee of the business/businesses.

Entrepreneurs usually create jobs for the employee and not the other way round (even when the idea could come from the employee).

From the above, it can be deduced that a person who gets a job at Amazon is an employee while the owner of Amazon is the entrepreneur.

Answer:

Tendon connects our muscles to our bones.

Explanation:

A tendon (or sinew) is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension.

Tendons are similar to ligaments and fasciae; all three are made of collagen.

Ligaments join one bone to another bone; fasciae connect muscles to other muscles.

Tendons and muscles work together to move bones.

The tendon is the part of the muscle that connects directly to the bone.

Answer:

As we keep on increasing the radius the value of the gravitation force of attraction decreases and as we decrease the radius the gravitation force increases.

Explanation:

Like the coulombs law of electrostatics, the law of gravitation also depends inversely on the square of the value of r. Therefore, as we keep on increasing the value of r the value of the gravitation force decreases and as we decrease the value of the r the value of gravitation force increases.

Gravitation Force=[tex]\frac{Gm_{1}m_{2} }{r^{2}}[/tex]

Coulombs's Law= [tex]\frac{Kq_{1}q_{2} }{r^{2}}[/tex]

Answer:

The answer is C

Explanation:

I did it on usatestprep and got it right

Answer:

Disadvantages of geothermal energy:

1. Potential emissions

The greenhouse gas below the surface tends to move up to the surface and this emission of gas contains sulfur dioxide and silica which also have considerable amount of toxic heavy metals such as mercury, boron and arsenic.

2. Surface instability

Construction of a geothermal power plant is quite difficult. It affects the stability of the land. In 1997, while constructing a geothermal power plant in Switzerland causes an earthquake of magnitude 3.4.

3. Location specific

Good geothermal reservoirs are not found at every place and the prime locations for the power plant are far from the population centers.

Answer:

13 to 19 years old

Explanation:

Because these 6 years there is the word TEEN 13, 14, 15, 16, 17, 18, and 19. but in 20 there is no teen.

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The centripetal force is the radial force responsible for keeping an object in circular motion; its equation is [tex]F=m\frac{v^2}{r}[/tex]

Explanation:

Whenever an object is in circular motion, there must be a force that makes the object turning away from its "normal" straight trajectory, keeping it along the circular path.

This force always points towards the centre of the circle, and it is called centripetal force.

The equation to calculate the centripetal force for an object in uniform circular motion is:

[tex]F=m\frac{v^2}{r}[/tex]

where

m is the mass of the object

v is its linear speed

r is the radius of the circle

The nature of the centripetal force is always different and depends on the context. For instance:

- For a stone attached to the end of a rope put in horizontal circular motion, the centripetal force is provided by the tension in the string, which pulls constantly the stone towards the centre of the circle

- For a satellite in circular orbit around the Earth, the gravitational attraction between the Earth and the satellite provides the centripetal force

- For a car moving along a circular turn on an unbanked track, the force of frction between the tires of the car and the road provides the centripetal force.

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Centripetal forces are not made by anyone but rather are a type of force that acts on objects moving in a circular path, directed towards the center of the curvature. The equation for centripetal force ({F_c}) is  {F_c = m  imes v^2 / r}, where  {m} is the mass of the object,  {v} is the velocity at which the object is traveling, and  {r} is the radius of the circular path.

As per physics principles, centripetal force is the force that keeps an object moving in a circular path, always pointing towards the center of the path. It can be provided by various types of familiar forces, such as tension or gravitational force. Newton's third law explains that forces come in action-reaction pairs. When an object is moving in a circle, such as a stone whirled at the end of a string, the tension in the string is the centripetal force, and the stone's inertia that seems to pull away from the center is interpreted as centrifugal force. This feeling of being 'thrown' away from the center, such as when a car turns, is due to the body's inertia and not an actual force exerted outward. The centripetal force is essential in circular motion scenarios and can be described mathematically with Newton's second law applied to objects traveling along circular paths.

Answer:

Accuracy refers to how close measurements are to the "true" value, while precision refers to how close measurements are to each other

The given statement "  Accuracy and precision mean the same thing" is false because accuracy and precision are two distinct concepts used to describe the quality of measurements.

1. Accuracy: Refers to how close a measured value is to the true or accepted value. In other words, it measures the correctness of a measurement. A measurement is considered accurate if it is close to the true value.

2. Precision: Refers to the consistency or reproducibility of measurements. It describes how close multiple measurements of the same quantity are to each other. Precision does not necessarily imply accuracy; measurements can be precise but not accurate if they are consistently off-target.

In summary, accuracy relates to correctness, while precision relates to consistency. A measurement can be accurate, precise, both, or neither. Therefore, accuracy and precision do not mean the same thing, and it is essential to distinguish between the two when evaluating the reliability of measurements.

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The current through a 25 ohm resistor connected to a 5.0 V power supply is 0.2 A. Option A is correct.

Ohm's Law:

The voltage of the two points between in a conductor is directly proportional to the current flows through the conductor.

V = IR

Where,

V = voltage  = 5.0 V

I = current  = ?

R = resistance -  25  ohm

Put the values in the equation,

5 = 25 x I

I = 0.2 A

Therefore,  the current through a 25 ohm resistor connected to a 5.0 V power supply is 0.2 A.

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The mass of water is 0.139 kg

Explanation:

The density of a substance is given by the equation

[tex]\rho = \frac{m}{V}[/tex]

where

[tex]\rho[/tex] is the density

m is the mass of the substance

V is its volume

In this problem we have:

V = 139 mL is the volume of water

The density of water is:

[tex]\rho = 1 g/mL[/tex]

Solving the equation for m, we find its mass:

[tex]m=\rho V = (1.0)(139)=139 g[/tex]

And converting into kilograms,

[tex]m=139 g = 0.139 kg[/tex]

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Answer:

Answer: •Currents occur at the surface of and deep within the ocean.

             •The Coriolis effect contributes to the direction of current flow.

             •Wind direction, the spin of Earth, and differences in temperature  

Explanation:

Answer:

It stores electrical energy for later

Explanation:

Answer:

The generator transforms the mechanical energy of the turbine into electrical energy.

Explanation:

The wavelength is 91.5 pm ( 91.5 Pico meter).

Explanation:

The formula can be expressed below for electron’s energy,

            [tex]\text {Energy of electron}=\frac{p^{2}}{2 m}[/tex]

Where,

p = momentum

m= mass of electron

We know, mass of electron =  [tex]9.1 \times 10^{-31} \mathrm{kg}[/tex]

Energy of electron, [tex]1 e V=1.6 \times 10^{-19} \mathrm{J}[/tex]

Therefore, [tex]\text { energy of electron, 180 eV }=180 \times 1.6 \times 10^{-19} J[/tex]

By substituting the known values in the equation, we get,

          [tex]180 \times 1.6 \times 10^{-19}=\frac{p^{2}}{2 \times 9.1 \times 10^{-31}}[/tex]

          [tex]p^{2}=180 \times 1.6 \times 10^{-19} \times 2 \times 9.1 \times 10^{-31}[/tex]

          [tex]p^{2}=5241.6 \times 10^{-50}[/tex]

Taking square root, we get

          [tex]\text {Momentum, } p=72.399 \times 10^{-25} \mathrm{kg} . \mathrm{m} / \mathrm{s}[/tex]

We know,

               [tex]\lambda=\frac{h}{p}[/tex]

Here, h – Planck constant = [tex]6.626 \times 10^{-34} \mathrm{J.s}[/tex]

So, the wavelength would be,

              [tex]\lambda=\frac{6.626 \times 10^{-34}}{72.399 \times 10^{-25}}=0.0915 \times 10^{-34+25}=0.0915 \times 10^{-9} \mathrm{m}[/tex]

Adding [tex]10^{-3}[/tex]  in both numerator and denominator we get the value as

              [tex]\lambda=0.0915 \times 10^{-9} \times \frac{10^{-3}}{10^{-3}}=0.0915 \times 10^{3} \times 10^{-12}=91.5 \mathrm{pm}[/tex]

Where, pm – Pico meter - [tex]10^{-12}[/tex]

Explanation:

The cross section per unit length is uniform, so ρ is constant.

The center of mass is therefore:

x_avg = (∫₀ᴸ x ρ dL) / (∫₀ᴸ ρ dL)

x_avg = (∫₀ᴸ x dL) / (∫₀ᴸ dL)

x_avg = (½ L²) / (L)

x_avg = ½ L

Answer: Work done is 18J

Explanation:

Force F = (Fx, Fy) and Displacement S = (Sx,Sy)

Fx=7N

Fy=-1N

Sx=3m

Sy=3m

F=(7,-1)N and S=(3,3)m

Work done is calculated by taking dot product of force and displacement vector

W=F·S

W=7×3 + (-1)×3

W=21+(-3)=18J

Answer:

18 and 35 degrees

Explanation: