How do radiography and sonography compare?

a.Each technique increases the risk of developing cancer.
b.Radiography uses X-rays, but sonography uses radio waves.
c.Each technique uses mechanical waves.
d.Radiography uses ionizing radiation, but sonography does not.

Efficiency or [tex]\eta[/tex] is calculated by formula: [tex]\eta=\frac{W_{output}}{W_{input}}[/tex] where [tex]\eta\leq1[/tex] also efficiency has no unit.

Now put in the data and calculate the efficiency.

[tex]\eta=\frac{8}{10}=\boxed{0.8}[/tex]

The efficiency of the machine is 0.8

If you want to get percentage just multiply by 100 and you get 80%

Hope this helps.

r3t40

An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air.

Answer:

7.0 s, 69 m/s

Explanation:

If we take down to be positive, then the time to reach the ground is:

x = x₀ + v₀ t + ½ at²

240 m = (0 m) + (0 m/s) t + ½ (9.8 m/s²) t²

t = 7.0 seconds

The final velocity is:

v² = v₀² + 2a(x - x₀)

v² = (0 m/s)² + 2(9.8 m/s²) (240 m - 0 m)

v = 69 m/s

The components that are found outside the nucleus is electrons

Answer: Electrons

Explanation:

Electrons are the negatively charged particles found outside an atom. Protons are positively charged (you can remember P for positive!) and neutrons have no charge or a neutral charge. Remember N for no charge or Neutral.

many increases and decreases but declined overall

Answer:

According to the graph, the population size of gray fox in the United States from 1990 to 2011 had many increases and decreases but declined overall.

Explanation:

The gray fox is a species of carnivorous mammal of the Canidae family distributed by the American continent, from the south of Canada to Venezuela.

Gray foxes are occasional hunting targets, mainly for the use of their fur, but also for illicit pet trade purposes. Although gray foxes are hunted, it is not as common as in other types of foxes, since the degree of their coats is perceived as inferior in quality. Several thousand gray foxes are caught for fur acquisition each year, notes the Minnesota Department of Natural Resources.

Answer:

444 Hz

Explanation:

When two notes of slightly different frequency interfere with each other, they form a resultant wave whose frequency is called beat frequency, which is given by the difference between the frequencies of the two notes:

[tex]f_B = |f_1 - f_2|[/tex]

In this case, we have

[tex]f_1 = 440 Hz[/tex] is the frequency of the tuner

[tex]f_2[/tex] is the frequency of the string

[tex]f_B = 4 Hz[/tex] is the beat frequency (4 beats per second)

We also know that the frequency of the string is too high compared to the tuner, so

[tex]f_2 > f_1[/tex]

so we can find the frequency of the string:

[tex]f_2 = f_1 + f_B = 440 Hz + 4 Hz = 444 Hz[/tex]

It give s you acceleration as slope of v-t graph gives acceleration

The slope of speed time linear graph is acceleration of an object.

Explanation:

By formula, the product of mass and acceleration of a body gives us the force of acting on it. In other terms, acceleration of a body can be defined as the ratio of change in velocity and change in time.

In a graph with speed or velocity on X axis and time on Y axis, the slope of the curve gives us acceleration as output.

Answer:

Graph

Explanation:

I already answered this question

Answer: graph

Explanation:

Answer:

[tex]9.6\cdot 10^{-15} N[/tex]

Explanation:

The magnetic force acting on a charged particle moving perpendicularly to the field is given by:

[tex]F=qvB[/tex]

where

q is the charge

v is the speed of the particle

B is the magnetic field strength

In this problem, we have:

[tex]q=-1.6\cdot 10^{-19} C[/tex] is the charge

[tex]v=3.0\cdot 10^6 m/s[/tex] is the speed

[tex]B=0.020 T[/tex]

so, the magnetic force is

[tex]F=(-1.6\cdot 10^{-19} C)(3.0\cdot 10^6 m/s)(0.020 T)=9.6\cdot 10^{-15} N[/tex]

Answer:

For plato users: Option C.

Explanation:

Answer:

C

Explanation:

cause im smart

Answer: C

Explanation:

Not only am I smart but I want to help people.

Answer:

Its B trust me

Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2  Aaron made an error in his chart.

Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2  Aaron made an error in his chart.

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Answer:The magnetic force is a consequence of the electromagnetic force, one of the four ... fields we learned how moving charge surrounds itself with a magnetic field.

Explanation:

Magnetic fields are generated by moving electrical charges, creating a magnetic force on other moving electric charges or magnets. The magnitude of this force is determined by the charge, speed, and magnetic field's magnitude and also depends on the angle between the velocity and magnetic field vectors. Notably, there is no magnetic force on static charges.

The relationship between charges, magnetic fields, and force can be understood through electromagnetic theory in physics. When electrical charges are in motion, they create magnetic fields. This phenomenon is observed as a magnetic force exerted on other moving charged objects or another magnet. The force that a moving electric charge experiences in a magnetic field is perpendicular to the direction of its velocity and the magnetic field.

The magnitude of this magnetic force is given by the product of the charge, the speed of its motion, and the magnitude of the magnetic field. It also depends on the angle between the velocity and magnetic field vectors. The direction of the force is governed by the right-hand rule, which states it will be perpendicular to both the direction of the moving charged particle and the direction of the applied magnetic field.

It's crucial to note that there is no magnetic force on static charges. Only when charges move, they produce magnetic fields that exert forces on other magnets. Hence, relative motion introduces a connection between electric and magnetic fields, where each can affect the other.

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Answer:

B

Explanation:

P = I² R

If P is 2 watts and R is 30 ohms:

2 = I² (30)

I = √(1/15)

I ≈ 0.26 A

Answer:

B. 0.26 amps is your answer

Answer: ionic bonds

Explanation:

Answer:

D) ionic bonds

Explanation:

Polar molecules are defined as the molecules in which we will have two poles or we can say that in these type of molecules the positive and negative center of the charge is separated by small distance.

this system of charge which is separated by small distance is known as dipoles or polar molecules.

Here we know that these two charged molecules will separate by small distance so here the force between these molecules are due to electrostatic force and hence they form a strong bond between the molecules.

This strong bond between charged molecules is known as Ionic Bonds

So here correct answer will be

(D) ionic Bond

Answer:

1750 Joules.

Explanation:

Work done = force * distance

= 7 * 250

= 1750 Joules.

Answer: Increase Reaction Rates

Explanation: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction

Answer:

leads to an increase in the rate of reaction

Explanation:

An increase in the temperature of a reaction often leads to an increase in the reaction rate because, when the temperature is increased, the rate of collisions between the reactant particles increases (which in turn increases the number of effective collisions) causing more products to be formed.

Rate of reaction is the amount of product formed per unit time of a reaction.

NOTE: According to collision theory, reactant particles must collide before a chemical reaction can occur/proceed. However, not all collisions leads to a reaction, the collisions that leads to reaction occurring is referred to as effective collision.

D the ability to do work

Explanation:

Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms.

Answer: -2 km

Explanation:

If we imagine Jin's movement to be the hypothenuse of a right triangle, then the southern component of Jin's movement corresponds to the side of the triangle opposite to the angle of 30 degrees. Therefore, the magnitude of this southern component is given by

However, the angle of 30 degrees is south of east: this means that the direction of this southern component is south, and since we generally take north as positive direction, we must add a negative sign, so the correct answer is

-2 km

Answer:

B

Explanation:

Edge 2021

Answer: A

Explanation: It isn't the exact answers but its is the closest. The exact answer is 3474.6.

Final answer:

To convert the Moon's diameter from miles to kilometers, multiply 2,159 miles by the conversion factor of 1.60934 to get approximately 3,474.76 kilometers, rounding to 3,454.4 kilometers, which is option A.

Explanation:

To convert the diameter of the Moon from miles to kilometers, we use the conversion factor that 1 mile is approximately equal to 1.60934 kilometers. Therefore, if the Moon's diameter is 2,159 miles, we multiply this number by the conversion factor to find the equivalent distance in kilometers.

2,159 miles * 1.60934 km/mile = 3,474.76146 kilometers

The correct answer from the given options would be A: 3,454.4km, which is the approximate value when rounded to one decimal place.

Correct Answers:

- The waves have a trough

- the waves have a crest

- the energy that is transferred move in a perpendicular direction

- particles move in an up and down motion

Answer:

A, c, d, e

Explanation:

Answer:

B

Explanation:

D is nonsense. The current keeps coming through all lights.

A is wrong. The exact opposite happens. More bulbs more resistance.

C is wrong. More resistance less current, not more.

So your answer is B because the voltage drop in each decreases when there are more bulbs.

The answer is B! Hope this helped

Answer:

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is 0.10  m.

When the speed of the bottle is 3 m/s, the average maximum height of the beanbag is 0.43  m.

When the speed of the bottle is 4 m/s, the average maximum height of the beanbag is  0.87 m.

When the speed of the bottle is 5 m/s, the average maximum height of the beanbag is  1.25 m.

When the speed of the bottle is 6 m/s, the average maximum height of the beanbag is  1.86 m.

Sorry for not answering early on! If anyone in the future needs help, I got these answers from 2020 egenuity, though I can't post the picture for proof. Stay Safe!

Answer:

B. There is a direct proportion between the mass and force listed in the table.

Explanation:

From the table, the values of force increases with increase in the value of mass.

if 5kg=25 N

Finding the contant of proportionality k;

k=25/5=5

thus M=k(F)...........where M is mass in kg and F is force in newton, then

M=5F

This show that for every value of mass, we get the value of Force if we multiply by a contant k=5

This means there is a direct proportionality relation between mass and force in the table.

Answer: Correct answer is B.

Hope this helps.

Answer:

chemical change through chemical process .

physical change means change in dimension.

A chemical change involves a change in the substance's composition, creating new substances with different properties, typically through reactions such as rusting or combustion. In contrast, a physical change alters a substance's form without affecting its composition, as in melting or condensation processes. The processes can also be classified as exothermic (releasing heat) or endothermic (absorbing heat).

The difference between a chemical change and a physical change pertains to the composition of the substance in question. A chemical change always results in the production of a new substance with different properties from the original matter. For example, the formation of rust from iron, or the combustion process in burning, are chemical changes. These result in the creation of substances distinct from the original matter.

On the other hand, physical changes do not affect the composition of the substance, but alter its state or form, such as the melting of ice into water or the condensation of steam into liquid water. These changes, while observable, do not produce new substances, hence maintaining the original properties of the matter.

Physical and chemical changes can also be differentiated based on whether they release or absorb heat, with exothermic processes releasing heat and endothermic processes absorbing heat. For example, the burning of a fuel is an exothermic process, while the operation of a cold pack is an endothermic process.

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Answer:

C. Saturated

Explanation:

When the solution is supplied with excess sugar the excess crystals descend to the bottom of the solution creating an area of very high concentration thus the bottom becomes saturated since no more solute can be added to dissolve.

Answer:

Explanation:

Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point.They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance. EXAMPLE: Solid ice melting into liquid

Answer:

Buffers

Explanation:

A buffer solution is a solution containing weak acids and their salts or weak bases and their salts.

A buffer solution is an equilibrium system that resists changes in pH or pOH when a small amount of an acid or base is added hence it is a solution of fairly constant pH value.

Answer:

6 V

Explanation:

In a circuit, the relationship between voltage, current and resistance is given by Ohm's law:

[tex]V=RI[/tex]

where

V is the voltage

R is the resistance

I is the current

In this circuit, we have

[tex]R=12.0\Omega[/tex] is the resistance

I = 0.500 A

so we can find the voltage of the battery by using Ohm's law:

[tex]V=(12.0 \Omega)(0.500 A)=6 V[/tex]

Answer: Protons give the nucleus a positive charge.

Explanation:

Protons - Gives of positive charge

Neutrons - Gives of neutral charge (No charge)

Electrons - Gives off negitive charge

The proton present in the nucleus gives the positive charge to the nucleus.

Explanation:

In the nucleus, there are two particles present, one is proton and the other one is neutron. Neutron is neutral in charge or say, it has no charge. Proton has the positive charge.

Therefore, among both the particle, proton gives the positive charge in the nucleus over the neutral charge of neutron. Thereby, nucleus acquires the positive charge from the proton. This positive charge is balanced by the negative charge of the electron, making atom on whole, neutral.

i think its very hot summers

This question is very unscientific.  It uses a lot of rubber words ... "very cold", "mild", and "very hot" ... words without definite meanings, that mean different things to different people, and may even mean different things to the same person at different times.

To me, any place in North America located south of the latitude of Chicago has a climate characterized by very hot, very humid, very oppressive, mercilessly long Summers, and weak, anemic, negligible, absurd excuses for Winters.