Question 3
During discussion, a student states, "The law of conservation of energy is not actually useful because no system is ever truly isolated from the rest of the universe. No system is truly closed. There will always be some amount of energy entering or leaving a system." You believe that energy conservation is a useful concept, and you want to
explain why. Which of the following responses is most true?

Since you wanted to use some brain-mapping techniques to identify anatomical functioning, the method that would be the best choice is option A. MRI.

In PET scans, the breakdown of option B:  radioactive materials in the body and the release of gamma rays produce a functional view of the brain.

FDG, which stands for "fluorodeoxyglucose," is a simple sugar (like glucose) that is frequently employed in PET scanning. It is injected into the bloodstream and builds up inside the body, where it emits gamma rays as energy.

Note that without injecting any kind of dye or tracer, brain mapping techniques like magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) scans can be used to detect the anatomical functioning of the brain. The diagnosis and treatment of neurodegenerative illnesses can both benefit greatly from these techniques.

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According to the given information self gravity two forces keep stars in equilibrium.

The correct option is B.

The push or pull on a mass-containing item alters its velocity. An external force is an agent that has the power to alter the rest or flowing condition of a body. It has a direction and a magnitude. Like we discovered in a previous session, forces are significant because they create motion changes.

An object can change its dimensions or shape, begin moving, stop moving, accelerate, or decelerate as a consequence of the a force acting on it. When two things contact, they exert pressures on each other that are identical in size but directed in the opposite direction.

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The time period of the ball’s motion will be 0.14 seconds

The frequency of the motion will be 7 Hz

The ball’s angular velocity will be 43.96  rad/second

given

a) frequency = 7 rev / s = 7 Hz

time period = 1 / frequency

           = 1 / 7 = 0.14 seconds

The period of the ball’s motion will be  0.14 seconds

b) The frequency will be 7 Hz

c) The ball’s angular velocity  = 2 * π * f

                                                = 2 * 3.14 * 7 = 43.96  rad/second

The ball’s angular velocity will be 43.96  rad/second

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The motion of the ball is translational and rotational.

Rotational motion because the ball is continuously rolling along its axis.

Translational motion because the ball is also moving forward and not just rotating at a fixed place.

But all these have a force acting on it that affects the motion of the ball.

The forces are :

"Normal Force,"

"Gravity Force,"

"Force Friction,"

"Applied Force."

It is due to the result of the friction, which causes the ball to stop.

The reason the ball rolls is due to the force that is imparted to it.

Therefore, the motion of the ball is fully under the control of forces acting on all the sides of the ball.

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τ=Fd

In this instance, it will

τ=Fballdball+Farmdcenter of mass

τ = 4*9.81*.7 + 4*9.81*.35 = 41.2

and both of our forces have a magnitude of 4g*cos(55), but they are located in different places.

τ = 4g*cos(55)*(.35+.7) = 23.6

The term "magnitude" refers to an object's greatest size and direction. Scalar and vector quantities both use magnitude as a common factor.

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Answer:

A) 10 m/s^2

Explanation:

1KG=10

so 10kg bucket = 100N

1) find fnet by finding the sum of the vertical forces (gravity is going down so its negative)

2) fnet = 200N (Lift) - 100N (Bucket)

fnet = 100

fnet = mass × acceleration

3) 100 = 10a

answer: 10 = a

sorry this is very rushed.

The dog’s linear speed will be 1.88 m/s

The angular speed of the merry-go- round will be  0.85  rad/sec

centripetal acceleration = [tex]v^{2} / r[/tex]

given

r = 2.2 m

linear speed = ?

centripetal acceleration  = 1.6 [tex]m/s^{2}[/tex]

centripetal acceleration C(a) = [tex]v^{2} / r[/tex]

             linear speed = [tex]\sqrt{C(a) * r}[/tex]

                                   = [tex]\sqrt{1.6 * 2.2 }[/tex] = [tex]\sqrt{3.52}[/tex]  = 1.88 m/s

The dog’s linear speed will be 1.88 m/s

angular speed = linear speed / radius

                        = 1.88 / 2.2 = 0.85  rad/sec

The angular speed of the merry-go- round will be  0.85  rad/sec

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When a person turns on a lightbulb by connecting its circuit to a battery then chemical energy is converted to electrical energy which is in turn converted to heat energy.

Initially chemical energy is stored in the battery.  When the circuit is completed with a lightbulb then the chemical energy gets converted into electrical energy. And then electrical energy changes in the light bulb into heat energy.

When the terminals of the battery are connected through the light bulb, a pathway is created for the flow of charge. Negatively charged electrons flow from the - to the + terminal through the bulb. This charge flow  converts chemical potential energy into electrical energy.

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Since the force of gravity acting on a body in space is zero;

The mass of a body is inversely related to the acceleration of the body if a constant force is applied to the body.

The greater the mass, the lesser the acceleration of the body.

Mathematically:

Force = mass * acceleration

The force acting on a body in space is zero.

Hence, acceleration = force / mass

For a mass of 110 kg;

acceleration = 0 / 110

Acceleration = 0

For a mass of 110 kg;

acceleration = 0 / 80

Acceleration = 0

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Answer:

[tex]v=3.4081\frac{m}{s}[/tex]

Explanation:

[tex]F=ma\\F=12.4N\\m=7.9kg\\a=\frac{12.4N}{7.9kg}\\a=1.5696\frac{m}{s^2}[/tex]

[tex]v^2=v_0^2+2a\Delta x\\v_0=0\frac{m}{s}\\a=1.5696\frac{m}{s^2}\\\Delta x=3.7m\\v^2=(0\frac{m}{s})^2+2(1.5696\frac{m}{s^2})(3.7m)\\v^2=11.6152\frac{m^2}{s^2}\\v=\sqrt(11.6152\frac{m^2}{s^2})\\v=3.4081\frac{m}{s}[/tex]

If the average distance from Venus to the Sun is given to be 0.7AU, its time period is 208.49 days.

Kepler's laws of planetary motion :

According to this law, the semi-major axes of the planets' orbits are directly proportional to the squares of the planets' orbital periods.

radius of the venus = 0.7AU

radius of the earth = 1 AU

orbital period of the earth = 365 days

According to the Kepler's 3rd law of planetary motion :

T² ∝ R³

T² = k R³

k = T²/ R³

[tex]k = \frac{T^2_v}{R^3_v} = \frac{T^2_e}{R^3_e}[/tex]

T² /(0.7)³ = (365)² /(1)³

T = [tex](0.7/1)^{\frac{3}{2}}[/tex] X 365

T = 208.49 days

If the average distance from Venus to the Sun is given to be 0.7AU, its time period is 208.49 days.

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Answer:

Explanation:

Given:

n = 8

t = 4 s

______

f - ?

T - ?

Frequency:

f = n /t = 8 / 4 = 2 Hz

Period:

T = 1 / f = 1 / 2 = 0.5 s

Answer:

The Earth's major plates are the African plate, the Antarctic plate, the Eurasian plate, the North American plate, the South American plate, and the Pacific plate.

Explanation:

The speed at the edge of a disc of radius 8.5 cm that rotates at the rate of 2.5 rev/s will be 21.25 m/s

Angular velocity is the rate of change of angular displacement  

Mathematically it can also be calculated as linear speed divided by radius

linear speed = omega * radius

                     = 2.5 * 8.5

                     = 21.25 m/s

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No, her cells need glucose to react with oxygen to release enough energy to exercise. Option B.

Oxygen, glucose, and amino acid molecules from air and food are the fuel your body needs to function every day. Without these molecules, cells cannot do what they need to do to keep the body healthy. Our cells cannot use starch as is. Before starch enters cells, it must be broken down into individual glucose molecules.

The glucose molecule is then transported inside the cell and used to facilitate the cell's respiratory response. Athletes believe that all they need to do is eat a variety of foods and train because their bodies simply need different types of food molecules to function properly. Living organisms mainly use these two types of molecules, glucose, and ATP, as chemical energy.

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The total quantity of an economy's final goods and services demanded at different inflation rates is the aggregate demand curve.

The total amount spent in an economy on domestic goods and services is known as aggregate demand, or AD. AD is technically what economists refer to as total planned expenditure. Consider aggregate demand to be total spending for the time being; we'll go into more detail about it in later articles.

All four elements of demand are included in aggregate demand:

The price level is one of several variables that affect this desire. The entire amount spent on domestic products and services at each price level is displayed on an aggregate demand curve.

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The magnet affected the block of material next to it because it exerts an attractive or repulsive force on other objects.

Magnets do the retinue things: Attract certain materials, such as iron, nickel, cobalt, certain steels, and other alloys. apply an attractive or repulsive force on other magnets (opposite poles attract, like poles repel).  

Magnetic forces are oblivious forces; they pull or push on objects without touching them. Magnets are only attracted to a few 'magnetic' metals and not all matter. Magnets are attracted to and repel other magnets.

So we can conclude that Materials with a magnetic field can attract other materials with such a field. Materials that are not magnets do not have a net outer magnetic field.

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Answer:

a)  -9  [tex]m/s^2[/tex]

b)  112.5 meters

Explanation:

Here is a formula for acceleration.

[tex]a=\frac{V_{f} -V_{o} }{t}[/tex]

We are given

[tex]V_o=45[/tex] m/s

[tex]V_f=0[/tex] m/s

[tex]t=5[/tex] s

Lets solve for [tex]a[/tex].

[tex]a=\frac{0-45}{5}[/tex]

[tex]a=\frac{-45}{5}[/tex]

[tex]a=-9[/tex] [tex]m/s^2[/tex]

Here is a formula for displacment.

[tex]x=V_o t+\frac{at^2}{2}[/tex]

[tex]V_o=45[/tex] m/s

[tex]t=5[/tex] s

[tex]a=-9[/tex] [tex]m/s^2[/tex]

Lets solve for [tex]x[/tex].

[tex]x=45*5+\frac{-9*5^2}{2}[/tex]

[tex]x=225+\frac{-9*25}{2}[/tex]

[tex]x=225+\frac{-225}{2}[/tex]

[tex]x=225+-112.5[/tex]

[tex]x=225-112.5[/tex]

[tex]x=112.5[/tex]

Answer:

I think the answer is the option h

hope this helps you

The tension in the cable that pulls the elevator upwards with an acceleration of 2.0 m/s² is 4200 N. The right option is A) 4200 N.

Tension is defined as the force transmitted through a rope, string or wire when pulled by forces acting from opposite sides.

To calculate the tension in the cable, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 2

Hence,  the tension in the rope is 4200 N, the right option is A) 4200 N.

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If relativistic effects are to be less than 6%, then must be less than 1.06. Hence, at a relative velocity (v) of 0.33c, gamma is = 1.06. This problem is solved using the Lorentz Factor.

The Lorentz factor is a correction parameter used to calculate relativity. Without this component, relativistic motion calculations simply fail, and we can obtain speeds that surpass the speed of light, which cannot be.

The calculation to the above solution is given as follows

Given:

γ = 1/ √1-(v²/c²)

It is logical to simplify by squaring both sides

⇒ γ² = 1/ 1-(v²/c²)

Taking the reciprocal of both sides, we have

1-(v²/c²) = 1/γ²

Transposing we have

v²/c² = 1 - 1/γ²

Since we are looking at v, lets us isolate it:

v = √[1 - (1/γ²) · c]

Inserting the Lorentz factor which is

γ = 1.06, we have

v = √[1 - (1/1.06²) · c]

Hence,

v = 0.33c

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Full Question:

If relativistic effects are to be less than 6% then gamma must be less than 1.06. At what relative velocity is gamma = 1.06?

Answer: both force and gravitational force

Explanation:

Social dynamics behind lower -class drug use is homelessness, criminal behaviors, association with gangs and unemployment whereas social dynamics behind middle -class drug use is peer relationships, extramarital relations and distortion of interpersonal family relationships.

Social factors that increase the risk for adolescent drug use can include popularity, bullying, peer relationships, and association with gangs.

Other possible factors can be social and familial influences. This can result in financial hardships due to job loss. It may also lead to certain behavior that can put family at risk and can also cause domestic violence within relationships.

Other social problems linked with SUDs can be housing instability, homelessness and unemployment.

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Time period  and frequency of the pendulum are respectively 3.17 second and 0.315  second⁻¹. The velocity of its bob at the equilibrium is

140 cm/s.

Given parameters:

Length of the pendulum, L = 2.5 m = 250 cm.

Mass of the bob, m = 75 g

And,  bob is pulled 10 cm above equilibrium and then released.

acceleration due to gravity, g = 9.8 m/s².

Hence, time period of the pendulum is, T = 2π√(l/g)

= 2π√( 250/980) second.

= 3.17 second.

Frequency of the pendulum , n = 1/T = 1/3.17 second⁻¹ = 0.315  second⁻¹.

Let v be the velocity of the bob at equilibrium,

Kinetic energy at equilibrium = potential energy at the highest point

⇒ 1/2 × 75 × v² = 75 × 980 × 10

⇒ v = √(2×980×10)

= 140 cm/s.

So, the velocity at equilibrium after its bob is pulled 10 cm above equilibrium and then released is 140 cm/s.

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The chair and floor have a static friction coefficient of 7.9523 and a kinetic friction coefficient of 0.8114, respectively.

The braking force of an item is static friction. The resistance humans encounter when attempting to move something fastened to the ground without actually moving thier own bodies or the surface that are sitting on is described as static friction.

Adhesion, a slight chemical attraction between contact objects, is what causes static friction. Friction is also produced by the interaction of the flaws on each surface.

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If you stand in front of a flat mirror. The one-half of your height will be seen yourself entirely. Option C is the correct answer.

Take a look at your room's four walls. The height of a wall is measured from the ground to the ceiling. Remember how your class is organized in the school assembly, with the tiniest child in the front and the tallest youngster at the back.

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A)  The reading on the scale is 250 N.

B)  The reading on the scale is 122.45 N.

C)  The reading on the scale is 0 N.

Given parameters:

Weight of the box is : W = 250 N.

As the acceleration due to gravity is 9.8 m/s², the mass of the box be: m = W/g = 250/9.8 kg = 25.51 kg

A) When the elevator is moving upward at constant speed,  there has no acceleration. the reading on the scale remains same and it be 250 N.

B) When the elevator is accelerating downward at 5 meters per second squared, the apparent weight of the box be, W₁ = W  -ma = 250 -25.51×5 N = 122.45 N. So,  the reading on the scale is 122.45 N.

C) If the elevator cables broke and the elevator fell freely,  the elevator is accelerating downward at the same magnitude of acceleration due to gravity, so the apparent weight of the box be, W₁ = W  -mg = 0. So,  the reading on the scale is 0 N.

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Based on the total power output by the wind farm, the mean electrical power for 1 home =  1200 W

The mean electrical power needed for 1 home is determined as follows:

Mean power for 1 home = total power output by the farm / total number of homes

Based on the data provided:

The total number of homes that can be powered by the power produced from the wind farm is 580,000 homes

The total power output by the wind farm is 696 MW

Converting MW to watts by multiplying by 1000,000

696 MW = 696 * 1000000 W

696 MW = 696000000 W

Mean electrical power for 1 home = 696000000 / 580000

Mean electrical power for 1 home =  1200 W

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Answer:

1200 W

Explanation:

696 MW = 696,000,000 watts

1MW = 1,000,000 watts

696 MW = 580,000 homes

1 home = 696,000,000/580,000

1 home = 1200 W

The object assigned is used to copy all the data, and when accessing each character in a string, such as for copying purposes, you would typically use a while loop is a false statement.

Until the provided condition (there is only one) evaluates to false, a while loop iterates indefinitely. Your loop will then end, and the execution process will continue. While a conditional expression is evaluated as true, its statements are carried out.

The copy variable is a pointer to the same item and points to it. Basically, this object with the values a: 1, b: 2, is saying that there are now two methods to contact me. You must go through either the obj variables or the replica variable to reach me, and whatever you do to me through these routes (gateways) will have an impact on me.

Therefore, the object assigned is used to copy all the data, and when accessing each character in a string, such as for copying purposes, you would typically use a while loop is a false statement.

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