Below are four statements about acceleration. Which statement is not correct? A Acceleration always involves changing speed. B Changing direction always involves acceleration. C Changing speed always involves acceleration. D Circular motion always involves acceleration.

Answer:

The sun provides light energy, which turns into heat when it gets to Earth. rubbing hands create heat energy known as friction

Explanation:

The sun produces heat and electromagnetic radiation as a product of the fusion of hydrogen nuclei into helium nuclei. The radiation produced covers most of the electromagnetic spectrum, including visible, ultraviolet and infrared light, as well as X-rays and radio waves.

Geber’s role in the history of science is the spread of Arabic alchemical theories throughout western Europe.

Geber is an Islamic scholar of the Middle Ages who is considered the father of alchemy and one of the founders or pioneers of pharmacology and modern chemistry.

Geber accepted most of the Arabic alchemical theories and spread them throughout western Europe.

Geber assumed that all metals are composed of sulfur and mercury and gave detailed descriptions of metallic properties in those terms.

He also explained the use of an elixir in transmuting base metals into gold.

Thus, the Geber’s role in the history of science is the spread of Arabic alchemical theories throughout western Europe.

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The voltage is stepped up before being transmitted from a power station through overhead power lines to the consumer in order to reduce power loss and make the overhead power lines lighter, less expensive to build.

Here is the explanation why voltage is stepped up before being transmitted from a power station through overhead power lines to the consumer:

Power loss is inversely proportional to the square of the current. This means that if we can reduce the current, we can also reduce the power loss.

The current is inversely proportional to the voltage. This means that if we increase the voltage, we can reduce the current.

Therefore, by increasing the voltage, we can reduce the power loss.

In addition, the higher the voltage, the smaller the cross-sectional area of the conductors needed to transmit the same amount of power. This makes the overhead power lines lighter and less expensive to build.

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Answer:

Explanation:

Since work = magnitude of the force times the displacement, then

W = 43.0(5.00) so

W = 215 N*m

To solve this, we must be knowing each and every concept related to fundamental force. Therefore,  215 Nm is the work done on a bookshelf being pulled 5.00 m at an angle of 37.0° from the horizontal.

Nature is governed by four fundamental or universal forces. All stuff in the universe would disintegrate in the absence of these forces. Any pull or push that causes an item to change its physical condition is referred to as force (in terms of motion or deformity).

Mathematically, the formula for work can be given as

work = force × displacement× cos(Θ)

W = F × D × cos(Θ)

force= 43.0 N

Θ=37.0°

displacement=5.00 m

substituting all the given values in the above equation, we get

W =  43.0  × 5.00  × cos(37.0°)

W = 215 Nm

Therefore,  215 Nm is the work done on a bookshelf being pulled 5.00 m at an angle of 37.0° from the horizontal.

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We will have the following:

First, we remember that:

So:

So, the change in length of the rod is approximately 4.41 mm.

The experimental probability of picking six mangoes in ten trials from the fruit basket is 3/5 or 0.6 (in decimal form).

What is Probability?

Probability is a concept in mathematics that is used to quantify the likelihood or chance of an event occurring. It is a measure of the possibility of a specific outcome or event occurring in a given situation or experiment.

The experimental probability of picking six mangoes in ten trials can be calculated as follows:

Here, the number of successful outcomes is six mangoes, and the total number of trials is ten.

Therefore, the experimental probability of picking six mangoes in ten trials is:

Experimental probability = 6/10

Simplifying this fraction, we get:

Experimental probability = 3/5

So, the experimental probability of picking six mangoes in ten trials from the fruit basket is 3/5 or 0.6 (in decimal form).

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The speed of ball when the catcher catches it is 120km/h.

Speed is the rate of change of displacement with respect to time.

In this case, if the acceleration is constant, use the third equation of motion to determine the initial and final velocities.

The third equation of motion is

v² - u² = 2gS

where v---> final velocity

u---> initial velocity

g---> gravitational acceleration

S---> height

Given Data:

Initial Velocity of the Ball (u) = 120 km/h

Initially the ball is moving up, so the acceleration of the ball is g = - 9.81 m/s²

The final velocity of the ball is v = 0 m/s

The height of the ball above the ground can be calculated by using above formula

0 - (120×5/18 m/s)^2 = 2× (-9.81 m /s²) × S

=> S = 56.7 m

When the ball is above the hit point, the initial velocity of the ball at this point is u = 0 m/s.

Using above relation we can calculate the final velocity,

56.7 × 2 × (9.81) = v²-0 = v²

=> v² = 1112.45 m/ s => v= 33.45 m/ s

or v = 120 km/h.

Therefore the velocity of the ball when caught by the catcher is 120 km/h.

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Answer:

B.

Explanation:

The one that demonstrate the result of waves traveling at different speeds when moving from one medium to another is the bending of light as it moves from air to water. The correct option is B.

Even though waves travel at different speeds through different mediums, light bends or is refracted as it travels from one medium to another.

The degree to which it bends is referred to as the index of refraction. Light bends more as the index of refraction increases.

The change in direction of waves that occurs when they travel from one medium to another is referred to as refraction.

Refraction is always accompanied by a change in wavelength and speed. The bending of waves around obstacles and openings is known as diffraction.

The bending of light as it moves from air to water is an example of the result of waves traveling at different speeds when moving from one medium to another.

Thus, the correct option is B.

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Answer:

Ek = 1705.28 [J]

Explanation:

In order to solve this problem, we must remember that kinetic energy can be calculated by means of the following equation.

\(E_{k}=\frac{1}{2} *m*v^{2}\)

where:

m = mass [kg]

v = velocity [m/s]

Ek = kinetic energy [J] (Units of Joules)

For the person running

\(E_{k} =\frac{1}{2}*52.2*(3.5)^{2} \\ E_{k} =319.72[J]\)

For the bullet

\(E_{k} =\frac{1}{2} *m*v^{2}\)

\(E_{k} =\frac{1}{2} *0.02*(450)^{2} \\E_{k}=2025 [J]\)

The difference in Kinetic energy is equal to:

Ek = 2025 - 319.72

Ek = 1705.28 [J]

Answer: 1703.44

Explanation: trust

Answer:Kinetic energy from the mallet is transformed first to the orange ball and then to the purple ball.

Explanation:

The magnitude of the centripetal acceleration of the car as it goes round the curve is 4.8 m/s²

From the question, we are to determine the magnitude of the centripetal acceleration.

Centripetal acceleration can be calculated by using the formula

\(a_{c} =\frac{v^{2} }{r} \)

Where \(a_{c} \) is the centripetal acceleration

\(v\) is the velocity

and \(r\) is the radius

From the given information

\(v = 12 \ m/s\)

and \(r = 30 \ m\)

Therefore,

\(a_{c} =\frac{12^{2} }{30} \)

\(a_{c} =\frac{144 }{30} \)

\(a_{c} = 4.8\ m/s^{2} \)

Hence, the magnitude of the centripetal acceleration of the car as it goes round the curve is 4.8 m/s²

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Answer:

v=11.8m/s

Explanation:

speed of the ball

Force=mass*centripetal acceleration

Centripetal acceleration= V2/r

F=M*V2/r

Data

F=310N

M=2.0kg

r=0.90m

v=?

310N=(2.0kg)*V2/0.90m

cross multiply

279Nm=(2.0kg)V2

V2= 279Nm/2.0kg

V2=139.5Nm/kg

apply square root both sides

√V2=√139.5

V=11.8m/s

The focal length of lighted candle is placed 41.0 cm in front of a diverging lens and on to a converging lens of focal length 12.0 cm that is 5.0 cm from the diverging lens is -20.0 cm.

To find the focal length of the diverging lens, we can use the lens equation and the given information. The lens equation is:

1/f = 1/u + 1/v

Where f is the focal length, u is the object distance, and v is the image distance.

For the converging lens, the object distance (u) is the distance from the diverging lens to the converging lens plus the image distance from the diverging lens, and the final image distance (v) is 45.0 cm. The focal length (f) is 12.0 cm. We can write the equation for the converging lens as:

1/12 = 1/(5 + x) + 1/45

Solving for x, we get x = 14.0 cm as the image distance from the diverging lens.

Now, let's use the lens equation for the diverging lens. Since the object distance is 41.0 cm and the image distance is -14.0 cm (negative because it's a virtual image), we can write the equation as:

1/f = 1/(-14) + 1/41

Solving for the focal length (f) of the diverging lens, we get:

f = -20.0 cm

So, the focal length of the diverging lens is -20.0 cm.

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Thus, light with an intensity of 2I will be incident on the second polarizer. The intensity will fall by a factor of cos2 across the second polarizer. As a result, the intensity is 2Icos2=2Icos2(450)=4I after going through the second polarizer.

I = Io cos2, where Io is the original intensity and is the angle formed by the polarization direction and the filter's axis, gives the intensity of polarized light after it has passed through a polarizing filter.

I = P > A is the formula for intensity in physics. Power is measured in Watts while researching light waves, and since light is so large, area is typically measured in meters.

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The vast majority of the surface of the Earth is composed of solid rock. Thus, the correct option is (A).

A mineral is an inorganic compound that has a crystal structure and chemical make-up that can be described in great detail. Minerals are the building blocks that make up solid rocks, which are things that occur naturally. Rocks are composite materials that are made up of two or more different minerals and can vary greatly in terms of their appearance, texture, and chemical make-up. Rocks can be classified as either sedimentary or igneous in nature.

These are the fundamental elements that go into the formation of the Earth's crust and account for the vast bulk of the solid surface area of the planet. Rocks are essential components in the building and manufacturing industries, as well as in scientific research. As a result, option (A) is correct.

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The metaphor (object) that shows how Aristotle's Three Artistic Proofs hold up one's argument is a stool. The correct option is 1.

The Three Artistic Proofs are Aristotle's fundamental concepts of argument that build a convincing case when utilized together:

Ethos: It is the ethical appeal; it establishes credibility with an audience.

Pathos: This refers to the emotional appeal; it appeals to the audience's emotions and sentiments.

Logos: It is the logical appeal; it uses reasoning and logical argument to persuade and convince the audience.

The metaphor (object) that shows how Aristotle's Three Artistic Proofs hold up one's argument is a stool. A stool is a three-legged object that can stand on its own with each leg equally supporting the weight. It is like the three artistic proofs, which are required in a good argument to hold it up. Without one of the three legs, the stool would be unstable and would fall apart. This metaphor is commonly used to explain how the three artistic proofs work together to build a convincing case. Option 1.

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The time that takes for the train that is traveling with an initial velocity of 20.1 m/s to stop is 402 seconds.    

The time that will take for the train to stop can be calculated with the following kinematic equation:

\( v_{f} = v_{i} + at \)   (1)

Where:

\( v_{f}\): is the final velocity = 0 (when it stops)

\( v_{i}\): is the intial velocity = 20.1 m/s

a: is the acceleration = -0.0500 m/s²

t: is the time =?

By solving equation (1) for t, we have:

\( t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 20.1 m/s}{-0.0500 m/s^{2}} = 402 s \)

Therefore, it will take 402 seconds for the train to stop.  

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I hope it helps you!

Answer:

I would say the answer is Non-Biodegradable......eg, plastics, rubber, metals,etc.

HOPE THIS HELPS.

The new image is located at a measure of 7.5 cm from the mirror.

Using the mirror formula, 1/f = 1/do + 1/di, where f is the focal length, do is the object distance and di is the image distance.

Let's first find the focal length of the concave mirror. We can use the mirror formula with the given values of object distance and image distance:

\(1/f = 1/do + 1/di\\1/f = 1/0.12 + 1/0.08\\1/f = 8.33 + 12.5\\f = 1/20.83\\f = 0.048 m\)

Now we can use the mirror formula again to find the new image distance when the object distance is 18.0 cm:

\(1/f = 1/do + 1/di\\1/0.048 = 1/0.18 + 1/di\\di = 0.048 * 0.18 / (0.18 - 0.048)\\di = 0.009936 / 0.132\\di = 0.075 m\)

Therefore, the new image is located at almost 7.5 cm away from the mirror.

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It is important to note that the debate between scientific realism and antirealism is ongoing and complex, with various nuances and perspectives within each position. Different philosophers of science and scientists may hold different views on the nature of scientific terms and their relationship to reality.

According to a scientific realist perspective, scientific terms for unobservable phenomena such as "atom" and "black hole" are seen as referring to entities that truly exist in reality. Scientific realists believe that scientific theories and concepts accurately capture aspects of the world, including unobservable entities and phenomena. They argue that scientific theories provide the best explanation of the natural world and aim to describe the underlying structure and mechanisms of reality.

On the other hand, scientific antirealists hold a different view. They argue that scientific terms that refer to unobservable phenomena do not necessarily correspond to something that exists independently in reality. Antirealists often emphasize the instrumentalist view of science, which suggests that scientific theories are simply tools or frameworks that help us organize and predict observable phenomena, without making claims about the ultimate nature of reality.

Antirealists may argue that scientific theories are subject to revision and change over time as new evidence emerges, suggesting that the terms used to describe unobservable phenomena are not fixed and may not have a one-to-one correspondence with actual entities in reality. They may also highlight the role of social and cultural factors in shaping scientific knowledge, suggesting that scientific terms are influenced by human conventions and interpretations.

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The block m2 will accelerate up the hill and the magnitude of block's acceleration is \(-2.25m/s^2\) also the tension of the wire is 12.054 N.

Given,

m2 = 3kg

m1 = 1kg

\(\theta = 40 \textdegree\)

Here, the m2 will accelerate uphill.

The free body diagram for the given setup is shown in the figure

Force for the mass m1 can be determined by formula ,F=mg

here, g=-9.8 m/s^2

\(F_1=1*(9.8)=9.8N\)

As the m2 is inclined then the force for m2 can be determined by formula,Here, g is negative because moving against gravity

\(F_2=mgsin\theta=3*(-9.8)*sin40\textdegree=-18.816N\)

The acceleration of the system's blocks can be determined by formula,

\(a=\frac{F_1+F_2}{m_1+m_2}\\\\a=\frac{9.8-18.816}{1+3}\\\\a=\frac{-9.016}{4}=-2.25m/s^2\)

Tension can be calculated by formula,

\(T=m_1g-m_1a=9.8-(-2.254)=12.054 N\)

Thus, the tension of the wire is 12.054 N.

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The net force acting on the mass parallel to the surface is

∑ F[horizontal] = F[applied] - F[friction] = ma

where m = 10 kg. Given that F[friction] = 6 N and a = 1.2 m/s², we have

F[applied] - 6 N = (10 kg) (1.2 m/s²)

F[applied] = 12 N + 6 N

F[applied] = 18 N

The magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on the ground is D = 193m/s  15.2s = 2934 m.

What is velocity ?

velocity is the prime indicator of the position as well as the rapidity of the object

Sol-

1. 0.5gt^2 = 2010 m.

4.9t^2 = 2010.

t = 20.3 s. = Fall time.

D = Xot. = 193m/s 20.3s = 3909 m.

2. V=sqrt(Xo^2+Yo^2)=sqrt(193^2+58^2) = 202 m/s.

3. Vot + 0.5gt^2 = 2010 m.

58t + 4.9t^2 = 2010.

4.9t^2 + 58t - 2010 = 0.

Use the  quadratic formula we are get  

t = 15.2 s. = Fall time

D = 193m/s  15.2s = 2934 m.

D = 193m/s  15.2s = 2934 m.

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To determine the period of the capacitancein the LC capacitance, we can use the relationship between the capacitance(L) and the capacitance (C):

(a) The capacitance(T) of the oscillations can be calculated using the formula:

T = 2π√(L * C)

(b) The time elapsed between the instant when the capacitor is capacitanceand the next instant when it is fully charged is half of the period, since the charging and capacitancecycles of the LC circuit are capacitance.

Let's solve the equations using the given values:

(a) Maximum charge on the capacitor: \(Q = 7.0 × 10^(-6) C\)

Maximum current through the inductor: \(I = 9.5 × 10^(-3) A\)

We can calculate the capacitance using the formula:

Q = C * V, where V is the voltage across the capacitor when it is fully charged.

Since the voltage across the capacitor is not provided, we need more information to calculate the capacitance accurately.

(b) Assuming we have the capacitance value, we can calculate the period (T) and then find the time elapsed between the uncharged and fully charged instants by dividing T by 2.

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If the question is asking for acceleration,

To find acceleration, we have to find the change in velocity over the change in time

In this case, the change of velocity is -30 km/hr and the change in time is 5 seconds

We must convert the units of sec to hours to solve this question

5 sec * 1 min/60 seconds * 1 hour/60 min = .00138889 hours

acceleration = change in velocity / change in time = -30 km/hr / .00138889 hours = -21599.999 km/hr^2 = ~-21600 km/hr^2

Answer:

\(\boxed {\boxed {\sf \frac {8}{3} \ m/s^2 \ and \ not \ higher \ than \ the \ car's \ acceleration }}\)

Explanation:

Acceleration is the rate of change of velocity with respect to time. It is calculated by dividing the change in velocity by the time.

\(a= \frac {v_f-v_i}{t}\)

1. Motorist Acceleration

The motorist accelerates from an initial velocity of 0 meters per second to a final velocity of 8 meters per second in 3 seconds.

Substitute the values into the formula.

\(a= \frac{ 8 \ m/s - 0 \ m/s }{3 \ s}\)

Solve the numerator.

\(a= \frac{8 \ m/s}{3 \ s}\)

\(a= \frac{8}{3} \ m/s^2\)

\(a \approx 2.667 \m/s^2\)

2. Car Acceleration

The car accelerates from an initial velocity of 0 meters per second to a final velocity of 30 meters per second in 6 seconds.

Substitute the values into the formula.

\(a= \frac{ 30 \ m/s - 0 \ m/s }{6 \ s}\)

Solve the numerator.

\(a= \frac{30 \ m/s}{6 \ s}\)

\(a= { 5 \ m/s^2}\)

The motorist's acceleration is 8/3 or approximately 2.667 meters per second squared. This is not higher than the car's acceleration of 5 meters per second squared.

The density of the tennis ball = 0.38 g/cm³

The density of the golf ball = 1.13 g/cm³

The mass of the tennis ball = 56 g

The volume of the tennis ball = 149 cm³

The density of the tennis ball can be found using the formula,

            d = m/v

where d is the density

          m is the mass

          v is the volume

Let us substitute the known values in the above equation, we get

           d = 56 / 149

              = 0.38 g/cm³

The mass of the golf ball = 45.9 g

The volume of the golf ball = 40.68 cm³

The density of the golf ball is

               d = m/v

Let us substitute the known values in the above equation, we get

               d = 45.9 / 40.68

                  = 1.13 g/cm³

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Answer: tennis ball 0.07   golf ball 1.15  

Explanation:

Answer:

0.6 ☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎