A ball rolls down a curved ramp as shown in the diagram below. Which dotted line best represents the path of the ball after leaving the ramp? A) A B) B C) C D) D

The advantages of wind energy over fossil fuels are that it does not emit pollutants, it is a renewable source of energy and it is a freely available source of energy.

What is wind energy?

The process that describes the generation of wind power or the mechanical power using the flow of wind itself, is known as wind energy.

Following are the advantages of wind energy over fossil fuels -

Thus, we can conclude that the advantages of wind energy over fossil fuels are that it does not emit pollutants, it is a renewable source of energy and it is a freely available source of energy.

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Answer:

To perform hands-only CPR, you want your non-dominant hand on top of your dominant hand and interlocking fingers, and push right under the breast bone 30 times. A good way to remember how fast you should perform CPR, listen to the beat of "Staying Alive." If the hands don't work after 30 times, pinch their nose, tilt their head back and blow two big breaths into their mouth, then do the chest pushing again. Keep repeating these steps until they respond, you feel a pulse, or 911 arrives.

Explanation:

I actually just learned how to do CPR this week it is really cool!

May I have Brainliest please? My next rank will be the highest one: A GENIUS! Please help me on this journey to become top of the ranks! I would really appreciate it, and it would make my day! Thank you so much, and have a wonderful rest of your day!

Answer:

Explanation:

wow, that's bad, she is going into shock.  falling asleep is really a bad sign. She's so injured and her body is going into shock.   This is super dangerous , she can go into a coma and pass away.  her heart rate has probably climbed so high she's not able to move blood well,  and she's probably so full of adrenaline that's all her organs are in shut down.  This is super bad.  She needs the medics as soon as possible.. seconds count. get them to her with as much haste as possible.  bring them to her immediately when the arrive.  :/  This seems more like a philosophy question than physics

Answer:

YOUR research question is …  

(Example: What will be the effect of changing ............on………?/How will changing........ affect ............? OR (How does the (IV) affect the DV?

Independent variable

(what you are changing in the experiment)

the type of liquids: example water or oil.

(  cm3   )

Dependent variable

(what you are measuring in the experiment)

This is what changes BECAUSE you changed the independent variable

The density of liquids

I will measure it using:

Grams and a scale.

Controlled variables

(What you will keep the SAME to have a fair test) How to control the variables?

(I will keep it the same by….) How they affect the data?

1

Same volume of liquid I will keep it the same by putting the same amount of liquid for the experiment. It will effect it but giving us an inaccurate results.

2

Measuring cylinder I will keep it the same by using the same measuring cylinder for each time I do the experiment. It will effect it by maybe putting in different measurements

3

Unit of measurement I will keep it the same by using the measurement tools and putting it in the same setting to avoid confusions It will effect it by lots if confusion and non similar measurments.

4

Hypothesis

(What you think will happen. Use the words increase/decrease)

(If …………increases, then ……………..will increase/decrease)

The liquids that weigh more (a higher density) will sink below the liquids that weigh less (a lower density). My scientific reasons for thinking this are because I think that thicker liquids have molecules that are closer to each other than thinner liquids.

(reference according to MLA)

Materials

(Make a list of all the equipment or apparatus that you will need)

(Don’t forget to put the size, quantity & volume of the equipment you will need)

Material/

Equipment Size/Quantity/

Volume Drawing Unit of measurement Absolute

uncertainties

Measuring cylinder  2   Cm3  

Oil 10 ml  

Cm3  

Scale 1  

grams  

Water  10ml  

Cm3  

Procedure

(This is your method, explain what you will do)

(Use simple and clear instructions)

1.  Prepare all materials and equipment needed for the experiment.

2.Measure the measuring cylinder

3. pour water to the measuring cylinder

4.put the measuring cylinder on top of the scale.

5. write down the weight of the water.

6.pour the oil into the measuring cylinder and repeat

7. after recording the weight of both of the liquids, we compare and repeat for a more accurate and precise measurement.

RESULTS

Title: Discover the density of liquids

The liquids  

 Mass of the cylinder  Mass of cylinder + liquid grams Mass of liquid grams Density grams/ cm3

1 oil

62.29 72.54 10.25 1.025

2  

water 62.29 72.83 10.54 1.054

3  

4  

5  

Show your calculations here

Conclusion

This experiment was about discovering the density of different liquids.

My hypothesis was” The liquids that weigh more (a higher density) will sink below the liquids that weigh less (a lower density). My scientific reasons for thinking this are because I think that thicker liquids have molecules that are closer to each other than thinner liquids.

My hypothesis was proved because the graph/results shows that the water is more dense.

I think this happens because (Explain your results using what you know about science. You may use books or internet. Include scientific language and diagrams to explain your conclusion) Some substances are made up of a large number of molecules. Only water molecules are attracted to one other Water molecules. The only thing that attracts oil molecules is other oil molecules. Because water is denser (heavier) than oil, they cannot combine.

Evaluation

Weaknesses in the method Realistic improvement

-To do more trials for more accurate results - That we focused on making sure to check the measurements with eye level.

This investigation has made me think of a new question, which is “why are oil less dense than water but oil is thicker”.

❏ I could test this by putting oil above water to see if its gonna float or not.

Explanation:

1. What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?

The Purpose of the lab is to displace water to determine volume.And weigh objects to get mass. Then We would divide the two and get density.How do we determine density?

2. What is your hypothesis (or hypotheses) for this experiment?

You get mass from weighing objects and you get volume from displacing water. Then you can divide them both to get density.

3. What methods are you using to test this (or each) hypothesis?

We were using scales and water displacement methods to get density.

Section II: Data and Observations

4. Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?

In a lab guide, the key results are those that support my working hypotheses or serve to reject these assumptions. Moreover, the key results may also be other discoveries that are important to understand the processes and/or mechanisms investigated in the experiment.

In my experience, the best way to summarize the key results is to create diagrams and illustrations that enables me to study relationships between different data

5. Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?

yes from the experiments we received numerical data for each object then we would use that data to find the mass volume to get density. We drew pictures to create a visual representation. You can simplify it into a small short worded sentence.

Section III: Analysis and Discussion

6. What do the key results indicate?

That we got the density from the mass and volume. By using different methods to get them.

7. If you constructed graphs, what trends do they indicate in your data?

We didnt need to construct graphs.

8. Were there any problems with the experiment or the methods? Did you have any surprising results?

No there was not any weird things that happened. The findings were normal.

Section IV: Conclusions

9. What do the results tell you about your hypothesis(es)?

That we were right.

10. How do the data support your claim above?

That we were right about our hyphothesis.

11. If you could repeat the experiment and make it better, what would you do differently and why? there is no point

Writing the Lab Report

Now you will use your answers from the questions above to write your lab report. Follow the directions below.

Section I: Experimental Overview

Use your answers from questions 1–3 as the basis for the first section of your lab report. This section provides your reader with background information about why you conducted this experiment and how it was completed. Outline the steps of the procedure in full sentences. It also provides potential answers (your hypothesis/es) relative to what you expected the experiment to demonstrate. This section should be 1–3 paragraphs in length.

Section II: Data and Observations

Use your answers from questions 4–5 as the basis for the second section of your lab report. This section provides your reader with the data from the experiment, in a summarized and concise way. No paragraphs are required for this section, but you do need to include the key data and observations from which you will generate your analysis and discussion. This section is objective.

Section III: Analysis and Discussion

Use your answers from questions 6–8 as the basis for the third section of your lab report. This section provides your reader with your interpretation of the data set. You will also give an example of any calculations or formulas you used to analyze your data. Also, you will want to include any graphs that you made and interpret them for the reader.

If you did construct graphs, your Student Guide included information on which graphs to construct. Graphs should have the following:

a. Appropriate titles

b. Appropriate labels for each axis

c. Appropriate scales for each axis

d. Correct units for the data

1. The force between the two charges is 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.

2. The resistance of 10 gauge aluminum wire over a 40 ft distance would be 0.506 ohms.

3. The cost of electricity from the automobile battery is 38.6 cents per kWh.

4. The current that would be carried through the body is 0.8 mA if dry.

1. The force between two point charges can be calculated using Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.

Using the values given, the force can be calculated as F = (k * q1 * q2) / r², where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them. Plugging in the values, the force can be calculated as 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.

2. The resistance of a wire is determined by its length, cross-sectional area, and resistivity. The resistivity of aluminum is higher than that of copper, so a larger cross-sectional area is required to achieve the same resistance. Using the gauge size conversion chart, 10 gauge aluminum wire has a cross-sectional area of 5.26 mm², which is approximately 83% of the cross-sectional area of 12 gauge copper wire.

Thus, the resistance of 10 gauge aluminum wire over a 40 ft distance can be calculated as R = (rho * L) / A, where rho is the resistivity of aluminum, L is the length, and A is the cross-sectional area. Plugging in the values, the resistance can be calculated as 0.506 ohms.

3. To calculate the cost of electricity per kWh, the total cost and the total amount of energy supplied must be known. Since the battery supplies 12 V and 51 A for one hour, the total energy supplied can be calculated as E = V * I * t, where V is the voltage, I is the current, and t is the time.

Plugging in the values, the total energy supplied can be calculated as 612 watt-hours (Wh). Since one kWh is equal to 1000 Wh, the total energy supplied can be converted to 0.612 kWh. Dividing the total cost by the total energy supplied gives the cost per kWh, which is 38.6 cents.

4. The current through the body can be calculated using Ohm's law, which states that current is equal to voltage divided by resistance. Using the values given, the resistance can be either 100,000 ohms or 300 ohms depending on whether the skin is dry or wet.

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According to the question the magnetic field is -3.925 x 10⁻⁶ T.

A magnetic field is an invisible force field created by a magnet or a moving electric charge. This field is made up of magnetic lines of force that move outward from the magnet or electric charge and can interact with other magnets and electric charges. The magnitude and direction of the force can be determined by measuring the strength and direction of the magnetic field.

The magnetic field can be determined using the equation:
F = qv x B,
where F is the force, q is the particle's charge, v is its velocity, and B is the magnetic field.
We can rearrange this equation to solve for B:
B = F / (qv)
In our case, the charge of the particle is 80 μC, its velocity is 20iˆ km/s, and the force is given by F = ma = (10g)(-9.8jˆ m/s²) = -98 mN.
Substituting these values into the equation, we find that the magnetic field is:
B = -98 mN / (80 μC x (20iˆ km/s)) = -3.925 x 10⁻⁶ T.

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Answer:

6-a .   7-c

Explanation:

V = 331 + 0.59 Tc

v= d/t = 272 / 0.8 = 340 m/s

340 = 331 + 0.59 Tc

340 - 331 = 0.59 TC

9 = 0.59 Tc

9/0.59 = Tc

Tc = 15.25°C

If v(t) is speed measured in meters per second (m/s), and t is time measured in seconds (s), then the constants A and B in

v(t) = At ³ - Bt

must have units of m/s⁴ and m/s², respectively; otherwise, the equation is dimensionally inconsistent.

[m/s] = A [s]³ - B [s]

[m/s] = [m/s⁴] [s]³ - [m/s²] [s]

[m/s] = [m/s] - [m/s]

[m/s] = [m/s]

Answer:

B

Explanation:

Fermium is a synthetic element with the symbol Fm and atomic number 100. It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.[3] A total of 19 isotopes are known, with 257Fm being the longest-lived with a half-life of 100.5 days.

It was discovered in the debris of the first hydrogen bomb explosion in 1952, and named after Enrico Fermi, one of the pioneers of nuclear physics. Its chemistry is typical for the late actinides, with a preponderance of the +3 oxidation state but also an accessible +2 oxidation state. Owing to the small amounts of produced fermium and all of its isotopes having relatively short half-lives, there are currently no uses for it outside basic scientific research.

The work done on 85 N boxes of books while carried horizontally 4m across a room is equal to zero. Therefore, option (C) is correct.

Work can be demonstrated as the energy used when a force is exerted to move an object through a definite displacement. The work done defines both the exerted force on the object and the distance moved by the object.

The applied force moves an object in a straight line in the direction of the exerted force over a displacement 'd'.

W= F × d

Where 'F' is the exerted force and 'd' is the displacement and W is work done.

Given, the weight of the box = 80 N

The displacement , d = 4 m

In order for to work to be done the box should move in the direction of exerted force as the books are moving forward direction and the applied force in an upward direction to carry the box.

Therefore, the distance moved in the direction of force is zero so the work done is also equal to zero.

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Answer:

I. force

II. electricity.

III. energy.

iv. pressure.

v. volume.

It will take approximately 11.86 Earth years for the asteroid to orbit the Sun.

Amateur astronomy is a fascinating hobby and can be an introduction to several practical and useful technologies.

The time it takes for the asteroid to orbit the Sun can be calculated using Kepler's Third Law: T^2 = 4 * π^2 * a^3 / G * M_Sun.

Where T is the orbital period in years, a is the semi-major axis in AU, G is the gravitational constant, and M_Sun is the mass of the Sun.

Plugging in values:

T^2 = 4 * π^2 * 6.3^3 / G * M_Sun

T = sqrt(4 * π^2 * 6.3^3 / G * M_Sun)

T ≈ 11.86 Earth years

Therefore, it will take approximately 11.86 Earth years for the asteroid to orbit the Sun.

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Simpson will it take 112 / 17 km to drive 560 km on a perfectly straight highway.

You can replace this computation with d = rt, which stands for "distance equals rate times time." To calculate speed or rate, use the speed formula, s = d/t, which asserts that speed is equal to distance divided by time.

The difference between speed and velocity is the amount of distance an object covers in a given amount of time and in a certain direction. Speed is a scalar quantity while velocity is a vector.

We know that:

v = 85

d = 560

Substitute

v = 85

d = 560 into formula d = v x t  :

560 = 85t

Cross out the common factor: 112 / 17 km

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We have that it takes the ball \(t=0.553sec\) to take to hit the ground

\(t=0.553sec\)

From the Question we are told that

Initial height \(s=1.5m\)

Generally the equation for Time  is mathematically given as

\(S=ut+1/2at^2\\\\1.5=0.5*9.8\)

\(t=0.553sec\)

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The paper ball will hit the ground from 1.5 m at 0.55 s.

Here we can use the free fall kinematics equations. Let's see that the paper ball falls from the rest, so the initial velocity will be 0.

\(y=y_{i}+v_{i}t-0.5gt^{2}\)

Here:

Now, the initial height will be 1.5 m, putting our reference system zero in the ball. So, the final height will be 0 m, because it hits the ground.

\(0=1.5-0.5(9.81)t^{2}\)

Therefore, we just need to solve it for t.

\(t=\sqrt{\frac{3}{9.81}}\)

\(t=0.55\: s\)

The ball will hit the ground at 0.55 s.

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The engine that provides twice more power will make it first

The car with the twice more power does more work

When a vertical force acts on an object moving horizontally, the work done by the force depends on the angle between the force and the displacement of the object. If the force is perpendicular to the displacement, no work is done, since the force does not contribute to the displacement of the object.

The work done is the same as the gravitational potential energy and this is;

W = F h

F  = Force

h = height of the object

Thus;

W = 25 * 1.5

= 37.5 J

Then;

Power = Work done/Time

= 100 J/ 2 s

= 50 W

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Answer:

1.25 m

Explanation:

This is the vertical height not the distance along the slope.

\(K=U\\\frac{1}{2}mv^{2} = mgh\\h = \frac{v^{2}}{2g}=\frac{25}{20}=1.25 m\)

The height the car can reach if the the track starts to climb upwards is 1.2742 meters up.

Kinetic energy is energy possessed by a body by virtue of its movement. Potential energy is the energy possessed by a body by virtue of its position or its relation with its surrounding systems.

P.E. = mass × g × height

K.E. = 0.5 × mass × (velocity)²

Given that the toy car has a mass of 0.025 kg and is traveling on a horizontal track with a velocity of 5 m/s. Now, the car starts to climb up vertically, therefore, the kinetic energy will be converted to potential energy.

Kinetic Energy = Potential Energy

0.5 × mass × (velocity)² = mass × g × height

Cancel mass from both the sides,

0.5 × (velocity)² = g × height

0.5 × (5 m/s)² = 9.81 m/sec² × height

height = 1.2742 meters

Hence, the car will travel 1.2742 meters up.

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Explanation:

The distance is the length of the path, or 400 m.

The displacement is the difference between the final position and the initial position.  Since the track is a circle and the end back where they started, the displacement is 0 m.

If a person runs around a 400 m track,then the distance covered by the person would be 400 meters, while the displacement covered by the person would be zero meters.

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard.

Displacement describes this shift in location.

As given in the problem If a person runs around a 400 m track, then we have to find the distance and the displacement covered by him,

The distance is 400 meters, which is how long the path is.

The distance between the end location and the starting position is known as displacement. The displacement is 0 m since the track is round and ends where it began.

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Answer:

Explanation:

Let the required depth be d .

Sound will first travel trough 480 m deep lake . Then it will enter granite layer .   Sound travelling through granite will reach oil level , get reflected and come back to the surface of lake as echo . Total time taken by sound to travel total distance  is .93 s

Total distance = 2d + 2 x 480 m

= 2d + 960 m

speed of sound in granite is given as 6000 m / s and speed through water is 1480 m /s

total time taken

= 2d / 6000 + 960 / 1480 = .93

2d / 6000 + .6486 = .93

2d / 6000 = .2814

d= 844.2 m

The force of viscosity is F = k r v η. Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v.

What is viscous force?

Viscosity refers to a material's capacity to resist movement between its layers. It is the force that resists relative motion between the layers. It is also known as viscous force.

What is viscous force formula?

In the above equation, the shear force is the viscous force, which is the only internal resistance that causes shear stress to develop along with the fluid layers. As a result, the viscous force formula will be given as. F=Aμdudy.

Hence  F = k r v η is a correct answer.

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Answer:

3/4

Explanation:

Answer:

the angular speed of the person increases, being able to make more turns and faster.

 K₂ = K₁ I₁ / I₂

Explanation:

When the divers are turning the system is isolated, so all the forces are internal and therefore also the torque, therefore the angular momentum is conserved

initial, joint when starting to turn

         L₀ = I₁ w₁

final. When you shrink your arms and legs

         Lf = I₂ w₂

         L₀ = Lf

         I₁ w₁ = I₂ w₂

when you shrink your arms and legs the distance to the turning point decreases and since the moment of inertia depends on the distance squared, the moment of inertia also decreases

      I₂ <I₁

         w₂ = I₁ / I₂ w₁

therefore the angular speed of the person increases, being able to make more turns and faster.

When it goes into the water it straightens the arm and leg, so the moment of inertia increases

          I₁> I₂

           w₁ = I₂ / I₁ w₂

therefore we see that the angular velocity decreases, therefore the person trains the water like a stone and can go deeper faster.

In both cases the kinetic energy is

          K = ½ I w²

the initial kinetic energy is

          K₁ = ½ I₁ w₁²

the final kinetic energy is

          K₂ = ½ I₂ w₂²

we substitute

          K₂ = ½ I₂ (I₁ / I₂ w1² 2

          K₂ = ½ I₁² / I₂ w₁² = (½ I₁ w₁²)  I₁ / I₂  

          K₂ = K₁ I₁ / I₂

therefore we see that the kinetic energy increases by factor I₁/I₂

Answer:

The sympathetic nervous system, part of the autonomic nervous system, also known as the involuntary system, is in charge of the fight-or-flight response, a response to the stress that leads to a hormonal cascade that boosts alertness and heart rate to prepare the body to respond.

Explanation:

Answer:

Rapid heart rate and breathing: Heartbeat and respiration rate increase to provide the body with the energy and oxygen needed to fuel a rapid response to danger. 2  Trembling: The muscles tense and become primed for action, which can cause trembling or shaking.

The letter that represents the various descriptions is as follows:

5.) Angle of incidence: B

6.) Object: D

7.) Plain mirror:A

8.) Reflection: E

9.) Angle of reflection: C

10.) Normal: F

The law of reflection in a plain mirror states that the angle of reflection is equal to the angle of incidence.

The diagram explains the law of reflection on a plain mirror because it shows the reflection of the object D as E after creating an angle of incidence B on the plane mirror surface A which is equal to the angle of reflection C.

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Answer:

Asalamalikum maryam

Following are the characteristics that help to distinguish between man's and women's voice

Supersonic flights are moving with speed greater than that of sound. This speed through air will combine the pressure waves and creates shock waves. Continuation of shock waves leads to sonic boom in air.

Sonic booms are sound created on the ground by overpressure in the air generated by fastly moving objects. Similar to someone dumping goods from a moving car, an aircraft travelling at supersonic speeds continuously produces shock waves that cause sonic booms to travel throughout its flight path.

The boom seems to be swept rearward as it moves away from the aeroplane from its point of view. The boom will strike the ground in front of the aircraft if the aircraft makes a rapid turn or pulls up.

The abrupt start and release of pressure following the building by the shock wave or "peak overpressure" is what is heard as a "sonic boom" on the ground. Only a few pounds per square foot change in pressure results from a sonic boom, which is about equivalent to the pressure shift we experience in an elevator.

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Explanation:

Although the iceberg has less internal energy per mass, its enormously greater mass gives it a greater total energy than that in the small cup of coffee

Answer:

The hot coffee has a higher temperature, but not a greater internal energy. Although the iceberg has less internal energy per mass, its enormously greater mass gives it a greater total energy than that in the small cup of coffee.

Explanation:

Answer:

It is Newton's first law of motion also referred  to as the law of inertia.

Explanation:

Answer: True

Explanation:

Pencils indeed should not be used as tools when working inside a computer because it is made of Lead.

Lead is a conductor of electricity and as such if it is left inside the computer at even miniscule quantities, it can redirect electricity and damage components in the process.

If one wants to work inside a computer, it is best to use tools like tweezers and needle-nose pliers.

Due to the presence of graphite(A good conductor of electricity), Pencils should not be used inside the computer to change the setting of switches.

The conductors are the materials that can allow electricity and heat to pass through them.

Since the pencils are made up of graphite which is a good conductor of electricity. When we use pencils to do something inside the computer circuits and if some portion of the graphite remains on the circuit board.

Now due to the good conducting property of the graphite, it will allow the current to flow and the short circuit of the circuit board can take place which will damage the computer.

Thus due to the presence of graphite(A good conductor of electricity). Pencils should not be used inside the computer to change the setting of switches.

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