Come on guys, I'm wasting all my point on this one question! Someone please answer it!

2. Discuss the relationship between electric and magnetic fields.

Answer: D.

Explanation:   Orange, at 3 meters per second if you calculate the net force being applied to the system.

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The ball would move to the right under a thrust force.

We know that in physics that an object would continue in its state of uniform motion or at a state of rest unless it has been acted upon by external forces that are acting on the object.

In this case, we have a ball that is at rest and then we have a car that is moving uniformly but is suddenly swerved to the left hand side. We know that the thrust that is produced by the car would act on the ball in the opposite direction.

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Answer:

Helium has a full valency electron shell

Explanation:

Noble gases are gases at in general they don't react with any other element easily. They are a group of elements that make up Group 18 on the periodic table. They are referred to as inert gases because of their unreactive nature because they have a full valency electron shell. They have the following general properties: colourless, odourless, tasteless, and are nonflammable gases.

The tennis ball will bounce to a height of approximately 1.828 meters after the third bounce when it loses 23.0% of its energy with each bounce starting from a height of 4 meters.

If a tennis ball is released from a height of 4 meters and bounces on the floor three times, each time losing 23.0% of its energy due to heating, we can calculate its height after the third bounce. The initial potential energy (PE) of the ball when released is converted into kinetic energy as it falls and then back into potential energy as it bounces upward. After each bounce, the ball retains only 77% (100% - 23%) of its energy because of the energy lost to heat. Therefore, after the third bounce, the ball has
(0.77)³ or about 45.7% of its original energy.

Here is the calculation to find the height (h) after the third bounce:

[tex]PE{initial }[/tex]= mg[tex]h_{initial}[/tex] = mg[tex]h_{final}[/tex]

[tex]h_{final}[/tex] = (0.77)³  h_initial

[tex]h_{final}[/tex] = (0.77)³
(4.0 m) = 0.457
(4.0 m) = 1.828 m.

The tennis ball will bounce to a height of approximately 1.828 meters after the third bounce.

Answer:

24kph

Explanation:

John has a boat that will travel at the rate of 15 kph in still water. he can go upstream for 35 km in the same time it takes to go 140 km downstream, then it would go 24 kph downstream, therefore the correct answer is option B.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter / second.

As given in the problem John has a boat that will travel at the rate of 15 kph in still water. he can go upstream for 35 km in the same time it takes to go 140 km downstream.

Let us take the speed of the stream would be x kph.

35 / 15 -x = 140 / 15 + x

x = 9

The speed of the boat downstream = 15 + 9

                                                            = 24 kph

Thus, it would go 24 kph downstream, therefore the correct answer is option B.

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Answer:

[tex]\rho_{stone} = \frac{56 g}{25 mL} = 2.24 g/mL[/tex]

Explanation:

Mass of the cylinder = 80 g

water added in the cylinder = 20 mL

mass of water + cylinder = 100 g

mass of water added = 100 g - 80 g = 20 g

density of water = [tex]\frac{mass}{volume}[/tex]

[tex]\rho = \frac{20 g}{20 mL} = 1 gm/mL[/tex]

now when stone is put into the cylinder then the volume reached to 45 mL

so volume displaced by the stone = 45 mL - 20 mL

V = 25 mL

mass of stone = 156 g - 100 g = 56 g

now density of stone is

[tex]\rho_{stone} = \frac{mass}{volume}[/tex]

[tex]\rho_{stone} = \frac{56 g}{25 mL} = 2.24 g/mL[/tex]

Answer:

c

Explanation:

Answer:

False

True

Explanation:

False: The reason is because theyare bonded by molecules

True: This is because a physical change does not change the chemical composition

Answer:

It is called a metric system!

Explanation:

The radius of the satellite's circular orbit is approximately 11,350,000 meters or 11,350 kilometers.

Given,

Mass of satellite = 6000 kg

Revolution time = 5700s

To determine the radius of the circular orbit of a satellite orbiting the Earth, the following equation based on the laws of circular motion can be used:

[tex]r = (\frac{G \times M \times T^2}{4\pi^2})^{(1/3)}[/tex]

Where:

r is the radius of the orbit

G is the gravitational constant (approximately 6.67430 × 10⁻¹¹m³ kg⁻¹ s⁻²)

M is the mass of the Earth (approximately 5.972 × 10²⁴ kg)

T is the period of the orbit

Substituting these values into the equation:

[tex]r = (\frac{G \times M \times T^2}{4\pi^2})^{(1/3)}[/tex]

[tex]r = \frac{6.67430 \times 10^{-11} \times 5.972 \times 10^{24} \times (5700)^2}{(4\pi^2)^{(1/3)}}[/tex]

r = 1.135 × 10⁷ meters

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Direct evidences are obtained rom the investigation area itself or directly from a sample under study and not from previous records or surveys.

Direct evidence is a type of proof that frequently utilizes the form of witness testimony or eyewitness narratives. When a witness states that they witnessed an accused person conduct a crime, overheard someone else say a certain word or words, or saw a certain act occur, these are examples of direct evidence.

The truth of an assertion is supported directly by direct evidence, i.e., without an intermediary inference. A witness describes what they personally saw or heard, but they may also use any other sense, such as scent, touch, or pain.

Other evidences collected from surveys,  or from previous records, hearing from indirect witness etc. are not take as direct evidences.

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The volume of the gas after the change of pressure will be 4.5 litres.

Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law, is an experimental gas law that states that as a container's volume grows, a gas's pressure tends to drop. The temperature remains constant.

Given that a 1.50-litre sample of dry air in a cylinder exerts a pressure of 3.00 atmospheres at a temperature of 25°C. Without changing the temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.00 atmospheres.

Use Boyle's law:-

P₁V₁ = P₂V₂

Put the values of initial pressure, volume and final pressure then calculate the value of final volume as the temperature of the process is constant.

1.50 x 3.00 = V x 1.00 atm

V₂ = 1.50 x 3.00 / 1.00

V₂ = 4.50 L

Therefore, the volume of the gas will be 4.5 litres.

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The total amount of energy remains constant in an isolated system. It implies that energy can neither be created nor destroyed, but can be change from one form to another.

Answer

13.06 m

Explanation

The height reach ca be calculated using the one of the linear equation.

v² = u² - 2gs

where u ⇒ is the initial speed,

          v ⇒ is the final speed

        g ⇒ is the acceleration due to gravity and

       s ⇒ the height reached.

v² = u² - 2gs

12² = 20² - (2×9.8×s)

144 = 400 - 19.6s

19.6s = 400 - 144

        = 256

s = 256/19.6

    = 13.06 m

Answer:

d = 128 m

Explanation:

Here given that van slows down as it travels up a inclined steep hill

So here we can assume that through out the motion its acceleration will remain constant.

Now we can use kinematics to find out the distance traveled by it

As we know that acceleration is defined as

[tex]a = \frac{v_f - v_i}{t}[/tex]

here we know that

[tex]v_f = 12 m/s[/tex]

[tex]v_i = 20 m/s[/tex]

time = 8 s

now we have

[tex]a = \frac{12 - 20}{8} = -1 m/s^2[/tex]

Now in order to find out the distance it moved we can use

[tex]v_f^2 - v_i^2 = 2 ad [/tex]

now we will plug in all above data

[tex]12^2 - 20^2 = (2)(-1)d[/tex]

[tex]144 - 400 = -2d[/tex]

[tex]d = \frac{-256}{-2} = 128 m[/tex]

so it will cover total distance of 128 m

I believe it's

A valley of rolling hills is an example of anticlines and synclines.

This statement is in-doubtingly true

It is true that Often what one expects to see influences what is perceived in the surrounding environment.

The environment can be defined as the sum of all living and non-living elements and their effects on human life.

Non-living or abiotic elements include water, land, sunlight, rocks, and air, while all living or biotic elements are animals, plants, forests, fisheries, and birds.

The noun surroundings can refer to the immediate environment, including all nearby objects, as well as the location itself and the circumstances or conditions in which you find yourself.

When someone constructs a house, the surroundings influence which direction it faces and how many windows it has.

What one expects to see frequently influences what one perceives in the surrounding environment.

Thus, the given statement is true.

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Final answer:

Collaboration and communication in science are key to disseminating research findings and advancing scientific knowledge. Through collaboration and peer review, scientific work is validated and can be further built upon. Effective communication also helps in securing funding and informing the public.

Explanation:

Collaboration and communication are crucial in science because they enable the dissemination of research findings and the advancement of scientific knowledge. Through collaboration, scientists can plan, conduct, and analyze research collectively, which enhances the quality and impact of their work. Effective communication is necessary for sharing results beyond the confines of conferences and meetings, achieving this through peer-reviewed publications. These publications undergo a process of peer review to ensure that the research is original, significant, logical, and thorough. This process also allows other scientists to reproduce the experiments and expand upon the findings, creating a foundation for further discovery and innovation.

Furthermore, effective communication skills are critical when interacting with funding agencies or the general public to convey the importance and relevance of scientific work. Without transparent communication and open collaboration, scientific progress would be stymied, and opportunities for new discoveries may be lost. Additionally, successful collaboration often relies on technology to bridge geographical distances, allowing for ongoing dialogue and exchange of ideas without the necessity of being in the same physical location.

The concrete barrier provides a resistance force equal to the car's impact force of 3,250 N, illustrating Newton's Third Law of Motion, wherein every action has an equal and opposite reaction.

In the scenario where a 2,500 kg car hits a concrete barrier with a force of 3,250 N, it is important to understand Newton's laws of motion to determine the resistance force provided by the barrier. Newton's Third Law states that for every action, there is an equal and opposite reaction. Hence, the barrier would provide an equal resistance force of 3,250 N back on the car, as it is the action-reaction pair described by this law.

Newton's Third Law of Motion :

This situation exemplifies Newton's Third Law of Motion, which is often paraphrased as, 'To every action, there is always an opposed and equal reaction.' In crash tests and automobile mechanics, this law helps us understand and predict the forces involved during a collision. When the car exerts a force on the barrier, the barrier exerts an equal and opposite resisting force on the car, confirming that the car's impact force and the barrier's resistance force are indeed equal.

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Final answer:

The net force acting on the car, which is towing a trailer, is calculated using Newton's second law of motion and is found to be 3045 newtons.

Explanation:

To determine the net force acting on the car, we use Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). Since the car and trailer are initially at rest and they start to accelerate together, the net force on the car can be calculated by adding the masses of the car and the trailer and then multiplying the total mass by the given acceleration.

First, we find the total mass of the car and the trailer combined: total mass = mass of car + mass of trailer = 1200 kg + 540 kg = 1740 kg. Then, we multiply this total mass by the given acceleration to find the net force:

Net force = total mass × acceleration = 1740 kg × 1.75 m/s² = 3045 N.

Therefore, the net force acting on the car is 3045 newtons.

Nuclear power is particularly beneficial in areas with high population concentrations and where there are few other energy resources. Due to uranium's high energy efficiency, the environmental impact is minimized, and it's a carbon-free power source, helping combat global warming. However, its benefits need to be weighed against potential safety and sustainability risks.

In which situations is nuclear power most beneficial? Nuclear power is most advantageous in scenarios where there are few other energy resources and in high-concentration population centers. The benefits of nuclear energy over fossil fuels are numerous, particularly when it comes to the efficiency of uranium. This substance generates significantly more power per unit weight or volume than coal, meaning less material needs to be mined, thus reducing environmental impact. In addition, nuclear power does not emit carbon dioxide during operation, making it a strong contender for reducing global warming.

Contrary to the proximity of fossil fuel supplies, nuclear power does not rely on nearby sources of fossil fuels, making it beneficial for isolated locations where transportation of fossil fuels would be logistically challenging or expensive. Likewise, for areas with a high concentration of people, the scalability and high-energy yield of nuclear power can meet the substantial electricity demands more effectively. However, when it comes to regions with scattered populations such as few people in scattered towns, distributed generation technologies like solar and wind might be more suitable and cost-effective.

It is essential, however, to weigh these advantages against the sustainability and safety concerns associated with nuclear power. The production of dangerous waste that must be stored safely for thousands of years, the potential for nuclear proliferation, and the risk of accidental radiation leaks are crucial factors that need to be considered carefully by scientists, policy makers, and citizens alike.

Nuclear power is most beneficial in 1. if there is a high concentration of people, 3. if there is an isolated locations, and 4. if there are few other energy resources.

Nuclear power is beneficial in certain situations due to its capability to generate large amounts of energy without emitting air pollutants like fossil fuels. Here are the most suitable situations for nuclear power:

Other situations, such as having nearby supplies of fossil fuels or having few people in scattered towns, might not derive as much benefit from nuclear energy due to the cost and scale of nuclear power plants.