The diagram shows a side view of a skateboard ramp.



At which labeled points would the skateboarder have the most kinetic energy?

W and X
X and Y
Y and Z
W and Z

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.

Actualy the correct answer is going to be 20kg. And this how i got it. All i did was 10 divided by .5 and i got the answer.

Please mark brainiest please.

Force is the product of mass and acceleration. The force acting on the shopping cart is 10 N with an acceleration of 0.5 m/s². Then, mass of the cart is 20 Kg.

Force is an external agent acting on an object to change its state of rest or motion or to deform it. There are various kinds of forces, such as frictional force, magnetic force, gravitational force etc.

Newton's second law of motion states that, force of an objecting with a speed is the product of its mass and acceleration. Thus force increases with increase in mass or acceleration or with an increase in both together.

Given that, net force acting on the cart = 10 N

acceleration = 0.5 m/s².

Force = m a

mass m = F/a

             = 10 N/ 0. 5 m/s²

             = 20 Kg

Therefore, mass of the shopping  cart is 20 Kg.

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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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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

Pluto, a dwarf planet, has a unique orbit and composition, distinct from other planets in the solar system.

Pluto is considered a dwarf planet and is distinct from the gas giants in the solar system, being small, icy, and rocky. Its orbit is unique, shaped like a long ellipse and tilted compared to other planets. Initially thought to be a terrestrial planet, subsequent discoveries led to its reclassification as a dwarf planet.

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.

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 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:

[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: D.

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

hope this helps! ✌

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

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

Actual weight W = mg = 849 N
mass m = 849  / g = 86.54 kg
apparent weight m ( a+ g ) = 934 N
(a + g) = 934 / m = 10.79
from this acceleration a = 10.79 - g
= 10.79-9.8
= 0.9827 m / s^ 2

Answer:

It is called a metric system!

Explanation:

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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Answer:

c

Explanation:

I believe it's

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

Since it is a uniform accelerated motion, we can use the following SUVAT equation that relates initial velocity, final velocity, time and distance covered:

[tex]S=\frac{1}{2}(v_i +v_f)t[/tex]

where

S=440.0 m is the distance covered

vi is the initial velocity

vf=33.0 m/s is the final velocity

t=20.0 s is the time

Re-arranging the formula and substituting the data, we can find the initial velocity:

[tex]v_i = \frac{2S}{t}-v_f=\frac{2(440.0 m)}{20.0 s}-33.0 m/s=11.0 m/s[/tex]

Answer:

Answer is D) 20 N

Explanation:

A 2 kg bar of metal weighs approximately 19.58 newtons. This gives us an approximate weight of 19.58 newtons, which is closest to option D) 20 N.

To convert the weight of a metal bar from pounds to newtons, you can use the conversion factor: 1 pound is approximately equal to 4.44822 newtons.

To convert the weight of the metal bar from pounds to newtons, we can use the conversion factor 1 pound = 4.45 newtons. Therefore, to find the weight in newtons, multiply 4.4 pounds by 4.45 newtons/pound. This gives us an approximate weight of 19.58 newtons, which is closest to option D) 20 N.

To convert the weight of a metal bar from pounds to newtons, you would multiply the weight in pounds by the conversion factor of 4.44822, since 1 pound is approximately equal to 4.44822 newtons.

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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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Answer:

Explanation:

Basically, the reason why birds don't get electrically shocked, it's because they only reach a single path of the current. However, if they are able to toch something connected to the groun while they are on a cable, they will be shocked, becuase they are completeling the electrical cicle needed to flow the electricity.

Having said that, even a person can do that. Someone can grab a single power line without touching the ground or other cable, and that person will be fine, there can be thousands of volts and amperes, but that person will be totally fine.

Therefore, the word missing here is ground.

Birds sitting on a single power line don't get shocked because there is no path for the current to flow to the ground.