A roller coaster pushes a 25 kg person upward with a force of 300 N. What is the acceleration?

Answer:

50%.......

Explanation:

is the correct check it then send feedback

Answer:

The answer is C

Explanation:

Scientists use creativity to determine which smaller questions are likely to yield results, imagine possible answers to their questions, and devise ways to test those answers.

Creativity is the key to make the scientific experiments more efficient and and economic and hence, a creative method can save money when you have limited resources.

A scientific method  is constituted by  a set of stages and instructions to conduct a scientific experiment to attain  a possible solution for a problem. Scientific methods have to be reproducible and effective to bring a valid solution for a hypothesis based on an observation.

Creative thinking is always paramount significance because it leads more ways and identifies the pitfalls in the available scientific methods. Creativity improves the way of designing a scientific experiments and to gather informations also.

Therefore, creative method can save money when you have limited resources is a true statement regarding a scientific method.

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false, as it depends on the type of defibrillator being used. In general, automated external defibrillators (AEDs) are designed to be used by anyone, even those without medical training, in an emergency situation.

These devices typically have adhesive pads with sensors that are placed directly on the patient's bare chest. It is recommended to remove any clothing or jewelry that may interfere with the sensors and the shock delivery.However, there are also some newer AED models that are specifically designed to be used over clothing. These devices have pads with enhanced sensors that can detect and compensate for the extra layer of fabric. They are often used in settings where quick access to bare skin may not be possible, such as on sports fields or in public places. So, in summary, the pads used to deliver the electrical shock to the heart can be placed over clothing in some cases, but it is generally recommended to remove any clothing or jewelry that may interfere with the sensors and the shock delivery for most AEDs. It is important to follow the specific instructions for the defibrillator being used and to seek professional medical help as soon as possible in any emergency situation.

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When you mix 100 pounds of soil with 100 pounds of KCl, the resulting soil would have a pH near 7.0.

This is because KCl is a neutral salt and does not affect the pH of the soil. The modest CEC of the soil means that it has a relatively low capacity to retain positively charged ions such as K+. Therefore, adding KCl would not significantly affect the pH of the soil. The resulting soil would have a similar pH to the original soil, but it may have a slightly higher pH due to the dilution effect of adding more material. However, the pH increase would be minimal and would not make the soil moderately alkaline (pH 7.5 to 8.5) or calcareous.

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So the magnitude of the impulse given is 50 kg m/s.

An impulse is defined as the force applied for a time. For a force with a constant magnitude, we can find the magnitude of the impulse by multiplying the magnitude of the force by the time that force is exerted. If the force is not constant, we simply integrate the force function over the set time period.

Impulse is denoted by J. And mathematically it is given as

                               J= Ft = Δp

And Δp is the change in momentum of the body which is given so we get,

                         J=50kg m/s

which is required impulse.

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Answer:

gas

Explanation:

Solids are compact together, liquida arent compact but are still close, and gases are free roaming and may be very far apart from eachother.

Answer:

The Answer is Gas.

Explanation:

Answer:

The battery it consider as one of the circuits elements.

16.565 m/s

Hence, the shell is moving with velocity 16.565 m/s when it hits the rock.

here's your answer hopes it helps with your question!

Step-By-Step: If a seagull drops a shell from rest at a height of 16 m, the shell would have been moving with a velocity of when it hits the rock.

What is Mechanical Energy?

Mechanical energy is the Combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

The expression for total mechanical energy is as follows ME= PE+KEA

as for the given problem, If a seagull drops a shell from rest at a height of 16 m , as the seagull drops from that height the potential energy stored is converted into kinetic energy,

height = 16 m 

1/2mv²= mgh

 v = √(2gh)

m is the mass of the object

v is the velocity of the object

by substituting the respective values

v = √(2×9.81×16)

v =17.71 meter/ seconds

Thus ,shell would have been moving with a velocity of 17.71 meters/ seconds when it hit the rock.

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The question asks us to find the value of Th (the hot reservoir temperature) for which the exhaust power would be one-fourth as large as in part (c). In part (c), we found the exhaust power by considering the electric output power of 1.40 MW and the turbine efficiency.

Let's denote the exhaust power in part (c) as Pc. We can write Pc = 1.40 MW.

To find the value of Th in the new scenario, we need to consider that the exhaust power will be one-fourth of Pc. Let's denote this new exhaust power as Pnew.

We know that the efficiency of the turbine in the new scenario is two-thirds of the efficiency of a Carnot engine. Let's denote the efficiency of the Carnot engine as ηc and the efficiency of the turbine in the new scenario as ηnew.

We can use the formula for efficiency: η = 1 - (Tc/Th), where Tc is the cold reservoir temperature and Th is the hot reservoir temperature.

Since the efficiency of the turbine is two-thirds of the Carnot engine's efficiency, we have ηnew = (2/3)ηc.

Now, let's express Pc and Pnew in terms of ηc and ηnew:

Pc = ηc * (Th - Tc)
Pnew = ηnew * (Th - Tc)

Since we want Pnew to be one-fourth of Pc, we can write:

Pnew = (1/4) * Pc

Substituting the expressions for Pc and Pnew, we have:

ηnew * (Th - Tc) = (1/4) * ηc * (Th - Tc)

We can simplify this equation by canceling out (Th - Tc):

ηnew = (1/4) * ηc

Since we know that ηnew = (2/3)ηc, we can substitute this in the equation:

(2/3)ηc = (1/4) * ηc

Now, let's solve for ηc:

(2/3)ηc = (1/4) * ηc

To cancel out ηc, we can multiply both sides by 12/ηc:

(2/3) * (12/ηc) * ηc = (1/4) * ηc * (12/ηc)

Simplifying, we get:

8 = 3

This equation is not true, which means that there is no value of Th for which the exhaust power would be one-fourth as large as in part (c). The given information or calculations might have some error. Double-checking the calculations and the given values may help to identify the mistake.

In summary, there is no value of Th that would satisfy the condition given in the question.

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Answer:

the answer is 1, oil and water

Answer:

It is oil and water i took the quiz and got it correct !

Hope this helps you! :D

In order to compare the numbers, let's put all of them into the decimal form:

We can see that the greater one is 26.8 (all other numbers are close to 2, and this one is close to 27).

The numbers in decrescent order are:

26.8, 271%, 2.62, 2 2/5, 2.26.

Answer:

26.8

Explanation:

2.26 < 2.4 < 2.62 < 271/100 = 2.71 < 26.8

Given that

heat capacity of water = 4200

heat capacity of aluminium = 897

heat capacity of oil = 1900

heat capacity of gold = 129

Heat capacity is the amount of heat a material absorbs to increase its temperature by 1 degree Celsius.

So, larger the heat capacity of a material lower will be the temperature change.

If equal amount of energy is applied to the materials, then gold will have the greatest temperature change as its heat capacity is lowest than other materials.

Answer:

Explanation:is the law means that the police are the law

Answer:

- Its entropy increases.

Explanation:

Entropy is defined as a 'measure of the amount of energy in a physical system that cannot be used to do work.' It is also employed to denote randomness, disorder, or uncertainty of the arrangement/system. In the given system, the melting of ice denotes the 'increase in entropy' as the amount of energy unavailable to do work increases('absorbs 3.33 x 10³J of energy'). Thus, this signifies that the entropy increases with a rise in temperature as it allows the substance to have greater kinetic energy.

Answer:

A charged object in an electric field experiences a force due to the field. The electric field strength, E, at a point in the field is defined as the force per unit charge on a positive test charge placed at that point.

Explanation:

Answer:

A balance and a beaker of water!

Explanation:

Krishne wants to measure the mass and volume of a key. The tools that are to be used are – a balance and a beaker of water.

Mass will be represent with the amount of matter that is in an object. This will be measured in terms of kilogram. The mass can easily be measured with balance.

Volume is the quantity of matter that is in the object. This is measured in terms of cubic meter. If you drop the key in a beaker of water, the water inside the beaker will increase and this increases the volume of water that will be equal to volume of key.

The minimum angular velocity needed to keep the person from slipping downward is given by:

ωmin = √(μg/r)

where:

μ is the coefficient of static friction

g is the acceleration due to gravity

r is the radius of the cylinder

Plugging in the given values, we get:

ωmin = √(0.72)(9.8 m/s^2) / (6.6 m) = 1.4 rad/s

Therefore, the minimum angular velocity needed to keep the person from slipping downward is 1.4 rad/s.

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Given

Procedure

Dimensions of v are L/T

The answer would be:

The letter a is multiplying to one dimension in time, so it must be a value of distance over two of time. LT^(-2)

The letter b is in the numerator so it must be a distance dimension. L

The letter c is being operated as a subtraction in the denominator so it must be time T

The final equilibrium temperature (in °C) of the system when ice and water vapor are combined can be calculated using the principle of energy conservation and the specific heat capacities of ice and water.

To determine the final temperature, we can apply the equation:

(m₁ * c₁ * ΔT₁) + (m₂ * c₂ * ΔT₂) = 0

Where:

- m₁ is the mass of ice (22.0 kg)

- c₁ is the specific heat capacity of ice (2.09 J/g·°C)

- ΔT₁ is the change in temperature of ice (final temperature - 0.00 °C)

- m₂ is the mass of water vapor (4.80 kg)

- c₂ is the specific heat capacity of water (4.18 J/g·°C)

- ΔT₂ is the change in temperature of water (final temperature - 100.0 °C)

Solving for the final temperature, we find:

(22.0 kg * 2.09 J/g·°C * ΔT₁) + (4.80 kg * 4.18 J/g·°C * ΔT₂) = 0

Substituting the given values, we can solve for ΔT₁ and ΔT₂. Once we have those values, we can find the final temperature by adding ΔT₁ to 0.00 °C.

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The net torque about the axle on the pulley is 20 Ncm.

The net torque about the axle on the pulley can be calculated by first determining the direction of rotation. Since there are two forces acting in opposite directions, the pulley will not rotate in either direction unless there is a net torque acting on it. Therefore, we need to find the difference between the clockwise torque and the counterclockwise torque.

To calculate the torque, we need to use the formula: torque = force x distance. The distance is the radius of the pulley, which is half of the diameter, or 2 cm.

On the left side, the force of 20 N is pulling down and to the left, creating a clockwise torque. The distance from the axle to the force is 2 cm, so the torque is 20 N x 2 cm = 40 Ncm.

On the right side, the force of 30 N is pulling down and to the right, creating a counterclockwise torque. The distance from the axle to the force is also 2 cm, so the torque is 30 N x 2 cm = 60 Ncm.

Therefore, the net torque is the difference between these two torques: 60 Ncm - 40 Ncm = 20 Ncm.

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Answer:

The Awnser Is D

Explanation:

Hope This Helps

Answer:

1.wavelength

Explanation:

2. Frequency

3.Speed

4.Amplitude

Answer:

Wave is the propagation of disturbance from one place to another in an organised manner. Waves can be mechanical waves or non-mechanical waves. Mechanical waves like sound waves, require a medium to propagate. While electromagnetic waves are non-mechanical waves that do not require a medium and can travel through a vacuum.

If the particles of the medium move in a direction perpendicular to the wave propagation then the waves are called transverse waves. Longitudinal waves are waves in which the particles of the medium vibrate parallel to the direction of wave propagation.

5 Important Properties of Waves

The main properties of waves are as follows –

Property 1:Amplitude

The maximum displacement of the wave from the mean position is called the amplitude of the wave. It is the maximum height from the centre line to the crest or the trough. The crest is the highest point of the wave and the trough is the lowest point of the wave. Amplitude is measured in metres.

Property 2: Frequency

The number of vibrations passing a fixed point in a given amount of time is called frequency. The unit of frequency is Hertz.

Property 3: Wavelength

Wavelength is the distance between two identical points (adjacent crests or troughs). It is measured in metres. Frequency and wavelength are inversely proportional to each other.

Property 4: Time Period

The time taken by a complete wave to pass through a particular point is called the time period. The time period is measured in seconds. The time period is the reciprocal of the frequency.

Property 5: Speed

For a wave, speed is the distance travelled by a particular point on the wave in the given interval of time. Speed is measured in metres per second.

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

\(density = \frac{4000}{2} = 2000 \\ \)

We have the final answer as

Hope this helps you

The magnitude of the resultant vector is 13.9m.

The size of the resulting vector can be determined using the Pythagorean theorem. As you can see from these two examples, the result of adding three or more rectangular vectors is easy to determine using the Pythagorean theorem. The vectors should be added in a different order. Equation 2 Subtracts the vectors in opposite directions from each other to get the resulting vector.

Where vector B is in the opposite direction to vector A and R is the resulting vector. The resulting vector is defined as a single vector that produces the same effect as many vectors produced together. The size of a vector is the length of the vector. The absolute value of vector a is represented by |a|. For more information on vector sizes, see Vectors overview. The formulas for the sizes of 2D and 3D vectors in terms of coordinates are derived on this page.

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The phrase "like a great curving mirror, infinitely blue and beautiful, always the same" is a poetic description of the sky.

This description compares the sky to a large, curving mirror, highlighting its vastness and ability to reflect light.

The sky's blue color is emphasized as being infinite and beautiful, while "always the same" suggests that it remains constant and unchanging despite the passage of time or changes in weather.

Summary: The given phrase is a poetic way of describing the sky's vastness, beauty, and constancy.

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When a parallel beam of light passes through a convex lens, the rays become farther from one another when the come out. This process of rays is called ''to diverge''. The concave lens makes rays of light diverge, so it is called diverging lens.

Explanation:

A. Up along the page

Using the law of the right hand

Answer:

Batteries are intended to store chemical energy and then it converts into electricidal energy. So overall, batteries produce energy.

Explanation:

Answer:

It is mass

Explanation:

Mass is how much matter is inside an object

Density is how tight the matter is packed

Volume is how much space an object takes up.