Acceleration - The fastest serve in history

Answer:

39,200J

Explanation:

just took the test

The meteor's potential energy if it has a mass of 10kg at an altitude of 400 m will be 39200 J

Potential Energy that depend upon the relative position of various parts of system . It is an energy possessed by an object by virtue of its position or configuration.

mass(m)  = 10kg

g (acceleration due to gravity) = 9.8m/s^2

altitude(height (h)) = 400m

Meteor's Potential energy = m * g * h

                                           = 10 * 9.8 * 400 = 39200 J

correct option will be a) 39200 J

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1. The kinetic energy of the bottle is 1 Kg.m²/s²

2. The kinetic energy of the bottle is 2 Kg.m²/s²

3. The kinetic energy of the bottle is 3 Kg.m²/s²

4. The kinetic energy of the bottle is 40 Kg.m²/s²

The kinetic energy can be obtain as illustrated below:

1. For mass 0.125 Kg

KE = ½mv²

KE = ½ × 0.125 × 4²

Kinetic energy = 1 Kg.m²/s²

2. For mass 0.250 Kg

KE = ½mv²

KE = ½ × 0.250 × 4²

Kinetic energy = 2 Kg.m²/s²

3. For mass 0.375 Kg

KE = ½mv²

KE = ½ × 0.375 × 4²

Kinetic energy = 3 Kg.m²/s²

4. For mass 0.500 Kg

KE = ½mv²

KE = ½ × 0.500 × 4²

Kinetic energy = 40 Kg.m²/s²

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The change in kinetic energies are 1 \(kg m^{2}/s^{2}\), 2 \(kg m^{2}/s^{2}\), 3 \(kg m^{2}/s^{2}\), and 4 \(kg m^{2}/s^{2}\) respectively as the mass of the bottle is changed as 0.125kg,  0.250kg, 0.375kg, and 0.500kg.

Given the velocity v=4m/s.

KE=\(1/2 mv^{2}\)
Here KE represents the Kinetic energy of the bottle, m represents the mass of the bottle which is varying time to time, and v represents the velocity of the bottle which is constant over time.
For the first case:
Given mass m=0.125kg
∴KE=\(1/2mv^{2}\)
     =1/2*(0.125)*(4)²
     =1 \(kg m^{2}/s^{2}\)
Hence the change in kinetic energy of the bottle when it became 0.125kg is 1 kg m²/s².

For the second case:
Given mass m=0.250kg
∴KE=\(1/2mv^{2}\)
     =1/2*(0.250)*(4)²
     =2 \(kg m^{2}/s^{2}\)
Hence the change in kinetic energy of the bottle when it became 0.250kg is 2 kg m²/s².

For the third case:
Given mass m=0.375kg
∴KE=\(1/2mv^{2}\)
     =1/2*(0.375)*(4)²
     =3 \(kg m^{2}/s^{2}\)
Hence the change in kinetic energy of the bottle when it became 0.375kg is 3 kg m²/s².

For the final case:
Given mass m=0.500kg
∴KE=\(1/2mv^{2}\)
     =1/2*(0.500)*(4)²
    =4 \(kg m^{2}/s^{2}\)
Hence the change in kinetic energy of the bottle when it became 0.500kg is 4 kg m²/s².

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Answer:

Newton's Third Law

His third law states that for every action (force) in nature there is an equal and opposite reaction

Explanation:

Answer:

The estimated braking force needed to stop the lorry is zero, based on the given information and calculations. However, it's important to note that this result is likely not accurate, as some force is required to stop a moving object. It's possible that additional information or calculations are needed to obtain a more realistic estimate of the braking force.

Explanation:

To estimate the braking force needed to stop the lorry, we can use Newton's second law of motion, which states that force (F) is equal to mass (m) multiplied by acceleration (a).

In this case, the lorry decelerates uniformly, so the acceleration is constant. The initial velocity is assumed to be zero since the lorry comes to a stop. The final velocity is also zero. Therefore, we can use the equation:

Final velocity squared (vf^2) = Initial velocity squared (vi^2) + 2 * acceleration (a) * distance (d)

Since vi = 0 and vf = 0, the equation simplifies to:

0 = 0 + 2 * a * d

Solving for acceleration (a), we have:

2 * a * d = 0

a = 0

Since the acceleration is zero, it means that the braking force needed to stop the lorry is also zero. This is likely not an accurate result as some force is required to stop the lorry. It's possible that additional information or calculations are needed to accurately estimate the braking force.

The braking force required to stop a 6371 kg lorry after spotting a hazard and applying the brakes is what the question is asking for. The lorry decelerates uniformly and comes to a stop 60 meters after the brakes are applied.

The following steps will guide you on how to calculate the braking force:

Step 1: Determine the mass of the lorry which is 6371 kg. This will be denoted as m.

Step 2: Determine the distance travelled by the lorry, which is 60 m.

Step 3: Determine the time taken by the lorry to stop. This can be done by using the formula for uniform deceleration, which is a = (v-u)/t where v is the final velocity, u is the initial velocity and a is the uniform deceleration. Since the lorry comes to a stop, its final velocity is zero and its initial velocity is unknown.

However, we can assume that the lorry was initially travelling at a constant speed before spotting the hazard. Therefore, we can assume that the initial velocity was equal to the average velocity of the lorry before the brakes were applied.

This can be calculated using the formula v = d/t where d is the distance travelled and t is the time taken. The average velocity can therefore be calculated as follows: v = d/t = 60 m/t

Step 4: Rearrange the formula for uniform deceleration, a = (v-u)/t, to find u which is the initial velocity. Since the lorry comes to a stop, we know that v = 0.

Therefore: u = v - at where a is the uniform deceleration and t is the time taken to stop which is also equal to the time taken for the lorry to travel the distance of 60 meters. Substituting for v, we get: u = - at

Step 5: Calculate the acceleration of the lorry using the formula a = (v-u)/t. Since the final velocity is zero, we get: a = -u/t = -(-at)/t = a The acceleration is negative since the lorry is decelerating.

Step 6: Calculate the braking force using the formula F = ma where F is the braking force and m is the mass of the lorry. Therefore: F = ma = (-ma) since a is negative = (-6371 kg) (a) Therefore, the braking force required to stop the lorry is -6371a N where a is the uniform deceleration calculated in Step 5.

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Answer:

i & 2

Explanation:

U alr finished it so there's no point

50 g more potassium nitrate must be added to make the solution saturated at 70 °C.

Solubility:

It is the degree of dissolved substance at room temperature or 25 °C per  \(\bold {g/100\ cm^3}\).

Saturation:

If no more solute or solid substance is dissolved in the solution, then the solution is called saturated.

Saturation increase with the increase in temperature because the kinetic energy of the particles is increased.

Therefore, 50 g more potassium nitrate must be added to make the solution saturated at 70 °C.

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Answer: It would take 2.3 billion years for the biological reaction without the presence of enzymes. It’s because, without them, your body can’t break down foods so that nutrients can be fully absorbed. Every organ, every tissue, and every 100 trillion cells in our body rely upon the reaction of metabolic enzymes and their energy component.

Explanation:

I hope this helps

There's no answer, because there's no question.

It's very highly possible for lightning to strike the same place twice. Or ten times, or a hundred times, or more. Very likely. It happens every day.

Unless the place burns to the ground. Then, it's not too likely that lightning will hit it again after that. But it's still not impossible.

The faster an object is going, the more resistance there will be. An example of this would be if you're running the faster you run, the more air is going against you.

I hope this helps!

Bacteria and microorganisms in the soil could contribute to the supporting ecosystem service by providing nutrients to the soil. On the other hand, bees in the Earth ecosystem provide a regulating service but this might not be possible on Mars.

This is defined as the type of benefit humans obtain from different elements in the ecosystem. There are four main types of ecosystem services:

Considering in Mars conditions are quite rough, not all organisms might survive but one type of organism that could do it is bacteria.

Bacteria would provide the supporting service in soil because bacteria recycle soil nutrients to support the growth of plants, which is necessary if humans want to live on Mars.

One example of regulating service on Earth is bees. Indeed bees pollinate plants and this is necessary because it helps plants reproduce and thrive, which regulates the number of plants on Earth. Moreover, it is likely bees would not survive on Earth because they need more demanding conditions.

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Answer:

D. acid damage to the esophagus

Explanation:

Bulimia is when you throw up the food you eat, and when you throw up, stomach acid will come up as well, so when you are constantly throwing up there is damage done to your esophagus from all the acid that is coming up.

A symptom of bulimia is b. low blood sugar. Thus The correct option is (B)

Bulimia is an eating disorder in which after unrestrained bout eating episodes, vomiting or diarrhea occurs, including medication use.

Bulimia is a serious eating disorder that can cause serious damage to our health. Bulimia is defined by an episode of excessive food consumption followed by compensatory behavior, due to guilt and fear of weight gain, inducing vomiting and/or diarrhea.

We can conclude that bulimia is a psychological disease that needs better treatment, and this disease results in symptoms like low blood glucose because there is an eating disorder.

Bulimia, also known as bulimia nervosa, is an eating disorder characterized by recurrent episodes of binge eating followed by compensatory behaviors, such as self-induced vomiting, misuse of laxatives or diuretics, fasting, or excessive exercise.

People with bulimia often have a distorted body image and are preoccupied with their weight and shape. They may feel ashamed or guilty about their binge eating episodes and may try to hide their behaviors from others. Bulimia can have serious physical and mental health consequences, including electrolyte imbalances, gastrointestinal problems, dental problems, depression, and anxiety.

Bulimia can be treated with a combination of psychotherapy, medication, and nutritional counseling. Cognitive behavioral therapy (CBT) is a common form of psychotherapy used to treat bulimia, which focuses on changing negative thoughts and behaviors related to food and body image. Antidepressant medication may also be prescribed to help manage underlying depression or anxiety.

Hence A symptom of bulimia is low blood pressure.

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Answer:

Density

Explanation:

Each of the three liquids have different densities. Have you ever tried to mix oil and water? They don't mix because they have different densities.  

Answer: the answer is C

Explanation:

hope it helps friend :)

Answer:

D. The equator is half of a circle used to describe the northern half of the Earth.

Explanation:

hope it helps

Answer: C

Explanation: The equator divides the earth into North and South pole

Answer: (I) goes out

(ii)gets bright

Explanation:

The average speed of the baton can be determined by dividing the total distance travelled by the total time taken for that travelling.

\(Average\ Time = \frac{Total\ Distance}{Total\ Time}\)

First, we will find the total distance, by adding the distances travelled by both Mahiya and Mrinmoy, while carrying the baton.

\(Total\ Distance = Distance\ Travelled\ by\ Mahiya\ to\ pass\ the\ baton\ to\ Mrinmoy\ +\ Distance\ Travelled\ by\ Mrinmoy\ to\ pass\ the\ baton\ to\ Mahiya\ +\ Final\ Distance\ Travelled\ by\\ Mahiya\)Total Distance = 60 m + 120 m + 60 m = 240 m

Now, we will find the total time taken for this travelling. To find out the total time we will divide each distance travelled by the speed of the traveller during that distance:

\(Total\ Time = \frac{60\ m}{6\ m/s}+\frac{120\ m}{4\ m/s}+\frac{60\ m}{3\ m/s}\\\\Total\ Time = 10\ s\ +\ 30\ s\ +\ 20\ s\)

Total Time = 60 s

Now, we finally find the average speed of the baton by using the formula:

\(Average\ Time = \frac{Total\ Distance}{Total\ Time}\\\\Average\ Time = \frac{240\ m}{60\ s}\)

Average Speed = 4 ms⁻¹

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Answer:

Conduction is heat transfer through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know that thermal motion of the atoms and molecules occurs at any temperature above absolute zero.) Heat transferred from the burner of a stove through the bottom of a pan to food in the pan is transferred by conduction.

Convection is the heat transfer by the macroscopic movement of a fluid. This type of transfer takes place in a forced-air furnace and in weather systems, for example.

Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of Earth by the Sun. A less obvious example is thermal radiation from the human body.     I hope this helps you

Explanation:

Answer:

uhh what u have 2 do ?

Explanation:

Answer:

Two of Einstein’s influential ideas introduced in 1905 were the theory of special relativity and the concept of a light quantum, which we now call a photon. Beyond 1905, Einstein went further to suggest that freely propagating electromagnetic waves consisted of photons that are particles of light in the same sense that electrons or other massive particles are particles of matter. A beam of monochromatic light of wavelength \lambda (or equivalently, of frequency f) can be seen either as a classical wave or as a collection of photons that travel in a vacuum with one speed, c (the speed of light), and all carrying the same energy, {E}_{f}=hf. This idea proved useful for explaining the interactions of light with particles of matter.

Answer:

As the _average kinetic___energy of a substance increases the thermal energy of that substance will _increase___raising the _temperature___ of the substance.

Explanation:

Answer: Room temperature

Explanation: it makes sense (sorry if its wrong)

Answer:

A. Large chunks of sodium chloride are placed in a mortar and pestle. The sodium chloride is broken into smaller pieces.

Explanation:

This is an example of physical change where the physical properties of the substance are altered without any formation of a new substance. So, it is not an evidence of a chemical reaction.

Answer:

Explanation:

Friction is a force which opposes the relative motion of two objects in contact.

Answer: The resistance that one surface or object encounters when moving over another

Explanation: The action of one surface or object rubbing against one another.

Example: Sally rubbed the two sticks TOGETHER that is an example of friction.

Answer:

the answer is a

Explanation:

i got it right

Answer:A

Explanation:

Answer:

I'm only answering 10 because I don't have time to do all of this:)

1) Radio

2) Gamma

3) Gamma

4) Radio

5) Radio

6) Ultraviolet

7) Gamma

8) Radio

9) Gamma

10) Ultraviolet

The work input = Fi × di

To solve for work input, you need to know the force acting on an object and the distance it moves in the direction of the force. Work input is defined as the product of force and distance, given by the formula:

Work Input = Force × Distance × cosθ

Where θ is the angle between the force vector and the direction of motion. If the force is applied in the direction of motion, then θ = 0 and cosθ = 1, so the formula simplifies to:

Work Input = Force × Distance

For example, if you are pushing a box with a force of 50 newtons over a distance of 10 meters, the work input would be:

Work Input = 50 N × 10 m × cos(0°) = 500 Joules

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Answer: F i × d i

Explanation: