Select the correct answer. What is energy? A. a change that appears in an object when force is applied B. the property of a body that gives it mass C. the amount of heat produced by a body D. the ability of an object to undergo change E. the ability of a body to move

Answer:

C

Explanation:

Z = 84, A = 218

trust, got a 100 :)

Answer:

About 3.54x1022 N.

Explanation: The gravitational force between the Sun and the Earth is about 3.54x1022 N. This force keeps the Earth orbiting around the Sun. The gravitational force from the other planets does slightly affect the Earth's orbit, but the gravitational pull from the other planets and the Moon is still very small. Sorry if I get this wrong. I am in 5th grade! ♥

A mechanical wave's amplitude, which is a characteristic, tells us how far the midpoint is from the crest either trough.

An movement of matter known as a harmonic oscillator is what is fundamental for the distribution of energy via a medium. The transmission medium sets a restriction on how far a wave can travel. Since sound as well as stream waves being mechanical waves, they must move via a medium.

Matter is made up of vibrating particles that push against one another, creating mechanical waves that travel through the material. How tightly the particles of materials are packed together affects the speed with which an electromagnetic wave moves.

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The average person's vertical jump on the Moon would be 0.65 m.

The gravitational acceleration near the surface of the Moon is 1.62 m/s2, which is about one sixth the gravitational acceleration on Earth.

As a result, an average person's vertical jump on the Moon would be less than on Earth.

To calculate the vertical jump on the Moon, we need to use the formula h = 1/2 x g x t2.

This equation is used to calculate the height h (in meters) that an object will reach when thrown into the air, given the gravitational acceleration g (in m/s2) and the time t (in seconds) it takes to reach the peak of the jump.

Since the gravitational acceleration on the Moon is 1.62 m/s2, and the time taken to reach the peak of the jump is the same (assume 0.5 s), then h = 0.5 x 1.62 x (0.5)2, which is 0.65 m.

Therefore, an average person's vertical jump on the Moon would be 0.65 m.

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The refractive index of the material is 0.

When the ray is incident on a transparent surface at an angle of 360 and the angle of refraction within the material is 27°, the refractive index of the material can be determined. The formula for Snell’s law is used to calculate refractive index. It states that: `sin i / sin r = n where i is the angle of incidence, r is the angle of refraction and n is the refractive index`.Snell’s law can be re-arranged to make n the subject of the formula to be: `n = sin i / sin r`Hence, we can calculate the refractive index as follows:

For the incident ray, i = 360° and the angle of refraction within the material, r = 27°.n = sin i / sin r= sin 360°/ sin 27°= 0/1 (since sin 360° = 0)= 0Therefore, the refractive index of the material is 0. T

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Option D is correct. If you want assistance, any of the ways listed above can assist you in generating pre-questioning ideas.

One way of teaching and understanding comprehension is the pre-questioning technique. Prequestioning concepts can be found in textbooks, professors, and study groups.

Teachers can provide some questions connected to the topic of study for comprehension. Questions can also be obtained through study groups and ideas can be obtained from textbooks of similar disciplines.

Hence Option D is correct.

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The internal conflict in the passage is about how Maggie feels about Dee's arrival. Maggie is feeling insecure about her scars and how Dee will react to her seeing her.

The correct answer to this question is option B.

Maggie is self-conscious of her appearance due to the burns on her skin. Her scars resulted from a house fire in which she was injured while trying to save some family heirloom quilts. On the other hand, Dee is confident and proud of her African heritage.

She changed her name to Wangero, saying that Dee no longer represents her real personality. Dee has also gained a formal education, moved to a big city, and embraced new ideas while rejecting her past, which has left Maggie feeling left behind in rural life.

In conclusion, the passage's internal conflict is Maggie's insecurity about her scars and how her sister Dee will react to seeing her.

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Answer:

The answer Is B.

Explanation:

The cats acceleration is decreased

by air resistance.

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The statements which are correct include the following:

i) Stars like the sun generate energy through nuclear fusion.

ii)The most stable nucleus in terms of binding energy per nucleon is 56fe.

iii) The core of nuclear fission reactors consists of uranium enriched in 235u surrounded by a moderator which slows down the neutrons from the 235u.

This is referred to as the dense part which is present at the center of the atom and it comprises of particles such as proton and neutron. Iron -56 is referred to as the most stable nucleus because it has the lowest mass per nucleon of all nuclides.

Nuclear fusion is the process in which two light nuclei merge to form a single heavier nucleus and energy is generated as a result which is used by stars.

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The efficiency values that is reasonable If you want to design a high efficiency wind turbine is 45%

The efficiency of a wind turbine is the ratio of the power it generates to the power in the wind.

The theoretical maximum efficiency of a wind turbine is the Betz limit, which is 59.3%.

However, in practice, wind turbines are typically only about 35%- 45% efficient.

There are a number of factors that can affect the efficiency of a wind turbine, including the size of the turbine, the wind speed, and the design of the turbine.

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Explanation: Research highlights the individuals with ASDS are nutritionally vulnerable because they exhibit a selective or pick eating pattern and sensory sensitivity that predisposes them to restricted intakes.

I hope this helps!

Answer:

A. A train traveling 60 miles per hour.

Explanation:

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

\( Momentum = mass * velocity \)

This ultimately implies that, the mass of an object or body is directly proportional to its momentum. Thus, the higher the mass of an object or body, the greater would be its momentum and vice-versa.

Hence, a train traveling 60 miles per hour would have the most momentum because it has the greatest mass among the other objects (options).

The correct options for the factors that contribute to the Earth's magnetic field, which protects us from solar wind, are option b. the liquid outer core and option f. the Earth's rotation.

The Earth's magnetic field is generated by the motion of molten iron and nickel in the liquid outer core of the Earth (Option b). This motion, known as convection, generates electric currents that produce the magnetic field.

The Earth's rotation (Option f) also plays a significant role. The rotation of the Earth causes the convection currents in the liquid outer core to circulate and amplify the magnetic field, creating a dynamo effect.

The Earth's revolution (Option a) around the Sun and its tilt on its axis (Option c) are not directly responsible for the generation of the Earth's magnetic field. They are factors that influence climate and seasons on Earth but do not contribute to the magnetic field.

The seasons (Option d) are related to the Earth's axial tilt and its orbit around the Sun but are not directly connected to the generation of the magnetic field.

The solid inner core (Option e) is not involved in generating the Earth's magnetic field. It is mainly composed of solid iron and nickel and does not have the fluid motion required for the generation of a magnetic field.

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Answer:

h = 30.61 m

Explanation:

In this problem they indicate the pressure at the bottom of the lake and the density of the water, for which they must ask what is the depth of the lake.

The pressure is given by the expression

           P = \(P_{atm}\) + rho g h

           P - P_{atm} = rho g h

The gauge pressure value is P- P_{atm} = 3 105 N / m²

          h = \(\frac{P - P_{atm}}{ \rho \ g}\)

let's calculate

          h = \(\frac{3 \ 10^5}{1000 \ 9.8}\)

          h = 30.61 m

Considering the depth and the speed, it would take approximately 2.5 to 3 hours to get to the Titanic from the surface.

The time it takes to get to the Titanic from the surface depends on various factors, such as the depth of the Titanic wreck and the speed of the vessel you are using to reach it. The Titanic is located approximately 12,500 feet (3,800 meters) below the surface of the ocean.

Assuming you are using a submarine or a deep-sea diving vessel, it typically takes around 2.5 to 3 hours to reach a depth of 12,500 feet. This is because these vessels generally have a cruising speed of about 4 to 5 knots (4.6 to 5.8 miles per hour).

Therefore, considering the depth and the speed, it would take approximately 2.5 to 3 hours to get to the Titanic from the surface.

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The approximate angular separation of the sun and the full moon is 180°

The full moon is opposite the sun in the sky, and rises as the sun sets is may be understand as ,the Moon can be seen in the day light  sky at any phase except for the new moon, when it's invisible to us, and full moon, when it's below the horizon during the day. The crescent through quarter phases are high in the sky during the day, but the daytime gibbous phases can be glimpsed only just before the Sun sets

In the crescent  phase, the lit-up part of the Moon increases from 0.1% to 49.9%. is growing, while crescent refers to the curved sickle shape.

The gibbous moon is the phase of moon in that appears more than half lighted but less than full.

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Answer:

The ways to change the total energy are to either make the hill taller to increase it or make the hill lower to decrease the total energy.

Explanation:

The total mechanical energy of a system is the sum of the total kinetic energy and total potential energy.

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An automobile with a mass of 1250 kg accelerates at a rate of 4 m/sec² in the forward direction. What is the net force acting on the automobile?

_________________________________________

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_________________________________________

\(\large{\underline{\underline{\maltese{\orange{\pmb{\sf{ \; To \: Find \; :- }}}}}}}\)

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\(\large{\underline{\underline{ \bigstar{{\pmb{\sf{ \; Concept \: and \: Formula \: Used \; :- }}}}}}}\)

➯ Force is defined as the product of the mass of the body and its acceleration.

\( \bigstar \: \small{ \fbox {\textsf {\textbf{F = ma}}}}\)

Where :

\(\large{\underline{\underline{ \bigstar{{\pmb{\sf{ \; Substituting \: the\: Given\: Values :- }}}}}}}\)

\(⇝ \: \: \small \textsf {\textbf{ F = (1250 × 4) N }}\)

\(⇝ \: \: \small \textsf {\textbf{ F = 5000 N }}\)

\(\large{\underline{\underline{ \bigstar{{\pmb{\sf{ \; Therefore \; :- }}}}}}}\)

❝ The net force acting on the automobile is 5000 N. ❞

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Answer:

Speed of the car after it has moved a distance of 20m is 3.8 m/s

Explanation:

Mass of car is M = 2000 kg

Forces acting on car are:

Force F₁ = 1140 N forward force exerted on drive wheels by the road

Force F₂ = 950 N a resistive force

Distance moved by the car is s = 20m , after starting from rest

Work done, W = F₁ * s - F₂ * s

W = 1140 * 20 - 950 * 20 = 3800J

Assuming kinetic energy conservation is work done

W = KEf - KEi

Where KEf = final kinetic energy

KEi = initial kinetic energy which = 0 (since starting from rest)

Hence, W = 3800J = KEf = 1÷2MV²f  

Vf = final velocity = 2 * 3800 ÷ 2000 = 3.8 (m/s)²

Vf = 3.8 m/s

Speed of the car after it has moved a distance of 20m is 3.8 m/s

Solar thermal and photovoltaic (PV) are two different technologies used to harness energy from the sun. Solar thermal systems use the sun’s rays to heat water or air while PV systems convert sunlight directly into electricity.

Both technologies have similarities and differences, and each can be used in various applications. The most important similarity between solar thermal and photovoltaic systems is that they both use the sun’s energy to produce energy. In both cases, the sun’s rays are converted into usable energy. Solar thermal systems use the sun’s heat to heat water or air, while PV systems use the sun’s light to generate electricity. Both systems are also relatively easy to install and maintain, and require little to no additional energy input.

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Answer:

466J

Explanation:

Given parameters:

Mass of steel  = 1kg  = 1000g

Initial temperature  = 21°C

Final temperature  = 22°C

Unknown:

Amount of heat required for this temperature increase  = ?

Solution:

To solve this problem, we use the expression below:

  So;

Heat absorbed  = mass x specific heat of steel x change in temperature

Specific heat of steel  = 0.466J/g°C  

Therefore;

 Heat absorbed  = 1000 x 0.466 x (22  - 21)  = 466J

Answer:

D

Explanation:

Study habits include, how you prepare for assignments, what questions you ask your teacher, and How you take tests, all of these come under study habits, therefore the correct answer is option D.

The deliberate evidenced based quest and application of information and comprehension of the natural implications for society is what is known as research.

Science is a methodology of discovering more about the world.

People may contribute to the development of new knowledge through science and utilize it to promote their objectives.

A student's study habits include factors like how they approach tasks, questions they ask their professors, and how they prepare for the exam

Thus, the correct answer is option D.

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Answer:

its c. 9km

Explanation:

Because it you add the 4km+5km that gives you a total of 9km

Total internal reflection occurs when a light ray hits a surface with a high refractive index at an angle larger than the critical angle. Thus, light will undergo total internal reflection only when it is refracted from a dense medium to a less dense medium at an angle greater than the critical angle.

The total internal reflection is when light waves are reflected back inside a medium instead of passing through it. The phenomenon occurs when the incident angle is greater than the critical angle that is required for the medium. Total internal reflection happens due to the changing of the speed of light when moving from one medium to another.

When a light ray goes from a more dense medium to a less dense one, it bends away from the normal, which is perpendicular to the surface. If the angle of incidence is too large, the ray never goes into the other medium but instead is reflected off the surface of the denser medium back into the original medium. This is referred to as total internal reflection.

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The magnitude of the gravitational force on mass M is: F = G * (M * m) / (L^2 + d^2)

To find the magnitude of the gravitational force on mass M, we will use Newton's Law of Universal Gravitation. The formula for this is:
F = G * (M * m) / r^2
Where F is the gravitational force, G is the universal constant of gravitation, M and m are the masses of the objects, and r is the distance between their centers.

Given the information in the question, we have:
M = mass of the larger object
m = mass of the smaller object
L = distance between the centers of the two objects in the horizontal direction
d = distance between the centers of the two objects in the vertical direction

We need to find the total distance r between the centers of the objects. To do this, we can use the Pythagorean theorem:
r^2 = L^2 + d^2
Now, we can plug this into our gravitational force formula:
F = G * (M * m) / (L^2 + d^2)

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Answer:

repetitions of a certain exercise

Explanation:

Answer:

all the body parts work together to make your body function properly, so therefore, a lot of other body parts will break down

Answer:B

Explanation:

Because chemical energy fuels your body with energy so without it u wont have enough energy to move.

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As we know, Acceleration is equal to rate of change in velocity ~

that is ~