A student carries a backpack for one mile. Another student carries the same backpack for two miles

Compared to the first student, how much work did the second student do?

Option C. The heat absorbed or lost by a substance while it's changing state  correctly describes latent heat

Latent heat is the heat absorbed or lost by a substance while it is changing state.

The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.

For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.

Latent heat is not associated with a temperature change; rather, it's associated with a change of state.

For instance, the temperature of water remains at 100°C while boiling.

When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.

When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.

Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.

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No Solution:

4x+10y = 40

2x + 5y = 40

2x - 8y=17

x - 4y = 7

One Solution:

2y - X= 12

2y - 2x =10

x + 10y =50

2x + 10y =90

Infinitely Many Solutions:

x + 2y = 1

3x + 6y= 3

2y - 3x = 5

2/5y -3/5x =1

Explanation: You only had 11 equations listed. But I believe these are the ones you want. I took the test and got them right. Hope it helps

Answer:

they release energy  

Explanation:

An earthquake is the abrupt release of energy from the earth's crust that causes the earth's surface to shake . Thus , seismic waves are produced. The kind and severity of an earthquake are based on the local seismic activity . therefore the correct answer is option A.

The Equator is an imaginary line passing through the middle of a globe. It is equidistant from the North Pole and the South Pole, Its is a horizontal line residing at 0 degrees latitude .

An earthquake is the abrupt release of energy from the earth's crust that causes the earth's surface to shake . Thus, seismic waves are produced. The kind and severity of an earthquake are based on the local seismic activity .

Thus, the correct answer is option A .  

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Answer:

Total distance traveled by the sound wave = 2d . Thus we can conclude that the cliff should be at a distance of 877.15 metres from the source of sound to meet the required conditions

Explanation:

this is what i found on the web

Answer:

1.  Energy

2. All of the above

3. Store and use

4.  Kinetic

5. mass and velocity

6. Potential

7. mass, height, and gravity

8. Chemical Potential

9. Elastic Potential

10.  (`⌒*)O-(`⌒´Q)

Explanation:

Answer:

A, AND B,

Explanation: just trust me bro

Answer:

A. The rays can change molecules and atoms in the body into ions.

If you wanted the laser to refract less as it exits the prism, you should increase the wavelength of the light.

Refraction can be defined as a phenomenon which describes a change (bend) in the path taken by light when it's at surfaces between different transparent materials.

According to the model of light wave, the refraction of light is inversely proportional to its wave. Thus, you should increase the wavelength of light, if you want the laser to refract less as it exits the prism.

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The time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

An echo is a repetition or reflection of a sound or signal. It can be caused by sound waves bouncing off a surface, signal interference, or the repetition of a message in communication.

The speed of sound in air at room temperature is approximately 343 meters per second. When a person claps, the sound waves propagate outward in all directions and reach the school building, where they bounce off and return to the person as an echo. The time it takes for the sound to travel the distance to the building and back to the person is the time interval between the clap and the echo.

To calculate the time interval, we can use the following formula:

time = distance / speed

where distance is the total distance traveled by the sound (twice the distance from the person to the school building), and speed is the speed of sound in air.

distance = 2 x 300m = 600m

speed = 343 m/s

time = 600m / 343 m/s = 1.75 seconds (rounded to two decimal places)

Therefore, the time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

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50 miles in 120 minutes

= 5 miles in 12 minutes

= 5/12 miles in 1 minutes

= 300/12 miles in an hour

= 25 mph

Answer:

Explanation:

We know that:

Work:

Hence, the speed is 25 m/h.

Answer:  If the woodpecker drums upon a tree 5 times in one second, then the frequency is 5 Hz; each drum must endure for one-fifth a second, so the period is 0.2 s.

Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{6}{3} \\ = 2\)

We have the final answer as

Hope this helps you

Answer:

The Correct Answer Is b.

Answer:

The characteristics that determine how easily two substances change temperature are:

The volume and density of the substances and the amount of time they are in contact do not directly affect how easily they change temperature.

Explanation:

Answer:

If he's 500 kg and 1 kg = 10 N then it would be 5,000 N

Explanation:

The surface area is unimportant and they'll use it to trick you.

It is possible that students may have misunderstood the information taught by Ms. Kontos about human vision due to various factors such as prior knowledge, attention, motivation, and the way the information was presented.

To improve on this lesson and help students gain a more accurate understanding of human vision, two strategies based on contemporary principles and theories of learning and cognition are:

Incorporating visual aids and hands-on activities: By using visual aids such as diagrams, videos, and animations, students can better understand the complex processes involved in human vision. Hands-on activities such as creating simple models or simulations of the eye can also help students connect what they have learned to real-life situations.

Encouraging metacognition: Encouraging students to think about their own thinking processes, or metacognition, can help them understand their own learning style and identify areas where they need further clarification. By encouraging students to ask questions, discuss what they have learned, and reflect on their own understanding, they can build a more accurate understanding of the topic.

These strategies can help students gain a deeper and more accurate understanding of human vision and improve their learning outcomes.

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Scientists seek to acquire knowledge and understanding of the real world through the formulation, testing, and evaluation of scientific hypotheses (Option C).

Scientific hypotheses are explanations about questions of the real world that can be used to test them by using the scientific method, i.e., by testing them to confirm or reject their assumptions through experimental and observation procedures.

Therefore, with this data, we can see that a scientific hypothesis is formulated and tested by using the scientific method in order to confirm or reject its assumptions and thus build scientific knowledge.

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Answer:

Scientific hypothesis

Explanation:

Answer:

Forwarded

Explanation:

This question can be easily solved by using the law of conservation of energy.

The work done by the friction is "9.9 J".

The law of conservation of energy applied to this condition gives the following equation:

\(Potential\ Energy\ Lost\ by\ Block = Energy\ Stored\ by\ Spring\ +\ Work\ done\ by\ friction\\\\mgh = \frac{1}{2}kx^2\ +\ W\)where,

W = Work done by friction = ?

m = mass of the block = 4.8 kg

g = acceleration due to gravity = 9.81 m/s²

h = height = 0.52 m

k = spring constant = 2000 N/m

x = compression distance = 12.1 cm = 0.121 m

Therefore,

\((4.8\ kg)(9.81\ m/s^2)(0.52\ m)=\frac{1}{2}(2000\ N/m)(0.121\ m)^2+W\\W = 24.5\ J - 14.6\ J\)

W = 9.9 J

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The attached picture explains the law of conservation of energy.

The gravitational potential energy (PE) of an object can be calculated using the formula:

PE = mgh

Where:

PE is the gravitational potential energy

m is the mass of the object

g is the acceleration due to gravity

h is the height or distance above the reference point (usually the ground)

In this case, you provided the weight of the object, which is 24 N. The weight of an object is the force due to gravity acting on it, and it can be calculated using the formula:

Weight = mg

Where:

Weight is the force due to gravity

m is the mass of the object

g is the acceleration due to gravity

Since you haven't provided the mass of the object, we can find it by rearranging the weight formula:

m = Weight / g

Now, we can calculate the mass of the object:

m = 24 N / 9.8 m/s² ≈ 2.45 kg

Now we have the mass (m = 2.45 kg), the height (h = 3.2 m), and the acceleration due to gravity (g ≈ 9.8 m/s²). Plugging these values into the formula for gravitational potential energy:

PE = mgh

= 2.45 kg × 9.8 m/s² × 3.2 m

≈ 76.736 J

Therefore, the gravitational potential energy of the object at a height of 3.2 m from the ground is approximately 76.736 joules (J).

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Answer:

The first law, also called the law of inertia, was pioneered by Galileo. This was quite a conceptual leap because it was not possible in Galileo's time to observe a moving object without at least some frictional forces dragging against the motion. In fact, for over a thousand years before Galileo, educated individuals believed Aristotle's formulation that, wherever there is motion, there is an external force producing that motion.

The second law, $ f(t)=m\,a(t)$ , actually implies the first law, since when $ f(t)=0$ (no applied force), the acceleration $ a(t)$ is zero, implying a constant velocity $ v(t)$ . (The velocity is simply the integral with respect to time of $ a(t)={\dot v}(t)$ .)

Newton's third law implies conservation of momentum [138]. It can also be seen as following from the second law: When one object ``pushes'' a second object at some (massless) point of contact using an applied force, there must be an equal and opposite force from the second object that cancels the applied force. Otherwise, there would be a nonzero net force on a massless point which, by the second law, would accelerate the point of contact by an infinite amount.

Explanation:

Answer:

I honestly have no clue so yeah

Answer:

If you mean the same graph as the other question with the same name  then the answer would be constant

Explanation:

If you look at said graph the time and the position move at a constant rate

Answer:

I hope it will help you....

I dont know but I am messaging because maybe someone else see it and help u :)

The nucleons have less mass, because matter is converted into binding energy. Option D is correct.

During the process of combining a neutron and a proton to form a nucleus, a small amount of mass is converted into binding energy. This is due to the strong nuclear force that holds the nucleus together. The mass of the nucleus is slightly less than the sum of the masses of the individual nucleons, and the difference in mass is referred to as the mass defect.

This mass defect is related to the binding energy of the nucleus through Einstein's famous equation E=mc², where E is energy, m is mass, and c is the speed of light. The mass defect represents the amount of mass that is converted into binding energy to hold the nucleus together. Option D is correct.

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Answer:

D. Push Factor

Explanation:

Weather hazards and natural disasters are horrendously negative things that people actively seek to avoid; they make people want to leave or depart from an area in order to escape them. As such, they are considered push factors.

(Weather hazards and natural disasters are not pull factors because when discussing push vs pull we are specifically describing the mentioned factor. This aspect is not considered both because the migration factor mentioned in this question actively makes people want to move to any area that avoids their issue. Remember that pull factors make people want to move to a specific place for a unique advantage, while push factors make people want to move to any general place for a common advantage.)

The change in friction force experienced by the car is

The friction is caused between two uneven contacting surfaces.

When car is on ice, the friction force is

f = μ N

f₁ = 0.2 x 14500 = 2900N

When the car is on dry road, the friction force is

f₂ = 0.8 x 14500 =11,600 N

The change in friction force =11600 - 2900 = 8700N

Thus, the change in friction force experienced by the car is  8700N.

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The engine in a small airplane is specified to have a torque of 500 N⋅m. This engine drives a 2.3-m-long, 40 kg single-blade propeller.The engine in a small airplane is specified to have a torque of 500 N⋅m. it takes approximately 18.6 seconds for the propeller to reach 2000 rpm.

To determine how long it takes the propeller to reach 2000 rpm, we need to use the torque equation:

T = Iα

where T is the torque, I is the moment of inertia, and α is the angular acceleration.

We can rearrange this equation to solve for α:

α = T/I

where T is the torque and I is the moment of inertia.

The moment of inertia of a thin rod about its center of mass is given by:

I = (1/12)M\(L^2\)

where M is the mass of the rod (propeller) and L is its length.

In this case, M = 40 kg and L = 2.3 m. Therefore:

I = (1/12)(40 kg)(\(2.3 m)^2\)= 44.33 kg⋅\(m^2\)

The torque T is given as 500 N⋅m.

Substituting the values in the equation for α, we get:

α = T/I = (500 N⋅m) / (44.33 kg⋅\(m^2\)) = 11.27 rad/\(s^2\)

We need to find the time it takes for the propeller to reach 2000 rpm, which is equivalent to 209.44 rad/s. We can use the following kinematic equation to find the time t:

ω = ω0 + αt

where ω0 is the initial angular velocity, which is zero in this case.

Substituting the values, we get:

209.44 rad/s = 0 + (11.27 rad/\(s^2\)) t

Solving for t, we get:

t = 18.6 seconds (rounded to one decimal place)

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