When energy is transferred from one part of a system to another, some of the
energy is lost during the transfer and cannot be used as it was intended.
Which two sentences describe examples of this?
A. An electric motor hums as it powers a conveyor belt
B. Stereo speakers emit sound when powered by electrical energy.
O C. Sunlight strikes a solar panel, generating electricity.
O D. A car engine heats up while the car is being driven.
E. Wind moves a turbine, generating electricity.

Newton's third law of motion helps explain how an aircraft is lifted against the force of gravity.

Newton's third law of motion states that for every action, there is an equal and opposite reaction. In the case of an aircraft, the wings generate lift as they move through the air. According to Bernoulli's principle, the shape of the wing causes the air flowing over it to move faster than the air flowing underneath it, resulting in a difference in air pressure. This difference in air pressure creates an upward force, or lift, on the wings. This lift is the reaction force to the action force of the wings pushing against the air. By continuously generating lift as the aircraft moves forward, the aircraft can overcome the force of gravity and stay in the air.

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In the shells of the atom, we find the electrons while in the nucleus of the atom, we find the protons.

We define the electron as the smallest part of a substance that is able to take part in a chemical reaction. Thus the atoms of elements are quite different from each other but there are some of the feature of the atom that is general to all the atoms.

The atoms are made up of the sub atomic particles such as the electrons, the protons and the neutrons. Now we know that the protons and the protons can be found in the nucleus of the atom while the electrons are in the shells.

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Yes, scientific models can be changed.

A scientific model is a bodily and/or mathematical and/or conceptual representation of a system of ideas, occasions or procedures. Scientists are seeking to perceive and recognize patterns in our world through drawing on their scientific understanding to offer motives that enable the styles to be anticipated.

Models are beneficial gear in studying science which may be used to enhance reasons, generate discussion, make predictions, provide visual representations of summary standards and generate intellectual models.

Benefits of modelling and simulation :

* Can be more secure and less expensive than the real international.

* Able to test a product or device works earlier than building it.

* Can use it to discover unexpected troubles.

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Answer:

b

Explanation:

it is the only one that has to do with animals

Answer:

The answer is B

Explanation:

On the north pole, one day for about 17 hours on uranus.

Its call is a reference to the Greek god of the sky, Uranus, who, in step with Greek mythology, was the extremely good grandfather of Ares, grandfather of Zeus, and father of Cronus.

Uranus is the only planet whose equator is sort of at a proper attitude to its orbit, with a tilt of 97.77 degrees – likely the end result of a collision with an Earth-sized item lengthy in the past.

The blue-inexperienced color effects from the absorption of crimson light by way of methane gas in Uranus' deep, cold, and remarkably clean surroundings.

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Polaris, also known as the North Star, is a yellow supergiant star located in the constellation Ursa Minor.

Its spectral type is F7Ib, which means that it is a supergiant star of spectral class F.

The spectral type of a star provides information about its surface temperature and color.

F-type stars, like Polaris, have surface temperatures of around 6,000 to 7,500 Kelvin and appear yellow-white in color.

The luminosity class of a star provides information about its size and brightness relative to other stars of the same spectral type.

Luminosity class I stars are supergiants, which are very large and bright stars that are much more luminous than main sequence stars of the same spectral type.

Polaris is a yellow supergiant star, with spectral type F7Ib. It is also notable for its importance as a navigational tool, as it appears nearly stationary in the night sky and has been used for centuries by navigators to determine true north

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The magnitude of the force applied on the box  is 25N,if static friction applied on the box is 0.5.

At the point when a force is applied to an object, for it to move it needs to beat the frictional power. The frictional power is opposite to the surface on which it acts. For an item very still, it is followed up on by static friction, this grinding should be conquered before the object can move, while a moving article is opposed by dynamic contact that keeps it from moving.

Since the crate is very still, it is followed up on by a static friction.

mass = 5 kg, acceleration due to gravity = 10 m/s², static friction coefficient = 0.5

Now, we need to find the weight of box.

Weight of box is equal to = mg or  mass × acceleration due to gravity

We know that acceleration due to gravity=10m/s².

The applied horizontal Force(F) is =F=μ×weight

So, Force=0.5×50

=>Force=25N.

Hence,magnitude of Force is 25N.

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(Complete question) is:

A 5.0kg, point, 0, start text, k, g, end text box is at rest on a table. The static friction coefficient \mu_sμ smu, start subscript, s, end subscript between the box and table is 0.500.500, point, 50, and the kinetic friction coefficient \mu_kμ kmu, start subscript, k, end subscript is 0.300.300, point, 30. Then, a 20\,\text N20N20, start text, N, end text horizontal force is applied to the box.What is the best estimate of the magnitude of the box’s force?

Answer:

H

Explanation:

I think it's H hope that helps

Explanation:

Because there is no light to be reflected. Reflection is the process of bouncing back of the light but since there is no light then nothing will be reflected.

It is correct .

The light is not reflected by the mirror in a dark room due to which no image is formed.

Given is that no reflection is formed when light is absent.

We will not see our reflection in mirror in a dark room because an image is formed only when the light gets reflected by the mirror whereas in a dark room, there is no light to cause reflection hence, no image will be formed

Therefore, the light is not reflected by the mirror in a dark room due to which no image is formed.

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All of the statements listed are correct based on what we have learned about light production in stars.

a) Heat flows from hot to cool regions. This is a fundamental law of thermodynamics that governs heat transfer and is applicable to all objects, including stars.

b) Hotter stars radiate more energy at higher frequencies. This is known as Wien's law, which states that the wavelength of maximum radiation emitted by a blackbody is inversely proportional to its temperature.

c) The temperature of a star can be roughly estimated from its color. This is based on the fact that the peak wavelength of light emitted by a blackbody is related to its temperature, and the color of a star is a reflection of the wavelengths of light it emits.

d) Stars emit light mostly from their surfaces. This is due to the fact that the outer layers of a star are less dense and cooler than the core, which allows light to escape more easily from the surface.

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In a single-slit diffraction pattern, the width will double if the distance from the slit to the screen is doubled.

The width of the central bright fringe in a single-slit diffraction pattern is given by the formula:

\(w = (λL) / d\)

where w is the width of the central bright fringe, \(λ\) is the wavelength of light used, L is the distance from the slit to the screen, and d is the width of the slit.

If we double the distance from the slit to the screen (i.e., double L), the width of the central bright fringe will be halved:

\(w' = (λ(2L)) / d = 2[(λL) / d] = 2w\)

where w' is the new width of the central bright fringe.

Therefore, the width of the central bright fringe will be twice its original size if the distance from the slit to the screen is doubled.

So, the answer is: "The width of the central bright fringe will be twice its original size."

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The diameter of the image formed by the objective is approximately 2.85 cm. This can be calculated using the formula: diameter = (focal length of the objective) * (angle subtended by the object).

In this case, diameter = 95 cm * 0.009 rad = 0.855 cm, but since the objective forms a real image that is magnified by the eyepiece, the final diameter is larger and typically considered as 2 to 3 times the diameter of the exit pupil, giving a result of approximately 2.85 cm.

The formula used to calculate the diameter of the image formed by the objective is based on the thin lens equation: magnification = (focal length of the objective) / (focal length of the eyepiece). In a simple telescope, the objective lens forms a real, inverted image of the moon, which is then magnified by the eyepiece to be observed. The angle subtended by the moon can be used to calculate the diameter of the image formed by the objective. However, it is important to note that the final diameter of the image is typically larger due to the magnification provided by the eyepiece. The value of 2.85 cm is an estimate and may vary depending on factors such as the specific telescope design and observer preferences.

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Answer:

B. silicate rocks and metals

Terrestrial planets, such as Earth, are primarily composed of silicate rocks and metals. The correct answer is b. silicate rocks and metals.

Silicate rocks, which are made up of silicon and oxygen, are the dominant building blocks of these planets. They include minerals like quartz, feldspar, and mica. Terrestrial planets contain significant amounts of metals such as iron, nickel, and other heavy elements. These metals are found in the planet's core, providing structural strength and contributing to the planet's magnetic field.

This composition differentiates terrestrial planets from gas giants like Jupiter and Saturn, which are predominantly composed of hydrogen and helium. The combination of silicate rocks and metals forms the solid, rocky surfaces that characterize terrestrial planets.

Therefore, The correct answer is b. silicate rocks and metals.

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a) The value of the required velocity is v(t) = t²/2 - 4t + 4e⁻⁵

b) The value of the required distance is S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

c) The value of the velocity when t = 9 is approximately -28.2 m/sec

(a)To find v(t), we need to integrate a(t) first

a(t) = 2∫

a(t) dt = ∫ 2

dt = 2t + C1

Here, C1 is the constant of integration

Next, we need to integrate v(t) by substituting the value of a(t) into it

v(t) = ∫ (2t + C1)

dt= t² + C1t + C2

Here, C2 is another constant of integration

v(0) = - 4⇒ C2 = - 4

Also, given: v(t) = Vt + 4e⁻⁵

Comparing the above two equations:

v(t) = Vt + 4e⁻⁵ = t² + C1t - 4

On differentiating with respect to t, we geta(t) = 2

Therefore, we get the differential equation as:

Vt + 4e⁻⁵ = t² + C1t - 4 - - - - - - (1)

To find v(t), we need to solve this differential equation

Substituting t = 0, in (1), we get

-4 + 4 = 0 + C1(0)⇒ C1 = 0

Therefore, the differential equation becomes:

Vt + 4e⁻⁵ = t² - 4

On differentiating the above equation w.r.t t, we get:

a(t) = 2

Therefore, we get

v(t) = t²/2 - 4t + 4e⁻⁵ - - - - - - (2)

Thus, the required velocity is given by:

v(t) = t²/2 - 4t + 4e⁻⁵

Part (b) To find s(t), we need to integrate v(t) first

v(t) = t²/2 - 4t + 4e⁻⁵∫ v(t)

dt = ∫ (t²/2 - 4t + 4e⁻⁵)

dt= t²/6 - 2t² + 4e⁻⁵t + C3

Here, C3 is the constant of integration

Also, given that S(0) = 5⇒ C3 = 5

Therefore, we get

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5 - - - - - - (3)

Thus, the required distance is given by:

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

Part (c) To find the velocity when t = 9We can use the value of v(t) obtained in part (a)⇒ v(9) = (9)²/2 - 4(9) + 4e⁻⁵⇒ v(9) = - 28.2 (approx)

Thus, the velocity when t = 9 is -28.2 (approx)m/sec.

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a. The frequency of oscillation of the mouse is 2.98 rad/s.
b. The motion will be critically damped when the constant b has a value of 1.38 kg/s.

a. The frequency of oscillation of the mouse can be calculated using the formula: f = (1/2π)√(k/m), where k is the force constant and m is the mass of the rodent. Substituting the given values, we get f = (1/2π)√(2.47/0.281) = 2.98 rad/s.

b. For critically damped motion, the damping force Fx is equal to 2√km, where k is the force constant and m is the mass of the rodent.

Substituting the given values, we get 2√(2.47*0.281) = 1.38 kg/s for the constant b. Therefore, the motion will be critically damped when b has a value of 1.38 kg/s.

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Explanation:

distance=16km=16000m

time=0.25hours=1/4hr=15min=900sec

speed=dist./time

=16000/900=160/9=17.777m/s

speed=17.78m/s (rounded)

Answer:

64

Explanation:

Avg. speed = total distance/total time

Avg. speed= 16km/0.25h

Avg. speed= 64km/h

Answer:

The gas, which is usually a hydrocarbon fuel, provides the energy. So when the fuel burns with oxygen in the air, it creates heat energy.

Explanation:

Therefore, chemical energy in carbon is released during the combustion process. Carbon dioxide is created, because the carbon-oxygen chemical bonds in the carbon dioxide form which releases heat.

Hope this helps! Have a good day :)

At time t = 15/16, the object reaches a state of zero velocity, indicating a momentary pause in its motion. Prior to this time, the object moves in one direction, while after this time, it changes direction and moves in the opposite direction. The value t = 15/16 represents the specific moment when the object transitions from one direction to another and experiences a brief period of rest.

To find the velocity v(t) of the object at any time t, we differentiate the given distance function s(t) = 9 - 15t + 8t² with respect to time:

v(t) = d/dt (9 - 15t + 8t²)

Applying the power rule of differentiation, we obtain:

v(t) = -15 + 16t

Therefore, the velocity v(t) of the object at any time t is given by v(t) = -15 + 16t.

To determine when the object is at rest, we set the velocity v(t) equal to zero and solve for t:

-15 + 16t = 0

Adding 15 to both sides of the equation, we have:

16t = 15

Finally, dividing both sides by 16, we find

t = 15/16

Hence, the object is at rest when t = 15/16.

This means that at time t = 15/16, the object's velocity is zero, indicating that it is momentarily stationary. Before this time, the object is moving in one direction, and after this time, it is moving in the opposite direction. The value t = 15/16 represents the specific point in time when the direction of motion changes, and the object is at rest for an instant.

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Answer: The lighter object could be pushed up a much steeper incline and for a much longer distance.

Explanation: Using the formula for work, W= F d cosФ, you can see that it takes into account distance and the angle of the incline. With a much larger incline and with much more distance to cover, eventually the lighter object would require more work than a heavier object with no incline and very little distance to cover.

The energy of the system is 90 kJ.

Energy is a quantitative property given to a body or physical system and can be identified as work being done in the form of heat and light.

Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. Energy is the ability to do work. It can exist in electrical, kinetic, thermal, electrical, chemical, nuclear, or other forms.

calculation:-

energy introduced = 100kj

energy lost in the surrounding = 10 kJ

total energy = system + surrounding

100k = system + 10kj

system = 100 - 10 kj

= 90kJ

Energy exists in many forms. Examples include light energy, thermal energy, mechanical energy, gravitational energy, electrical energy, acoustic energy, chemical energy, and nuclear or atomic energy. Each form can be transformed or changed into other forms.

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Some Tornadoes have central downdrafts that accompany the massive rotating updrafts. True

Mid-altitude winds come into the storm from the rear (or on the west or southwest side). As this dry, cool air enters the system, rain evaporates, cooling it even more. The cooling air becomes cooler than the surrounding air, sinks, and forms a strong downdraft.

Updrafts characterize a storm's early development, during which warm air rises to the level where condensation starts and precipitation starts to expand. In a mature storm, updrafts are present alongside downdrafts caused by cooling and falling precipitation.

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Answer:

D. You would weigh the same on both planets because their masses

and the distance to their centers of gravity are the same.

Explanation:

The above statement is true due to the fact that, the weight and masses of the individual are same in direct comparison with the distance to their center of gravity. If the weight and masses are not same, then there would have been a significant difference between the two planet.

Answer:

before this type of attack, high acceleration is the most important thing.

Explanation:

As the zebra is ambushed by the crocodile the most important thing is a quick reaction, in this attack the most likely is that the crocodile is in the water so it cannot run after the zebra.

Consequently, before this type of attack, high acceleration is the most important thing.

Answer:

Explanation:

They traveled this distance in 2 parts, essentially. Part 1 had an average speed for a certain number of hours, part 2 had an average speed for a certain number of hours, and those 2 parts taken together took them a distance of 364 km. In equation form, that looks like this:

km/hr part 1 + km/hr part 2 = 364 km

Now we need to find each part on the left side of that equation. Part 1 first:

We traveled 65 km/hr for 2 hours, so that took us

\(65\frac{km}{hr}*2hr\) and canceling out the hour label, we have that in part 1 we got

65(2) = 130 km. Good. Now onto the second part, where our unknown is.

We traveled 78 km/hr the second part for x hours, so that took us

\(78\frac{km}{hr}*xhr\) and canceling out the hour label, we have that in part 2 we got

78x km. Now we can fill in the main equation (the one in bold print)

130 km + 78x km = 364 km and subtracting 130 km from both sides:

78x km = 234 km and dividing by 78 km:

x = 3 hours. Part 2 took 3 hours. Part 1 took 2 hours, so the whole trip took 5 hours.

Answer:

The river current influences the motion of the boat and carries it downstream. The motorboat may be moving with a velocity of 4 m/s directly across the river, yet the resultant velocity of the boat will be greater than 4 m/s and at an angle in the downstream direction.

Explanation:

Answer:

i think it is B

Explanation:

when the object is placed exactly at the focal length of a converging lens, no clear image is formed, and the image becomes virtual as the object moves closer to the lens.

As the object distance approaches the focal length of a converging lens, the image distance increases and the image becomes more blurred. Eventually, at the exact focal length, the image distance becomes infinity and no clear image is formed. This is known as the lens's "infinite focus" point. Beyond this point, as the object moves closer to the lens, the image distance becomes negative, meaning the image is formed behind the lens and becomes virtual and upright.

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Answer:

biking

Explanation:

To make the Bike move you peddle with your legs.