100
10.
A wooden bar is pivoted at its centre so that it can rotate freely. Two equal forces F are applied to
the bar
in which diagram is the turning effect greatest?
pivot.
pivot.

According to Newton's law of cooling, The formula that models the cooling of the turkey is T(t) = (165 - 75) * e^(k * t) + 75. The temperature of the turkey 50 minutes after it leaves the oven will be approximately 118°F.

(a) The formula that models the cooling of the turkey is T(t) = (165 - 75) * e^(k * t) + 75.

In this case, the temperature difference between the turkey and the room, when it came out of the oven, is A = 165 - 75 = 90°F, and Ts (the temperature of the room) is 75°F. By substituting these values into the equation T(t) = A * e^(k * t) + Ts, we get T(t) = 90 * e^(k * t) + 75.

To find the value of k, we can use the information that when t = 30 minutes, T(30) = 145°F. Substituting these values into the equation and solving for k, we have 145 = 90 * e^(k * 30) + 75. Rearranging and solving, we find k ≈ -0.0207.

(b) The temperature of the turkey 50 minutes after it leaves the oven will be approximately 118°F.

To calculate the temperature at t = 50 minutes, we can use the formula T(t) = 90 * e^(-0.0207 * t) + 75. Substituting t = 50, we have T(50) = 90 * e^(-0.0207 * 50) + 75. Evaluating this expression, we find T(50) ≈ 118°F.

(c) It will take approximately 145 minutes for the turkey to cool to 110°F.

To determine the time it takes for the turkey to reach a temperature of 110°F, we can rearrange the equation T(t) = 90 * e^(-0.0207 * t) + 75 and solve for t. So, 110 = 90 * e^(-0.0207 * t) + 75. Solving this equation, we find t ≈ 145 minutes.

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The magnitude of the electric field at a distance of 1 m is 7.33 x 10^7 N/C and direction of the electric field is from the positive charge to the negative charge.

The magnitude of the electric field at a distance of 1 m from the center of the dipole is given by:

E = k(2q)/r^2

where k is the Coulomb constant (8.99 x 10^9 Nm^2/C^2), q is the charge of each charge (2nc and -2nc), and r is the distance between the charges (1.5 cm).

E = (8.99 x 10^9 Nm^2/C^2)(2 x 2nc)/(0.015 m)^2

E = 7.33 x 10^7 N/C

The direction of the electric field is from the positive charge to the negative charge.

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In the context of physics, work is defined to be the movement of an object when you apply a (pushing or pulling) force.

If you lifted a box to move it upward, then you are doing work. If you slide that box along the floor, then you are also doing work. However, if you try to lift something very heavy, but cannot move it at all, then 0 work is being applied. This is because the object hasn't moved. You need displacement to have work happen.

So that's why a physicist would not consider studying doing "work" (in the context of physics), though I'm sure they would be able to agree that studying does exercise the mind.

The pattern produced by monochromatic light passing through two parallel slits in a screen and falling on a piece of film is an example of interference pattern. This pattern is a result of the superposition of two waves of the same wavelength and amplitude that originate from the two slits.

As the waves pass through the slits, they diffract and spread out, forming circular waves. These circular waves then overlap and interfere with each other, resulting in areas of constructive interference where the waves reinforce each other and areas of destructive interference where the waves cancel each other out. This interference pattern is a characteristic feature of waves, and it is commonly observed in various fields such as optics, acoustics, and quantum mechanics.

This phenomenon is a result of the wave nature of light and is specifically called Young's double-slit experiment. The interference pattern consists of alternating bright and dark bands, which are called fringes, formed due to constructive and destructive interference of light waves from the two slits.

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The kinetic energy of the roller coaster is 1000J.

Kinetic Energy is the energy of an object because the object is in motion. Force must be applied to the object to apply acceleration on the object. When a person applies force work is done and as the work is done energy is transfered to the object.

Given, m=20kg

v=10m/s

Kinetic Energy=0.5×m×v²

=0.5×20×(10)²

=1000J

Thus, the kinetic energy of the roller coaster is 1000J.

I hope this answer helps.

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Answer:

The answers to this question is:

1. inner ear

2. outer ear

3. middle ear

Explanation:

Hope that helps!

Answer:

inner, outer, middle

Explanation:

Answer:

a = 5

Explanation:

F = M × A

15 = 3 × a

a = 15 / 3

a = 5

This is only if the toy can is pushing the book or smth coz the question looks incomplete...?

Answer:

5 m/s^2

Explanation:

Realize that Newton's Second Law explains that the net force is equal to the mass mulitplied by the acceleration, or in simple terms, F=ma. In the problem, the force is 15 newtons, and the mass is 3 kg. Substiting and dividing, we get 5 m/s^2 (5 meters per second squared).

The ratio of the greater acceleration to the lesser acceleration is approximately 0.985.

In the top image where all four forward thrusters are engaged, the total forward thrust exerted on the sled is 519 N. The backward force due to friction and air drag is 20 N. Using Newton's second law, we can calculate the acceleration in this case:

Forward thrust - Backward force = Mass * Acceleration

519 N - 20 N = Mass * Acceleration₁

In the bottom image, in addition to the four forward thrusters, one reverse thruster is engaged, creating a reverse thrust of magnitude 7 N. The backward force of friction and air drag remains the same at 20 N. The total forward thrust can be calculated as:

Total forward thrust = Forward thrust - Reverse thrust

Total forward thrust = 519 N - 7 N = 512 N

Again, using Newton's second law, we can calculate the acceleration this case:

Total forward thrust - Backward force = Mass * Acceleration

512 N - 20 N = Mass * Acceleration₂

To find the ratio of the greater acceleration (Acceleration₂) to the lesser acceleration (Acceleration₁), we can divide the equations:

(Acceleration₂) / (Acceleration₁) = (512 N - 20 N) / (519 N - 20 N)

Simplifying the expression, we get:

(Acceleration₂) / (Acceleration₁) = 492 N / 499 N

(Acceleration₂) / (Acceleration₁) ≈ 0.985

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Answer:

As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude

Answer: I think its 120

Explanation: thx for the free points :)

Answer:

Stars are very massive stellar objects, which means that they have a very intense force of gravity. This is the first of the forces entering this "war".

In addition to that, due to the force of gravity that drives the star to contract, the process known as fusion occurs (the union of atoms of one element that results in another element, hydrogen fuses in stars to produce helium). The fusion created in the high temperatures of the center of the star generates an enormous amount of energy (which causes the stars to shine) and a force going outward of the star counteracting gravity, this is the second force in the "war" .

In a stable star these two forces (gravity going inward and the pressure created by the fusion going outward ) are in balance, preventing the star from exploding or collapsing. But eventually the star exhausts its "fuel" (hydrogen atoms) to produce fusion within it (although stars also fuse helium and other heavier elements, but once the hydrogen is finished the star is near its end), which decreases the force outward from the star, making the force that wins this battle to be the force of gravity.

When the force of gravity wins, the star collapses on itself and from here, depending on the star's mass, several things can happen, such as the star becoming a white dwarf, a supernova, even a black hole.

The life cycle of stars may be boiled down into a tug of war, lasting billions of years, between two basic forces -

Stars are very massive stellar objects and remain the longest in the stage when it is burning Hydrogen into Helium.

Thus,

The life cycle of stars may be boiled down into a tug of war, lasting billions of years, between two basic forces -

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Light waves cannot travel through solid objects. Therefore, the correct answer is option B.

Lightwaves or visible light are a part of electromagnetic waves/radiation that can be perceived by the human eye. It can travel through various types of mediums and even in a vacuum.

When light travels, it interacts with the atoms and molecules in the medium that it is going through. Because of that, light travels fastest in an empty space and travels the slowest in solid objects.

That being said, light can not travel through many kinds of solid objects. It's because solid objects tend to absorb light instead of allowing it to pass through them.

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Answer:

6Newton meter is the answer.

Explanation:

Mass=m=3kg

Velocity=v=2m/s

Kinetic energy =K.E.=?

As we know that

K.E.=1/2mv^2

Putting the values

K.E.=1/2✖️3kg✖️(2m/s)^2

K.E.=1/2✖️3kg✖️4m^2/s^2

K.E=1/2✖️12Nm

K.E.=6Nm is your answer

Hope it will help you :)

The kinetic energy of a 3-kilogram ball that is rolling at 2 meters per second is E = 6 joules.

To find the Kinetic Energy, the given details are

Mass of the ball, m = 3 kg

Speed of the bag, v = 2 m/s

The energy that is possessed due to the motion of an object is called the kinetic energy of the ball.

Its formula is given by :

E = 1/2 mv²

E = \(\frac{1}{2}\) (3)(2)²

E = 6 joules

So, the kinetic energy of the ball is 6 joules. Hence, this is the required solution.

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The map shows that the adoption of metal currency helped Greece establish colonies apart from the mainland. Option  A is the correct answer.

Some of the most significant Greek colonies include:

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Answer:

Using X = sum( x's * mass)/sum( masses)

= [(0)*(6400)+ (-9.5*1000) + (9.5)*(1000) + (9.5)*(1000)]/(6400+1000+1000+1000)

= 1.01 m

Y = sum( y's * mass)/sum( masses)

= [(0)*(6400) + (9.5)*(1000) +(-9.5)*(1000) + (-9.5)*(1000)]/ (6400+1000+1000+1000)

= -1.01 m

Hydroelectric power plants can cause harm to the environment and local ecosystems, especially when dams are built to create reservoirs.

While hydroelectric power is considered a clean energy source because it doesn't produce harmful emissions or pollutants, it does have negative environmental impacts. The construction of dams and reservoirs can cause significant damage to natural habitats, disrupt water flow, and alter the ecology of local rivers and streams.

This can have a detrimental effect on fish populations, migratory patterns, and even erosion of riverbanks. Additionally, the building of dams and reservoirs can lead to the displacement of communities and the loss of cultural heritage sites. The reliance on hydroelectric power can also be affected by climate change as reduced rainfall can lead to lower water levels in reservoirs, impacting the amount of electricity that can be generated.

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Answer:The electrostatic force is directly related to the product of the charges and inversely related to the square of the separation distance.

Explanation:

Explanation:

the answerer is visible

Genetic material is known to absorb UV light. Given what we know, we can confirm that genetic material is not known to absorb light originating from an infrared or microwave radio source.

Genetic material is the hereditary substance in the cell. It carries all information specific to an organism. It is known as DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)

UV light is electromagnetic radiation, and the primary source of UV light that we are exposed to is the sun.

Therefore, given that the only form of light listed that genetic material is known to absorb is that of Ultraviolet or UV light, we can confirm that the answer to the question proposed is infrared and microwave radio light.

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Answer:

W = F × d

W = 15 × 3

W = 45 Joules

The system of forces that would make the object not to move is shown in  option A.

We know that a force is a vector. A vector is a quantity that does have both magnitude and direction. This implies that we would know the direction in which the vector would move by looking at the direction that is indicated.

A force could have direction because force is a vector quantity. We know that an object is going to remain at rest if the object is acted upon by balanced forces. According to the Newton's first law, the only time that an object would move is if the object has been acted upon by external forces.

We now have to look at the horizontal forces that act on the object. The image that shows horizontal forces of the same magnitude in both directions would not make the object to move.

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Outcome variable (dependent variable): survival rates of tortoises in the Galapagos islands.

The outcome variable in this investigation is the survival rates of tortoises in the Galapagos islands, which will be impacted by the independent variable, neck length. By measuring the survival rates of tortoises with different neck lengths, the scientist can determine if there is a correlation between neck length and survival rates. This investigation is important because it can provide insights into how evolutionary adaptations, such as neck length, can impact the survival of species in their natural habitats. Ultimately, this knowledge can inform conservation efforts and help protect vulnerable species.

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Answer:

A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase.

Explanation:

In Physics, Doppler effect can be defined as the change in frequency of a wave with respect to an observer in motion and moving relative to the source of the wave.

Simply stated, Doppler effect is the change in wave frequency as a result of the relative motion existing between a wave source and its observer.

The term "Doppler effect" was named after an Austrian mathematician and physicist known as Christian Johann Doppler while studying the starlight in relation to the movement of stars.

The phenomenon of Doppler effects is generally applicable to both sound and light.

An example of the Doppler effect is a police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase. This is so because when a sound object moves towards you, its sound waves frequency increases, thereby causing a higher pitch. However, if the sound object is moving away from the observer, it's sound waves frequency decreases and thus resulting in a lower pitch.

Other fields were the Doppler effects are applied are; astronomy, flow management, vibration measurement, radars, satellite communications etc.

Answer:

A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase.

Explanation:

This should be the correct answer.

Answer:

A comet

Explanation:

The picture is of an elliptical orbit of a comet. You can tell it is a comet because of the tail. Also, I just took the test and it was a comet.

Answer:

-39.2m/s

Explanation:

Given that :

t = 4secs

g = -9.8m/s^2

v = ?

u = 0m/s ( since it was at rest )

V = u +at............. 1

Where v is the final velocity

a = -g = -9.8m/s^2 since the ball was dropped from a height which will eventually make it move against gravity

t = 4secs

Substitute the values into 1

v = 0 - 9.8×4

v = -39.2m/s