▾ Part A
Calculate the quantity of heat absorbed by 50 g of water that warms from 30°C to 90°C.
Express your answer in calories.

* Q = ___ cal

Answer:

Hi good morning sir I am not

You must promptly inform the nearby NTSB office that the elevator control cable has broken, per NTSB 830.

The operator is required to submit a report using NTSB Form 6120.1 or 6120.2, which can be obtained from NTSB Field Offices or the NTSB in Washington, D.C. 20594: ten days following an accident.

Any incident involving the operation of an aircraft that occurs between the time a passenger boards with the intention of taking off and the time they have all disembarked and in which a person is killed or seriously injured is referred to as an aircraft accident.

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Answer:

"a tile company collects and recycles old tiles from large facilities and makes m"

Explanation:

While the first two sound sustainable, and they are, they're not necessarily part of creating new products. The third option where "a tile company collects and recycles old tiles from large facilities and makes m" which is cut off although I'm assuming "makes more?" making it part of the process of creating new products, although it's more sustainable as it uses old products.

Answer:

The student did 4.54 joules of work. This can be determined by using the formula W = mgh, where W is the work done, m is the mass of the ball, g is the acceleration due to gravity, and h is the height to which the ball is thrown. In this case, m = 0.140 kg and h = 3.10 m, so W = 0.140 x 9.8 x 3.10 = 4.54 joules.

The acceleration of a 2,500-kg single-engine airplane just before takeoff when the thrust of its engine is 500N is, 0.2 m/s²

Acceleration is a vector quantity that describes the rate at which an object changes its velocity. It is the rate at which the velocity of an object changes in magnitude or direction, or both. In other words, it tells us how quickly an object is speeding up or slowing down. Acceleration has units of meter per second squared (m/s²) and its direction is the same as the direction of the change in velocity.

The net force acting on the airplane just before takeoff is equal to the thrust of the engine,

which is 500 N, minus the force of drag.

Since the airplane is just about to take off, the force of drag is relatively small,

So we can assume that the net force is equal to the thrust of the engine.

F = m x a

Where F is the net force, m is the mass, and a is the acceleration.

Substituting the values for F and m, we get:

500 N = 2,500 kg x a

Dividing both sides by 2,500 kg, we get:

a = 500 N / 2,500 kg = 0.2 m/s²

So, the acceleration of the 2,500-kg single-engine airplane just before takeoff when the thrust of its engine is 500 N is 0.2 m/s².

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Answer:

Work is defined as force x displacement in the direction of the force.  In this case the force is 558 N and the displacement is 3.3 m, so the work is 3.3 m x 558 N = 1,841.4 joules.

Power is work per unit of time.  1,841.4 J /29 s =  63 W.

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When the distance between earth and sun becomes  double,  the force between them reduces to 1/4th.

Gravity is a fundamental interaction in physics that causes all objects with mass or energy to attract one another. The weakest of the four fundamental interactions is gravity, by a wide margin.

At the macroscopic level, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.

When the distance between earth and sun becomes  double,  the force between them reduces to 1/4th.

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In the electromagnetic spectrum, EM radiation includes radio waves, visible light, and gamma rays.

What is a spectrum?

The characteristic wavelengths of electromagnetic radiation (or a subset thereof) emitted or absorbed by a material, atom, or molecule are called spectra. A spectrum is a state that can vary continuously along a continuum and is not limited to a set of values. After passing through a prism, visible light takes on a rainbow of colors, as the term was originally used scientifically in optics.

We study the electromagnetic radiation, or EM radiation, that interstellar clouds emit and receive from them. The range of this EM radiation includes radio waves, visible light and gamma rays in the electromagnetic spectrum.

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To calculate the acceleration of an object moving in a straight line, divide the change in velocity by the time during which the acceleration occurs.

The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting.

To calculate acceleration, you need to divide the change in velocity (delta v) by the change in time (delta t) during which the acceleration occurs. The formula for acceleration is a = Δ v / Δ t.

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The statement regarding the electric forces on the objects is true: f: ab 5 2f: ba.

As the space between two charged items grows, so do the electric forces between them. With more charge on the objects, there are greater electric forces between the charged things. Each object's charge has a direct impact on electrostatic force. Therefore, if the charge of one object is doubled, the force will increase by two times.

There is either a push or a pull. The effects of forces include moving an object, altering its speed, altering its shape, or changing the volume of a body.

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The instantaneous velocity of an object may be equal to its standard velocity if it has uniform velocity.

The definition of instantaneous velocity is the rate of change of position over a relatively brief time period (almost zero). m/s, the SI unit of measurement. The size of the immediate velocity is known as the instantaneous speed. Although it lacks a direction, it has the same value as instantaneous velocity.

Simply said, the speed of an object at that precise moment. The definition of instantaneous velocity is "The velocity of an item in motion at a certain point in time."

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Answer:

Explanation:

The pressure is calculated by dividing the force by the area:

P = F / A = 160 N / 24 cm² = 6.67 N/cm²

The uncertainty in the calculation of pressure can be determined by propagating the uncertainties in the force and area measurements. According to the formula for uncertainty propagation, the fractional uncertainty in the pressure calculation is:

ΔP / P = √((ΔF / F)^2 + (ΔA / A)^2)

Plugging in the values:

ΔP / P = √((6 N / 160 N)^2 + (3 cm² / 24 cm²)^2)

ΔP / P = √(0.0375) = 0.195

So the fractional uncertainty in the pressure calculation is 0.195 or 19.5%.

To find the absolute uncertainty in the pressure, multiply the fractional uncertainty by the pressure:

ΔP = P * ΔP / P = 6.67 N/cm² * 0.195 = 1.29 N/cm²

So, the pressure is 6.67 ± 1.29 N/cm².

The duration of motion is 1.11 seconds, and the average acceleration during impact is 9.8 m/s2.

Average lead weight acceleration during impact:

The gravitational pull of 9.8 m/s2 will cause the lead weight to descend.

Lead weight's time of motion is given by t = 2h/g.

where:

The entire height of the fall is given by h, which is equal to 6 metres plus 0.4 centimetres, or 6.004 metres per second.

t = 1.11 s

As a result, the period of motion is 1.11 s, and the average acceleration during impact is 9.8 m/s2.

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The point t = 0 to t = 8 depict the acceleration of the object.

Acceleration is a measure of the change in velocity of an object over time. It is a vector quantity that describes the rate at which an object changes its speed or direction of motion. Acceleration is calculated as the rate of change of velocity, and is expressed in units of meters per second squared (m/s²).

We can see from the graph that between t = 0 and t =8 was the time that the object underwent acceleration.

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The total work done is equal to the work done by the spring[tex](400 N/m \times 0.20 m)[/tex]  Plus the work done by gravity[tex](0.50 kg \times 9.8 N)[/tex]. The total work done is equal to [tex](1/2) (0.50 kg) v^2 + (0.50 kg) (9.8 N/kg ) (0.80 m)[/tex].

A force of attraction known as gravity exists between any two mass-containing objects. It is the force responsible for keeping the Earth and other planets orbiting the Sun, and for keeping us firmly rooted to the ground.

Gravity is what keeps us and everything else on the ground and not floating off into space.

A 0.50 kg block is placed on top of an inclined plane with a height of 0.80 m and a spring with a spring constant of 400 N/m is connected to the block. The block is then released from a height of 0.20 m above the ground.

The block then slides down the inclined plane while compressing the spring and is eventually brought to rest by the force of gravity.

Therefore, The total work done is equal to the work done by the spring [tex](400 N/m \times 0.20 m)[/tex] Plus the work done by gravity (0.50 kg x 9.8 N). The total work done is equal to [tex](1/2) (0.50 kg) v^2 + (0.50 kg) (9.8 N/kg) (0.80 m).[/tex]

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Charging less for phone services in one location to drive out a competitor is  considered to be price discrimination.

A selling tactic known as price discrimination involves charging clients various rates for the same good or service depending on what the vendor believes they can persuade the customer to accept.

When a merchant uses pure price discrimination, they charge each consumer the highest price they will agree to.

In more prevalent types of price discrimination, the supplier divides clients into groups based on particular characteristics and assesses a different price to each group.

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The air speed of an airplane traveling 80 meters east and 20 meters south in a second relative to the ground is about 82.46 m/s

The air speed of a flying airplane relative to (a specified location on) the ground is the difference between the airplane's ground speed and the speed of the wind, found using vectors as follows;

Mathematically, we get;

Whereby the velocity of the wind is 120 m/s and the airplane is traveling with an airspeed of 300 m/s due east for example, and the airplane travels 80 meters east and 20 meters south relative to the ground in one second, we get;

Resultant valocity = 80 m/s East, 20 m/s South

v = 80·i - 20·j

The magnitude of the velocity of the plane relative to the ground can be found, using the formula for the magnitude of  resultant vector as follows;

|v| = √(80² + (-20)²) = 20·√(17) ≈ 82.46

The air speed of the plane relative to the ground is therefore;

|v| ≈ 82.46 m/s

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The temperature distribution t(x) across a wall with steady heat flux conducted through it, t(x) = -Q/(2k) x² + (T2 - T1 + QL/2k)/L x + T1 - QL²/(4k).

To obtain the temperature distribution t(x) across a wall with steady heat flux conducted through it, we need to solve the one-dimensional heat conduction equation,

d²t(x)/dx² = -Q/k

Where t(x) is the temperature at position x, Q is the steady heat flux conducted through the wall, and k is the thermal conductivity of the wall material.

t(x) = -Q/(2k) x² + Ax + B

Boundary conditions,

t(0) = T1 and t(L) = T2

Where T1 and T2 are the temperatures at the two ends of the wall, and L is the length of the wall.

Using these boundary conditions,

A = (T2 - T1 + QL/2k)/L

B = T1 - QL²/(4k)

Substituting these values of A and B in the equation for t(x),

t(x) = -Q/(2k) x² + (T2 - T1 + QL/2k)/L x + T1 - QL²/(4k)

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Answer:

Explanation:

Centripetal acceleration is the acceleration that points towards the center of a circular path and is responsible for keeping an object moving in a circular path. The equation for centripetal acceleration is:

a_centripetal = v^2 / r

where v is the speed of the object and r is the radius of the circular path.

Centripetal force is the force that acts on an object moving in a circular path and is directed towards the center of the circular path. It is equal to the product of the mass of the object and its centripetal acceleration. The equation for centripetal force is:

F_centripetal = m * a_centripetal

where m is the mass of the object.

The structure of the statement is cause and effect.

option A is the correct answer.

The structure of the statement is "cause and effect" because it describes a situation where one thing (polluted water) is the result of another (lack of stricter laws about dumping into the river).

The statement suggests that the cause (lack of stricter laws) will continue to result in the same effect (polluted water) unless some action is taken to change the cause. In this way, the statement explains the relationship between the two events or situations and how one leads to the other.

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If the item were orbiting at a distance of 5,000 km, there would be a gravitational force of 40 N.

Gravitational force is the name for the force that the earth exerts on a body. Among other instances of motion caused by gravitational force are the leaves and fruits that fall from trees and land on the ground, the water that flows down rivers, and a ball that is tossed up that travels to a height before landing back on the ground.

A substance's gravitational pull is:

F = GMm / r²

Where G is the gravitational constant over all space and time,

A single object's mass is M. (the planet),

The weight of the opposing item is m.

r is the separation between the items.

F is equal to 10 N at 10,000 km.

(10 N) = GMm / (10,000 km) (10,000 km)

²

GMm=109 N km2

Whenever r is 5,000 km:

F = (10⁹ N km²) / (5000 km) (5000 km)

F = 40 N.

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A 10 kg object dropped from a certain window strikes the ground in 2.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in 1.41 seconds.

The time it takes an object to fall to the ground is determined by its initial velocity, which is zero, and its acceleration due to gravity, which is constant at 9.8 m/s² on the surface of the Earth.

The distance fallen can be calculated using the equation:

d = 1/2 × a × t²,

where d is the distance, a is acceleration and t is time.

We can assume that the height from which both the 10 kg and 5 kg objects were dropped is the same, so the distance fallen is the same for both. We can rearrange this equation to solve for time:

t = √(2d/a)

t = √(2 × d / 9.8)

t = √(2 × 2.0² / 9.8)

t = √(8 / 9.8)

t = 1.41 s

Therefore the 5 kg object strikes the ground in 1.41 seconds.

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The correct statement is (d) The charge on the plates is increased four times its original value.

What is parallel plate capacitor?  

A parallel plate capacitor is a type of capacitor that consists of two parallel conductive plates separated by a dielectric material. It is a type of capacitor used in electrical circuits to store electrical energy. The plates are usually made of metal and the dielectric material is usually a thin non-conductive material like paper or plastic. The size of the capacitor is determined by the distance between the plates and the dielectric material.

This is because the charge on the capacitor plates is proportional to the voltage across the plates and the capacitance, which is given by the formula C = ε_0 * A / d, where ε_0 is the electric constant and A is the area of the plates.

When the plate separation is decreased to d/4, the capacitance of the capacitor becomes C' = ε_0 * A / (d/4) = 4 * ε_0 * A / d, and thus the charge on the plates becomes Q' = C' * V = 4 * Q.

Therefore, The charge on the plates is increased four times its original value is the correct answer.

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A. "Both Bob and Alice must have thrown the balls with the same speed" and D. "Both balls must have reached the same maximum height" are true statements.

When two objects are thrown vertically upwards with the same starting height and take the same amount of time to reach their maximum height, it can be concluded that both objects were thrown with the same speed, as their time of flight is dependent on their initial velocity. Additionally, since they started from the same height, their maximum height must also be the same.

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The de Broglie wavelength associated with an electron accelerated through a potential difference of 1 kV will be 1.242 nm.

de Broglie wavelength is λ

λ = hC/eV₀ [V₀ = 1 kV]

λ = (hC/e) (1/V₀) [hC/e = 12.42 × 10⁻⁷]

λ = (12.42 × 10⁻⁷) (1/10³)

λ = 1.242 × 10⁻⁹ m

λ = 1.242 nm

Therefore, the de Broglie wavelength associated with an electron accelerated through a potential difference of 1 kV will be 1.242 nm.

de Broglie wavelength is an essential concept while exploring quantum mechanics. The wavelength (λ) that is associated with an object in reference to its momentum and mass is learned as the de Broglie wavelength. A particle's de Broglie wavelength is inversely proportional to its force.

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The angular acceleration of its tires is 26.23 rad/s².

The number of revolutions is by the tire is 24.57 rev.

The time it takes the car to stop is 48.2 s.

The distance of the car will be calculated in d = v0 × t + (1/2) × a × t²

And the car's initial speed in v0.

a) The formula for angular acceleration (α) can be calculated as α = r/a, where r is the radius of the tire and a is the linear acceleration. So, in this case, α = 0.26 / 7.6 = 26.23 rad/s².

b) The formula for angular velocity (ω) at a given time can be calculated as ω = ω0 + αt or ω² = ω²0 + 2αΔΘ , where ω0 is the initial angular velocity and t is the time. To find the number of revolutions, find the time it takes for the angular velocity to reach 0. The equation would be 0 = 95 + 1.97t.  ω²= 2 x 26.23ΔΘ. = 9025 =  58.46ΔΘ

ΔΘ = 9025 / 58.46 = 154.375 rad. n = ωt / (2π). = 154.375/2π = 24.57 rev.

c) We can find the time it takes for the tires to come to rest by solving for t in the equation 0 = 95 + 1.97t. So, t = 95 / 1.97 = 48.2 s.

d) The distance traveled by the car can be calculated as d = v0 × t + (1/2) × a × t^2, where v0 is the initial speed and a is the linear acceleration. However, as the initial speed is not given, the distance cannot be determined.

e) The initial speed (v0) cannot be determined as it is not given in the problem.

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When we use the concept of the resultant speed to obtain the landing speed we have it as  146 m/s.

We would need to resort to talking about the resultant speed in this context. We know that the speed that the airplane would use to land is what we call the resultant speed of the air plane as we have it here.

We can now say that;

Resultant speed =√ (140)^2 + (40)^2

= 146 m/s

Thus we see that the speed of the airplane when the airplane is found to be landing is about  146 m/s.

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When two objects are suspended from wires, All of the above can result in such an attraction. The correct answer D.

When two objects are suspended from threads, the movement of one object close to the other can cause the electrons in the atoms of one object to be transferred to the other, resulting in one object gaining a positive charge and the other gaining a negative charge.

This causes the two objects to attract each other due to the opposite charges.

This phenomenon is known as electrostatic attraction, and it occurs due to the electrostatic force of attraction between charged objects. The strength of this force depends on the distance between the objects and the magnitude of their charges. When the objects are brought closer together, the force of attraction becomes stronger, and they may even stick together.

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If the stone hits the water in the well after falling for 1.7s then the depth of the well is about 14.16m.

The time required by the stone to fall and reach the bottom of the well is 1.7s.

Now, we know from the equation of motion,

H = ut + 1/2at²

Where,

H is the depth of the well,

u is the initial speed of the well that is zero in our case,

t is the time taken by the stone to hits the water.

Now, putting all the values,

H = 0.5 x 9.8 x 1.7 x 1.7

H = 14.16 m.

The depth of the well is 14.16m.

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