In an experiment, a ringing bell is placed in a vacuum jar that does not have any air in it. What best describes why the bell is seen vibrating but not heard?

The efficiency of the heat engine can be found using the formula: efficiency = (work output / heat input) = (Q23 - Q14 / Q23), where Q23 is the heat absorbed by the gas during the isothermal process at temperature T3, and Q14 is the heat released by the gas during the isothermal process at temperature T1.

From the diagram, we can see that the pressure and volume at point 1 are (P1, V1) = (3.00 x 105 Pa, 0.0200 m3), and the pressure and volume at point 3 are (P3, V3) = (1.20 x 105 Pa, 0.0800 m3). Since the gas is monatomic and ideal, we can use the equation of state PV = nRT to find the temperature at points 1 and 3: T1 = P1V1 / (nR) and T3 = P3V3 / (nR). Since the working substance is a closed cycle, we know that the temperature at points 2 and 4 must be the same as T1 and T3, respectively.

To find the heat absorbed and released by the gas during the isothermal processes, we can use the formula Q = nRT ln(Vf / Vi), where n is the number of moles of gas, R is the gas constant, and Vi and Vf are the initial and final volumes of the gas during the process. Since the gas is monatomic, we know that the internal energy of the gas only depends on its temperature, so the change in internal energy (AE) during the isothermal processes is zero. Therefore, the heat absorbed and released by the gas must be equal in magnitude but opposite in sign, so Q23 = - Q14. We can then substitute these values into the efficiency formula to find the efficiency of the heat engine.
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By prolonging contact with the punch, the impact power is lessened. Impulse is the result of the product of the force and the application time.

The word "force" has a clear definition. At this level, calling a force a push or a pull is entirely appropriate. A strength is not a property an object "already has in" or that it "contains."

An acceleration-inducing push is referred to as a force. This can literally mean pushing anything, such as moving a large piece of furniture around a room by pushing on it. It might not be as concrete as pressing the gas pedal on a car.

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If I were in a boat over deep water and a tsunami wave passed beneath us, then it would take only a few minutes to lift the boat up and down. Only in a few minutes, the wave can lift the boat.

The movement of water particles are up and down while the waves passes. The wave carries the energy forward. They generally oscillate about a fixed position. As the boat at rest moves up and down that means the water particles are oscillating in vertically up and down position. The wave is carrying the energy forward. Tsunami waves are generally very long and low out in the deep water of the central ocean, they pile up to become very high when slowed by the friction in shallow water near the shore. A tsunami is a set of extraordinarily long waves brought on by a significant and abrupt movement of the ocean, generally brought on by an earthquake or volcanic eruption at or near the ocean's bottom. Waves produced by this force travel in all directions away from their source, occasionally spanning entire ocean basins.

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C. a decrease in energy.

When water vapor cools, its molecules lose energy, causing them to move closer together. As the molecules become more closely packed, they eventually form liquid water. This change in the state of matter is known as condensation.

When water vapor loses energy through cooling, its molecules become closer together and eventually form liquid water. This process is called condensation.

Therefore, the correct answer to the question is C. a decrease in energy.

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Answer:

The height of the cliff is approximately 127.31 meters

Explanation:

The given parameters are;

The upward speed of the ball = 30 m/s

The time after the ball is thrown before it lands = 9 s

We have;

The time to maximum height;

v = u - g·t

Where;

v = The velocity at maximum height = 0 m/s

u = Initial velocity = 30 m/s

g = The acceleration due to gravity = 9.81 m/s²

∴ 0 = 30 - 9.81 × t

t = 30/9.81 = 3.06 s

The maximum height can be obtained from;

v² = u² - 2·g·s

v = 0 m/s

u² = 2·g·s

30² = 2 × 9.81 × s

s = 30²/(2×9.81) = 45.87 m

The time from maximum height to landing = 9 - 3.06 = 5.942 s

The height to landing

s = u·t + 1/2·g·t².

Here, u = 0 m/s

s = 0×5.942 + 1/2×9.81×5.942² = 173.1766 m

s = 173.1766 m.

The height of the cliff = 173.1766 m. - 45.87 m. ≈ 127.31 m.

Answer:

the horizontal axis is called the x axis.

Given what we know, as with all substances, the particles in the bowl of hot soup will slow down as they cool after being poured.

Therefore, the motion of the particles of the soup decrease or slows down as the soup cools due to the loss of energy they are experiencing. The soup radiates heat energy into the room or plate, causing the particles to lose energy and slow down.

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Answer:

Labor Day Weekend--No School

9/1/2021

Hello Students!

There will be no School on Friday Sept 3 and Monday Sept 6

All centers will be closed on Friday 9/3 and Monday 9/6

School will resume on TUESDAY, Sept 7

Enjoy your long weekend!

Explanation:

Labor Day Weekend--No School

9/1/2021

Hello Students!

There will be no School on Friday Sept 3 and Monday Sept 6

All centers will be closed on Friday 9/3 and Monday 9/6

School will resume on TUESDAY, Sept 7

Enjoy your long weekend!

To better understand and treat caused diseases, a pure bacterial culture is still necessary for the research of its virulence, susceptibility to antibiotics, and genomic sequence.

Incubation time, nutrients, environment, and temperature were empirically changed in the early culture conditions before culture was increasingly replaced by molecular techniques. Microbiologists that specialize in intracellular bacteria were responsible for the resurgence of culture in clinical microbiology. An expansion of the archaea's repertory was made possible by the introduction of a new, adaptable media. However, among common bacterial diseases, the creation of axenic medium for the culture of Treponema pallidum or Mycobacterium leprae continues to be a significant obstacle that cultivators will be able to overcome with time and creativity.

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Answer:

\(a=\frac{v^2}{r}\)

\(v=\sqrt{a*r}\)

\(r=\frac{v^2}{a}\)

Explanation:

This is the formula for centripetal acceleration in terms of the tangential velocity (v) and the radius of the circular motion (r).  The expression for the acceleration is already given, so simply type it as shown:

\(a=\frac{v^2}{r}\)

For the velocity (v) multiply by "r" both sides and then use the square root to solve for v:

\(a*r=v^2\\v=\sqrt{a*r}\)

For the radius multiply both sides by r and then divide both sides by the acceleration (a) in order to isolate r completely:

\(a*r=v^2\\r=\frac{v^2}{a}\)

Sine = 0.9756, cosine = 0.2195, tan = 4.4444, cosec = 1.025, sec = 4.5556, and cotangent = 0.2250 are really the six trigonometric ratios of a angle in the triangle.

Trigonometry is the study pf angles and the angular connections between figures in two and three dimensions. The trigonometric functions that make up trigonometry are cosecant, cosine, cotangent, secant, sine, and tangent. These are also known as the circle functions.

Trigonometry is difficult since you must learn a variety of values for various functions in both degrees or radians. Your calculations would be inaccurate if you forget them or mix them up.

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Answer:

W = F x    work done by force F thru distance X

F = w + .25 w = 1.25 w where w is the weight of the whale

x = 15 m       distance the whale must be pushed

W = 1.25 w * x

W = 1.25 * 1.5E6 N * 15 m = 18.75E6 N * 15 m = 2.81E7 joules

Work done people on the whale in order to return it to the ocean is 5.625  ×10⁶ Joule.

The resistance provided by surfaces in touch as they move past one another is known as friction. To walk without slipping, traction is provided by friction. In most situations, friction is advantageous. They do, however, give a strong amount of opposition to the move.

Given parameter:

Weight of the whale, W = 1.5×10⁶ N.

The people push it back a distance, d  = 15 m.

Coefficient of friction on the surface, μ = 0.25.

The work done  by the people on the whale in order to return it to the ocean is equal to work done against the friction. As, No work is done against gravitation on moving a object on the surface of earth,  

Frictional force acting on the whale,

F= μ× normal reaction

=  μ× weight of the whale

= 0.25 × 1.5× 10⁶ N.

= 3.75 ×10⁵ N.

Hence, work done by the people = F.d =  3.75 ×10⁵ × 15 Joule

= 5.625  ×10⁶ Joule.

Hence, people have to do 5.625  ×10⁶ Joule work.

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Answer:

9.33333333 m / s2

Explanation:

140 N divided by 15 kg

All three bulbs burn dimmer than the original two bulbs because the resistance increases and the brightness decreases. Therefore, option (A) is correct.

In a series combination of bulbs or resistors, the resistors are connected end-to-end. Consider two resistors, R₁ and R₂ which are connected with each other in a series combination then their effective resistance will be given by:

Total Resistance of the circuit, R =  R₁ + R₂

In a series combination, the current will flow through one bulb and then through another bulb. The same current flows through each bulb in one direction. The total voltage of the circuit is equal to the sum of all the voltage drops across the bulbs.

Potential difference, V  = V₁ + V₂

The voltage increases when we add a third bulb in a series, the All three bulbs will burn dimmer than the original two bulbs as the resistance increases.

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To cause the 46 g particle to move to the right at 46 m/s, a net work must be done on the particle to change its velocity from 12 m/s to 46 m/s and its direction from left to right. The net work required to change the velocity and direction of the particle is 43.3352 J.

The kinetic energy of the particle when it is moving to the left at 12 m/s can be calculated using the formula:

K = (1/2)mv^2

where K is the kinetic energy, m is the mass of the particle, and v is its velocity. Plugging in the given values, we get:

K = (1/2) x 0.046 kg x (12 m/s)^2 = 3.3288 J

The kinetic energy of the particle when it is moving to the right at 46 m/s can also be calculated using the same formula:

K' = (1/2) x 0.046 kg x (46 m/s)^2 = 46.664 J

The change in kinetic energy is therefore:

ΔK = K' - K = 46.664 J - 3.3288 J = 43.3352 J

Thus, the net work required to change the velocity and direction of the particle is 43.3352 J. This work can be done by an external force acting on the particle over a certain distance.

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The lump of clay at 10 m/s has a larger initial momentum compared to the clay at 5 m/s. When the clay comes to a stop, the change in momentum for the clay at 10 m/s is greater than that of the clay at 5 m/s. Thus, the 1 kg lump of clay moving at 10 m/s experiences a greater impulse.

Impulse is defined as the change in momentum of an object and is calculated by multiplying the force exerted on an object by the time interval over which the force acts. In this case, impulse is given by the equation:

Impulse = Force × Time

Since we are comparing two scenarios with the same mass, the impulse depends solely on the velocity and time. The greater the change in velocity and the longer the time interval, the greater the impulse.

In the given scenario, the 1 kg lump of clay has a velocity of 10 m/s. Therefore, its initial momentum is given by:

Initial momentum = mass × initial velocity

                = 1 kg × 10 m/s

                = 10 kg·m/s

If this lump of clay comes to a stop, its final momentum would be zero. The change in momentum is therefore:

Change in momentum = final momentum - initial momentum

                 = 0 - 10 kg·m/s

                 = -10 kg·m/s

However, impulse is a scalar quantity, meaning it only represents magnitude. Therefore, the negative sign is disregarded, and the magnitude of the impulse is 10 kg·m/s.

Now let's consider the other scenario, where the lump of clay has a velocity of 5 m/s. The initial momentum in this case is:

Initial momentum = 1 kg × 5 m/s

                = 5 kg·m/s

If this lump of clay comes to a stop, its final momentum would be zero. The change in momentum is therefore:

Change in momentum = final momentum - initial momentum

                 = 0 - 5 kg·m/s

                 = -5 kg·m/s

Again, we disregard the negative sign and consider the magnitude of the impulse, which is 5 kg·m/s.

Comparing the two scenarios, we can conclude that the 1 kg lump of clay at 10 m/s has a greater impulse (10 kg·m/s) compared to the 1 kg lump of clay at 5 m/s (5 kg·m/s).

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The net work done on the ice cream cone is zero joules.

The net work done on an object is calculated using the formula:

Net work = Force * Distance * cos(theta)

where:

Force is the applied force on the object,

Distance is the displacement of the object, and

theta is the angle between the force and the displacement vectors.

In this case, the child is moving at a constant velocity, which means there is no acceleration or change in speed. Therefore, the net force on the ice cream cone is zero Newtons since it is not being accelerated or acted upon by an external force.

When the net force is zero, the work done on the object is also zero, regardless of the distance traveled.

Given that the child carries the ice cream cone for 1.0 m across a level surface, the distance traveled is 1.0 m.

Since the net force is zero, the angle theta between the force and displacement vectors is irrelevant in this case.

Plugging the values into the formula, we have:

Net work = 0 N * 1.0 m * cos(theta)

Net work = 0 joules

The net work done on the ice cream cone is zero joules.

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Answer:

9

Explanation:

A particle travelling at a specific speed through a magnetic field experiences a force known as the magnetic force.

Magnetic Force:

A particle travelling at a specific speed through a magnetic field experiences a force known as the magnetic force. This relates to the cross-product of the magnetic field and velocity.

Answer and Explanation:

(a) The magnetic force is given by

F=qvBsinθ

q=1.60×10−19C  , the charge of a proton

v is the velocity

B  is the magnetic field

θ  is the angle between the velocity and the magnetic field. Since the magnetic force is at maximum, then the velocity and the magnetic field is perpendicular.

Solving for the magnetic field:

B=F/qvsinθ= 9.0×10−14N/ (1.6×10−19 C)(3.7×106 m/s)sin90∘=0.15 T

By the right-hand rule, the direction of the magnetic field is upward, perpendicular to the earth's surface.

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A particle travelling at a specific speed through a magnetic field experiences a force understood as the magnetic force.

The magnetic force is a force that is felt by a particle moving in a magnetic field at a particular speed. This has to do with the magnetic field and velocity's cross-product.

(a) The magnetic force is given by

F=qvBsinθ

q=1.60×10−19C  , the charge of a proton

v is the velocity

B  is the magnetic field

The angle between the magnetic field and the velocity is called. The magnetic field and velocity are perpendicular because the magnetic force is at its greatest.

B=F/qvsinθ= 9.0×10−14N/ (1.6×10−19 C)(3.7×106 m/s)sin90∘=0.15 T

By the right-hand rule, the direction of the magnetic field is upward, perpendicular to the earth's surface.

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The angular speed of the blade in radians per minute is 31,416 rad/min. angular and linear speeds the circular blade on a saw rotates at 5000 revolutions per minute.

If r is an object's radius, v is its linear speed and is its angular velocity in radians per unit of time, then v = r. This formula connects these three values so that we can always determine the third if we know the first two.

Thus, the angular speed times the r-dimensional distance equals the linear speed of a point on the object. The unit of measurement is meters per second and meters per second. where = the rate in radians per second.

(a) To find the angular speed of the blade in radians per minute, we can use the formula:

angular speed (rad/min) = 2 * pi * (revolutions per minute)

angular speed (rad/min) = 2 * pi * 5000 revolutions per minute

= 31,416 rad/min

(b) To find the linear speed of a blade tip, we can use the formula:

linear speed (inches/min) = (diameter of the blade) * (angular speed (rad/min))

linear speed (inches/min) = (diameter) * (angular speed (rad/min))

= (diameter) * (31,416 rad/min)

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The answer is that useful mechanical work is being done in both scenario 1 (Dave climbing a ladder) and scenario 3 (Dave washing his car).

Useful mechanical work is being done in both scenario 1 (Dave climbing a ladder) and scenario 3 (Dave washing his car). Let's examine each scenario:

Dave is climbing a ladder: In this scenario, Dave is exerting a force against gravity to move his body upwards. This involves the application of force over a distance, which is the definition of mechanical work. Therefore, useful mechanical work is being done as Dave climbs the ladder.

Dave's stomach begins to digest his lunch: Digestion is a biological process that occurs within the body and is not considered mechanical work. It involves chemical and enzymatic reactions in the stomach to break down food, but it does not involve the application of force over a distance. Thus, no useful mechanical work is being done in this scenario.

Dave washes his car: When Dave washes his car, he applies force to the cleaning materials and moves them across the car's surface, exerting work against friction. This work results in the cleaning of the car and is considered useful mechanical work.

Therefore, the answer is that useful mechanical work is being done in both scenario 1 (Dave climbing a ladder) and scenario 3 (Dave washing his car).

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In dynamic study modules, a student can demonstrate mastery of a question by correctly answering it several times in a row.

As the student works through the module, they will encounter questions and receive immediate feedback on their responses. If the student answers a question correctly, they will move on to the next question. If they answer incorrectly, they will receive an explanation of the correct answer and will be given another opportunity to answer the same question.

In addition to the mastery-based approach, dynamic study modules may also use other measures to determine whether a student has mastered a question, such as tracking the time it takes the student to answer the question or the number of attempts it takes for the student to answer correctly.

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Answer:

\(\small\color{aqua}\tt{{a}}\)

hope it's help

The horse has the highest momentum among the three animals.

Given the following data:

In Physics, Momentum can be defined as the multiplication (product) of the mass of a physical object and its velocity.

Basically, momentum is a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

\(Momentum = Mass\) × \(Velocity\)

In this scenario, the momentum of the elephant is zero (0) because the elephant is at rest, meaning it is not in motion.

Furthermore, both the cheetah and horse are having the same velocity of 80 km/h but the horse has a higher mass of 500 kilograms.

Hence, we can deduce that the horse has the highest momentum among the three animals.

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The density of the given cube is 0.0007024 g/mm³.

The density of a cube can be calculated by dividing the mass of the cube by its volume, which is the side cubed. Density=mass/volume

So, the density of the given cube can be determined as:

Density = 8.74g / (10.7 mm)³

Density = 8.74g / (10.7 mm × 10.7 mm × 10.7 mm)

Density = 8.74g / 12451.57 mm³

Density = 0.0007024 g/mm³

Therefore, the density of the given cube is 0.0007024 g/mm³.

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Answer:

The third one

Explanation:

That's how reflections work.