Just before take-off, the plane is speeding up along the ground.
Which statement is true?
Force B is zero.
Force B is greater than force D.
Force D is equal to force B

Answer:

Choice E.

Amplitude: \(20\; {\rm cm}\).

Frequency: \(2\; {\rm Hz}\).

Explanation:

The amplitude of a simple harmonic motion (SHM) is the maximum displacement from equilibrium.

In this question, the equilibrium is in the center of the two extremes. With one extreme at \(x = 10\; {\rm cm}\) and the other at \(x = 50\; {\rm cm}\), the center will be at \((1/2)\, (10 + 50)\; {\rm cm} = 30\; {\rm cm}\).

The maximum displacement will be \((50\; {\rm cm} - 30\; {\rm cm}) = 20\; {\rm cm}\) (or equivalently, \((30\; {\rm cm} - 10\; {\rm cm}) = 20\; {\rm cm}\).

Frequency measures the number of cycles completed in unit time (e.g., one second.) In one full cycle of an SHM, the oscillator will travel from one extreme to another and then back to the original extreme. In this question:

In other words, one full cycle of this SHM will take \(0.25\; {\rm s} + 0.25\; {\rm s} = 0.50\; {\rm s}\). The period of this SHM will be \(0.50\; {\rm s}\). Hence, the frequency of this SHM will be:

\(\begin{aligned} (\text{frequency}) &= \frac{1}{(\text{period})} \\ &= \frac{1}{0.50\; {\rm s}} \\ &= 2\; {\rm Hz}\end{aligned}\).

Answer:

LAW 1 :  For a given metal and frequency, the number of photoelectrons emitted is directly proportional to the intensity of the incident radiation.  

---------------------------------------------

LAW 2: For a given metal, there exists a certain frequency below which the photoelectric emission does not take place. This frequency is called threshold frequency.

-----------------------------------------------

LAW 3: For a frequency greater than the threshold frequency, the kinetic energy of photoelectrons is dependent upon frequency or wavelength but not on the intensity of light.

-----------------------------------------------

LAW 4: Photoelectric emission is an instantaneous process. The time lag between incidence of radiations and emission of electron is 10^-9 seconds.

Explanation:

Answer:

LAW 1 : For a given metal and frequency, the number of photoelectrons emitted is directly proportional to the intensity of the incident radiation. ... LAW 4: Photoelectric emission is an instantaneous process.

Answer: The scenario violates the second law of thermodynamics.

Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.

The water pressure at the base is 98,000 Pa, and the force exerted at the base of the tank is 2,768,460 N.

To find the water pressure at the base of the tank, take the formula:

Pressure = density × gravity × height

In which

Density = density of water (1000 kg/m³)

Gravity = acceleration due to gravity (9.8 m/s²)

Height = height of the column

According to question:

Height of the water column = 10 m

Take the formula:

P = 1000 kg/m³ × 9.8 m/s² × 10 m

= 98,000 Pa

To find the force at the base of the tank, take the formula:

Force = Pressure × Area

In which

Pressure = pressure at the base of the tank

Area = base area of the tank

The base area of a cylindrical tank can be found by the formula:

Area = π × r²

In which:

Diameter of the tank = 6 m

To find the radius, divide the diameter by 2:

Radius = 6 m ÷ 2

= 3 m

Put the values into the formula:

Area = π × (3 m)²

= 28.27 m²

Now, find the force:

Force = 98,000 Pa × 28.27 m²

= 2,768,460 N

Thus, the water pressure at the base is 98,000 Pa, and the force exerted at the base of the tank is 2,768,460 N.

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Answer: Please see the attached image.

Explanation:

A diagram of the Lewis dot structure depicts the valence electrons of the atoms of a molecule. It makes use of dots to represent lone electron pairs and lines to represent atomic bonds.

Valence Electrons are the s and p subshells on the periodic table. You count the total s and p subshells of the corresponding atom to find how much valence electrons it has.

The instantaneous power output at t = 3.7 s right answer is 99 W.

Power is defined by the amount of energy transferred over a period of time. Instantaneous power, on the other hand, refers to the power consumed at a point in time. Instantaneous power is an important metric in electronics. Instantaneous power is the power measured at a specific point in time.

The basic difference between average effort and instantaneous effort is that average effort is the ratio of total work time to total time. Although the instantaneous power is the limit of the average power. The statement of work does not state that the same amount of work he will complete in a second or an hour. Instantaneous power can be positive or negative. Positive instantaneous power means that energy is flowing from the source to the load, and negative instantaneous power means that energy is flowing from the load to the source.

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Answer: True

Explanation: Guessed on A p E x and it was correct

Answer:

True

Explanation:

a p e x

Answer:

c-) both objects will reach the bottom at the same instant.

(b) decrease.

Explanation:

Although the feather is lighter than the coin, the tube where the experiment is performed is evacuated. Therefore there is no air that prevents the feather from falling freely with the same acceleration and speed as the coin.

In fact in the equations of kinematics proposed by Newton, the mass of the bodies is not taken into account, as we can see in the following equation:

\(v_{f}= v_{i} +g*t\)

where:

Vf = final velocity [m/s]

Vi = initial velocity [m/s]

g = gravity acceleration [m/s^2]

t = time [s]

Therefore the answer is C.

Gravitational pull is a function of height, as the height of the body increases, the force of gravity decreases.

Answer:

The scientific method

Explanation:

The speed of the ball rebounding from the plate is approximately 13.2 m/s.

According to the graph, the greatest force exerted by the football on the force plate during impact is around 1900 N. The ball comes to a halt on the force plate before rebounding.

The kinetic energy of the ball before impact equals the kinetic energy of the ball after the rebound, according to the law of conservation of energy.

The speed of the ball rebounding can be calculated using the formula:

(1/2)mv²= (1/2)mv_0²

where m is the mass of the ball (0.43 kg), v is the speed of the ball rebounding, and v_0 is the initial speed of the ball (15 m/s).

Solving for v, we get:

v = sqrt(v_0² - (2F/m))

where F is the maximum force exerted on the force plate (1900 N).

Plugging in the values, we get:

v = sqrt(15² - (2*1900/0.43)) ≈ 13.2 m/s

Therefore, the speed of the ball rebounding from the plate is approximately 13.2 m/s.

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The middle ear compensates through 1) the area ratio of the tympanic membrane to the oval window (about 17x) and 2) the ossicular lever action (about 1.3x).

A) Due to impedance mismatch, only a small fraction of sound energy enters the liquid (Z2) from air (Z1).

Transmission coefficient T = 4Z1Z2/(Z1+Z2)^2. Assuming Z1=1 (air) and Z2=3400 (water), T ≈ 0.001, meaning 0.1% sound energy enters the liquid, while 99.9% is reflected.

B) Loss in dB = 10*log10(1/T) ≈ 30 dB.

The middle ear compensates through 1) the area ratio of the tympanic membrane to the oval window (about 17x) and 2) the ossicular lever action (about 1.3x).

Combined, they provide 22x amplification (27 dB). Both mechanisms contribute significantly to compensate for the loss.

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Hi there!

We can begin by using Lenz's Law:
\(\epsilon = -N\frac{d\Phi _B}{dt}\)

N = Number of Loops

Ф = Magnetic Flux (Wb)
t = time (s)

Also, we can rewrite this as:
\(\epsilon = -NA\frac{dB}{dt}\)

A = Area (m²)

Since the area is constant, we can take it out of the derivative.

This is a single wire loop, so N = 1.

Now, we can develop an expression for the induced emf.

We can begin by solving for the area:

\(A = \pi r^2 \\\\d = r/2 r = 0.05cm \\\\A = \pi (0.05^2) = 0.007854 m^2\)

We can also express dB/dt as:
\(\frac{dB}{dt} = \frac{\Delta B}{t} = \frac{0-0.5}{t} = \frac{-0.5}{t}\)

Now, we can create an equation.

\(\epsilon = -(1)(0.007854)\frac{-0.5}{t} = \frac{0.003927}{t}\)

To solve the system, we must now develop an expression for current given an emf and resistance.

Begin by calculating the resistance of the copper wire:
\(R = \frac{\rho L}{A}\)

ρ = Resistivity of copper (1.72 * 10⁻⁸ Ωm)
L = Length of wire (0.01 m)

A = cross section area (m²)

Solve:
\(R = \frac{(1.72*10^{-8})(0.01)}{\pi (0.001^2)} = 5.475 * 10^{-5} \Omega m\)

Now, we can use the following relation (Ohm's Law):

\(\epsilon = iR\\\\\epsilon = \frac{Q}{t}R\)

*Since current is equivalent to Q/t.

Plug in the value of R and set the two equations equal to each other.

\(\frac{Q}{t}(5.475 * 10^{-5}) = \frac{0.003927}{t}\)

Cancel out 't'.

\(Q (5.475 * 10^{-5}) = 0.003927 \\\\Q = \frac{0.003927}{5.475*10^{-5}} = \boxed{71.73 C}\)

Acceleration is the rate of change of velocity, so if velocity is linear, the acceleration is the slope of its graph.

Here, the line passes through the points (0, 1) and (0.5, 3), so its slope is

(3 m/s - 1 m/s) / (0.5 s - 0 s) = (2 m/s) / (0.5 s) = 4 m/s²

The resistance band's elasticity (stretchiness) dictates how easily it can be stretched or can be flexible.

It is the proportion of tensile stress to strain, where strain is the amount of deformation and tensile stress is the tension force applied to a surface area (amount of stretch of the resistance band).

Instead than requiring you to hold additional weight per se, resistance bands function by providing an external resistance force that can be imposed. They are flat, occasionally looping bands that might be thin or thick.

Both rubber bands and springs have a unique quality. The stretch distance affects how hard a band pulls back. The spring constant, denoted by the symbol k (in units of N/m), is a proportionality constant.

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The radius of the new stable orbit is around 13,500 kilometers.

First, find the velocity of the meteor relative to the Earth, which is:

V = 1000 km/h = 1000/3600 km/s = 0.2778 km/s

Since the probe is in orbit, it has a velocity of:

Vp = √(GMe/Re)

Where G = gravitational constant,

Me = mass of the Earth, and

Re = distance from the center of the Earth to the probe's original orbit.

Plugging in the values:

Vp = √((6.6743 × 10⁻¹¹ m³/(kg s²)) x (5.972 × 10²⁴ kg) / (25000 km + 6371 km)) = 7.785 km/s

The total momentum of the system is conserved, so:

(meteor × V) + (probe × Vp) = (meteor + probe) × Vf

Where Vf = velocity of the combined mass after the collision.

Solving for Vf:

Vf = [(meteor × V) + (probe × Vp)] / (meteor + probe) = (2000 kg x 0.2778 km/s + 1500 kg x 7.785 km/s) / (2000 kg + 1500 kg) = 6.083 km/s

Now find the radius of the new orbit using:

Vf = √(GMe/Rnew)

Solving for Rnew:

Rnew = (GMe)/(Vf²) = (6.6743 × 10⁻¹¹ m³/(kg s₂)) x (5.972 × 10²⁴ kg) / (6.083 km/s)² = 1.35 × 10⁷ m = 13,500 km

Therefore, the new stable orbit has a radius of approximately 13,500 km.

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Answer:

Explanation:

The horizontal velocity is 1.61.

Hi there!

22.

We can calculate the speed by first calculating the period of the stopper.

1 period = time taken for one revolution

10 rev/10 sec = 1 rev/sec

Since it takes 1 second for the stopper to make a complete circle, its velocity can be found using the equation for circumference:

\(v = \frac{2\pi r}{t} = \frac{2\pi (1)}{1} = \boxed{2\pi \approx 6.28 m/s}\)

23.

The centripetal force can be solved for using the following:

\(F_c = \frac{mv^2}{r}\)

m = mass (kg)

v = velocity (m/s)

r = radius (m)

Fc = Centripetal force (N)

Plug in the givens:

\(F_c = \frac{0.028(2\pi)^2}{1} = \boxed{1.105 N}\)

part a) If Q increases by 5 times its original value, the electrostatic force (F) will increase5 times as well.

part b) If r is halved (reduced by 2), the force will become four times stronger (since 2² = 4).

part c) If Q1 is positive and Q2 is negative, the charges will attract each other.

part d) If the force that Q1 exerts on Q2 is 5 times larger than the force that Q2 exerts on Q1 is same.

The electrostatic force is described as the force of attraction or repulsion between two charged particles.

With regards to Coulomb's Law, we have that the electrostatic force between two charges separated by a distance is :

Force = k * (Q1 * Q2) / r²

Where:

F_ =  electrostatic force

k = electrostatic constant

Q1 and Q2 =  magnitudes of the charges

r = distance

for case a:

If one of the charges, Q1 or Q2, increases by 5 times then the electrostatic force  will also increase by 5 times.

case b)

If the distance between the charges, r, is halved, the electrostatic force   will become four times stronger because (1/r²).

for case c.

if Q1 is positive and Q2 is negative, the charges will attract each other because of magnetic laws.

for case d.)

If the force that Q1 exerts on Q2 is 5 times larger than the force that Q2 exerts on Q1 is same as there is a resulting stronger gravitational or electromagnetic force.

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Answer: 520 nm; 5.77 × 1014 Hz; 3.82 × 10−19 J

The car is moving at approximately 12.5 meters per second.

The kinetic energy (KE) of an object can be calculated using the formula:

KE = 1/2 * m * \(v^2\)

where

KE = kinetic energy,

m =Mass of the object, and

v = velocity.

In this case, we are given the mass (m) of the car as 1600 kg and the kinetic energy (KE) as 125,000 J. To find the velocity .

Substituting the  values , we have:

125,000 J = 1/2 * 1600 kg *\(v^2\)

Now, we can solve for v by rearranging the equation:

\(v^2\) = (2 * 125,000 J) / 1600 kg

\(v^2\) = 156.25 \(m^2/s^2\)

Taking the square root, we find:

v = √156.25\(m^2/s^2\)

v ≈ 12.5 m/s

Therefore, the car is moving at approximately 12.5 meters per second.

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Answer:

There are two types of electric charge: positive and negative (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other. An object with an absence of net charge is referred to as neutral.

Explanation:

if you want my answer please brainliest please :)

Answer:

A distance is equal to displacement

Explanation:

An object traveling in a straight line moving East will have its displacement value to be equal to the distance.

Displacement is the distance traveled in a specific directions.

Distance is the total length of path traveled.

 The displacement of the object is the value of the distance due east.

 The distance is the value of the length of path covered.

The average temperature of the air in the room at 20 min is 23°C.

Temperature is the degree of hotness or coldness of the object.

A student heated 235 g of water in a beaker until the water reached 100°C. The student removed the beaker from the heat and placed the beaker on a counter in a 23°C room. The student recorded the temperature of the water every 4 minutes for 20 minutes.

The surrounding is vast, its temperature does not get affected by small amount of water. So, the temperature of air remains constant.

Thus, the average temperature of the air in the room at 20 min is 23°C.

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Everything else remained the same regardless of the price of a pencil, as stated by the law of supply. The supplied quantity of pencils would rise.

A shortage occurs, resulting in a higher equilibrium price, when demand rises while supply stays the same. On the off chance that request diminishes and supply stays unaltered, an excess happens, prompting a lower balance cost.

Since the prices of wood, graphite, and rubber all rise, the supply curve (S0) for pencils shifts to the left. This will cause the supply curve for pencils to shift to the left.

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Answer:

0 seconds its jst zero seconds

Answer:

A

Explanation:

Answer: a or e

Explanation:

Answer:

      I =  \(\frac{1}{4\pi \ r^2}\)

we see the intensity decreases with the inverse of the distance squared

Explanation:

Intensity is defined as power per unit area,

           I = P / A

in this case we have that the sound is emitted in a spherical form therefore the area is

           A = 4 pi r2

therefore the intensity is

          I =  \(\frac{1}{4\pi \ r^2}\)

as we see the intensity decreases with the inverse of the distance squared

Answer:Obtuseness of psychical iodine

Explanation:

gamma ray acuteness eventually have an obtuse effect on physical iodine meaning due to the phthagoras theorem the calculus formula would work

Answer:

4.545454 seconds

Explanation:

1500/330=4.545454 seconds

Answer:

4.5

Explanation:

the whole number 4.54 repeating

Energy conservation is the principle that energy is neither created nor destroyed, but can only be converted or transferred. It involves using energy-efficient appliances and transitioning to renewable energy sources to reduce consumption and environmental impact.

Energy conservation refers to the principle that energy cannot be created or destroyed; it can only be converted from one form to another or transferred between systems. This principle is based on the law of conservation of energy, also known as the first law of thermodynamics. In other words, the total amount of energy in a closed system remains constant over time.

One example of energy conservation is the use of energy-efficient appliances in households. By using appliances that are designed to minimize energy waste, such as energy-saving light bulbs, efficient refrigerators, or insulated windows, individuals can reduce their energy consumption and lower their electricity bills. These appliances are designed to convert electrical energy into useful forms, such as light or heat, with minimal energy losses.

Additionally, energy conservation plays a crucial role in sustainable practices and environmental preservation. For instance, reducing reliance on non-renewable energy sources like fossil fuels and transitioning to renewable energy sources such as solar or wind power helps conserve natural resources and reduces greenhouse gas emissions.

In summary, energy conservation is the principle that states energy cannot be created or destroyed but can only be converted or transferred between different forms. By adopting energy-efficient practices and utilizing renewable energy sources, individuals and society can contribute to conserving energy and mitigating environmental impact.

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The question probable may be:

Explain the concept of energy conservation and provide an example of how it applies in real-life situations.