a disk turns through 41 rev as it slows from an angular speed of 1.7 rev/s to a stop. assume its angular acceleration is constant. how much time did it take for the disk to stop?

Electrons are released as a result of the photoelectric effect when electromagnetic radiation, such as light, strikes a metallic surface.

1) The elastic collision (conserves mechanical energy) between the photon of light and the metal's electron that occurs in the photoelectric effect is in accordance with a particle theory of light.

2) When a light with a specific frequency hits a metal's surface, electrons are emitted from the metal. This phenomenon is known as the photoelectric effect, and the ejected electrons are referred to as photoelectrons.

3) Diffraction causes light to bend and spread over the screen when it passes through a slit, creating a recognizable banded pattern. This phenomenon is known as interference of light. New dark regions emerge as light passes between two slits.

4) As a wave, light travels to the earth. It doesn't require any medium or material to convey its energy forward, unlike sound waves or water waves. This implies that light can go through a vacuum.

5) Energy comes in the form of light, which has two different characteristics. This indicates that light has both particle nature and wave nature.

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\(Work=Force \: × \: displacement \\ => W=Fs \\ \\ Given, \\ Force=25 \: N \\ Displacement=2m \\ \\ so \: work = 25 \: N \: \times 2m \\ = > work = 25kgm {s}^{ - 2} \times 2m \\ = > work = 50kg {m}^{2} {s}^{ - 2} \\ = > work = 50J\)

This is the answer.

Hope it helps!!

A weightlifter must exert 25 Newtons of force to lift a set of barbells 2 meters off the ground, the weightlifter did 50 Nm of work on the barbells when he lifted them. The correct option is A.

To calculate the work done by the weightlifter in lifting the barbells, we can use the formula:

Work = Force × Distance

Here, it is given that:

Force = 25 Newtons

Distance = 2 meters

Substituting the values into the formula:

Work = 25 N × 2 m

Calculating the multiplication:

Work = 50 Nm (Newton-meters)

Thus, the weightlifter did 50 Nm of work on the barbells when he lifted them, the correct answer is A. 50 Nm.

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A frictional torque is exerted on a platform while it rotates because the force is along it's axis and changes only the magnitude and not the direction of the angular velocity.

A frictional torque is a rotational force that is caused by the movement of two objects that are in contact.

To collect data needed to find the frictional torque exerted on the platform while it rotates the experimental procedure the student should use include the following:

The quantities that should be measured is that rotational frictional force and angular velocity.

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Answer: If the cue ball strikes a stationary billiard ball straight on, then the cue ball will stop moving after the collision. It will have transferred all of its kinetic energy to the other ball, which will move forward with the same velocity that the cue ball had before the collision.

Explanation:

The refractive index of the mystery substance is n2 = 2.17.

Refractive index is a physical quantity that describes how light interacts with a particular material. It is defined as the ratio of the speed of light in a vacuum to the speed of light in the material. Refractive index is an important factor in optics, as it determines how much light is bent or refracted when it enters a material, and the angle at which it is refracted. Refractive index is also used to measure the thickness of a material or to calculate the index of refraction of a material. It is also used to determine the refractive properties of gemstones, for example in gemology.

The refractive index of the mystery substance (n2) can be calculated using Snell's law, which states that n1*sin(01) = n2*sin(02).
Therefore, n2 = n1*sin(01)/sin(02) = 1.33*sin(43°)/sin(22°) = 2.17
This means that the refractive index of the mystery substance is n2 = 2.17.

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Answer: No force is required to keep the mass moving at a constant velocity (on a frictionless surface) and in the same direction

Explanation:

Tricky question!  

The force required to slow the moving mass down to a rest is F = ma

F = (6 kg) x ((0 - 8m/s)/(3 s)) = 16 N (force in opposite direction of motion)

To keep the 6 kg mass which is already moving at a velocity of 8 m/s going in the same direction at the same velocity, no force (F=0) is applied, due to Newton's 1st Law of Motion.  This assumes a frictionless surface.

Answer:

what is this ???✔️✔️✔️

Explanation:

plz give explanation i don't understand ✔️✔️

Answer:

Flammability.

Explanation:

I took the test.

After the switch is closed, the plate of the capacitor that eventually becomes positively charged depends on the configuration of the circuit. There are two possible configurations: series and parallel.

Therefore, in both series and parallel configurations, the plate connected to the positive terminal of the voltage source eventually becomes positively charged. The charge on the capacitor builds up gradually until it reaches its maximum value determined by the voltage source and the capacitance of the capacitor.

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RS is a composition of rotation and reflection in the Euclidean plane E². The precise description of RS depends on the specific properties of the rotation R and reflection S.

In general, if R and S have the same axis or line of symmetry, the composition RS results in a translation. If R and S have intersecting lines of symmetry, RS yields a glide reflection. If R and S have perpendicular lines of symmetry, RS produces a rotation.

It is important to consider special cases, such as parallel lines of symmetry, coinciding axes, or perpendicular lines of reflection, as they may lead to different outcomes. The classification of isometries in E² involves understanding how rotations and reflections combine to create different transformations in the plane.

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In order of increasing frequency, the regions of the electromagnetic spectrum are as follows: infrared, microwave, visible, and gamma.

Starting with infrared, it has lower frequencies than the other regions mentioned. It lies just below the visible spectrum and is associated with heat radiation. Microwaves have slightly higher frequencies and are commonly used in communication and cooking applications.

Next, the visible spectrum encompasses the range of frequencies that our eyes can perceive. It includes the colors of the rainbow, from red (lower frequency) to violet (higher frequency). The visible spectrum plays a vital role in our perception of the surrounding world.

Finally, gamma rays have the highest frequencies in the list. They are associated with extremely energetic phenomena, such as nuclear reactions and high-energy particle interactions. Gamma rays have wavelengths shorter than X-rays and possess immense penetrating power.

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Answer:

K.E =1÷2M×V^2

= 1÷2×0.05×(400)^2

= 4000

Explanation:

Answer:

No

Explanation:

Density determines whether an object sinks or float. if the object is less dense than the medium in which it was submerged, it will float. for example, when you pour oil in water, it floats because water is denser than oil.

Answer:

D. A negative externality.

Explanation:

Particulate pollution is a form of pollution that is responsible for the degradation of the environment.

Particulate matter is also referred to as particle pollution or atmospheric aerosol particles and it can be defined as a complex microscopic mixture of liquid droplets and solid particles that are suspended in air.

An externality is typically an unwarranted cost or benefit by a manufacturer or producer of goods and services that affects a third party.

In Economics, an externality could either be positive or negative depending on its effect on a third party.

A negative externality arises when the production or consumption of a finished product or service has negative impact (cost) on a third party.

In conclusion, air pollution is an example of a negative externality because it causes harm to a third party.

To determine the number of half-lives that have elapsed, we need to compare the ratio of 14C to 14N atoms found in the hip bone fragment.

The ratio of 1 14C atom for every 31 14N atoms suggests that the hip bone fragment contains a smaller amount of 14C compared to the expected ratio found in a living organism. Since 14C undergoes radioactive decay with a half-life of approximately 5730 years, we can calculate the number of half-lives that have elapsed by observing how many times the ratio needs to double to reach the expected ratio.

In this case, if the expected ratio is 1:1, then the observed ratio of 1:31 would require five doublings to reach 1:1. Therefore, approximately five half-lives have elapsed since the death of the organism from which the hip bone fragment originated.

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Answer:

Explanation:

2) From F=ma

Force =15×40=600N or kgm/s2

3)From the same equation making acceleration the subject of the formula will give

a=f÷m

=24÷4=6m/s2

4)m=f÷a

=45÷15=3kg

The period of motion of a 26 g block oscillating on a 3.4 cm stretched vertical spring is calculated.

The period of motion of the block on the spring can be calculated using the formula T = 2π√(m/k), where T is the period, m is the mass of the block, and k is the spring constant.

To find k, we can use the equation k = F/x, where F is the force exerted by the spring and x is the displacement of the spring from its equilibrium position.

Since we know that the spring stretches 3.4 cm with a 15 g object, we can calculate the force to be 0.147 N.

Using this force and the displacement of the spring caused by the 26 g block, we can find the new value of k.

Then, plugging in the values of m and k into the period formula, we get a period of 0.692 seconds.

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Answer:c

Explanation:c

This question involves the concepts of the time period, orbital radius, and gravitational constant.

The theoretical period of the moon is "658 hr".

The theoretical time period of the moon around the earth can be found using the following formula:

\(\frac{T^2}{R^3}=\frac{4\pi^2}{GM}\)

where,

T = Time Period of Moon = ?

R = Orbital Radius = 3.84 x 10⁸ m

G = Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

M = Mass of Earth = 5.97 x 10²⁴ kg

Therefore,

\(\frac{T^2}{(3.84\ x\ 10^8\ m)^3}=\frac{4\pi^2}{(6.67\ x\ 10^{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)}\\\\T^2=(9.91\ x\ 10^{-14}\ s^2/m^3)(56.62\ x\ 10^{24}\ m^3)\\\\T=\sqrt{561.34\ x\ 10^{10}\ s^2}\)

T = 2.37 x 10⁶ s\((\frac{1\ h}{3600\ s})\)

T = 658 hr

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The attached picture shows the derivation of the formula for orbital speed.

Answer:

34

Explanation:

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Explanation:

The device that is not used to effectively fly lower more stable approach speeds is a. Winglets.

Vortex generators and trailing edge flaps are both used to improve low-speed performance and stability by manipulating the airflow over the wings. Vortex generators produce small vortices that help to energize the boundary layer and prevent airflow separation while trailing edge flaps increase the lift generated by the wing by increasing its camber. Both of these devices can help to improve the aircraft's ability to take off and land at lower speeds and with greater control. Boundary layer control involves using active methods such as suction or blowing to maintain a thin boundary layer and reduce drag. This can improve performance at low speeds by reducing the separation of the airflow from the wing and decreasing the drag on the aircraft. Winglets, on the other hand, are vertical extensions at the wingtips that reduce the drag generated by wingtip vortices at higher speeds. By reducing the drag, winglets can improve fuel efficiency and range, but they do not significantly affect the approach speeds or low-speed performance of the aircraft.

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The tangential speed of a point on the Ferris wheel is approximately 2.01 m/s.  the magnitude of the centripetal acceleration of a point on the Ferris wheel is approximately 0.106 m/s².

The tangential speed of a point on the Ferris wheel is given by the formula:

v = (2πr) / T

where v is the tangential speed, r is the radius of the Ferris wheel (half the diameter), and T is the time taken to complete one revolution.

In this case, the diameter of the Ferris wheel is 76 m, so its radius is 38 m. It completes one revolution every 20 min, so the time taken is T = 20 min = 1200 s. Substituting these values in the formula, we get:

v = (2π × 38 m) / 1200 s

≈ 2.01 m/s

The centripetal acceleration of a point on the Ferris wheel is given by the formula:

a = v² / r

where a is the magnitude of the centripetal acceleration, v is the tangential speed, and r is the radius of the Ferris wheel.

In this case, we have already calculated the tangential speed to be approximately 2.01 m/s, and the radius of the Ferris wheel is 38 m. Substituting these values in the formula, we get:

a = (2.01 m/s)² / 38 m

≈ 0.106 m/s²

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1 ) The ratio of the speed of A after moving a distance 2d to the speed of A after moving a distance d is sqrt(2), which means that the speed of A after moving a distance 2d is about 1.4 times the speed of A after moving a distance d.

2 ) the force applied to both gliders is the same, they both gain the same amount of kinetic energy. However, since the mass of B is greater than the mass of A, its final velocity after being pulled a distance d will be less than that of A. Therefore, the kinetic energy of B will be less than that of A after they have both been pulled a distance d.

1 )      The net work done on glider A in moving through a distance 2d is twice the net work done in moving through a distance d. This is because work is directly proportional to the distance over which the force is applied, and the force remains constant in this scenario. Therefore, if the distance is doubled, the work done is also doubled.

The ratio of the speed of A after moving a distance 2d to the speed of A after moving a distance d can be found by using the work-energy theorem, which states that the net work done on an object is equal to its change in kinetic energy. Assuming A starts from rest, the initial kinetic energy is zero, and the work done is equal to the final kinetic energy:

W = ΔKE

where W is the work done, and ΔKE is the change in kinetic energy.

The work done in moving A a distance d is:

W1 = Fd

where F is the force exerted on A by the string. The kinetic energy of A after moving a distance d is:

KE1 = W1 = Fd

The work done in moving A a distance 2d is:

W2 = 2Fd

The kinetic energy of A after moving a distance 2d is:

KE2 = W2 = 2Fd

The ratio of the speed of A after moving a distance 2d to the speed of A after moving a distance d can be found by equating the kinetic energy expressions:

2Fd = 1/2mv^2, where m is the mass of A and v is the final velocity of A after moving a distance 2d.

Fd = 1/8mv^2, where m is the mass of A and v is the final velocity of A after moving a distance d.

Dividing the second equation by the first, we get:

v2/v1 = sqrt(2)

Therefore, the ratio of the speed of A after moving a distance 2d to the speed of A after moving a distance d is sqrt(2), which means that the speed of A after moving a distance 2d is about 1.4 times the speed of A after moving a distance d.

2)     The work done on both gliders B and A is the same since the force applied to them is the same. However, the kinetic energy of B is greater than that of A after each has been pulled a distance d. This is because the kinetic energy of an object is directly proportional to the mass of the object and the square of its velocity, according to the formula KE = 1/2mv^2.

Since the force applied to both gliders is the same, they both gain the same amount of kinetic energy. However, since the mass of B is greater than the mass of A, its final velocity after being pulled a distance d will be less than that of A. Therefore, the kinetic energy of B will be less than that of A after they have both been pulled a distance d.

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Answer:

The angle of refraction is approximately 17.41 degrees.

Explanation:

To find the angle of refraction, we can use Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the indices of refraction of the two media.

The formula is:

n₁ * sin(θ₁) = n₂ * sin(θ₂)

Given:

n₁ (index of refraction of air) = 1

n₂ (index of refraction of diamond) = 2.42

θ₁ (angle of incidence) = 45 degrees

Substituting the values into the formula, we have:

1 * sin(45°) = 2.42 * sin(θ₂)

sin(45°) is equal to √2 / 2, so the equation becomes:

(√2 / 2) = 2.42 * sin(θ₂)

Now we can solve for sin(θ₂):

sin(θ₂) = (√2 / 2) / 2.42

sin(θ₂) ≈ 0.2901

To find the angle of refraction, we take the inverse sine (sin⁻¹) of the value:

θ₂ ≈ sin⁻¹(0.2901)

θ₂ ≈ 17.41 degrees

Therefore, the angle of refraction is approximately 17.41 degrees.

In both the cases gravitational potential energy is same.

Gravitational potential energy is energy an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the surface of the Earth where the gravitational acceleration can be assumed to be constant at about 9.8 m/s².

Given two cases height of the top is 3 ft so the potential energy is same as potential energy is dependent on height of the ball.

In both the cases gravitational potential energy is same.

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a solid sphere with mass m and radius, calculate the rotating angular momentum to linear angular momentum ratio. So, the aforementioned strategy is appropriate. = 2.4 J

Determine has a number of popular synonyms, including resolve, decide, rule, and settle. All of these phrases refer to "coming to or causing to come to conclusions," but the word "determine" refers to settling on something's identity, style, scope, or direction. identified the issue's root source.

Calculation

Kinetic energy

According to the question,

Total Kinetic energy, KE' = 8.4 J

Mass, m  = 3 kg

Center of mass's velocity, v = 2 m/s

Now,

KE(trans) = mv²

By substituting the values,

              =   × 3 × (2)²

              =  × 3 × 4

              = 6 kgm³/s² or,

              = 6 J  

We know the relation,

→ KE(rot) = KE(total) - KE(trans)

By putting the values,

             = 8.4 - 6

             = 2.4 J

Thus the approach above is correct.  

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The angular separation is \(4.88 * 10^{-5} rad\)

What is angular distance formula?

The formula is θ=s/r, where, θ is Angular Displacement, s is the distance traveled by the body, and. r is the radius of the circle along which it is moving.

What is meant by angular resolution?

The angular resolving power (or resolution) of a telescope is the smallest angle between close objects that can be seen clearly to be separate. Resolution is limited by the wave nature of light.

The angular separation is calculated as given below.

θ = 1.220 λ/d

Where λ  is the wavelength and d is the diameter of the lens aperture.

θ1 = \(1.220 * \frac{600 * 10^{-9} }{1.5 * 10^{-2} }\)

    =  4.88 × \(10^{-5}\) rad

Therefore, The angular separation is 4.88 × \(10^{-5}\) rad.

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Answer:

wave length is 1.2m

Explanation:

since formula of wave length is v/f

v(speed of sound in air at stp is 300ms^-1)

f(frequency 250hertz)

then wave length is 300÷250 which give 1.2m

Sound waves with a constant frequency of 250 hertz are traveling through air at stp. what is the wavelength of the sound waves is 1.32 m.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave.

speed of the wave,

c = νλ

330 m/s = 250λ

λ = 330/250 = 1.32 m

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