a student pulls on a rope to life a box of inertia m1. the rope goes around two pulleys and an additional box is in between the two pulleys on a frictionless surface as illstruted in the sketch. what is the minimal force

The LED is found to be emitting approximately 2.03 x 10¹⁶ photons per second.

The energy of a single photon of 440 nm light is given by,

E = hc/λ, Planck's constant is h, speed of light is c, and the wavelength of the light  λ. Plugging in the given values:

E = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s)/(440 x 10⁻⁹ m)

= 4.51 x 10⁻¹⁹ J

The power input to the LED is given by,

P = IV = (21 x 10⁻³ A)(3.0 V)

= 63 x 10⁻³ W

Since the LED is 71% efficient, the power output in the form of light is,

P_out = 0.71(63 x 10⁻³ W)

= 44.73 x 10⁻³ W

n = P_out / E

= (44.73 x 10⁻³ W) / (4.51 x 10⁻¹⁹ J/photon)

= 9.92 x 10¹⁵ photons/s.

This is the number of photons emitted per second per one side of the LED.

n_total = 2(9.92 x 10¹⁵ photons/s)

= 1.98 x 10¹⁶ photons/s

Therefore, the LED emits approximately 2.03 x 10¹⁶ photons per second.

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The oldest stars in the Galaxy (Population II stars, globular clusters) form a spherical halo around the Galaxy which leads astronomers to conclude that the protogalactic cloud (the cloud from which our galaxy formed) was roughly spherical.

Protogalactic cloud can be defined as, a protogalaxy, which could also be called a "primeval galaxy", is a cloud of gas which is forming into a galaxy.

A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy (spherical) than a spiral galaxy.

The higher gas density forms stars more efficiently, so all the gas is converted into stars before a disk can form. This is why a dense cloud can more likely to produce an spherical galaxy.

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Here the focal length of the convex mirror as -12 cm, a light bulb with a diameter of 6 cm is placed 60 cm from the mirror. Hence, the image distance is -60 cm, and the image height is 6 cm.

To find the image distance and height, we will use the mirror formula for a convex mirror, which is given as follows;1/f = 1/v + 1/u. Where, f = focal length of the convex mirror;

v = the image distance;

u = the object distance

If the object distance is positive, it means the object is placed in front of the mirror, and if it is negative, it means the object is placed behind the mirror. The focal length of a convex mirror is always negative, as given above.

Therefore, u = -60 cm and f = -12 cm.

Plugging in the values in the mirror formula, we get:1/-12 = 1/v + 1/-60=> -5/60 = 1/v - (1/60) => -5/60 = (60 - v)/60=> v = -300/5= -60 cm

The image distance is -60 cm, which means the image is virtual and erect. The negative sign indicates that the image is formed behind the mirror.

To find the image height, we use the magnification formula:

m = -v/u= -(-60)/(-60)= 1

The magnification is 1, which means the image is of the same size as the object. The height of the light bulb is 6 cm, so the height of the image will also be 6 cm.

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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:

I am pretty sure that it is A. The Sun and all the planets revolve around Earth. Hope this helps!!!!!

Explanation:

From the given list, let's determine the given qualitative information.

Qualitative data can be said to be data that are represented without determining a value.

This type of data are uncountable.

It is data that can be observable in nature and they cannot be measured.

From the given list, the qualitative data is blue sky.

Other information given are that of quantitative data because they are measured values.

Therefore, the qualitative information is blue sky.

ANSWER:

D. Blue sky

The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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The current in the tile is 0.11 ampere.

The rate of electron passage in a conductor is known as electric current. The ampere is the electric current's SI unit. Due to not following vector law of addition, current is  a scalar quantity.

Given parameters:

Potential difference: V = 40 V.

The power output: P = 4.4 W.

We have to find, the current in the tile; I =?

We know that, power output = current × Potential difference

So, the current in the tile = power output /Potential difference

= 4.4/40 ampere.

= 0.11 ampere.

Hence the current in the tile is 0.11 ampere.

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Answer:

Alot of god dam rabbits

Explanation:

Answer:

million rabbits becauseeverything

Explanation:

longitudinal wave .

they are composed of rarefaction and compression

there is change of pressure variations through medium

there is change in density throughout the medium

they can be propagated in liquid soild and gasses

example sound wave

transverse wave

they are composed of troughs and Crest

there is no pressure variations throughout the medium

there is no change in density

they can propagated in liquid soild but not gases

example light wave

Answer:

D. Electric energy into mechanical energy

Explanation:

hope it helps

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Answer:

Approximately \(14\; {\rm m\cdot s^{-1}}\).

Explanation:

The gravitational potential energy \(\text{GPE}\) of this roller coaster is proportional to the height \(h\) of the roller coaster.

The kinetic energy \(\text{KE}\) of this roller coaster is proportional to the square of speed \(v\).

The question states that the track is frictionless. Thus, during the descent, the \(\text{GPE}\) of this roller coaster is turned into \(\text{KE}\) without any energy loss.

When the roller coaster was at \((1/2)\) of the the initial height, only\(1 - (1/2) = (1/2)\) of the original \(\text{GPE}\) was turned into \(\text{KE}\). The \(\text{KE}\!\) of this roller coaster at that height would be \(1 - (1/2) = (1/2)\!\) of the \(\text{KE}\!\!\) when the roller coaster is at the ground level.

The \(\text{KE}\) of the roller coaster is proportional to \(v^{2}\) (the square of speed \(v\).) Thus, since the \(\text{KE}\!\) at \((1/2)\) the initial height is \(1 - (1/2) = (1/2)\!\) the \(\text{KE}\!\!\) at the ground level, the \(v^{2}\) at \((1/2)\!\) the initial height would also be \(1 - (1/2) = (1/2)\!\) the \(v^{2}\!\) at the ground level.

Since \(v = 20\; {\rm m\cdot s^{-1}}\) at the ground level, \(v^{2} = (20\; {\rm m\cdot s^{-1}})^{2}\) at the ground level. The \(v^{2}\) at \((1/2)\) the initial height would then be:

\((1 - (1/2))\times (20\; {\rm m\cdot s^{-1}})^{2}\).

Thus, the speed \(v\) at \((1/2)\) the initial height would be:

\(\begin{aligned}& \sqrt{(1 - (1/2))\times (20\; {\rm m\cdot s^{-1}})^{2}} \\ =\; & \sqrt{\frac{1}{2} \times (20\; {\rm m\cdot s^{-1}})^{2}} \\ =\; & \sqrt{200}\; {\rm m\cdot s^{-1}} \\ \approx\; & 14\; {\rm m\cdot s^{-1}}\end{aligned}\).

Momentum is increased by a factor of 2.

The momentum of an object is defined as the product of its mass and velocity.

Therefore, the magnitude of its momentum is directly proportional to the speed of the object.

When the kinetic energy of an object is increased by a factor of 4, its speed must also increase.

The relationship between kinetic energy and speed is given by the equation KE = 1/2\(mv^2\), where m is the mass of the object and v is its velocity.

Doubling the speed of the object would result in an increase in kinetic energy by a factor of 4.

Therefore, the magnitude of its momentum would also increase by a factor of 2.

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The synchronous speed of the motor would be 100 RPM.

To calculate the synchronous speed of a 24-pole three-phase synchronous motor operating at 20 Hz, you can use the following formula:

Synchronous Speed (Ns) = (120 * Frequency) / Number of Poles

By plugging in the given values:

Ns = (120 * 20 Hz) / 24 poles

Ns = 2400 / 24

Ns = 100 RPM

So, the synchronous speed of the motor would be 100 RPM.

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The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases.  As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.

Answer:

Writing Electron Configurations. When writing an electron configuration, first write the energy level (the period), then the subshell to be filled and the superscript, which is the number of electrons in that subshell. The total number of electrons is the atomic number, Z

The momentum of the car, given the data d from the question is 0.0462 Kg.m/s

Momentum is defined as the product of mass and velocity. It is expressed as

Momentum = mass × velocity

With the above formula, we can determine the momentum of the car. Details below

The momentum of the car can be on rained as follow:

Momentum = mass × velocity

Momentum of car = 0.03 × 1.54

Momentum of car = 0.0462 Kg.m/s

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Newton's Second Law of Motion states that the net force acting on an object is directly proportional to its acceleration. The proportionality constant, which is the object's mass, gives the equation ma = f (force equals mass times acceleration). This means that if a force is applied to an object with a certain mass, it will accelerate proportionally to the magnitude of the force.

Applying Newton's Second Law of Motion allows us to determine the force required to move an object of a certain mass a certain distance. We can also use it to calculate the acceleration of an object given its mass and the force acting on it. The second law states that the acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. If the mass of the object remains constant, the acceleration produced is directly proportional to the force applied.

The second law also tells us that if a net force is acting on an object, it will accelerate in the direction of that force. This law can be used to explain the motion of objects in both linear and rotational motion. For example, when a bat hits a ball, the force of the bat on the ball causes it to accelerate, and the ball moves in the direction of that force. In summary, applying Newton's Second Law of Motion is a powerful tool for understanding the motion of objects and how they respond to forces acting on them.

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One statement that is not true is that UV radiation is a type of electromagnetic radiation. It is also a type of ionizing radiation. UV radiation is actually a form of non-ionizing radiation.

UV radiation, or ultraviolet radiation, is a type of electromagnetic radiation that falls between visible light and X-rays on the electromagnetic spectrum. It is often categorized into three types: UVA, UVB, and UVC. Unlike ionizing radiation, such as X-rays and gamma rays, which have enough energy to remove tightly bound electrons from atoms or molecules, UV radiation lacks the necessary energy to ionize atoms or molecules. Instead, it primarily interacts with the outermost electrons of atoms or molecules, leading to chemical reactions and causing biological effects.

UV radiation is commonly associated with sunlight and has various effects on living organisms and materials. It can cause sunburn, premature aging of the skin, and an increased risk of skin cancer. Exposure to excessive UV radiation can also damage the eyes and impair the immune system. It is important to protect oneself from excessive UV exposure by wearing sunscreen, protective clothing, and sunglasses.

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A collection of voltaic cells (or piles) is called a battery.

What are voltaic cells?

Voltaic cells are chemical cells that generate electricity.

A series of voltaic cells connected together in a steel container which produce current as a result of oxidation reduction reaction.

In a voltaic cell there are two compartments where oxidation and reduction occurs simultaneously to produce current.

In each compartment there is an electron. The positively charged electrode is cathode(reduction) and negatively charged in anode (oxidation).

In general, the steel container in which a redox reaction occurs inside a voltaic cell is called a battery.

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Answer:

natural is the answer

Friction is a natural force which exist

33 m, due west, is the worker's displacement from his truck.

The state of being displaced: the action or process of displacing. a storm that forced thousands of people to evacuate. Physics: the volume and weight of a fluid, such as water, that is moved by a floating object, such as a ship, of equivalent weight (see move sense 2a).

Replace, supersede, & supplant are some typical synonyms for the word "displace." Displace indicates an ousting and dislodging even if all of these terms imply "to put out of a customary or proper place and into the position of another." Thousands had been displaced by war.

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In total, 9,000 banks failed, wiping out $7 billion in assets from depositors. Additionally, there was no deposit insurance throughout the 1930s; this New Deal reform made it possible.

The Bank in New York went under in December of that year. The bank at the time had deposits totaling more than $200 million, making it the biggest single bank failure within American history.

The amount of products and services produced by the United States decreased by one-third from 1929 and 1933, the unemployment rate increased to 25% of the working population, the stock market lost 80% of its value, and over 7,000 banks failed.

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Answer:

-12.38 N

Explanation:

This question requires you to first find the acceleration then apply Newton's 2nd law of motion to find the force.

To find deceleration use the formula;

v²= u²+2ad ---where

v= final speed = 0 m/s

u= initial speed = 3.0 m/s

a= acceleration { in this case , deceleration} = ?

d= distance from the point where its passenger rolled off= 4.0 m

therefore ;

\(a=\frac{v^2-u^2}{2d}\)

\(a=\frac{0^2-3^2}{2*4} =\frac{-9}{8} m/s^2\)

Mass of the sled is calculated from its weight force.

Weight force = mg

mass of sled = weight force / g  where g= 10 m/s²

mass of sled = 110/10 = 11kg

The magnitude of horizontal net force will be : F= ma  where ;

m= mass of sled = 11 kg

a= deceleration = -9/8 m/s²

F = 11 * -9/8 = -12.38 N

Force is acting on the opposite direction of the initial motion of the sled.

The magnitude of the horizontal net force acting on the sled is 12.375 N.

Given data:

The initial speed of sled is, u = 3.0 m/s.

The final speed of sled is, v = 0 m/s.

The distance covered before stopping is, s = 4.0 m.

The weight of sled is, W = 110 N.

Using the Newton's second law, the net horizontal force acting on the sled is given as,

F = ma

here,

m is the mass of sled.

a is the acceleration of sled.

Mass is calculated from the weight as,

W = mg

110 = m (10)

m = 11 kg.

Now, using the second kinematic equation of motion to obtain the acceleration of sled as,

\(v^{2}=u^{2}+2(-a)s\\\\0^{2}=3^{2}+2(-a)4\\\\8a=9\\\\a=1.125 \;\rm m/s^{2}\)

Then the magnitude of net horizontal force is,

\(F = ma\\\\F = 11 \times 1.125\\\\F = 12.375\;\rm N\)

Thus, we can conclude that the magnitude of the horizontal net force is 12.375 N.

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Solar energy and terrestrial reradiation are usually measured in units of length called micrometers.

Radiometers are sensors that can be used to measure solar and terrestrial radiation. These sensors detect electromagnetic radiation and convert it into a measurable electrical signal. The energy that the sensor detects can be measured in units of length called micrometers (µm).

One common type of radiometer is a pyranometer, which measures the total amount of incoming solar radiation. Another type of radiometer is a pyrgeometer, which measures the amount of outgoing longwave radiation from the Earth's surface. Both of these sensors measure radiation in units of micrometers.

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Answer:

she can answer : which part of the magnet is said strongest at attracting iron & how fast does iron lose its magnetism?

Answer:

True

Explanation: