what is commutation? how can a commutator convert ac voltages on a machine’s armature to dc voltages at its terminals?

Answer: 4K1

Explanation:

The frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.

Explanation:-

Given:

Emitted frequency of light, f = 5.000 x 10^14 Hz,

Speed of the galaxy receding from Earth, v_src = 4500 km/s.

We need to convert the speed of the galaxy from km/s to m/s:

v_src = 4500 km/s * (1000 m/km)

v_src = 4.5 x 10^6 m/s

Plugging the given values into the Doppler effect formula:

f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s + 0 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)

Simplifying the expression:

f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)

f' ≈ 4.988 x 10^14 Hz

Therefore, the frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.

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The boat is initially at equilibrium since it seems to start off at a constant speed of 5.5 m/s. If the wind applies a force of 950 N, then it is applying an acceleration a of

950 N = (2300 kg) a

a = (950 N) / (2300 kg)

a ≈ 0.413 m/s²

Take east to be positive and west to be negative, so that the boat has an initial velocity of -5.5 m/s. Then after 11.5 s, the boat will attain a velocity of

v = -5.5 m/s + a (11.5 s)

v = -0.75 m/s

which means the wind slows the boat down to a velocity of 0.75 m/s westward.

Answer:

1.d

2.d

3.c

4.c

Okay, d & d, c & c. Iknow what you're thinking, I guessed. Nope! I just took a good look and chosed what I thought was the best answer

Explanation:

Have a great day! Byeeee

The magnification is -1.33 and the image height is -0.0931 m.

When an object is placed in front of a converging lens, an image is formed on the opposite side of the lens. The magnification of the image is given by the ratio of the height of the image to the height of the object. In this case, the object has a height of 0.070 m and is placed at a distance of 0.230 m in front of the lens. The lens has a focal length of 0.130 m.
To find the magnification, we can use the formula:
magnification = \frac{-image distance }{object distance}
We know that the object distance is 0.230 m and the focal length of the lens is 0.130 m. Using the lens formula

(\frac{1}{f} = \frac{1}{do} + \frac{1}{di}), we can find the image distance:

\frac{1}{0.130} = \frac{1}{0.230} +\frac{ 1}{di}
di = 0.306 m
Substituting the values, we get:
magnification =\frac{ -0.306 }{0.230} = -1.33 (negative sign indicates that the image is inverted)
To find the image height, we can use the magnification formula:
magnification =\frac{ -image height }{ object height}
Rearranging the formula, we get:
image height = magnification * object height
Substituting the values, we get:
image height = -1.33 * 0.070 = -0.0931 m (negative sign indicates that the image is inverted and smaller in size)

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The mass of the aeroplane is 300,000 kg.

It states that the force F is directly proportional to the acceleration a of the body and its mass.

The law is represented as

F =ma

where acceleration a = velocity change v / time interval t

Given is the aeroplane lands at a speed of 80 m/s. After landing, the aeroplane takes 28 s to decelerate to a speed of 10 m/s. The mean resultant force on the aeroplane as it decelerates is 750 000 N.

The force expression will be

F = mv/t

Substitute the values and we have

750000 = m x  (80 -10)/ 28

750,000 = m x 2.5

m = 300,000 kg

Thus, the mass of the aeroplane is 300,000 kg.

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Answer:

This can be explained by the equation Force=Mass x Acceleration. Vehicle 2 has a higher acceleration than Vehicle 1, which means it accelerates quicker. However, this increased acceleration is achieved by a less forceful engine. This is possible because Vehicle 2 has a lower mass than Vehicle 1, meaning the same force applied to Vehicle 2 results in greater acceleration. Therefore, Vehicle 2 has a greater acceleration than Vehicle 1 but has a less forceful engine.

Explanation:

Efficiency is a way of describing the amount of useful ​output​ a process or machine can generate as a percentage of the ​input​ required to make it go. In other words, it compares how much energy is used to do work versus how much is lost or wasted to the environment. The more efficient the machine, the less energy wasted.

For example, if a heat engine is able to turn 75 percent of the fuel it receives into motion, while 25 percent is lost as heat in the process, it would be 75 percent efficient. Out of the original 100 percent of the fuel, 75 percent was output as useful work.  

the equation:

energy efficiency =useful output energy/total input energy

Answer:

B. I DID IT AND GOT IT RIGHT

Explanation:

Answer:

It is B

Explanation:

i did this one

The answer is the stars are incandescent sources, where peak radiation frequency is proportional to stellar temperature.

The color of starlight is dependent on incandescence while the color of light from the signs is based on fluorescence.

What is the color of starlight?

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Answer:

5 seconds

Explanation:

Answer:

5 seconds

Explanation:3=1   6=2 9=3 12=4 15=5       15 equal 5 mean 15 meters in 5 sec

when 4n is applied for 3 sec , then impulse is 12, similarly when 15n is applied for just one second , then impulse is 15.

Impulse is nothing but the sudden amount of force is applied for the small amount of time duration, and the value of the impulse is product of the force nd time.

P = Ft

so calculating for the first part of the question,

impulse will be = 4x3 = 12

and for second part of the question,

impulse will be = 15x1 = 15

Hence the two impulse will be 12 and 15.

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Scientists get their evidence through scientific methods such as observation and performing experiments.

This is referred to as a part of a scientific method and it is performed by scientists to test a hypothesis so as to know whether it will be accepted or refuted.

This helps scientists to gather information from the various results gotten and the use of our sense organs such as nose etc to observe the various happenings is also a method in which scientists get their evidence. They also use models to study how certain processes occur so as to get the accurate data.

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Force applied is directly proportional to displacement.

It is given by the formula

Here F is the force , k is the spring constant , x is the displacement.

Substituting the values,

answered

and successful (4th rate)

The mass of the remaining ice in the jar is 79.6 g.

to calculate the mass in grams we need to know when the tea reaches an equilibrium temperature of 32.6°C, it means that the heat gained by the tea from the sunlight is equal to the heat lost by the tea to the surroundings.

Let's denote the initial temperature of the tea as T1 and the final temperature as T2. The heat gained or lost by an object can be calculated using the equation Q = mcΔT, where Q is the heat, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

In this case, the tea has a mass of 176 g and the specific heat capacity of water is 4186 J/kg°C. The heat gained by the tea is equal to the heat lost by the ice. The mass of the ice is 135 g, and its temperature is 0.0°C. The final temperature of the tea is 28.4°C.

To find the mass of the remaining ice, we can set up the equation: (mass of tea) * (specific heat capacity of water) * (ΔT of tea) = (mass of ice) * (specific heat capacity of water) * (ΔT of ice). Plugging in the given values, we can solve for the mass of the remaining ice. The mass of the remaining ice in the jar is 79.6 g.

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Combining elements into a compound can produce a new compound which is a mixture of the mixed elements.

A mixture in chemistry is a term used to denote the combination of two or more elements, which may or not conserve their original physical and chemical properties after forming a new combination.

Therefore, with this data, we can see that a mixture is caused by the combination of two or more elements in order to form a new which may or not preserve the original characteristics of these elements.

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Since we assume that the entire lower surface of the bed makes contact with the floor it will exert 1.18*10^4 N of force.

Solution:

Find the volume of water filling the mattress:

V = (2.00 m)(2.00 m)(0.300 m)

   = 1.20 m^3

M = pV = (1000 kg/m^3) (1.20 m^3) = 1.20*10^3 kg

weight of the bed

Mg = (1.20*10^3) (9.8 m/s^2) = 1.18*10^4 N

The force perpendicularly applied to an object's surface divided by the area over which it is dispersed is known as pressure. The pressure as compared to the surrounding air pressure is known as gauge pressure. To express pressure, a variety of units are employed.

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The refracting telescope uses large lenses. The larger lenses increase the weight of the telescope. The weight of the refracting telescopes makes it difficult for the observer to keep them aligned.

Thus the correct answer is option b, refracting telescopes.

Answer:

Is Reflecting telescope

Explanation:

I took the test

The two major hazards of electricity are electric shock and fire.

Electric shock occurs when a person comes into contact with an electric current. This can result in serious injury or even death. The severity of the shock depends on the amount of current that passes through the body and the length of time the person is in contact with the current.

Fire is another major hazard of electricity. Electrical fires can be caused by faulty wiring, overloaded circuits, or the improper use of electrical appliances. These fires can quickly spread and cause extensive damage to property and can also result in injury or death.

It is important to take safety precautions when dealing with electricity to prevent these hazards from occurring. This includes using proper wiring and circuit breakers, avoiding overloading outlets, and following the manufacturer's instructions when using electrical appliances.

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Answer:

All of the inventors can be characterized as problem-solvers.

Explanation:

Took the practice

Answer:

All of the inventors can be characterized as problem-solvers.

Explanation:

Answer:

La respuesta es 16,041.66 M en términos de segundos.

Explanation:

Answer:

29,800.85 m/s or 2.98 x 10^4

Explanation:

1 mile is 1609.34 Meters

1 year is 31,536,000 seconds

1609.34 x 93,000,000 = radius in meters= 149,668,620,000

2 x pi x r = circumference and or distance traveled

2 x pi x 149,668,620,000

distance traveled / time it takes to travel the distance = speed or velocity

940,395,674,129.84 / 31,556,000 = 29,800.85 m/s or 2.98 x 10^4

Answer:

50m/s2

Explanation:

u=0m/s

a=10m/s

v=?

t=5s

v=u+at

=0+(10×5)

=0+50

=50m/s

Answer:

Explanation:

The current produced by a 9-volt battery flowing through a resistance of 0.2 ohms would be  45 Ampere.

Resistance is the obstruction of electrons in an electrically conducting material.

The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.

V=IR

As given in the problem we have to find the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms.

current produced by a 9-volt battery  = voltage /resistance

                                                              = 9 volt /0.2 ohms

                                                              = 45 Ampere

Thus, the current produced would be 45 Ampere.

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Answer: the average density of the combined world is 256/81 times the average density of the original two worlds.

Explanation:

The total mass of the two original worlds is 2M, and their average density is given by:

ρ0 = 2M/(4/3 πR^3) = 3M/(2πR^3)

The final radius of the combined world is 3/4R, so its volume is:

V = 4/3 π(3/4R)^3 = 27/64 πR^3

The mass of the combined world is still 2M, so its density is:

ρ = 2M/V = 128M/(27πR^3)

The ratio of the average density of the combined world to that of the original worlds is:

ρ/ρ0 = (128M/(27πR^3)) / (3M/(2πR^3)) = 256/81

The measure of angle 3 is given as 114 degrees

An angle is a geometric figure formed by two rays or lines that share a common endpoint called the vertex. The rays or lines that form the angle are referred to as the arms or sides of the angle. Angles are typically measured in degrees (°) or radians, and the measure of an angle indicates the amount of rotation between the two arms or sides, starting from one arm and rotating around the vertex to reach the other arm.

Line a and line b are parallel.

< 7 = 114°

The value of 3 measured as

= < 7

Having similar angles, = 114°

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