for a charged particle, a constant magnetic field can be used to change for a charged particle, a constant magnetic field can be used to change only the direction of the particle's velocity. only the magnitude of the particle's velocity. both the magnitude and direction of the particle's velocity. none of the above.

To explore Brown Dwarf, we'll utilize an infrared telescope.

Scientists can determine which galaxies are forming stars and where the stars are forming within those galaxies by observing ultraviolet light.

Brown dwarfs, according to McLean, "are so elusive and difficult to find." They are most easily identified in the infrared, but even there, they are quite challenging to find. These flimsy items emit a heat glow that we can see in the infrared.

The wavelengths of light waves range from roughly 400 to 700 nanometers (4,000 to 7,000 angstroms). Different light wavelengths are seen by our eyes as the colors of the rainbow.

Since fusion becomes feasible at a temperature of roughly 3 million degrees, brown dwarf core temperatures must be below this level. temperatures at the surface are 1,000 degrees Kelvin or less.

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A stater glides off a frozen pond onto a patch of ground at a speed of 3.1 m/S. Here she is stowed at a constant rate of 3.00 m/s .  The skater will move at a speed of v = 1.01 m/s , when she has slid 0.42 m across the ground

The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.

using kinematics equation

[tex]v^{2} - u^{2} = 2as[/tex]

[tex]v^{2} = u^{2}[/tex] + 2as

   = [tex](3.1)^{2}[/tex] - 2 * 3 * 0.42

v    = 1.01 m/s

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The phase angle between the voltages of the inductor and capacitor in a RLC series circuit is 180 degrees.

RLC circuit contains resistor , capacitor and inductor. Resistor doesn't store energy but capacitor and inductor stores energy and that is the reason resistor is called a passive element and inductor and capacitors are called active element.

Inductor leads the current by a phase angle of 90 degrees and the voltage across the capacitor lags the current by 90 degrees, so the phase difference between the voltages of the inductor and the capacitor is 180 degrees in an LCR circuit.

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Answer:

b) Concave mirror

Explanation:

The type of mirror being used in the image is concave mirror. Dentist always use concave mirror to see patient's teeth. Hence, the option (b) is correct answer.

Answer: b or

✔ concave

Explanation:

The ratio of turns in the primary and secondary coils of her transformer is 1.916

Primary voltage = 230v

secondary voltage = 120v

The ratio of turns in primary and secondary coils of transformer is given by,

Np/Ns = 230/120

           = 1.916

Transformer: a piece of equipment used to increase or decrease voltage while transferring electrical energy from one alternating-current circuit to another or several circuits. Transformers are used for a wide range of tasks, including lowering the voltage of traditional power circuits to operate low-voltage appliances like doorbells and toy electric trains and raising the voltage of electric generators to enable long-distance transmission of electrical power.

Transformers alter voltage using electromagnetic induction, which means that current is induced in a second coil known as the secondary as the magnetic lines of force (flux lines) build up and collapse with changes in current travelling through the primary coil. To determine the secondary voltage, multiply the primary voltage by the number-to-number ratio. Transformers are devices that convert electrical energy from a single alternating-current turn in the secondary coil to the number of turns in the main coil, a measurement known as the turns ratio.

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The maximum weight the rocket burn is 15000N or 15kN

Now in the question rocket burns the fuel at the rate 300g/s . we are supposed to deduce the maximum weight the rocket burn have if its going to move vertically upward.

As per Classical Mechanics , overall momentum of the system is conserved biding all conservational laws.

Force= mass x acceleration

F= m dv/dt

F=v dm/dt

v=500m/s

dm/dt=300

F=500 x 300

=15kN

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4.1510^-3 tesla the magnitude of the magnetic field required to make the electrons hit the top of the screen

v=0.7×10^8m/s

q=1.6×10^-19 C

B= ?

Voltage= 15,00 V

r= 20cm= 0.2 m

r=mVqB

B=mv/qr

B=4.1510^-3 tesla

To observe magnetic forces, one can utilize a magnetic field, an electric current, a changing electric field, or a vector field surrounding a magnet. Magnetic compass needles and other permanent magnets point in the general direction of magnetic fields resembling those on Earth. Electrically charged particles move in a helical or circular pattern in magnetic fields. Electric motors operate on this force, which is applied to electric currents in wires in a magnetic field.

Magnetic fields can be visualized as continuous lines of force or magnetic flux that travel from south to north magnetic poles. The lines' density reveals the magnetic field's strength. One or more of a magnet's poles are

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The magnitude of the RMS voltage output of the generator is 139.39 V.

The output voltage of a rotating circular coil is given by,

E = NBAW

Where,

E is the output voltage,

N is the number of the turns in the coil which is 450 in this case,

B is the magnitude of the magnetic field which is 0.32 tesla in this case,

A is the area of the circular ring,

W is the angular velocity of the coil which is 110 revolution/second.

A = πr²

A = π(0.053)²

A = 0.0088 m².

Putting values,

E = 450(0.32)(0.0088)(110)

E = 139.39 V.

So, the magnitude of the output voltage is 139.39 V.

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The impulse of given nail is -90 kg-m/s .

The average force acting on nail is 11250 N .

Considering that,

The hammer weighs 12 kg.

The hammer's initial speed when that strikes a nail is u = 7.5 m/s.

At last, it comes to rest when v = 0.

The time is t = 8ms = 0.008 s.

Let J be the impulse applied to the nail in (a). An item receives an impulse equal to a change within the momentum. It comes from:

J = m(v - u)

v = 0

J = -12kg x 7.5 m/s

J = -90 kg-m/s

The impulse is causing motion to move in the opposite direction.

The following provides another definition of impulse:

J = F X t

The average force pushing against the nail is F.

F = J / t

F = 90 kg-m/s / 0.008 s

F = 11250 N .

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The statements is true concerning a magnifying glass is it produces a virtual image.

A divergent lens or a convex mirror are used to create a virtual image. Finding a virtual image involves tracking actual rays that leave an optical tool back to their observed or apparent sources. A virtual image cannot be projected onto a screen because the rays never truly converge.

The mirror reflection is the best illustration of a virtual image. Real images are made when rays connect, but virtual images are made when rays diverge. On a screen, real images can be projected but virtual ones cannot. Two opposing lenses, concave and convex, are used to create real images.

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The electric field is radially outwards from positive charge and radially in towards negative point charge.

Any sort of charge causes an electric field to be associated to a location in space. The strength and direction of the electric field are expressed by the value of E, also referred to as the electric field strength, electric field intensity, or simply the electric field. The SI unit for the electrical field is volts per meter (V/m). This unit is equivalent to the Newtons per coulomb. Both Newton, which represents for force, and Coulomb, which stands for charge, are the ancestors of these units. These two are sometimes referred to as the sources of the field since they produce the magnetic field with moving charges (currents) and the electric field with stationary charges, respectively.

AV = EAX = (2.4*10N.X0.018) V/M

off = 432

N2V jk N.mm

1/2=12

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The acceleration of the car moving at the speed of 50 m/s and

completing one lap in the time of 73.5 seconds is 0.68 m/s²

The speed of the car = 50 m/s

The time taken to complete one lap = 73.5 s

The acceleration of the car can be found using the formula,

                      a = s / t

where a is the acceleration of the car

           s is the speed of the car

           t is the time taken to complete

Let us substitute the known values in the above equation, we get

                      a = 50 / 73.5

                         = 0.68 m/s²

Therefore, the acceleration of the car is 0.68 m/s²

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By using  Rayleigh criterion principle, we can calculate the Fundamental resolution limit would be 20.33 x [tex]10^{-9}[/tex] radians

The Rayleigh criterion for the diffraction limit to resolution states that two images are just resolvable when the center of the diffraction pattern of one is directly over the first minimum of the diffraction pattern of the other.

According to the Rayleigh criterion principle, we have

Ф = 1.22 λ/D

where Ф is the resolution limit in radians

λ = wavelength of the light

D = diameter of the lens or the telescope

putting  the appropriate values, we get

Ф  = 1.22 x 500 x [tex]10^{-9}[/tex] / 30

Ф   = 20.33 x [tex]10^{-9}[/tex] radians

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Intensity and time interval of a sound can be compared between the two ears to locate the source of a sound.

Intensity of the sound is defined as the proportion of energy that flows per unit time through a unit area perpendicular to the direction of motion of such sound waves.

The time it takes for a sound wave to complete one cycle is called its time interval or the time period.

A person's loudness perception is affected by the amount of sound they hear.

Therefore intensity and time interval can be considered as the sound characteristics to compare between the two ears to locate the source of a sound.

The question is incomplete, the complete question is:

'What sound characteristics can be compared between the two ears to locate the source of the sound?

a. sound shadows and frequency

b. frequency and amplitude

c. intensity and time of arrival

d. timbre and rhythm'

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Spraying an asphalt road with water will make it easier to walk across and bare feet on a hot sunny day because it has a high specific heat capacity.

This is referred to as the amount of heat which is required to raise the temperature of the unit mass of a given substance by a given amount.

Water as a compound has a very high specific heat capacity which means that it needs a high amount of heat for the temperature to change. This therefore means that when the water is sprayed on the surface, the road doesn't become too hot and can be walked on with the barefoot which makes it the correct reason.

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The speed of the object if a string is wrapped tightly around a fixed reel that has a rotational inertia of 0.0352 kg · m² and a radius of 12.5 cm after it has fallen 1.25 m is 1.97 m /s

∑ Fy = m ay

mg - T = ma

m = 423 g = 0.423 kg

g = 9.8 m / s²

( 0.423 * 9.8 ) - T = 0.423 a

4.15 - T = 0.423 a  → ( 1 )

τ = F * ⊥d

τ = I α

α = a / r

τ = Torque

F = Force

⊥d = Perpendicular distance

I = Moment of inertia

α = Angular acceleration

a = Tangential acceleration

r = Radius

I = 0.0352 kg m²

r = 12.5 cm = 0.125 m

F * ⊥d = I α

T * r = I a / r

T = I a / r²

T = 0.0352 a / 0.125²

T = 2.26 a   → ( 2 )

( 1 ) becomes,

4.15 - 2.26 a = 0.423 a

2.683 a = 4.15

a = 1.55 m / s²

v² = u² + 2 a s

v = Final velocity

u = Initial velocity

s = Distance

u = 0

s = 1.25 m

v² = 0 + ( 2 * 1.55 * 1.25 )

v² = 3.875

v = 1.97 m / s

Therefore, the speed of the object after it has fallen 1.25 m is 1.97 m / s

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By dividing the applied force by the sine of the angle and multiplying the result by the horizontal component of the tension force.

Any physical object that is in contact with another one can apply forces to that object. Depending on the types of objects in contact, we name these contact forces differently. We refer to the force as tension if a rope, string, chain, or cable is one of the objects applying the force.

The process of pulling water from a well is one of the clearest examples of tension forces. It makes use of a rope that is attached to the pulley with one end and the bucket handle with the other. When this rope is stretched by an external force, tension is produced.

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Pulleys are strong, efficient devices. They have the power to shift a force's direction, which makes it much simpler for us to move objects.

For the transmission of energy and motion, pulleys can be used alone or in conjunction. Sheaves are the name for rimmed pulleys with grooves. In a belt drive, pulleys are attached to shafts at their axes, and power is transferred between the shafts using endless belts that pass over the pulleys.

The four different types of pulleys are complex, compound, moveable, and fixed. A fixed and movable pulley make up compound pulleys.

The main benefit of using pulleys is that it requires less effort than simply lifting weights normally. To put it another way, it lessens the actual force needed to lift heavy objects. Additionally, the force's direction is altered.

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Transverse waves  are waves that move the medium at right angles to the direction in which the waves travel.

Waves are defined to be oscillations or vibrations about a fixed point, accompanied by the transfer of energy travelling from one medium to another. There are mainly two types of mechanical waves, namely longitudinal waves and transverse waves.

Longitudinal waves are waves in which the movement of the particles in the medium is in the same dimension as the wave’s movement direction. Examples of longitudinal waves include compression wave and sound waves. Transverse waves are waves in which the medium moves at an angle to the wave’s direction. Examples include stringed instruments and light waves.

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To incubate the eggs, we need to use a low-efficiency light bulb because it will produce more heat.

The working light bulb in the incubator is when it turned on the machine the bulb lit up and the box got hot. When the temperature reaches 38 degrees Celsius, the sensor triggers the temperature controller to turn off the bulb. Therefore, the temperature of the box was kept up to a certain limit. Humidity in the box was maintained by a jar filled with water. Water was added daily to keep the humidity between 60% and 90%. Eggs were rotated twice daily to ensure that all sides of the eggs were hatched. This buildup was monitored for up to 22 days.

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The answer to this question is  c : the distance traveled by a wave crest and the time taken

As velocity is given as
 velocity = Distance/ time

Further there is another way,
The wave's velocity equals the product of its wavelength and frequency (number of vibrations per second) and is independent of its intensity.

The formula is shown below:
                v = f×λ

Where,

Wave speed  in  m/s

Frequency  in Hz

Wavelength  in m

Hence, the formula for calculating wave velocity is f× λ.

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Answer:

Explanation:

Refraction of a light ray may be defined as:

D. changing direction while crossing a boundary ​

The difference between linear speed and angular speed is linear speed calculates the distance to time whereas angular speed calculates the angle to time.

The difference between the linear speed and the angular speed is that linear speed is just a measurement determined by calculating the distance of an arc versus time taken, and angular velocity is also a measurement determined by calculating the angle of an arc versus time taken.

The formula of the linear speed is

                          s = d / t

where s is the speed

          d is the distance

          t is the time taken

The formula of the angular speed is

                       ω = θ / t

where ω is the angular speed

           θ is the angular rotation

           t is the time taken.

The relation between the linear speed and angular speed in a uniform circular motion is

                           s = rω

where s is the linear speed

           r is the radius

          ω is the angular speed.

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Answer: That is not a question.

Explanation: It is a random jumble of letters. It also has no question mark.

Magnetic field will be equal to 0.269 T

A magnetic field, a vector field that defines the magnetic effect on moving electric charges, electric currents, and magnetic materials. A moving charge within a magnetic field experiences a force perpendicular to its velocity and to the magnetic field.

Given,

Mass of chlorine ion is 35u

We know that 1 u = 1.66 × 10⁻²⁷kg

Radius of circular path (r) = 3.5 m

Mass of chlorine ion = 35 × 1.66 × 10⁻²⁷

= 58.1 × 10⁻²⁷kg

Charge (q) =  1.6 × 10⁻¹⁹C

Potential difference (V) = 250 Kv

According to conservation of energy:

¹/₂ mv² = qV

¹/₂ × 58.1 × 10⁻²⁷ × v² = 1.6 × 10⁻¹⁹ × 25 × 10⁴

v = 2.6 × 10⁶ m/s

As we know,

r = mV/qB

B = mV/qr

B =  58.1 × 10⁻²⁷× 25 × 10⁴/1.6 × 10⁻¹⁹× 3.5

B =  0.269 T

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Vehicle tail lights must be visible from 500 feet to the rear in normal sunlight.

On most of the vehicles, the tail lights are red and the brake lights are more luminous red. Tail lights also include the backup lights which are white in color. The idea of "red signifies stop" has always been connected to danger. Red can be an indication of dangerous plants and insects in the natural world.

The wavelength of red light is the highest (620-750 nm) so it can travel the largest distance and can be visible from a distance of 500 Feet.

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The magnification of a Galilean telescope adjusted for a relaxed eye is 36.2 cm long is 0.2838 or 28%.

To calculate the magnification of a Galilean telescope, we must first know the focal length of the objective lens. The focal length of a lens is found by dividing its distance from the object by its distance from the image. In this case, we are looking for 39 cm, so we can calculate that the focal length is 40.0 cm/39 cm = 1.03.

Now we have all of our information. Using our equation for magnification (M=f-o/f), we can find that

M=1.03-36.2/39

= 0.2838 or 28%.

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The percent of the world’s earthquakes occurring around the pacific rim/ring of fire will be 90%.

The Ring of Fire is home to more than 450 volcanoes or 75% of all volcanoes on Earth. The majority of earthquakes that occur on Earth, including the most intense and spectacular seismic occurrences, ever recorded, happen along its course. The region of earthquakes encircling the Pacific Ocean is known as the "Ring of Fire," also known as the Circum-Pacific belt; it is where 90% of all earthquakes on earth take place.

The extensive movement of tectonic plates in the region is the reason for the high frequency of earthquakes and volcanoes in the Ring of Fire. Plates collide along convergent boundaries known as subduction zones around a large portion of the Ring of Fire. In other words, the plate above pushes down or subducts, the plate below.

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Explanation:

Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations faster. Sound travels most slowly through gases because the molecules of a gas are farthest apart.

Answer:

About 2483 miles per hour.

Explanation:

Check out the image.