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The unit of density is called derived unit, why?​

Frequency gives the number of unique purchases and monetary calculates the amount of money spent.

Frequency, in physics, is the number of waves that pass fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

What is frequency?

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An acoustic signal or sound pulse is sent into the water by active sonar transducers. The sound pulse will bounce off an item if one is in the way of the sound pulse, sending a "echo" back to the sonar transducer.

SONAR is most useful underwater, although it also functions in the open air. The reason for this is that sound travels farther in water.

Sonar devices use sound waves to penetrate the ocean and record the sound waves that are reflected back to display items below the surface. This is known as active sonar, which is a type of echolocation similar to that employed by bats. Similar technology exists in radar, but radio waves are used in it.

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This procedure enables life as we know it. And electromagnetic waves influence modern life in countless smaller-scale (but more immediate) ways. For example, electromagnetic waves are responsible for your cell phone, Wi-Fi connection, microwave, and medical imaging methods like x-ray and MRI.

Energy is moved around the planet in two main ways: mechanical waves and electromagnetic waves. Mechanical waves include air and water waves caused by sound.

Therefore, Ocean waves are crucial for climate modelling, weather forecasting, coastal towns, shipping lanes, and offshore business.

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The kinetic energy of the ball when it has a mass of 0.7 kg is 14000J.

When the speed is 180 m/s its K.E. changes to 11340 J.

Calculate the kinetic energy of the following options?

A. Kinetic energy E = 1/2 [tex]mv^{2}[/tex]

mass (m) = 0.7 kg

speed (v) = 200 m/s

K.E = 1/2 (0.7) (200)^2

K.E = 1/2 (28000)

K.E = 14,000J

K.E = 14 x 10^3 J

The kinetic energy of the ball has a mass of 0.7 kg is 14 x [tex]10^{3}[/tex] J

B. The kinetic energy is directly proportional to the square of the speed or velocity. When the speed increases its kinetic energy also increases. When the speed decreases also its kinetic energy is decreases.

K.E. = 1/2 [tex]mv^{2}[/tex]

K.E. = 1/2 (0.7) (180)^2

K.E. = 11,340 J

So, the speed of the kinetic energy is decreased, the value of K.E. is also decreased.

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Kinetic Friction, or Sliding Friction, is the friction between skates and ice. When two items slide past each other, this form of friction develops.

Sliding Friction is created when the skate blade passes through the ice. The beautiful curves are governed by the second law. Acceleration is required for a change in velocity, which includes both speed and direction. Because of the constantly changing direction, traveling in a circle at a constant speed includes acceleration. Because everyone is initially at rest, the system's linear momentum is zero. Because there is no external force acting on the system when the guy throws the ball, linear momentum must be conserved.

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Yes, the weight of the suspension clamps is omitted from the calculation as long as each side of the support is the same.

Suspension clamps are mainly used for overhead power lines or substations. It can hang wire, lightning protection wire on insulator string, or lightning protection cable on the tower by connecting fittings. Suspension clamps are mainly made of malleable iron and aluminum alloy.

Given the same number of clamps on both sides of the support, when we calculate the torque, the weight of the clamps will disappear from each side.

Like there are 2 clamps on each side so the torque due to the clamps are going to be

                  τ = r x F = 2 * W * d - 2 * W * d          

So that the weight of the clamps can be omitted as in the final calculation of the torque as each clamp will cancel out. Provided that the position of the clamps on both sides of the support is the same (i.e., distance d from the support)

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The response to the questions are given below:

1a. The condition for the equilibrium of a rigid body acted upon by parallel forces is that the vector sum of all the forces acting on the body must be equal to zero, and the vector sum of all the torques (moments) acting on the body must also be equal to zero.

1bi. An experiment to determine the mass of a meter rule using the principles of moments could involve suspending the meter rule from a pivot point using a string or wire, and then applying known weights to the ends of the meter rule.

1bii. Two precautions that should be taken to ensure accurate results in this experiment would be to ensure that the pivot point is perfectly level and that the weights applied to the ends of the meter rule are applied at exactly the same distance from the pivot point.

C. A couple in physics is a pair of forces that act on a body in such a way that they produce a turning effect, or torque, about a fixed point. A couple consists of two equal and opposite forces that are applied to the body at different points.

When a rigid body's linear momentum or rotational momentum are not changing at any given time, it is said to be in mechanical equilibrium. The body is in a state of mechanical equilibrium when there is no linear or angular acceleration.

When a rigid body's linear and angular acceleration are both zero with respect to an inertial frame of reference, we say that it is in equilibrium. A body in equilibrium can therefore move, but in that case, its linear and angular velocities must remain constant.

Therefore, In essence, there should not be any acceleration for an object to be in equilibrium (linear or angular). Therefore, the item must have zero net force and zero net torque.

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The moon that experiences the greatest gravitational force of attraction from Jupiter is Io, which is the innermost of Jupiter's four largest moons (also known as the Galilean moons).

Io is the most massive of the Galilean moons, and it is also the closest to Jupiter, which means that it experiences the strongest gravitational force of attraction from the planet. In fact, the strong gravitational pull of Jupiter on Io is so great that it causes Io to experience significant tidal forces, which have caused its surface to become heavily fractured and geologically active.

It's worth noting that while Io experiences the strongest gravitational force of attraction from Jupiter, the other Galilean moons (Europa, Ganymede, and Callisto) also experience significant gravitational forces due to their large masses and close proximity to Jupiter.

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Answer:the answer is A, lo

Explanation:

The index of refraction of the glass at a wavelength of 589 nm is approximately 1.58

To determine the index of refraction of the glass at a wavelength of 589 nm, we can use the formula:

where n is the index of refraction, c is the speed of light in a vacuum (which is approximately 3 x 10^8 m/s), and v is the speed of light in the glass.

Plugging in the values provided, we get:

n = 3 x 10^8 m/s / 1.90 x 10^8 m/s

  = 1.58

This means that the index of refraction of the glass at a wavelength of 589 nm is approximately 1.58. The index of refraction is a measure of how much the speed of light is reduced when it travels through the glass, so a higher index of refraction indicates that light travels more slowly through the glass.

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Answer:

Similarly, the law of conservation of energy states that the amount of energy is neither created nor destroyed. For example, when you roll a toy car down a ramp and it hits a wall, the energy is transferred from kinetic energy to potential energy.

Explanation: To be more clear, your answer would be A

Correct option is D, the stopping potential when metal with work of 0.6 eV is illuminated with the light of 2.6 ev is 1.4 V

The minimal negative voltage that must be provided to the anode to halt the photocurrent is known as stopping potential. When expressed in electron volts, the maximal kinetic energy of the electrons is equal to the stopping voltage. The stopping potential (V0) for the specified frequency of incident radiation in an experimental setup for the photoelectric effect is the value of the negative potential of the collector plate or anode at which the photoelectric current will fall to zero.

Given: E = 2 eV and 0 = 0.6 eV

To locate Potential for stopping (Vo) Formula: Vo = (E - Φ₀)/ e

Calculation:

Vo= 2 × 1.6 × 10^-19 – 0.6 × 1.6 × 10^-1 / 1.6 × 10-19

= 2 -0.6

= 1.4 V

1.4 V is the stopping potential.

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The length of the string is 75 cm.

Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.

Given that:  The centripetal acceleration of the ball is: a = 24.7 m/s^2.

constant speed of the ball is: v = 4.3m/s.

Let  the length of the string is l.

We know that:   The centripetal acceleration: a = v^2/l

l = v^2/a

= (4.3)^2/24.7

= 0.75 m.

Hence,  the length of the string is 0.75 m or 75 cm.

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Answer:

Neutral

Explanation:

The buoyant force balances the force of gravity when the average density of an object is equal to the density of the fluid in which it is immersed, resulting in the object sinking (if its density is greater than the density of the fluid) or rising (if it is less). Neutral buoyancy occurs when the average density of an object equals the density of the fluid in which it is immersed. There is no sinking or rising for an object with neutral buoyancy.

The shuttlecock began 7 meters above the ground, and fell through a vacuum. The equation a = v/t shows acceleration (a), which is the change in velocity (v) over the change in time (t).

time chart A velocity vs. time graph can be used to determine position and to calculate velocity. We are aware that v = d/t. Rearranging the equation with a little mathematics reveals that d = v t.

△a = △v/△t, For an item travelling at a constant rate of acceleration, the rate of acceleration remains constant over all time intervals. As a result, the acceleration-time graph has a slope of zero and is parallel to the time axis.

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A gas dissolves in a liquid most rapidly when under High pressure.

An example of a high pressure boiler is one that produces energy in thermal power plants that runs at 80 bars or more. They produce electricity by turning water into steam through thermal energy using water-filled tubes in a metal tank or enclosure, which is then utilized to power machinery. There is a higher likelihood of leaks occurring in the system if the boiler pressure is too high. The system won't function as well if the boiler pressure is too low, though. For your system to effectively heat your home, it is crucial to maintain the proper boiler pressure.

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Answer:

c

Explanation:

Answer: cold or hot

Explanation:

Leonardo da Vinci utilised a tube introduced into the water to listen for vessels in order to employ the technology for the first time, in 1490.

What was employed before to sonar?

To combat the rising threat of submarine warfare, it was developed during World War I, and by 1918, a functioning passive sonar system was in use.

An overview of sonar technology. Measuring depth is a key component of seafloor mapping. Prior to the First World War, lead lining was typically used to gauge ocean depth. This required lowering a piece of lead—typically a cannonball—to the ocean floor on a very long piano wire.

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Important Formulas:

[tex]w=Fd[/tex]

[tex]F=ma[/tex]

work(measured in joules) = force(measured in newtons) * distance(measured in meters)

force(measured in newtons) = mass(measured in kg) * acceleration(measured in m/s^2)

__________________________________________________________

Given:

[tex]m=150kg[/tex]

[tex]d=2m[/tex]

[tex]a=9.8m/s^2[/tex] (acceleration due to gravity)

[tex]w=?[/tex]

__________________________________________________________

Finding force:

[tex]F=ma[/tex]

[tex]F=150\times9.8[/tex]

[tex]F=1470N[/tex]

__________________________________________________________

Finding work:

[tex]w=Fd[/tex]

[tex]w=1470\times2[/tex]

[tex]w=2940J[/tex]

__________________________________________________________

[tex]\fbox{Option B}[/tex]

Because the wall is not moving, the work you are performing on it is coming closer by exerting 400 n of force.

Despite the man's forceful efforts, the wall does not budge. Work completed equals force applied times displacement, and since the wall's displacement is 0, work completed is also zero.

When an object experiences force and is moved from its starting location, this is referred to as doing work. The Joule is the SI unit of work. A joule is defined as a newton of force applied to an object that results in a displacement of one meter. This signifies that when force is exerted to a wall, nothing is accomplished.

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18902.4 J kinetic energy just before it strikes the ground.

The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force. After the job is finished, energy is transferred to the item, which then moves at a new, constant speed.

Given that,

mass (m) = 18.3 kg

height (h) = 105.4 m

Thus, Potential energy (P.E) = mgh

or, P.E = (18.3) ×(9.8) ×(105.4)

or, P.E = 18902.4 J

Kinetic energy (K.E) = Potential energy (P.E)

or, Kinetic energy (K.E) = 18902.4 J

Thus, 18902.4 J kinetic energy needed just before it strikes the ground.

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Answer:

negative

Explanation:

positive charges attract negative charges and vice versa. and are possible to nullify

The cutoff wavelength calculation formula is  λ = c/f.

The cutoff wavelength is the lowest wavelength at which light may cause electrons on a metal plate to become free.

The shortest wavelength of light that will not cause electrons to be emitted from a metal surface is the cut-off wavelength, sometimes referred to as the threshold wavelength. If no electrons are released, the light's wavelength must be below the threshold wavelength.

The wavelength at which the power level of the Higher Order Modes has decreased by 19.3 dB in comparison to the level of the Fundamental Mode is known as the Cut-off Wavelength (strictly speaking this is true only for the Second Order Mode).

The formula to calculate cutoff wavelength is λ = c/f

where λ is the wavelength of light

c = speed of light

f = frequency of light

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Nuclear fusion reactions begin in the main sequence stage of a star's life.

During the main sequence stage, a star is in hydrostatic equilibrium, meaning that the outward pressure of the hot, dense gas at its core is balanced by the inward gravitational force. This balance allows the star to maintain a stable size and luminosity.

At the core of a main sequence star, the temperature and pressure are high enough to initiate nuclear fusion reactions, in which hydrogen nuclei combine to form heavier helium nuclei. These reactions release a large amount of energy in the form of light and heat, which helps to maintain the high temperature and pressure at the core and keep the star in hydrostatic equilibrium.

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Answer:

To calculate the amount of work required for an 80kg firefighter to run up a 21.5m in 60s, we first need to determine the force required to lift the firefighter up the 21.5m. Because the firefighter is running, we can assume that their body is moving at a constant speed, so the force required to lift them is equal to their weight, or 80kg.

Next, we need to calculate the distance over which the force is applied. In this case, the firefighter is running up a 21.5m flight of stairs, so the distance is 21.5m.

Finally, we need to determine the time over which the force is applied. In this case, the firefighter runs up the stairs in 60s, so the time is 60s.

To calculate the amount of work required, we use the formula W = F * d, where W is the work, F is the force, and d is the distance. Plugging in the values we determined above, we get:

W = 80kg * 21.5m = 1720kgm

Therefore, the amount of work required for the firefighter to run up the stairs in 60s is 1720kgm.

The amount of work required for the firefighter to run is 5.2 J.

Kinetic energy is defined as the energy acquired by a body by virtue of its motion.

Here,

Mass of the firefighter, m = 80 kg

Distance to be covered by the firefighter, d = 21.5m

Time taken by the firefighter, t = 60 s

So, velocity of the firefighter,

v = d/t

v = 21.5/60

v = 0.36 m/s

The amount of work required for the firefighter to run is equal to his kinetic energy.

Therefore, kinetic energy of the firefighter,

KE = 1/2 mv²

KE = 1/2 x 80 x(0.36)²

KE = 5.2 J

Hence,

The amount of work required for the firefighter to run is 5.2 J.

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In comparison to solar panels, which are just 18% to 22% efficient, wind turbines typically capture 60% of the energy that travels through them. It follows that it is undisputed that a single house wind turbine can generate more electricity than a number of solar panels.

Through photovoltaic (PV) panels or mirrors that concentrate solar radiation, solar technologies turn sunlight into electrical energy. Batteries or thermal storage devices can be used to store this energy or to generate power.

On the top of a solar panel, a thin layer of silicon is hit by photons, or light particles, which dislodge electrons from silicon atoms. The wiring in solar panels is able to capture the electric current that this PV charge generates.

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E = hv is the energy equation. In the formula, E stands for energy, h for Planck's constant (6.626 x 10 -34 J s), and v for frequency. Since frequency rises as energy falls, frequency and energy are related directly in the energy equation.

The frequency of the radiation directly affects how much energy each quantum contains. The amount of energy carried is inversely proportional to wavelength since frequency and wavelength have an inverse relationship.

The equation E=hv, where h is Planck's constant, describes the relationship between a photon's energy E and frequency v.

In essence, energy is inversely proportional to wavelength but directly proportional to radiation frequency. Accordingly, energy rises with a rise in frequency or a fall in wavelength, and falls with a fall in frequency or a rise in wavelength.

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Answer:

Running up a flight of stairs is different than walking because it requires a different type of muscle activity. When walking, the muscles in your legs move in a more controlled and rhythmic manner, allowing you to maintain a steady pace and avoid stumbling. In contrast, running up stairs requires your muscles to work in a more explosive and powerful manner, generating bursts of force to push you upward and forward. This type of muscle activity is much more intense and demanding, and it requires more energy and effort than walking.

Additionally, running up stairs also requires you to overcome the force of gravity to a greater extent than walking. When you walk up stairs, you are able to use the stairs to support your weight and to assist you in moving upward. When running, however, you are moving too quickly to use the stairs in this way, and you must rely on your own muscle power to lift your body upward. This additional force of gravity makes running up stairs more challenging and demanding than walking.

A big machine is composed of several moving and stationary parts. Some of these parts are in a state of constant motion hence they periodically rub against each other.

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