Which of the following is the most suitable for wavelength standard? a) Cadmium 114 b) Krypton 86 c) Mercury 198 d) Any monochromatic light.

One of the three astronomical objects that were first detected at radio wavelengths by the Groote Reber in the 1930s and 1940s was the Milky Way Galaxy.

American engineer and radio astronomer Groote Reber built the first radio astronomy parabolic radio telescope. Reber used his radio telescope to map the radio emissions from the Milky Way Galaxy, proving that astronomical objects emit radio waves. This finding was a milestone in radio astronomy and offered a new window to the cosmos beyond optical observatories.

Reber discovered radio galaxies, cosmic microwave background radiation, and the Milky Way. These discoveries changed our knowledge of the cosmos and led to radio astronomy.

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To raise the automobile with a hydraulic lift, a force of approximately 19,000 N must be applied to the piston.

In a hydraulic lift, the principle of Pascal's law is applied, which states that pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and the walls of its container. By utilizing this principle, a smaller force applied to a smaller piston can generate a larger force on a larger piston.

In this scenario, the force needed to lift the automobile can be calculated using the formula:

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

where \(F_{1}\) is the force applied to the piston, \(A_{1}\) is the area of the piston, \(F_{2}\) is the force generated on the larger piston (required to lift the automobile), and \(A_{2}\) is the area of the larger piston.

Given the radius of the shaft (small piston) as 0.08 m and the radius of the piston as 0.01 m, we can calculate the forces applied and generated as follows:

\(A_{1} = \pi (0.08)^2\\A_{2}= \pi (0.01)^2\)

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

Simplifying the equation and substituting the values, we can solve for \(F_{2}\):

\(F_{2}=\frac{F_{1}A_{2}}{A_{1}}\)

Plugging in the values, we find:

\(F_{2}=\frac{F_{1} \pi (0.01)^2 }{ \pi (0.08)^2} \\F_{2}= \frac{F_{1}\times 0.0001}{0.0064} \\F_{2}= 0.015625 \times F_{1}\)

Given that the mass of the automobile is 1520 kg and the acceleration due to gravity is \(9.8 \hspace m/s^{2}\), we can equate \(F_{2}\) to the weight of the automobile:

\(F_{2}= mg\\0.015625\times F_{1}= 1520\times 9.8\)

Solving for \(F_{1}\), we find:

\(F_{1}\approx \frac{1520\times 9.8}{0.015624} \\F_{1} \approx 19072 \hspace N\)

Therefore, a force of approximately 19,000 N must be applied to the piston in order to raise the automobile using the hydraulic lift.

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If you have 2 kilowatt-hours, the conversion would be:

2 kilowatt-hours (kWh) * 3,600,000 joules/kilowatt-hour (J/kWh) = 7,200,000 joules (J)

To convert kilowatt-hours (kWh) to joules (J), we need to utilize the conversion factor that relates these two units. The conversion factor we'll use is based on the definitions of kilowatt-hour and joule:

1 kilowatt-hour (kWh) = 3.6 million joules (3,600,000 J).

The reason behind this conversion is as follows:

A kilowatt-hour (kWh) is a measure of electrical energy consumed over a period of time. It is commonly used to determine electricity bills and the energy consumption of various appliances.

One kilowatt-hour represents the energy consumed when a device with a power rating of one kilowatt operates for one hour. Mathematically, it can be expressed as:

1 kilowatt-hour (kWh) = 1 kilowatt (kW) * 1 hour (h)

Now, let's convert kilowatts (kW) to joules (J) using the definition of joule:

1 joule (J) = 1 watt (W) * 1 second (s)

To convert kilowatts (kW) to watts (W), we multiply by 1,000 (since there are 1,000 watts in a kilowatt):

1 kilowatt (kW) = 1,000 watts (W)

Substituting this into the equation, we have:

1 kilowatt-hour (kWh) = 1,000 watts (W) * 1 hour (h)

Now, we need to convert hours (h) to seconds (s). There are 3,600 seconds in one hour (60 seconds * 60 minutes):

1 hour (h) = 3,600 seconds (s)

Substituting this into the equation, we get:

1 kilowatt-hour (kWh) = 1,000 watts (W) * 3,600 seconds (s)

Simplifying further, we have:

1 kilowatt-hour (kWh) = 3,600,000 watts-seconds (W·s)

Since a watt-second (W·s) is equivalent to a joule (J), we can conclude that:

1 kilowatt-hour (kWh) = 3,600,000 joules (J)

So, to convert kilowatt-hours to joules, you simply multiply the value in kilowatt-hours by 3,600,000.

For example, if you have 2 kilowatt-hours, the conversion would be:

2 kilowatt-hours (kWh) * 3,600,000 joules/kilowatt-hour (J/kWh) = 7,200,000 joules (J)

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Explanation:

The weight is 40 * 6.2 = 248N.

Answer:

248 N

Explanation:

Weight= Gravity*mass

W= 6.2*40

W= 248N

Thank you

Answer:

there's gravity on earth so it's heavier

Mass of substance is the quantity of matter which is constant throughout the universe irrespective of the gravity of the planet, therefore the mass would be the same on earth as well as on the moon.

It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another,

The mass of any object is constant throughout and it is measured in kilograms while the weight of any object can vary depending on the value of gravity.

The quantity of stuff known as mass remains constant throughout the cosmos, independent of a planet's gravity, hence it follows that mass would be the same on Earth and the Moon.

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A dimensionless quantity is a physical quantity that has no units. It is the result of the multiplication or division of two or more physical quantities that have different units. Examples of dimensionless quantities include the coefficient of friction, electrical conductance, angles, and Mach number.

The quantity that does not have any units is called a dimensionless quantity. It is the result of dividing or multiplying two or more physical quantities having different units. An example of a dimensionless quantity is the coefficient of friction, which is a ratio of two forces, and the unit of force cancels out.

The reason behind this is that it is a result of multiplication or division of two or more physical quantities with different units. For example, the coefficient of friction is a dimensionless quantity that represents the ratio of two forces. Therefore, it has no units.

Some other examples of dimensionless quantities include ratios, fractions, and percentages. For instance, electrical conductance, which is a ratio of electrical current and voltage, is a dimensionless quantity. Similarly, angles, which are also ratios of distances, are dimensionless quantities. As another example, Mach number is also a dimensionless quantity that represents the ratio of the speed of an object to the speed of sound in the medium. It is unitless because it is a result of the division of two different velocity measurements.

A dimensionless quantity is a physical quantity that has no units. It is the result of the multiplication or division of two or more physical quantities that have different units. Examples of dimensionless quantities include the coefficient of friction, electrical conductance, angles, and Mach number.

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Answer:

D

Explanation:

These all can impact the magnetic properties

In this scenario, the work being done by the force of friction can be classified as negative work.

Work is defined as the transfer of energy that occurs when a force is applied to an object and it moves through a displacement. The formula for calculating work is W = F * d * cos(theta), where W represents work, F is the magnitude of the force, d is the displacement, and theta is the angle between the force and the direction of the displacement.

In this case, the force being applied is 45N, and the displacement is 9m. The force of friction acts in the opposite direction to the motion, which means it is opposing the movement of your friend as she is being pushed. Therefore, the angle between the force of friction and the direction of displacement is 180 degrees.

When cos(\(180\) degrees) is evaluated, it results in a value of -1. This negative value indicates that the force of friction is acting opposite to the displacement. As a result, the work done by the force of friction is negative.

Negative work signifies that the force of friction is absorbing energy from the system instead of adding energy to it. In the context of your friend's ice skating, the negative work done by the force of friction represents the dissipation of energy as heat due to the resistance between the ice and the skates. This resistance slows down your friend's motion and makes it more difficult for her to maintain her speed or accelerate.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

The average velocity over the given time intervals is 53.275 m/s.

Given that an arrow is shot upward on the moon with a velocity of 58 m/s, and its height in meters after seconds is given by h(t) = -1.625t² + 58t.

We need to find the average velocity over the given time intervals. Time interval t = 0 to t = 6 seconds Here, initial velocity, u = 58 m/s

Final velocity, v = velocity after 6 seconds So, using the formula v = u + at where a = acceleration on the moon = -1.625 m/s²After 6 seconds, we have

v = u + atv

= 58 + (-1.625) × 6v

= 48.55 m/s

So, the average velocity over the given time intervals is(v + u) / 2= (48.55 + 58) / 2

= 53.275 m/s

Hence, the average velocity over the given time intervals is 53.275 m/s.

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Answer:

A

Explanation:

Please see the attached picture for the full solution.

Since we are only concerned about the decrease in gravitational potential energy of the car, we look at the decrease in height of the car as it moves from point X to point Y, instead of the distance travelled by the car.

A planes average speed between two cities is 610 km/hr. If the trip takes 2. 25 hrs, then the distance covered by a plane is  1372.5 kilometers.

To calculate the distance the plane flies, we can use the formula:

Distance = Speed × Time

Given that the average speed of the plane is 610 km/hr and the trip takes 2.25 hours, we can substitute these values into the formula to find the distance.

Distance = 610 km/hr × 2.25 hrs

To multiply these values, we need to align the units correctly. By canceling out "hrs" in the numerator and denominator, we get:

Distance = 610 km × 2.25

Multiplying 610 km by 2.25 gives us:

Distance = 1372.5 km

Therefore, the plane flies a distance of 1372.5 kilometers.

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Given that a plane's average speed between two cities is 610 km/hr and the trip takes 2.25 hrs. We are to find the distance covered by the plane The plane flies 1372.5 km

Let's find the solution to this problem .The formula for distance, speed and time isd

= s * there,

d = distance covered by the planes

= speed t

= time taken

Substituting the given values, we have610 × 2.25 = 1372.5 km

Hence, the plane flies 1372.5 km.

Given that a plane's average speed between two cities is 610 km/hr and the trip takes 2.25 hrs. We are to find the distance covered by the plane

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Answer:

d = 513 m

Explanation:

Given that,

An echo returned in 3s.

We need to find the distance of the reflecting surface from the source, given that the speed of sound is 342 m/s.

The sound will cover 2d distance. The formula for the speed is given by :

v = d/t

So,

\(v=\dfrac{2d}{t}\\\\d=\dfrac{vt}{2}\\\\d=\dfrac{342\times 3}{2}\\\\d=513\ m\)

So, the required distance is 513 m.

If an object is speeding up its acceleration can be positive or negative depending on the direction of motion.

According to mathematics, a negative acceleration indicates that the velocity will be subtracted, while a positive acceleration indicates that the velocity will be increased.

In physics,

A positive acceleration indicates a rising velocity over time.

Negative acceleration describes a speed decrease over time.

A bus or car going at an accelerating rate is said to have positive acceleration.

We may say that it is speeding up in the direction it is moving.

When we use the brake in the previous example, the speed of the car reduces.

Then it experiences a deceleration.

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Answer:

Explanation:

ave speed is always (frequency) x (wavelength)

Speed  =  (450 /sec) x (0.52 m)

=      234 m/sec .

The mass moment of inertia about the y-axis (Iyy) for the solid of revolution with mass m can be determined using direct integration, resulting in Iyy = (7/22)mb².

To calculate Iyy using direct integration, follow these steps:
1. Identify the function y=f(x) representing the curve to be revolved around the y-axis.
2. Calculate the area element dA in terms of x: dA = 2πxρdx, where ρ is the mass per unit area (m/A).
3. Determine the mass element dm: dm = ρdA = 2πxρdx.
4. Obtain the moment of inertia element dIyy: dIyy = x²dm = 2πx³ρdx.
5. Integrate dIyy from x=a to x=b: Iyy = ∫(2πx³ρdx) from a to b.
6. Substitute the mass per unit area (ρ=m/A) into the integral and solve for Iyy.
7. Finally, after evaluating the integral, the mass moment of inertia will be given by Iyy = (7/22)mb².

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To find the voltage of the combined drops, we can just add the voltage of both drops together.

2(235.15) = 470.3 Volts

Joules, volts, and electron volts (eV) are units used to measure different types of physical quantities related to energy and electricity.

Joules (J) measure energy, which can be in various forms such as potential, kinetic, or thermal energy. It is a derived unit in the International System of Units (SI) and is defined as the amount of work done when a force of one newton displaces an object by one meter in the direction of the force.Volts (V) measure electric potential difference, also known as voltage, between two points in an electric circuit. It indicates the amount of work needed to move a unit of electric charge between these points. One volt is equivalent to one joule of energy per coulomb of charge.Electron volts (eV) measure energy on a smaller scale, typically at the atomic or subatomic level. It is the amount of kinetic energy gained or lost by a single electron when it is accelerated through an electric potential difference of one volt. It is commonly used in particle physics and quantum mechanics to express the energies of particles, atoms, and other small-scale phenomena.In summary, joules measure energy, volts measure electric potential difference, and electron volts measure energy on a smaller scale, particularly for atomic and subatomic particles.

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The movement of cargo from one end of the axon to the other involves transport along the microtubules.

Cargo consists of goods conveyed by water, air, or land.In economics, freight is cargo that is transported at a freight rate for commercial gain. The cargo was originally a shipload but now covers all types of freight, including transport by rail, van, truck, or intermodal container. The term cargo is also used in the case of goods in the cold-chain, because the perishable inventory is always in transit towards a final end-use, even when it is held in cold storage or other similar climate-controlled facilities. The term freight is commonly used to describe the movements of flows of goods being transported by any mode of transportation.

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Answer:

The Answer is A

Explanation:

No, the addition of a parallel capacitor does not necessarily decrease both the electric field and voltage. The electric field and voltage depend on the specific configuration of the circuit and the characteristics of the components involved.

When you add a capacitor in parallel to an existing circuit, it introduces an additional path for current to flow. The capacitor stores electric charge and can affect the distribution of voltage and electric field in the circuit. The effect on voltage and electric field depends on the relative capacitance of the added capacitor and the other components in the circuit. In some cases, adding a capacitor in parallel can cause a decrease in voltage across the capacitor itself. This is because the capacitor can initially act as a short circuit, allowing current to flow through it and reducing the voltage across it. However, the voltage across the other components in the circuit may not necessarily decrease. Regarding the electric field, the electric field is primarily determined by the voltage difference across a component and the physical arrangement of the circuit. Adding a parallel capacitor may affect the electric field locally around the capacitor, but it does not necessarily cause a decrease in the overall electric field throughout the entire circuit.

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Answer:

C . 3.75 Ohms

Explanation:

V = IR

R = V / I

From the graph, you pick a value for potential difference and find its corresponding current.

The resistance of the wire in Ohms is 3.75 Ω, therefore the correct answer is option C

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

where V is the voltage

I is the current

From the voltage-current  graph, one can know the resistance by calculating the slope of the graph

As shown in the graph the variation of the voltage with the current

Y axis represents the voltage and the X axis represents the current

slope = variation in the Y coordinate /variation in the X coordinate

resistance = variation in the voltage /variation in the current

                 = (30 - 0 )/ (8-0 )

                 = 3.75 Ω

Thus, by observation and calculation from the graph, the resistance of the wire comes out to be 3.75 Ω

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No, it is not likely that two particles will pick the same prime. According to the prime number theorem, there are approximately 2¹⁵⁰ (approximately 1.3 * 10⁴⁵) 150 digit primes.

The Prime Number Theorem is a theorem in number theory that states that the number of prime numbers less than or equal to a given integer n is approximately equal to n/ln(n). This theorem is important because it provides an estimate of the prime numbers and can be used to study the distribution of prime numbers in the large numbers. The theorem also provides a way to estimate the probability of a given number being prime. The prime number theorem has wide applications in mathematics and computer science.

Since the number of particles is much lower than the number of primes, the chance of two particles picking the same prime is incredibly small.

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Answer:

Explanation:

The work done by an object can be found by using the formula

From the question

force = 400 N

distance = 50 m

We have

work done = 400 × 50

We have the final answer as

Hope this helps you

The mass of the scoreboard is 1313.7 kg.

To find the scoreboard's mass, we need to calculate the total force acting on the scoreboard and then use the equation F = ma to find the mass.

First, let's calculate the vertical component of the force from the six cables that make an angle of 8.0° with the vertical. The vertical component of the force is given by:

Fv = F * cosθ

Where F is the tension in each cable (1300.0 N) and θ is the angle between the cable and the vertical (8.0°).

Fv = 1300.0 * cos(8.0°)

Fv = 1289.1 N

The total vertical force from these six cables is:

Fv,total = 6 * 1289.1

Fv,total = 7734.6 N

Now, let's calculate the vertical component of the force from the four cables that make an angle of 10.0° with the vertical. The vertical component of the force is given by:

Fv = F * cosθ

Where F is the tension in each cable (1300.0 N) and θ is the angle between the cable and the vertical (10.0°).

Fv = 1300.0 * cos(10.0°)

Fv = 1284.8 N

The total vertical force from these four cables is:

Fv,total = 4 * 1284.8

Fv,total = 5139.2 N

The total vertical force acting on the scoreboard is the sum of the vertical forces from the six cables and the four cables:

Fv,total = 7734.6 + 5139.2

Fv,total = 12873.8 N

Now, we can use the equation F = ma to find the mass of the scoreboard. The acceleration due to gravity is 9.8 m/s^2:

F = ma

12873.8 = m * 9.8

m = 12873.8 / 9.8

m = 1313.7 kg

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A parallel circuit is described as a type of circuit in which there are several current paths.

A parallel circuit is a type of electrical circuit where two or more components are connected in parallel, and each component has its path for electric current flow. The path is separate from all other parts, and each has the same voltage level. The current divides among each path according to the resistance value of the components in the circuit. Parallel circuits are used in various applications, including lighting in households, street lights, and other electronic devices. In a parallel circuit, the voltage across each component is the same, and the total current in the circuit is equal to the sum of the current flowing in each branch.

A parallel circuit is used in the household and other applications to prevent other electrical devices from overloading and cutting off electrical supply, for example, when several devices are plugged into a power source. In a parallel circuit, the voltage divider circuit can be used to divide the voltage among resistors. This is because the voltage across each component in a parallel circuit is the same, and we can use the equation V = IR to calculate the voltage divider.

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While building a house, it's crucial to take energy transmission into account because homes lose a lot of thermal energy. Radiation, conduction, and convection are three ways they can lose energy.

Buildings must consider heat transfer while designing the fabric of the structure as well as the passive and active systems required to provide the desired thermal conditions with the least amount of resource use.

The three most crucial variables are temperature, moisture content, and density. Thickness, air velocity, pressing, and ageing time are further considerations. The correlation between the key variables and thermal conductivity is shown.

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