b) When the wave passes over the glass it refracts. State what will happen to each
of the following properties of the wave when it refracts: (3)
Velocity -
Wavelength -
Frequency -

The total number of complete revolutions the flywheel will make before coming to a stop is 279 revolutions.

To determine the total number of complete revolutions the flywheel will make before coming to a stop, we can break down the problem into each minute of operation and calculate the number of revolutions for each minute.

Given:

Maximum speed of the flywheel: 170 revolutions per minute

Let's calculate the number of revolutions for each minute:

Minute 1: 170 revolutions (maximum speed)

Minute 2: (2/5) * 170 = 68 revolutions

Minute 3: (2/5) * 68 = 27.2 revolutions (rounded to the nearest whole number)

Minute 4: (2/5) * 27.2 = 10.88 revolutions (rounded to the nearest whole number)

Minute 5: (2/5) * 10.88 = 4.352 revolutions (rounded to the nearest whole number)

The pattern continues with the flywheel rotating two-fifths as many times each subsequent minute until it comes to a stop. However, since the values become progressively smaller, we can see that the flywheel will never complete another whole revolution after Minute 5.

Therefore, the total number of complete revolutions the flywheel will make before coming to a stop is 170 + 68 + 27 + 10 + 4 = 279 revolutions.

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The amount of heat transferred to the wooden beam if it has mass 60kg is 70800 J

Amount is a mathematical concept that refers to the quantity or size of something. It can be used to describe a numerical value, such as a monetary amount, a quantity of units of measurement, or a count of items. Amounts can also be expressed in terms of fractions, decimals, or percentages. In everyday use, it is often used to refer to the total sum of money, goods, or services involved in a transaction. For example, when discussing a purchase, one might say "the amount was $25." Amount is also used in a more general sense, to refer to a large quantity or number of something. For example, one might say "there was a huge amount of people at the event."

Heat transferred (Q) = mass (m) x specific heat capacity (c) x change in temperature (ΔT)
Q = 60 kg x 0.84 J/g°C x (35°C - 15°C)
Q = 70800 J

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Answer: Momentum can be defined as "mass in motion

Explanation:

Answer:Assuming that the basketball is dropped from rest and bounces back up to its initial height of 4 feet, we can use the equations of motion to find the distance and displacement.

The distance traveled by the basketball is the total length of the path it travels, which can be calculated by adding up the distance traveled during each phase of the motion. During the first phase, the ball falls from a height of 4 feet to the ground, a distance of 4 feet. During the second phase, the ball bounces back up from the ground to a height of 4 feet, covering the same distance of 4 feet. Therefore, the total distance traveled by the basketball is:

Distance = 4 + 4 = 8 feet

The displacement of the basketball, on the other hand, is the straight-line distance between its initial and final positions. Since the basketball returns to its initial height of 4 feet, its displacement is equal to zero. Therefore:

Displacement = 0 feet

Explanation:

The displacement on x-axis is 75 cm and the distance that moved by the child is 80 cm

We are given that,

Starting point of child = d₁ = 10cm

Reaching point of the child = d₂ = 70cm

Move back = 5cm

Therefore, total distance covered by a child can be given as,

Δd = 10cm + 70 cm = 80 cm

Thus, the total distance is 80cm and a child moves back 5cm then the displacement would be given as,

Displacement = total distance cover - distance move back

Displacement = 80cm - 5 cm = 75 cm

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Given wavelength λ=435λ=435 nm, we can find the frequency by using the formula f​=c​/λ                  f=6.89×1014 Hz

The area of space surrounding any electrically charged particle and object where the charge body perceives force is known as the electric field.Examples are:Charges and their arrangements, such as in capacitors and battery cells, produce electric fields.

Volts / metre (V/m) is the electrical field's SI unit.The Newton's per coulomb unit is the same as this one.These units are derivations from Newton, which stands for force, and Coulomb, which stands for charge.

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Answer:

i think it's A

because if there is more friction then it will create more hindrance for the current to flow which is ultimately called resistance .

The drift velocity of electron is 4.54 * 10⁻⁴ m/s.

Given that, Density of copper is 8.8* 10³ kg/m³

Charge of an electron is 1.6* 10⁻¹⁹ C

For the density of copper, the number of free electrons n can be calculated by

n = number of electrons per kg * ρ

⇒ (9.4776* 10²⁴ ) (8.8 * 10³ kg/ 1 m³) = 8.314 * 10²⁸ electrons per m³

Diameter of the wire is given as 2.053 mm

Let us calculate A for the provided diameter of wire

A = π * (d/2)² = π * (2.053 /2)² = 3.310* 10⁻⁶ m²

Given, I = 20 A

We know the expression for drift velocity as

Vd = I /(n* A* e) = 20 / (8.314 * 10²⁸ * 3.310* 10⁻⁶ * 1.6* 10⁻¹⁹) = 20 / (4.403 * 10⁴) = 4.54 * 10⁻⁴ m/s

Thus, the drift velocity of electron is 4.54 * 10⁻⁴ m/s.

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n= log(Ra/Rt)/log(Imin/Imax) ;= log(0.05/0.357)/log(350/700)= 2.84

3 stages of starting resistances

A circuit's opposition to current flow is measured by its resistance. The Greek letter omega () stands for ohms, which are used to measure resistance. Georg Simon Ohm (1784–1854), a German physicist who examined the connection between voltage, current, and resistance, is the subject of the name "Ohm." Many parts have a set resistance value, including heating elements and resistors. In manuals or on nameplates of components, these values are frequently printed for reference.

If there is a tolerance listed, the measured resistance value must fall within the given resistance range. A issue is typically indicated by any appreciable change in a fixed-resistance value.

Although the word "resistance" may sound bad, it has positive uses in electricity. In an active circuit, resistance cannot be measured.

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Elements in the periodic table are arranged in the increasing order of their atomic number.

An atom will contain equal amount of protons and electrons. If two elements are in same period of periodic table then these elements will have same number of electrons.

Helium is one of the seven elements which are called as noble gases. This gas is odorless, tasteless and colorless which makes it unique from other elements.

It has two valence electrons while atoms of other elements in the group have 8 valence electrons.

Lithium has one valence electron, while calcium atom has 2 valence electrons.

The highest level of energy is due valence electrons of an atom.  The correct answer is Lithium.

Fluorine element has 9 electrons. There are 2 electrons in the first energy level and seven electrons in the second energy level.

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Answer:

Long question good luck:)

Explanation:

Answer:7

Explanation:

because its the right answer

Answer:

It would explode

Explanation:

you're welcome

Answer:

the collisions of air molecules against the wall of the can are stronger and more frequent

The factor that often most dramatically influences the rate of an SN2 reaction is the steric hindrance around the reacting site.

The rate of an SN2 (substitution nucleophilic bimolecular) reaction is most dramatically influenced by the steric hindrance around the reacting site. Steric hindrance refers to the interference of bulky substituents or groups that hinder the approach of a nucleophile to the site of reaction.

In an SN2 reaction, the nucleophile attacks the carbon atom that is attached to the leaving group, causing a simultaneous breaking of the carbon-leaving group bond. This process involves a backside attack, where the nucleophile approaches from the side opposite to the leaving group, leading to a direct inversion of the stereochemistry at the reaction center.

If the reacting carbon atom is highly substituted with bulky groups, the nucleophile will experience significant steric hindrance and have a harder time approaching the reaction site, reducing the rate of the reaction.

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From the given options let's select the example which shows a conceptual model.

A conceptual model can be said to be a model which shows an abstract representation of any concept which can be visualized or imagined than other models.

It is a model which the designers want users to understand.

From the list, the best option which is an example of a conceptual model is a mental image of gas molecules as tiny balls.

Let's say, for example, you imagine or have a mental picture of gas molecules using your imagination, it helps to understand how a vacuum system works and you can easily solve the problem if something goes wrong.

Therefore, the example of a conceptual model is:

A mental image of gas molecules as tiny balls.

• ANSWER:

A. mental image of gas molecules as tiny balls

A circuit that changes alternating current to direct current, but only produces a direct current output for one-half of the AC sine wave is a Half-wave rectifier circuit.

A half-wave rectifier is a circuit that converts AC (alternating current) to DC (direct current), but it only produces a DC output for one-half of the AC sine wave cycle. During the positive half of the AC cycle, the diode in the circuit allows current to flow, but during the negative half of the cycle, the diode blocks the current. This results in a DC output that is only present during the positive half of the AC cycle, creating a pulsating DC waveform.

While a half-wave rectifier is simple and inexpensive, it has a lower efficiency and produces more ripple compared to other types of rectifiers like full-wave rectifiers and bridge rectifiers. Inverters, on the other hand, convert DC to AC, and are not applicable to this question.

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7. Gravitational force is an attractive force that always exists between any two objects with mass. Gravitational fields are usually studied on a macroscopic scale, such as with planets and stars

8. Planets orbit stars because of the gravitational force between them.

9. The strength of an object's gravitational field is determined by its mass and distance from other objects.

Gravitational force  is described as the  force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.

The gravitational force of the star attracts the planet towards it which makes it tp move  in a curved path around the star.

The gravitational force between the planet and the star is the reason why the planet move in an elliptical orbit around the star.

The strength of an object's gravitational field is determined by its mass and the distance between it and other objects, and has an important function of shaping the dynamics and structure of the universe.

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Answer:

0.81 m/s^2

Explanation:

A child rides a bicycle from rest

The child reaches a velocity of 3.8m/s

The time is 4.7 secs

Therefore the acceleration can be calculated as follows

v= u + at

3.8= 0 + a(4.7)

3.8= 0 + 4.7a

3.8-0= 4.7a

3.8= 4.7a

a= 3.8/4.7

= 0.81 m/s^2

Hence the acceleration is 0.81 m/s^2

Answer:

The answer is 0km

Explanation:

Answer:

A. Millimeters

Explanation:

C. is a unit of weight-wrong

D. is a unit of volume-wrong

B .kilometers are too large

Answer: A. Millimeters

Explanation:

Because it is more reasonable

The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

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If the mass of a glider in an oscillatory system is doubled while assuming no damping, the period of oscillation would remain unchanged.

The period of oscillation (T) is the time taken for one complete cycle of oscillation, which is independent of the mass of the object in simple harmonic motion. The period is determined by other factors such as the stiffness of the system and the restoring force acting on the object.

In a simple harmonic oscillator, the period is given by the equation:

T = 2π * √(m/k)

Where m is the mass of the object and k is the spring constant or the stiffness of the system.

Doubling the mass of the glider would increase the numerator of the equation by a factor of 2, but it would also increase the denominator by the same factor since the spring constant remains constant. As a result, the ratio of mass to stiffness remains the same, and the square root of that ratio (which represents the period) also remains the same.

Therefore, doubling the mass of the glider would not affect the period of oscillation, and it would remain unchanged.

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Answer:

709.5 cal

Explanation:

masa m de la barra de aluminio = 100 g

temperatura ambiente = 27 ° C

Asumiremos que la barra de aluminio está en equilibrio térmico con el ambiente.

Esto significa que la temperatura inicial de la barra es de 27 ° C

temperatura final a la que la barra debe calentarse = 60 ° C

el aumento de temperatura ΔT será

ΔT = 60 ° C - 27 ° C = 33 ° C

capacidad calorífica específica c del aluminio = 0.215 cal/g°C

Calor C requerido = mcΔT

C = 100 x 0.215 x 33 = 709.5 cal

The irrigation frequency is approximately 88.89 and the irrigation period is 3000 hours.

I. To determine the localized ETc (crop evapotranspiration) at peak demand for matured grape plantation, we can use the following formula:

ETc = ETo × Kc × Kr × Groundcover

Given:

ETo (reference evapotranspiration) at peak demand = 6.5 mm/d

Kc (crop coefficient) = 1.2

Kr (reduction coefficient) = 0.94

Groundcover = 80% (0.8)

Calculating:

ETc = 6.5 × 1.2 × 0.94 ×0.8

ETc = 5.11744 mm/d

Therefore, the localized ETc at peak demand for the matured grape plantation is approximately 5.12 mm/d.

II. To calculate the peak net and gross water requirements for mango plantation on sandy soil, we use the formula:

Net Requirement = ETc / Ks

Gross Requirement = Net Requirement / EU

ETc (localized ETc) = 5.12 mm/d

Ks (soil water stress coefficient) = 0.91

EU (water use efficiency) = 85% (0.85)

Calculating Net Requirement:

Net Requirement = 5.12 / 0.91

Net Requirement = 5.62 mm/d

Calculating Gross Requirement:

Gross Requirement = 5.62 / 0.85

Gross Requirement = 6.62 mm/d

Therefore, the peak net water requirement for mango plantation on sandy soil is approximately 5.62 mm/d, and the peak gross water requirement is approximately 6.62 mm/d.

b. To determine the number of emitters per plant, we can use the following formula:

Number of emitters = Wetted area per plant / Wetted area per emitter

Tree spacing = 6 m x 6 m

Percent wetted area (Pw) = 50%

Wetted area for sandy soil = 2 m²

Calculating Wetted area per plant:

Wetted area per plant = Tree spacing ×Tree spacing ×Pw

Wetted area per plant = 18 m²

Calculating Number of emitters per plant:

Number of emitters per plant = Wetted area per plant / Wetted area per emitter

Number of emitters per plant = 18 / 2

Number of emitters per plant = 9 emitters

Therefore, the number of emitters per plant is 9.

c. To determine the irrigation frequency and irrigation period, we need to consider the effective rooting depth, soil available moisture content, manageable allowable depletion, and drip emitter discharge.

Effective rooting depth = 1000 mm

Soil available moisture content = 15 cm/m

Manageable allowable depletion = 25% (0.25)

Drip emitter discharge = 0.005 m³/h

Calculating Irrigation Frequency:

Irrigation Frequency = Effective Rooting Depth / (Soil Available Moisture Content × (1 - Manageable Allowable Depletion))

Irrigation Frequency = 1000 / (15 × (1 - 0.25))

Irrigation Frequency = 1000 / (15 × 0.75)

Irrigation Frequency = 1000 / 11.25

Irrigation Frequency ≈ 88.89

Calculating Irrigation Period:

Irrigation Period = Wetted Depth / Drip Emitter Discharge

Irrigation Period = 15 / 0.005

Irrigation Period = 3000 hours

Therefore, the irrigation frequency is approximately 88.89 and the irrigation period is 3000 hours.\

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If a particle moves along a straight line, if the velocity of the particle v = 2t², then the acceleration versus time graph will be a straight line, therefore the correct answer is option C,

The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².

As we know the rate of change of velocity is known as acceleration

acceleration =change in velocity/change in time

As given in the problem If a particle moves along a straight line, if the velocity of the particle v = 2t²,

acceleration = dv/dt

                     =d ( 2t²)/dt

                     =4t

Thus, the acceleration versus time graph would be a straight line.

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Answer:

1)  A = 0.25 m², 2) V = 0.5 m³, 3)   m = 1500 kg, 4) W = 14700 N,

5)  P = 58800 Pa

Explanation:

1) The area of ​​the base is square

          A = L²

         A = 0.5²

         A = 0.25 m²

2) The block is a parallelepiped

         V = A h

         V = 0.25 2

          V = 0.5 m³

3) Density is defined

           rho = m / V

           m = rho V

           m = 3000 0.5

           m = 1500 kg

4) The weight of a body is

           W = mg

            W = 1500 9.8

            W = 14700 N

5) The pressure is

             P = F / A

in this case the force is equal to the weight of the body

              P = 14700 / 0.25

              P = 58800 Pa

(1) The area of the base of the block is 0.25 m².

(2) The volume of the block is 0.5 m³.

(3) The mass of the block is 1500 kg.

(4) The weight of the block is 14,700 N.

(5) The pressure exerted by the block is 58,800 N/m²

The given parameters;

The area of the base of the block is calculated as follows;

\(A = 0.5 \ m \ \times 0.5 \ m\\\\A = 0.25 \ m^2\)

The volume of the block is calculated as follows;

\(V = Ah\\\\V = 0.25 \times 2\\\\V = 0.5 \ m^3\)

The mass of the block is calculated as follows;

\(\rho = \frac{m}{V} \\\\m = \rho V\\\\m = 3000 \times 0.5\\\\m = 1500 \ kg\)

The weight of the block is calculated as follows;

\(W = mg\\\\W = 1500 \times 9.8\\\\W = 14,700 \ N\)

The pressure exerted by the block is calculated as follows;

\(P = \frac{F}{A} \\\\P = \frac{14,700}{0.25} \\\\P = 58,800 \ N/m^2\)

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While energy conservation is crucial, the energy change experienced by the surroundings and the system can differ depending on the process involved.

It's important to address misconceptions in the study of energy, systems, and surroundings. Among the statements you've mentioned, the one that is not true is:

"The surroundings experience the same energy change as the system in order to keep the total energy in the universe constant."

In reality, the energy change experienced by the surroundings may not be equal to the energy change of the system. The total energy in the universe is conserved, but the distribution of that energy between the system and surroundings can vary. The system, which is the focus of thermochemical study, can be a chemical reaction occurring in a sample of matter. During this process, energy can be transferred between the system and surroundings through work or heat.

The surroundings can indeed provide thermal energy to the system, allowing the system to absorb heat or undergo an endothermic reaction. Conversely, the system can also release thermal energy to the surroundings in an exothermic reaction. Moreover, the system can do work on the surroundings, transferring energy through mechanical means or other types of work.

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The radioulnar joint is a synovial joint located at the elbow that connects the radius and the ulna, enabling rotational motion.

The radioulnar joint allows for pronation and supination. Pronation refers to the motion of rotating the forearm so that the palm faces downwards, while supination refers to the motion of rotating the forearm so that the palm faces upwards. The radioulnar joint allows the radius and ulna to move relative to each other, resulting in rotational motion.

When the forearm is pronated, the radius rotates over the ulna and crosses it, while the ulna remains stationary. When the forearm is supinated, the radius rotates back to its original position, and the two bones are parallel to each other.The radioulnar joint is important in many activities, including writing, typing, playing musical instruments, and sports like tennis and golf. Any damage to this joint can result in a loss of pronation and supination, making daily activities challenging.

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Answer:

they would repel because they have the same charge. Charges that are different will stick together.