SECTION B : Write TRUE or FALSE in the space provided. [10 mks]
16. Magnetic materials can attract each other. True/False
17. A piece of magnetic material can be repelled can be repelled by a
magnet. True/False
18. A magnet can be demagnetized by heating it up or hitting it with
a hammer. True/False
19. The point at which the magnetic field of two similar poles of two
different magnets cancelled out is the line of force. True/False
20. The magnetic field of a bar magnet is strongest at the poles.
True/False
21. When a magnetic material is not magnetized, the domains are
pointing in lots of different directions. True/False
22. Colour filters absorb all the colours of light except the colour that
they transmit. True/False
23. Light is refracted 9 times when it passes through a prism.
True/False
24. When the angle of incidence is bigger than the critical angle, total
internal reflection occurs. True/False
25. When the rays of light travels from a denser medium to a less
dense medium, it speeds up. True/False

Answer all questions pls this will be deleted in 9 hours

Answer:

The Object distance is 53.125cm. So the right option will be Option (c)

Explanation:

The converging lens has focal length positive, so it means:

            f=17cm

As the real image is formed so the distance of the image will be taken as positive. Let it is represented by q, So:

           q=25cm

Let the distance of object is p, it will obtained from the following formula:

Answer:

\(\boxed {\boxed {\sf \frac {8}{3} \ m/s^2 \ and \ not \ higher \ than \ the \ car's \ acceleration }}\)

Explanation:

Acceleration is the rate of change of velocity with respect to time. It is calculated by dividing the change in velocity by the time.

\(a= \frac {v_f-v_i}{t}\)

1. Motorist Acceleration

The motorist accelerates from an initial velocity of 0 meters per second to a final velocity of 8 meters per second in 3 seconds.

Substitute the values into the formula.

\(a= \frac{ 8 \ m/s - 0 \ m/s }{3 \ s}\)

Solve the numerator.

\(a= \frac{8 \ m/s}{3 \ s}\)

\(a= \frac{8}{3} \ m/s^2\)

\(a \approx 2.667 \m/s^2\)

2. Car Acceleration

The car accelerates from an initial velocity of 0 meters per second to a final velocity of 30 meters per second in 6 seconds.

Substitute the values into the formula.

\(a= \frac{ 30 \ m/s - 0 \ m/s }{6 \ s}\)

Solve the numerator.

\(a= \frac{30 \ m/s}{6 \ s}\)

\(a= { 5 \ m/s^2}\)

The motorist's acceleration is 8/3 or approximately 2.667 meters per second squared. This is not higher than the car's acceleration of 5 meters per second squared.

true

Explanation:

this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons

Answer:

Argon

Explanation:

Argon, an inert gas, is the third most abundant gas in the atmosphere.

Answer:

The astronaut's mass is 16 kg.

Explanation:

Mass can be defined as a measure of the amount of matter an object or a body comprises of. The standard unit of measurement of the mass of an object or a body is kilograms.

Irrespective of the location of an object or a body at a given moment in time, the mass (amount of matter that they're made up of) is constant. This ultimately implies that, whether you're in the moon, space, earth or any other place, your mass remains the same (constant).

Therefore, if an astronaut has a mass of 16 Kg on Earth, his mass on the moon and on the space station would remain the same, as his original mass of 16 Kg because mass is indestructible.

The net force acting on the sled if the tension force in the rope is 260 N and the total weight of the sled is 470N is

θ = 30°

Tension, T = 260 N

Weight, W = 470 N

Weight, W = Normal force, N = 470 N

Resolving T into its horizontal and vertical components,

\(T_{x}\) = T cos θ

\(T_{y}\) = T sin θ

Since velocity is constant, acceleration will be zero.

∑ \(F_{x}\) = 0

\(T_{x}\) - \(F_{k}\) = 0

T cos θ = \(F_{k}\)

\(F_{k}\) = 260 * cos 30°

Frictional force, \(F_{k}\) = 226.2 N

Net force, F = T - \(F_{k}\)

F = 260 - 226.2

F = 33.8 N

Therefore, the net force acting on the sled is 33.8 N

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Elijah McCoy, a Canadian-born inventor and engineer, patented an automatic lubricator for steam engines on July 12, 1872.

McCoy's lubricator was designed to improve the efficiency and performance of steam engines by automatically applying a consistent and controlled amount of lubrication to engine parts, thereby reducing wear and tear and increasing the lifespan of the equipment.

This invention was a significant contribution to the steam engine industry, as prior to its invention, steam engines required manual lubrication, which was time-consuming and often inconsistent.

McCoy went on to patent over 50 other inventions during his lifetime, many of which were related to lubrication systems for various types of machinery. His innovations greatly influenced the development of modern lubrication technology.

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r

\(- \frac{mR^2 }{I } \ v\)Answer:

a)      w = - \(\frac{m r }{I} v\)  ,  b)   W = - ½ m_woman R² (1 + m_woman R / I²) v²

Explanation:

a) To solve this exercise, let's use the conservation of angular momentum.

We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved

initial instant. Before starting to move the woman

         L₀ = 0

final instant. After starting to move

         L_f = I w + m v r

the moment is preserved

        L₀ = L_f

         0 = Iw + m v r

         w = - \(\frac{m r }{I} v\)                    (1)

the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise

b) for this part we use the relationship between work and kinetic energy

        W = ΔK

in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables

         v = w r

we substitute

          W = 0 - ½ I_total w²

          I_total = I + m_{woman} R²

          W = - ½ (I + m_woman R²)  ( \(\frac{m_{woman} R}{I} \ v\)) ²

          W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²

          W = - ½ m_woman R² (1 + m_woman R / I²) v²

Answer:

As newton's 1st Law states that " A body tends to be at rest or in motion until an external force is  applied "

Explanation:

so football will remains at rest until you kick it or stop it with your hands

Answer:

Explanation:

1) The time of flight equation for projectile motion can be used here to find total time in air.

t = 2vsin∅ / g

where v is speed, Ф is launch angle

t = 2×4×sin 60 / 9.8

t = 0.71 seconds

2) Distance where it hit the ground is called as range and has the following standard equation

D = v² sin2Ф/g

D = 4²sin 2×60 / 9.8

D = 1.41m

3) Maximum elevation is maximum time reached

h = v² sin²Ф / 2g

h = 4²sin² 60 / 2*9.8

h = 0.61 m

To determine the partial vapor pressure of benzene in a mixture at 50 °C, we need additional information, such as the mole fraction of benzene in the mixture and the vapor pressure of pure benzene at that temperature.

Raoult's law relates the partial vapor pressure of a component in an ideal mixture to its mole fraction and the vapor pressure of the pure component. If we have the mole fraction of benzene (Xbenzene) and the vapor pressure of pure benzene at 50 °C (Pbenzene), we can use Raoult's law to calculate the partial vapor pressure of benzene (Pbenzene_partial) in the mixture: Pbenzene_partial = Xbenzene * Pbenzene .The mole fraction of benzene (Xbenzene) represents the fraction of the total moles of the mixture that are benzene molecules. It ranges from 0 to 1, with 0 indicating no benzene present and 1 indicating that the entire mixture consists of benzene.

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Gas particles can change to solid particles if the temperature decreases.

The state of matter of a substance is determined by its temperature and pressure. When the temperature of a gas decreases, its particles lose kinetic energy and slow down. This decrease in kinetic energy leads to a decrease in the average speed of gas particles.

As the temperature continues to decrease, the particles lose energy and move closer together. At a certain temperature known as the condensation point or the freezing point, the gas particles no longer have enough energy to overcome the intermolecular forces holding them together.

At this point, the gas undergoes a phase transition and changes into a solid. The process of gas turning into a solid is called condensation or freezing, depending on the specific substance.

During condensation, the gas particles arrange themselves in a more orderly and structured manner, forming a solid. The transition from gas to solid involves the release of energy, known as heat of fusion.

In summary, when the temperature of a gas decreases below its condensation or freezing point, the gas particles lose energy, slow down, and eventually come together to form a solid.

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When a knowledgeable amateur astronomer tells you that she has a 14-inch telescope, the number 14 refers to the diameter of the telescope’s objective lens.

A telescope is a device used to view distant objects by utilizing electromagnetic radiation to either magnify their apparent size or gather more light than the human eye can. Telescopes are used for scientific, commercial, and amateur purposes. The telescope comprises an objective lens or mirror and an eyepiece to magnify the images created by the objective. Most telescopes have a viewfinder to make it simpler to aim the telescope precisely at the object of interest. They may also have a motorized mount to track celestial objects as they move across the sky.

Telescopes come in a variety of sizes, designs, and shapes and they range from large observatory telescopes to handheld amateur models. They are often classified into two types, reflecting and refracting telescopes and the size of a telescope is determined by the diameter of its objective lens or mirror. The bigger the diameter, the more light the telescope can collect, and the clearer the image. The diameter of the objective is the most significant aspect of a telescope when it comes to observing the heavens. For instance, a 14-inch telescope has an objective lens with a diameter of 14 inches, this large lens is capable of collecting a lot of light and providing clear images, making it a perfect tool for viewing the night sky.

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Given data:

Speed of baseball, v = 22 m/s

(a) Calculation of the height reached by baseball: We can use the formula for height: `h = u^2/(2*g)`where u is the initial velocity and g is acceleration due to gravity. u = 22 m/s (initial velocity)g = 9.8 m/s² (acceleration due to gravity)h = ?Now, put the given values in the above formula and solve it: h = (22 m/s)²/(2 * 9.8 m/s²) = 25.05 m

Therefore, the height reached by baseball is 25.05 m.

(b) Calculation of the time taken by baseball: We can use the formula for time: `t = v/u` where v is the final velocity and u is initial velocity. u = 22 m/s (initial velocity)v = 0 m/s (final velocity)Now, put the given values in the above formula and solve it: t = v/u = 0/22 = 0 s

Therefore, the time taken by baseball is 0 s.

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The wavelength of the second overtone in the pipe is twice the length of the pipe, which is 1.64 m. The distance from the center of the pipe to the nearest antinode is half the wavelength, which is 0.82 m. Converting to centimeters and rounding to one decimal place, the answer is 82.0 cm.

In a pipe open at both ends, sound waves can form standing waves with nodes and antinodes. The frequency of the second overtone is three times the fundamental frequency, and the wavelength is equal to twice the length of the pipe. Therefore, the distance from the center of the pipe to the nearest antinode is half the wavelength, which is 0.82 m. Converting this value to centimeters gives 82.0 cm, rounded to one decimal place.

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The question does not provide enough context to determine what designs and what type of mass is being referred to, making it impossible to determine what specific change would result in success for the group. Can you please provide more information or clarify the question. I can explain to you about design and the steps of design.

Design refers to the process of creating a plan, drawing, or model that specifies the details and features of an object, system, or process. It involves thinking through and making decisions about the form, function, and aesthetics of the object, as well as the materials, processes, and resources needed to produce it. In engineering, design typically involves a systematic approach that includes problem identification, research, conceptualization, prototyping, testing, and refinement. The goal of design is to create a product, system, or process that meets the desired specifications and requirements, while also considering factors such as safety, usability, sustainability, and cost-effectiveness.

The steps of designing can vary depending on the type of design project, but some general steps that are often followed include:

1. Identify the problem or need: Determine what problem or need the design will address and who the target audience or users are.

2. Research: Conduct research on the problem or need, the target audience, and any similar designs or solutions that exist.

3. Ideation: Generate ideas and concepts for the design, considering factors such as functionality, aesthetics, and feasibility.

4. Sketching and prototyping: Create rough sketches or prototypes to visualize and test the design concepts.

5. Refinement: Refine and improve the design based on feedback from testing and evaluation.

6. Finalization: Create the final design, including detailed specifications and documentation.

7. Implementation: Execute the design, which may involve manufacturing, construction, or programming.

8. Testing and evaluation: Test and evaluate the final product to ensure it meets the design specifications and functions as intended.

9. Iteration: Make any necessary changes or improvements based on feedback from testing and evaluation, and repeat the steps as needed.

Therefore, The steps of designing include identifying the problem or need, conducting research, generating ideas, prototyping, refining, finalizing, implementing, testing and evaluating, and iterating as needed.

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Answer:

Gravity force

Explanation:

Answer:

grav force

Explanation:

Answer:

..

Explanation:

Coordinate adjectives are adjectives that describe the same noun equally. They should be separated with commas. In this sentence, both red and round are describing the ball. The correct answer is, "The red, round ball is Adley's favorite toy to play with."

Force is a vector quantity hence it can be resolved into a vertical and a horizontal components.

1) The horizontal component of the applied force is given by;

Fnet = F cos θ

Fnet = 70.0N × cos (45.0)

Fnet = 49.5 N

2) The horizontal component of the frictional force is;

F = -Ff + mgsinθ

F = applied force

Ff =mgsinθ - F

Ff = (11 × 10 × sin 45) - 49.5

Ff = 28.3 N

Horizontal component of Ff

28.3 N cos 45 = 19.9 N

3) The applied force is given by;

F = 11 Kg ×  1.00m/s^2 = 11.0 N

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Answer:

Explanation:

The collision between the 93kg fullback and the 127kg defensive tackle is an example of an inelastic collision. In an inelastic collision, the total kinetic energy of the system is not conserved as some of the energy is transformed into other forms such as heat or sound. The resulting final speed of both players would be 0m/s, indicating that they have come to a stop after the collision.

Answer:

A wave in which the medium vibrates at right angles to the direction of the propagation is called transverse wave.

It was spot on. 2.54 / 10.16 cm = 4 in C.

What is Length ?

Length is a term used to describe the distance between two points on an object or the dimension of an object along a particular axis.  Length is usually measured in units of distance, such as meters, centimeters, inches, or feet.

In physics, length is an important concept used to describe the size of objects, the distance between two points, or the dimensions of a space. In engineering and construction, length is used to design and build structures, such as bridges and buildings, to ensure they are safe and fit for their intended purpose.

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The driver of the van will hear a higher pitch due to his higher relative velocity.

The relative velocity of an object is the velocity of the object with respect to a stationary observer.

If a fire engine is moving at 40 m/s and sounding its horn. Also if  A car in front of the fire engine is moving at 30 m/s, and a van in front of the car is stationary.

The relative velocity of the stationary van is calculated as;

Vv = -40m/s - 30 m/s = - 70 m/s

The driver of the van will hear a higher pitch since his combined relative velocity of both cars is 70 m/s.

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The poison was most likely found was B)arsenic

What is poisioning?

Poisoning is defined as harm or death brought on by ingesting, inhaling, touching, injecting, or ingesting different medications, chemicals, venoms, or gases. Many chemicals, including pharmaceuticals and carbon monoxide, become dangerous only when they are consumed in large quantities. While some cleaners only cause harm when consumed, others also release hazardous vapors or fumes.

When large doses of arsenic are ingested or inhaled, arsenic poisoning, also known as arsenicosis, occurs. Gray, silver, or white in hue, arsenic is a form of carcinogen. For humans, arsenic is exceedingly dangerous. Because it has no taste or odor, arsenic is particularly hazardous because you can be exposed to it covertly. After death, the toxin leaves residues on the body.

Hence the poison was most likely found was B)arsenic

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Answer: A

Explanation: When a steel ball is thrown into a viscous liquid, three forces will act on the ball.

1.) The viscous drag force V which is acting upward

2.) The buoyant force U which is acting upward and

3.) The weight of the ball W. Which is acting downward.

When it is moving with an acceleration a, the weight W will be greater than U and V

Since Force = ma.

The resultant vector force will be

W - V - U = ma

The ideal body position while driving is with the knee slightly bent from the seat while pressing the pedals. The best choice is therefore B.

What significance does proper body posture have?

The right blood flow, which supports and maintains the health of the muscles, tendons, and ligaments, depends on the body's posture.

The picture that is attached contains the entire question.The right body alignment to choose while driving aids in the development of the right control over the vehicle. When pressing the pedals, the knee should be slightly bent and the seat should be adjusted such that the bottom touches the back of the seat. So, choice B is the right one.

The ideal body position for your legs after you adjusted Seat is with your knee

A. is fully tucked in when pressing the pedals

B. is slightly crooked when pressing the pedals

C. is fully extended when pressing the pedals

D. is pressing directly on the pedals

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The magnitude of the magnetic field at point P is |B| = μ₀ * i / (2π * r)

dB = (μ₀/4π) * (i * dl x r) / (r/2)²

dB = 2 * (μ₀/4π) * (i * dl x r) / r²

dB = (μ₀/2π) * (i * dl x r) / r²

B = ∫dB = (μ₀/2π) * (i * ∫dl x r) / r²

B = (μ₀/2π) * (i * r * ∫dθ) / r²

B = (μ₀/2π) * (i * π/2) / r

B = μ₀ * i / (2π * r)

A magnetic field is a vector field that describes the magnetic influence of electric currents and magnetic materials. It is represented by lines of force that indicate the direction and strength of the magnetic field at each point in space. The magnetic field is measured in units of tesla (T) or gauss (G) and is produced by moving electric charges or by the intrinsic magnetic moment of elementary particles such as electrons and protons.

Magnetic fields have several important applications in everyday life, including electric motors, generators, and MRI machines. They are also critical to our understanding of the behavior of charged particles in space, such as the Earth's magnetic field that protects us from harmful cosmic radiation. The study of magnetic fields is an important branch of physics, known as electromagnetism, which also encompasses electric fields and their interaction with each other and with matter.

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