Define Fundamental unit and Derived Unit

Answer:

The untrue option is C: "More arrowheads on lines mean a brighter light"

Explanation:

Ray diagrams are used to show how the light behaves with things like mirrors or lenses. Where we only study how the direction of the light changes when it interacts with these objects.

The "light" is represented with arrows, where again, the only thing we care is the direction of the light, so the first statement is true, the arrowheads show the direction of the light, and only that.

The intensity of the light, in this context, has no effect on how light behaves, so there is not a necessity of representing the intensity of the light, thus, more arrowheads on lines do not mean a brighter light. It may only be used to represent changes in direction of the light.

Finally, we know that light travels in straight pats (the pats can be curved in some cases, like with large gravitational fields, but this is not the case of a ray diagram) so the lines that represent the light should always be straight, thus option B is also true.

The untrue option is C: "More arrowheads on lines mean a brighter light"

The three main approaches to the identification of unknown bacteria are as follows:Phenotypic identification, Molecular identification and Biochemical identification

1. Phenotypic identification

Phenotypic identification involves the physical and chemical characteristics of the bacterial colonies and cells. In this method, bacterial cells are studied through microscopy, their ability to grow on various types of media, cellular morphology, and other factors that are easy to observe.

2. Biochemical identification

Biochemical identification is based on the biochemical reactions of bacteria. This method involves the use of different chemical and biochemical tests to identify the bacteria. The tests are designed to identify specific enzymes or metabolic pathways. The results of the tests are then used to identify the bacteria.

3. Molecular identification

Molecular identification involves the use of DNA analysis to identify bacteria. In this method, the DNA of the bacterial cells is isolated and analyzed. This method has become popular in recent years due to its accuracy and speed.

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Answer:

(a) Kinetic energy of the cart is 648.32 J.

(b) Speed of the cart is 11.44 m/s.

Explanation:

From the attached below figure we came to know that,

Mass of the crate is 10 kg (m)

Initial speed of the crate is 1.2 m/s (v)

Coefficient of friction on a rough plane is 0.286 (µ)

Force on the cart is 150 N (F)

The distance which crate is moved (d) is 8.05 m.

Calculation of kinetic energy:

Acceleration of the cart:

We know that,

F = F – m × g × sinθ - µ × m × g × cosθ (F = ma)

m × a =  F – m × g × sinθ - µ × m × g × cosθ

10 × a = 150 – (10 × 9.8 × sin 27) – (0.286 × 10 × 9.8 × cos 27)

10 × a = 150 – 44.49 – 24.97

10 × a = 80.54

Calculation of speed:

Change in kinetic energy = m × a × d

Change in kinetic energy = 10 × 8.054 × 8.05

Change in kinetic energy = 648.32 J

Explanation:

The volumetric water content is greater than the gravimetric water content for a given mass of soil and water in a clay loam soil.

The gravimetric water content is the ratio of the mass of water to the mass of dry soil, expressed as a percentage. It represents the amount of water in relation to the total mass of soil.

The volumetric water content, on the other hand, is the ratio of the volume of water to the total volume of soil, expressed as a decimal or percentage. It represents the amount of water in relation to the total volume of soil.

Since water has a higher density than soil particles, a given mass of soil and water will occupy a larger volume when the water is included. Therefore, the volumetric water content will be greater than the gravimetric water content.

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Answer:

3.94

Explanation:

divide total mass by the number of blocks since they are identical

Answer:

3.94

Explanation:

You want to find the mass of one block. Since we know there is 8 blocks with the same mass, you can divide the total mass by 8 since the mass is equally distributed within the 8 blocks

Answer:

a constabt force that acts on object that rub together

Explanation:

It is because Friction is the rubbing of one body against another body

A battery is an electrochemical device that generates electricity from a chemical reaction. It typically consists of two electrodes, an anode and a cathode, separated by an electrolyte, which is a solution or medium that conducts ions.

The chemical reaction between the electrodes and the electrolyte generates a flow of electrons, which can be harnessed to power electrical devices.The flow of electrons generated by the chemical reaction in a battery is a one-way process and cannot be reversed. When the battery is connected to a circuit, the electrons flow from the anode to the cathode, producing an electrical current.

However, the reverse flow of electrons, from the cathode to the anode, cannot be achieved by simply reversing the direction of the current. This is because the chemical reaction that generates the flow of electrons is not reversible.Different types of batteries use different chemical reactions to generate electricity. For example, alkaline batteries use zinc as the anode and manganese dioxide as the cathode, while lead-acid batteries use lead as the anode and cathode and sulfuric acid as the electrolyte.

Lithium-ion batteries, which are commonly used in portable electronic devices, use lithium ions as the charge carriers and graphite as the anode.In conclusion, a battery is an electrochemical device that generates electricity from a chemical reaction and cannot be run in reverse. The chemical reaction is a one-way process that generates a flow of electrons from the anode to the cathode, producing an electrical current that can be used to power electrical devices.

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According to the giant impact theory, a giant Mars-sized object collided with Earth. This collision likely resulted in the spinning of the earth, which creates the length of the day on Earth.

The impact of the Mars-sized object caused a tremendous release of energy and angular momentum. This led to the spinning of the early Earth, which was initially in a molten state due to the extreme heat generated by the collision. As the debris from the impact settled and formed the Moon, the spinning of the Earth continued and eventually played a crucial role in the formation and stabilization of the Earth-Moon system.

The Earth's rotation rate changed as a result of the enormous impact's momentum transfer to it, as was previously mentioned. The impact accelerated Earth's spin, shortening days compared to those we currently experience. The Earth's rotation has slowed down over time as a result of tidal interactions with the Moon and Sun, which nevertheless have an impact on the length of a day. However, the original collision had a considerable impact on the early Earth's rotation rate, which in turn affected how long a day was at that time.

Hence, According to the giant impact theory, a giant Mars-sized object collided with Earth. This collision likely resulted in the spinning of the earth, which creates the length of the day on Earth.

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#Complete question is:

According to the giant impact theory, a giant Mars-sized object collided with Earth. This collision likely resulted in the ______ which creates _______ on Earth.

1st blank options:

craters on the moon

spinning of earth

formation of mars

tilting of earth's axis

2nd blank options:

tides

seasonal changes

length of a day

rotation

Answer: False

Explanation: You'll be able continuously tell a blend, since each of the substances can be isolated from the group in numerous physical ways. You'll be able continuously get the sand out of the water by sifting the water absent. Some of the time a blend partitioned on their possess eg. water & cooking oil.

The equivalent capacitance (\(C_{eq}\)) of an electrical circuit containing four capacitors which are connected in parallel is equal to: A. 21 F.

Basically, the components of an electrical circuit can be connected or arranged in two forms and these are;

A parallel circuit can be defined as an electrical circuit with the same potential difference (voltage) across its terminals. This ultimately implies that, the equivalent capacitance (\(C_{eq}\)) of two (2) capacitors which are connected in parallel is equal to the sum of the individual (each) capacitances.

Mathematically, the equivalent capacitance (\(C_{eq}\)) of an electrical circuit containing four capacitors which are connected in parallel is given by this formula:

Ceq = C₁ + C₂ + C₃ + C₄

Substituting the given parameters into the formula, we have;

Ceq = 10 F + 3 F + 7 F + 1 F

Equivalent capacitance, Ceq = 21 F.

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By the definition of wavelength, the answer is the letter D, the wavelength would decrease.

We can see in the diagram a wave motion.

A wave has some characteristics:

Now, if we increase the distance of the crests, by the definition shown above, we will increase the wavelength.

Therefore, the answer is letter D, the wavelength would increase.

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1) The final check sum of the word (110011) using right rotation of the six bits by using cyclic exclusive-OR checksum is c. 000001. Hence, the correct option is c. 000001.

2) According to a compiler, something appears to be wrong, in the form of a warning. Therefore, the correct option is D. warning.

3) The method through which a system directs, regulates, or commands itself in PLC is Close-loop. Therefore, the correct option is B. Close-loop.

The result (MCQ) of the following output are as follows:

1. By using cyclic exclusive-OR checksum find the final check sum of the word (110011) using right rotation of the six bits,The final check sum of the word (110011) using right rotation of the six bits by using cyclic exclusive-OR checksum is c. 000001. Hence, the correct option is c. 000001.

2. Something appears to be wrong, according to a compiler.According to a compiler, something appears to be wrong, in the form of a warning. Therefore, the correct option is D. warning.

3 The method through which a system directs, regulates, or commands itself in PLC. The method through which a system directs, regulates, or commands itself in PLC is Close-loop. Therefore, the correct option is B. Close-loop.

So, the correct answer to question 1,2 and 3 are C, D, and B respectively.

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Answer:

density=mass/volume

density=19.3

mass=x

volume=100

we are looking for mass so we have to change the subject formula to m=dv

which means mass is equals to density multiplied by volume

m= 19.3 x 100

which is 1930.

The highest energy is the light with a short wavelength. Red has the least value since it has the shorter wavelengths of all visible light. Violet light has the shortest wavelength of all visible light, giving it the most energy. The longest wavelength and lowest energy are found in radio waves.

To find the angle at which the ball enters the basket, we need to use the equations of motion for projectile motion. The equations are:
y = y0 + v0y*t - (1/2)*g*t^2
x = x0 + v0x*t
where y is the vertical position, y0 is the initial vertical position, v0y is the initial vertical velocity, g is the acceleration due to gravity, t is the time, x is the horizontal position, x0 is the initial horizontal position, and v0x is the initial horizontal velocity.

The ball enters the basket at an angle of 0° to the horizontal.

We know that
y0 = 2.4 m, v0 = 12 m/s, θ0 = 35°, and g = 9.8 m/s^2. We can find v0x and v0y using the angle:
v0x = v0*cos(θ0) = 12 m/s*cos(35°) = 9.82 m/s
v0y = v0*sin(θ0) = 12 m/s*sin(35°) = 6.92 m/s
The ball enters the basket when y = 0, so we can set the equation for y equal to 0 and solve for t:
0 = 2.4 m + 6.92 m/s*t - (1/2)*9.8 m/s^2*t^2
Using the quadratic formula, we find that t = 0.74 s or t = -0.63 s. We discard the negative value, so t = 0.74 s.
Now we can use the equation for x to find the horizontal position of the basket:
x = x0 + v0x*t = 0 + 9.82 m/s*0.74 s = 7.27 m
Finally, we can use the equation for the tangent of the angle to find the angle at which the ball enters the basket:
tan(θ) = y/x = 0/7.27 m = 0
θ = tan^-1(0) = 0°

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We will have that the flux density will be:

The position of the mass when t = π is zero.The amplitude of vibrations after a very long time is zero.

To solve this problem, we'll use the principles of harmonic motion and the equation of motion for a mass-spring system. The equation of motion for a mass-spring system without damping is given by:

m * x''(t) + k * x(t) = F(t)

Where:

- m is the mass of the object (5 kg in this case)

- x(t) is the position of the object as a function of time

- k is the spring constant (80 N/m in this case)

- F(t) is the applied force as a function of time

Let's solve the problem step by step:

(a) Finding the position of the mass when t=π:

To find the position of the mass at t = π, we need to solve the equation of motion. However, first, we need to find the particular solution for the given applied force f(t) = 30e^(-2t) * cos(5t).

The particular solution can be assumed to have the form:

x_p(t) = A * cos(5t + φ)

where A is the amplitude and φ is the phase angle.

Differentiating x_p(t) twice with respect to time gives:

x''_p(t) = -25A * cos(5t + φ)

Substituting the particular solution into the equation of motion, we get:

m * (-25A * cos(5t + φ)) + k * (A * cos(5t + φ)) = f(t)

Simplifying the equation, we have:

-25m * A * cos(5t + φ) + k * A * cos(5t + φ) = f(t)

Comparing the coefficients of cos(5t + φ) on both sides of the equation, we get:

(-25m + k) * A = 0

Since A cannot be zero (as it represents the amplitude of vibration), we have:

-25m + k = 0

-25 * 5 + 80 = 0

-125 + 80 = 0

-45 ≠ 0

Therefore, there is no steady-state solution for this particular force. The position of the mass at t = π is determined by the homogeneous solution, which represents the natural vibrations of the mass-spring system.

The homogeneous solution for the equation of motion is given by:

x_h(t) = B * cos(ωt) + C * sin(ωt)

where ω = √(k/m) is the angular frequency, B and C are constants determined by initial conditions.

Since the mass comes to rest in the equilibrium position, we have x(0) = 0 and x'(0) = 0.

Substituting these initial conditions into the homogeneous solution, we get:

x_h(0) = B * cos(0) + C * sin(0) = B = 0

x'_h(0) = -B * ω * sin(0) + C * ω * cos(0) = C * ω = 0

Since ω ≠ 0 (as k and m are both positive), C must be zero:

C * ω = 0

C * √(k/m) = 0

C = 0

Therefore, the homogeneous solution is x_h(t) = 0.

As a result, the position of the mass at t = π is x(π) = x_h(π) + x_p(π) = 0 + 0 = 0.

Hence, the position of the mass when t = π is zero.

(b) Finding the amplitude of vibrations after a very long time:

In the absence of

damping, the system will continue to vibrate indefinitely. In the long run, the amplitude of vibrations will be determined by the particular solution since the homogeneous solution decays to zero.

The particular solution is x_p(t) = A * cos(5t + φ).

As t approaches infinity, the exponential term in the applied force f(t) = 30e^(-2t) * cos(5t) tends to zero, leaving only cos(5t). Therefore, the amplitude of vibrations after a very long time is determined by the amplitude of the cosine function.

The amplitude of a cosine function is equal to the absolute value of its coefficient. In this case, the coefficient of cos(5t) is 30e^(-2t). As t approaches infinity, e^(-2t) approaches zero, resulting in an amplitude of zero.

Therefore, the amplitude of vibrations after a very long time is zero.

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The assumption that the system has no internal energy and that the force is applied uniformly is made to solve this problem.

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Answer:

A. Rock cycle

Explanation:

Because it really is the change of a rock from another, like ingenuous, sedimentary rock..

Assuming that the magnifying glass is being used as a simple magnifier, the magnification provided by the magnifying glass can be calculated as:

m = 1 + (d/f)

where m is the magnification, d is the distance between the object and the lens, and f is the focal length of the lens.

In this case, d = 13.2 cm and f = 15.0 cm, so:

m = 1 + (13.2 cm / 15.0 cm)

m = 1.88

This means that the image of the splotch of color will appear 1.88 times larger than its actual size when viewed through the magnifying glass.

It's worth noting that if the object is located outside the focal length of the lens, the magnification formula becomes:

m = -d/f

and the image will be inverted.

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An art historian examines a splotch of color on an old painting with a magnifying glass that has a focal length of 15.0 cm. The magnifying glass is held 13.2 cm away from the spot under investigation. What is the magnification produced by the magnifying glass, and what does it indicate about the size of the splotch of color as seen through the magnifying glass compared to its actual size?

Answer:

Soccer ball is a body at rest and does not move(because of inertia of rest) unless a force is applied on it

Explanation:

thanks for question

The correct answer is B. According to Newton's law of universal gravitation, the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

In simpler terms, as objects get closer together, the gravitational force between them increases.

When the distance between two objects decreases, the denominator of the equation (distance squared) becomes smaller, resulting in a larger force. Conversely, when the distance increases, the denominator becomes larger, resulting in a smaller force.

It is important to note that the mass of an object does not directly affect the strength of the gravitational force between two objects. However, a higher mass will lead to a greater gravitational force when compared to a lower mass, but only because the force is being exerted on a more massive object. The mass of an individual object doesn't directly affect the gravitational force it experiences from another object. option B

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Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength

The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.

As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.

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Answer:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

The least resistance that can be attained by four 12-ohm resistors is 3 ohms. This can be achieved by connecting the resistors in a series-parallel combination, where two resistors are connected in series and then these combinations are connected in parallel.

To understand this, we can consider the equivalent resistance of two resistors in a series, which is the sum of their individual resistances. Therefore, two pairs of resistors in series will have an equivalent resistance of 24 ohms each. When these two pairs are connected in parallel, the equivalent resistance will be given by the formula:

1/Req = 1/R1 + 1/R2

Substituting the values, we get:

1/Req = 1/24 + 1/24 = 1/12

Req = 12 ohms

Thus, the least resistance that can be attained with these resistors by connecting them in various ways is 3 ohms.

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The outermost atomic shell of an atom contains the elements with only a few valence electrons that are listed on the periodic table.

The building blocks of the atom are the electron, proton, and neutron. A core nucleus with neutrons and protons makes up the atom. Around the nucleus, electrons spin. Protons are positively charged, neutrons are neutral, and electrons are negatively charged.

An electron is a negatively charged subatomic particle. In an atom, electrons are located in orbits that around the nucleus. An atom's subatomic particles cannot be seen. Thus, an electron is invisible to us.

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Answer:

sun,fire

Explanation:

The main source of heat is sun. It is because there is so much pressure in the core of sun that nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat and light.

Answer:

A: It decreased trade because soldiers no longer protected the oases.

I took it on E2020. I hope I've helped. If you need further explanation, please comment below.  

Answer:

Yes it is A

It decreased trade because soldiers no longer protected the oases.

Explanation: