A simple compound microscope provides large magnification by employing

A) a short focal length objective and a short focal length eyepiece.
B) a short focal length objective and a long focal length eyepiece.
C) a long focal length objective and a short focal length eyepiece.
D) a long focal length objective and a long focal length eyepiece.

a)1. Power of the battery (P_battery): The power supplied by the battery can be calculated using the formula P = VI, where V is the voltage across the battery and I is the current flowing through it.

In a charging RC circuit, initially the voltage across the capacitor is zero, so initially the battery supplies maximum power to charge the capacitor. As time passes, the voltage across the capacitor increases and the current decreases, so the power supplied by the battery decreases.

2. Power of the resistor (P_resistor): The power dissipated by the resistor can be calculated using the formula P = I^2 * R, where I is the current flowing through the resistor and R is the resistance. In a charging RC circuit, initially the current flowing through the resistor is maximum, so the power dissipated by the resistor is also maximum. As time passes, the current decreases, so the power dissipated by the resistor decreases.

3. Power of the capacitor (P_capacitor): The power stored in the capacitor can be calculated using the formula P = dW/dt, where dW is the change in energy stored in the capacitor and dt is the change in time. In a charging RC circuit, initially the energy stored in the capacitor is zero, so the power stored in the capacitor is also zero. As time passes, the energy stored in the capacitor increases, so the power stored in the capacitor also increases.

b) From t = 0 to t → [infinity], the energy supplied by the battery can be calculated by integrating the power supplied by the battery over time. However, since the power supplied by the battery decreases as time passes, the total energy supplied by the battery will be infinite. This is because the capacitor takes an infinite amount of time to fully charge.

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The Weight of an object is more at pole and less at equator of the earth because the distance of the pole is less than the distance of the equator from the centre of the earth.

Answer:

Explanation:

Answer:

Plagiarism

Explanation:

Its using someone else's stuff and saying its yours.

\(\longrightarrow \textsf{D. A bicycle sitting on the ground} \)

Let us check all options -

In this scenario, the 1000-kg car and 2000-kg truck are colliding and the resulting wreckage has a combined mass of 3000 kg, the velocity of the wreckage just after impact is 11.67 m/s.  

The combined velocity of the two vehicles after the collision can be calculated by applying the law of conservation of momentum.

The law of conservation of momentum states that the momentum of a system remains constant if there are no external forces acting upon it.

Momentum (p) is equal to the mass (m) multiplied by velocity (v), so p = mv.

The momentum of the 1000-kg car traveling north at 15 m/s is 15000 kg m/s, and the momentum of the 2000-kg truck traveling east at 10 m/s is 20000 kg m/s.

After the collision, the momentum of the combined wreckage is the sum of the two vehicles' momentums, or 35000 kg m/s.

As the combined mass of the wreckage is 3000 kg, the velocity of the wreckage just after impact is

35000/3000

= 11.67 m/s.

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Answer:

Reorder the steps so that step 4 appears before step 3

Explanation:

In a nuclear power plant, we have;

1) Nuclear reaction between the radio active species and the particles takes place to generate energy in the nucleus of atoms

2) The nuclear energy in the atom is converted into radiant energy, which is the energy found in light, and thermal (heat) energy

3) The produced radiant and thermal energy is released as heat and light

4) With the produced heat, steam is generated

5) The generated steam turns the steam turbines and produced mechanical energy

6) The produced mechanical energy is then converted into electrical energy in the electrical generator of the power plant

To correct Savion's error, Step 4) the light and heat should be released before step 3) the released heat can be used to generate steam, we therefore reorder the steps so that step 4 appears before step 3.

Answer:

The answer is B on Edge

Explanation:

Knowing a combination of grappling and striking martial arts is highly advantageous during a street self defense scenario. This is because both grappling and striking techniques offer unique benefits that complement each other, providing a comprehensive set of skills that can be applied in various situations.

In a self defense scenario, grappling techniques, such as throws and joint locks, can be used to immobilize an opponent and prevent them from causing harm. Additionally, grappling allows for control and manipulation of an attacker's body, allowing for strategic positioning and the opportunity to escape or defend oneself.

On the other hand, striking techniques, such as punches and kicks, can be used to incapacitate an attacker quickly and efficiently. Striking can also create distance between oneself and the attacker, reducing the likelihood of further harm.

Combining these two techniques offers an added advantage, as it allows for a wider range of options depending on the situation. For example, if an attacker is too close for striking, grappling can be used to gain control of the situation. Similarly, if an attacker is too far for grappling, striking techniques can be used to keep them at bay.

In conclusion, knowing a combination of grappling and striking martial arts is highly advantageous during a street self defense scenario. Both techniques offer unique benefits that complement each other, providing a comprehensive set of skills that can be applied in various situations.

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Answer:

stars #3

Explanation:

they didn't know it was stars

Answer: Ursa Major (/ˈɜːrsə ˈmeɪdʒər/; also known as the Great Bear) is a constellation in the northern sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) she-bear," referring to and contrasting it with nearby Ursa Minor, the lesser bear.

Bordering constellations: Draco; Cameloparda...

Brightest star: ε UMa (Alioth) (1.76m)

Meteor showers: Alpha Ursa Majorids; Leonid...

Symbolism: the Great Bear

Intensity changes as a result in resultant wave.

When two waves are in phase and their maxima add, a process known as constructive interference occurs where the combined amplitude of the two waves equals the sum of their individual amplitudes. The minima of the waves would line up similarly.

A wave of amplitude 2A is produced when two waves with the same phase, frequency, and amplitude (A) superimpose. As a result, its intensity doubles. The maximum angle at which fringes can be seen on a screen is 90°.

Condition for constructive interference: ΔL = nλ, where n is any integer. The quantity I represents the wave's intensity as a function of the two (identical) parent waves' phase differences.

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The main reason a person weighs less at the equator than at the poles is due to the Earth's rotation, which causes a centrifugal force at the equator due to law of planet motion.

This centrifugal force is caused by the Earth's rotation around its axis, which is faster at the equator than at the poles. As a result, objects at the equator are moving faster and experience a weaker gravitational pull towards the Earth's center compared to objects at the poles due to law of planet motion.

The difference in gravitational force between the equator and the poles is relatively small, around 0.5%, but it is still measurable. The gravitational force at the poles is stronger because the Earth's rotation is slower there, so there is less centrifugal force pushing objects away from the Earth's center.

The influence of the Sun, Moon, and planets on a person's weight is much smaller than the effect of the Earth's rotation. These celestial bodies do have an effect on the Earth's gravitational field, but their impact is relatively minor compared to the Earth's rotation.

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Answer:

current must flow and chemical energy must take place

Let's calculate the values based on the given information:

The area of the wooden block can be calculated by multiplying the length and width of one of its faces:

Area = Length * Width

Area = 40 cm * 20 cm

Area = 800 cm²

To convert to square inches, we can use the conversion factor 1 inch = 2.54 cm:

Area in square inches = Area in square centimeters / (2.54 cm/inch)²

Area in square inches = 800 cm² / (2.54 cm/inch)²

Area in square inches ≈ 124.03 in²

The volume of the wooden block can be calculated by multiplying its length, width, and height:

Volume = Length * Width * Height

Volume = 40 cm * 20 cm * 10 cm

Volume = 8000 cm³

To convert to cubic inches, we can use the conversion factor 1 inch = 2.54 cm:

Volume in cubic inches = Volume in cubic centimeters / (2.54 cm/inch)³

Volume in cubic inches = 8000 cm³ / (2.54 cm/inch)³

Volume in cubic inches ≈ 488.19 in³

The density of the wooden block can be calculated by dividing its mass by its volume:

Density = Mass / Volume

Density = 5 kg / 8000 cm³

To convert to grams per cubic centimeter (g/cm³), we can use the conversion factor 1 kg = 1000 g:

Density in g/cm³ = Density in kg/cm³ * 1000 g/kg

Density in g/cm³ = (5 kg / 8000 cm³) * 1000 g/kg

Density in g/cm³ ≈ 0.625 g/cm³

To convert to pounds per cubic inch (lb/in³), we can use the conversion factor 1 kg = 2.20462 lb and 1 inch = 2.54 cm:

Density in lb/in³ = Density in kg/cm³ * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ = (5 kg / 8000 cm³) * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ ≈ 0.036 lb/in³

Pressure is defined as force divided by area. In this case, we need more information to calculate the pressure. If the block is subjected to a specific force, we can divide that force by the appropriate surface area to find the pressure.

The pressure on the top surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

Similarly, the pressure on the bottom surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

The force on the top surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

The force on the bottom surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

Without the values for forces on the top and bottom surfaces, we cannot determine the difference between them.

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1. The area of the wooden block can be calculated using the formula for the surface area of a rectangular prism: SA = 2(lw + lh + wh), where l, w, and h are the length, width, and height of the block, respectively. Using the given dimensions, we can find the surface area in cm²:

SA = 2(40 × 20 + 40 × 10 + 20 × 10)

SA = 2(800 + 400 + 200)

SA = 2(1400)

SA = 2800 cm²

To convert cm² to in², we can use the conversion factor 1 in² = 6.45 cm². So, the area in in² is:

2800 ÷ 6.45 = 434.96 in² (rounded to two decimal places)

2. The volume of the wooden block can be calculated using the formula for the volume of a rectangular prism: V = lwh. Using the given dimensions, we can find the volume in cm³:

V = 40 × 20 × 10

V = 8000 cm³

To convert cm³ to in³, we can use the conversion factor 1 in³ = 16.39 cm³. So, the volume in in³ is:

8000 ÷ 16.39 = 487.61 in³ (rounded to two decimal places)

3. The density of the wooden block can be calculated using the formula: density = mass/volume. The mass of the block is given as 5 kg. To convert this to grams, we can use the conversion factor 1 kg = 1000 g. So, the mass in grams is:

5 kg × 1000 g/kg = 5000 g

Using the volume calculated in part 2, we can find the density in g/cm³:

density = 5000 g/8000 cm³

density = 0.625 g/cm³

To convert g/cm³ to lb/in³, we can use the conversion factor 1 g/cm³ = 0.0361 lb/in³. So, the density in lb/in³ is:

0.625 g/cm³ × 0.0361 lb/in³/g/cm³ = 0.0226 lb/in³

4. The pressure on the wooden block is given by the formula: pressure = force/area. To find the pressure, we need to know the force acting on the block. Since the block is simply resting on the tabletop, the force acting on it is due to its weight. Using the formula for weight: w = mg, where w is weight, m is mass, and g is the acceleration due to gravity (9.8 m/s²).

To find the weight in newtons (N), we can use the conversion factor 1 kg = 9.8 N. So, the weight of the block is:

5 kg × 9.8 N/kg = 49 N

Using the area of the block's base (40 cm × 20 cm = 800 cm²), we can find the pressure in N/cm²:

pressure = 49 N/800 cm²

pressure = 0.06125 N/cm²

To convert N/cm² to psi, we can use the conversion factor 1 psi = 6894.76 N/m². So, the pressure in psi is:

0.06125 N/cm² × (1 m²/10,000 cm²) × (1 psi/6894.76 N/m²) = 0.0089 psi (rounded to four decimal places)

5. The pressure on the top surface of the wooden block is the same as the pressure calculated in part 4: 0.06125 N/cm² or 0.0089 psi.

6. To find the pressure on the bottom surface of the block, we can use the formula: pressure = force/area. Since the bottom surface has the same area as the top surface, the pressure will also be the same: 0.06125 N/cm² or 0.0089 psi.

7. The force acting on the top surface of the wooden block is simply its weight, which we calculated to be 49 N in part 4.

8. The force acting on the bottom surface of the wooden block is also its weight, which we calculated to be 49 N in part 4.

9. The force on the bottom surface is equal in magnitude to the force on the top surface.

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Answer:

-standard 1 kg : Kilogram (kg), basic unit of mass in the metric system.

-standard 1 meter: The standard metre is the length of the path travelled by light in vaccum during a time interval of 1/299792458 of a second.

- standard 1 second : The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time.

Explanation:

HOPE IT HELPS YOU !!

The fraction of the volume of the board below the surface of the water is 0.35. Option A is correct.

To determine the fraction of the volume of the board below the surface of the water, we can compare the densities of the board and the water.

The board has a density of 350 kg/m³, and the water has a density of 1000 kg/m³.

When an object floats in a fluid, it displaces an amount of fluid equal to its own weight. For the board to float, the weight of the water displaced by the submerged portion of the board must be equal to the weight of the board itself.

Let's calculate the weight of the board first;

Weight of the board = Volume of the board × Density of the board

The volume of the board is calculated by multiplying its dimensions:

Volume of the board = Length × Width × Thickness

Given;

Length = 3.00 m

Width = 20.0 cm = 0.20 m

Thickness = 5.00 cm = 0.05 m

Density of the board = 350 kg/m³

Volume of the board = 3.00 m × 0.20 m × 0.05 m = 0.03 m³

Weight of the board = 0.03 m³ × 350 kg/m³ = 10.5 kg

To find the fraction of the volume below the surface of the water, we need to determine the volume of water displaced by the submerged portion of the board. This volume can be calculated using Archimedes' principle:

Volume of water displaced = Weight of the board / Density of water

Given;

Density of water = 1000 kg/m³

Volume of water displaced = 10.5 kg / 1000 kg/m³ = 0.0105 m³

Finally, the fraction of the volume of the board below the surface of the water can be calculated as;

Fraction = Volume of water displaced / Volume of the board

Fraction = 0.0105 m³ / 0.03 m³ = 0.35

Therefore, the fraction of the volume of the board below the surface of the water is 0.35.

Hence, A. is the correct option.

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In summary, the frequency of the electron's motion, when treated classically as a point object moving around the nucleus, is directly proportional to the angular frequency.

As a point object moving around the nucleus, the electron's motion can be described by circular orbits. The frequency of the electron's motion can be calculated using the concept of angular frequency.

The angular frequency, denoted by ω, is defined as the rate at which the electron rotates around the nucleus. It is equal to the change in angle per unit time. Since the electron's motion is circular, the change in angle is given by 2π, which represents a complete revolution around the nucleus.

To calculate the frequency, we need to relate the angular frequency to the time period of the motion. The time period, denoted by T, represents the time it takes for the electron to complete one revolution around the nucleus.

The frequency, denoted by f, is the reciprocal of the time period, given by f = 1/T. Substituting T = 2π/ω into this equation, we can express the frequency in terms of the angular frequency as:

f = ω/2π.

Therefore, the frequency of the electron's motion is directly proportional to the angular frequency.

It's important to note that in classical mechanics, the electron's motion is described by the Bohr model, which has been superseded by quantum mechanics. In reality, the electron's motion is better understood using wave-particle duality and quantum concepts.

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Answer:

2400 m

Explanation:

Dimensions in units need to match so

 2 min = 120 sec

then rate X time = distance

       20 m/s  X 120 s  = 2400 m

Answer:

Explanation:

it is 43km

N = sqrt((4581 J) * (4π × 10^(-7) Tm/A) / ((0.741 m) * (0.0053 m²) * ((4π × 10^(-7) Tm/A) * (4.596 A))²))

N ≈ 710.92 turns/m

Thus, the solenoid has approximately 710.92 turns per unit length.

How many turns per unit length does the solenoid have?

To find the number of turns per unit length of the cylindrical solenoid, we can use the formula for the stored energy in a solenoid, which is:

U = (1/2) * L * N² * A * B² / μ₀

where:
U = stored energy (4581 J)
L = length of the solenoid (0.741 m)
N = number of turns per unit length
A = cross-sectional area of the solenoid (π * r², with r = 0.041 m)
B = magnetic field inside the solenoid (B = μ₀ * N * i)
μ₀ = permeability of free space (4π × 10^(-7) Tm/A)
i = current in the solenoid (4.596 A)

First, let's calculate the cross-sectional area A:
A = π * r² = π * (0.041 m)² ≈ 0.0053 m²

Now, we can rewrite the energy formula as:
U = (1/2) * L * N² * A * (μ₀ * N * i)² / μ₀

Solving for N, we get:
N = sqrt(U * μ₀ / (L * A * (μ₀ * i)²))

Plugging in the values, we have:
N = sqrt((4581 J) * (4π × 10^(-7) Tm/A) / ((0.741 m) * (0.0053 m²) * ((4π × 10^(-7) Tm/A) * (4.596 A))²))
N ≈ 710.92 turns/m

Thus, the solenoid has approximately 710.92 turns per unit length.

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Answer:

C is corret answer okay

Answer:

Jo

Explanation:

irradiating food doesn't make it radioactive (that's contamination) and beta particles are stopped by aluminium foil or thin metals, so it may not pass through thick packaging (usually gamma is used to irradiate foods as it can pass through the packaging)

Answer:

i think its 1.5 m/s to the right?

Explanation:

The final temperature of the steam in the tank is 685.869°C , in oc, and the final mass of the steam in the tank is 2.274 kg.

Applying mass balance

m+m1 = m2

0+m, = m.

mi = m2

By applying energy equation m1u1+mihi = m2u2,

0+m/h = mu2

hi = u2

At p1 = 40 bar and T = 500°C from superheated water tables hi=3445.3kJ/kg

Therefore

hi = ui =3445.3kJ/kg

At p2 = 20bar and u2 = 3445.3 kJ/kg from superheated water tables

T2 = 640 + (700-640)(3470.9-3362.2 / 3445.3-3362.2)

T2 = 685.869°C

v2=0.2091 (0.2232 -0.2091)(3445.3-3362.2 / 3470.9-3362.2)

v2=0.2198 m3/kg

Final mass

m2=V / v2

= 0.5 / 0.2198

m2 = 2.274 kg

Temperature is a measure of the degree of hotness or coldness of an object or a substance. It is a fundamental physical quantity and is commonly measured using a thermometer. The temperature of an object or substance is determined by the average kinetic energy of its molecules.

In the Celsius temperature scale, the freezing point of water is defined as 0 degrees Celsius (°C), while its boiling point is defined as 100°C at standard atmospheric pressure. In the Fahrenheit temperature scale, the freezing point of water is defined as 32 degrees Fahrenheit (°F), and its boiling point is defined as 212°F at standard atmospheric pressure. Temperature is an important parameter in many fields of science, including physics, chemistry, and biology. It affects the behavior of matter, the rate of chemical reactions, and the growth and survival of living organisms.

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Complete Question: -

An insulated, rigid tank whose volume is 0.5 m^3 is connected by a valve to a large vessel holding steam at 40 bar, 500 C. the tank is initially evacuated, the value is opened only as long as required to fill the tank with steam to a pressure of 20 bar. determine the final temperature of the steam in the tank, in C, and the final mass of the steeam in the tank, in Kg.

Answer:

B. Tomatos reflect red light

Explanation:

The only reason colors exist is because the objects with color reflect all other light except for what they are portrayed as. White reflects all colors, and black absorbs all colors.

If you have any questions feel free to ask :)

Answer:

Explanation: the pigment atoms in the skin absorb photons of all energies except those that correspond to red wavelengths of light, which they reflect back to your eye.

B is more likely the answer

The brightest star in the constellation Lyra is Vega. Vega is a bluish-white main-sequence star located approximately 25 light-years away from Earth.

It is one of the most prominent stars in the northern sky and is easily recognizable due to its brightness.

Vega is considered one of the three stars that form the Summer Triangle, along with Altair in Aquila and Deneb in Cygnus. These stars are visible during the summer months in the Northern Hemisphere and are used as prominent markers in the night sky.

Vega is also of significant astronomical importance as it served as the reference star for the calibration of the magnitude scale. Its spectral type and luminosity have been used as a standard for comparison with other stars.

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Identification of compounds can benefit from density. It is also a useful feature since it connects (or acts as a conversion factor between) a substance's mass and volume. Volume and mass are extended (or extrinsic) qualities of matter that are quantity dependent.

The force of an air mass acting on the earth's surface is known as atmospheric pressure. Remember that wind currents are created when the densities of two separate air masses differ.

Our wind currents are driven by the atmospheric pressure density, and denser air exerts a higher pressure than less dense air. Compared to the cold and dry air, the warm and humid air is less dense. The less dense air will then float on top of the thicker air in certain regions.

Therefore, Warm air masses rise while cold air masses descend because they are less dense.

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The maximum angle above the horizontal with which a projectile can be thrown can be found by considering the concept of range. The range of a projectile is the maximum horizontal distance it can cover before returning to the ground.

The range is maximum when the projectile is thrown at an angle of 45 degrees above the horizontal.

So, the maximum angle above the horizontal with which a projectile can be thrown is 45 degrees. It is worth noting that air resistance can affect the trajectory and the range of a projectile, but as per the problem statement, air resistance has been ignored.

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Answer: B

Explanation:

Hopes this helps!!

Answer:

B

Explanation:

Answer:

Those who survived the bomb may become deaf or blind, as well as suffer catastrophic burns and injuries. Even people who were not seriously injured could become trapped within a structure or unable to navigate through the wreckage.

Explanation: