Which statement is true?
Models are always the same size as what they represent.
Models are always made of the same materials as what they represent.
Models look exactly like what they represent.
Models make it easier to study an object, system, or process.

The resistance of a circuit that contains two 50.0 Ω resistors connected in series with a 12.0 V battery is 100 Ω. The resistance of the circuit is equal to the sum of the individual resistors when they are connected in series.

In this case, two 50.0 Ω resistors are connected in series, resulting in a total resistance of 100 Ω. Resistance can be defined as the obstruction that electricity faces when it travels through a conductor. The greater the resistance, the less current is allowed to flow through the circuit. The following equation is used to calculate resistance: R = V / IWhere R is resistance, V is voltage, and I is current.

Resistance can also be calculated using Ohm's Law if we know the values of voltage and current. When resistors are connected in series, the total resistance of the circuit is equal to the sum of the individual resistors. This is expressed by the following equation:RT = R1 + R2 + ... + RNWhere RT is the total resistance of the circuit, and R1, R2, and RN are the individual resistors. In this case, the circuit contains two 50.0 Ω resistors connected in series.

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Answer:

42000N

Explanation:

.........................

Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

The first-order maximum occurs at an angle of 11.0°

To find the angle at which the first-order maximum occurs, we can use the equation:

sinθ = mλ/d

where θ is the angle of diffraction, m is the order of the maximum (in this case, m = 1 for the first order), λ is the wavelength of light, and d is the distance between adjacent lines on the grating.

First, we need to find the wavelength of light with a frequency of 4.76 × \(10^{14}\) Hz. We can use the equation:

c = λf

where c is the speed of light (3.00 × \(10^{8}\) m/s) and f is the frequency of light. Rearranging this equation, we get:

λ = c/f

Plugging in the values, we get:

λ = 3.00 × \(10^8\) m/s / 4.76 × \(10^{14}\) Hz
λ ≈ 6.30 × \(10^{-7}\) m

Next, we need to find the distance between adjacent lines on the grating. Since the grating has 300 lines per mm, there are 300 x 10^3 lines per meter. Thus, the distance between adjacent lines is:

d = 1 / (300 x \(10^3\)) m
d = 3.33 × \(10^{-6}\) m

Now we can plug in these values to find the angle of diffraction:

sinθ = (1)(6.30 × \(10^{-7}\) m) / (3.33 × \(10^{-6}\) m)
sinθ ≈ 0.189
θ ≈ 11.0°

Therefore, the first-order maximum occurs at an angle of approximately 11.0°.

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Insulating the cable with rubber having a thermal conductivity of 0.15 W/m degree increases the heat flow from the cable to 63.80 W per meter length compared to a non-insulated cable in an atmosphere with a temperature difference of 50 degrees Celsius. The correct option is C.

To determine how the heat flow from the cable is affected by insulation, we need to calculate the heat transfer rate for both the insulated and non-insulated cases. The heat transfer rate can be determined using the formula:

Q = (T2 - T1) / (R_total)

Where:

Q is the heat transfer rate per unit length (W/m),

T2 is the surface temperature of the cable (75 degrees Celsius),

T1 is the ambient temperature (25 degrees Celsius),

R_total is the total thermal resistance.

For the non-insulated case:

R_total = R_convection

For the insulated case:

R_total = R_convection + R_insulation

Let's calculate the heat transfer rate for both cases:

Non-insulated case:

R_convection = 1 / (h * A)

A = 2 * π * r * L (surface area of the cable)

Q_non-insulated = (T₂ - T₁) / (R_convection)

Insulated case:

R_insulation = d / (k * A)

Q_insulated = (T₂ - T₁) / (R_convection + R_insulation)

Given the information:

h = 12.5 W/m² degree

k = 0.15 W/m degree

d = 10 mm = 0.01 m

T₂ = 75 degrees Celsius

T₁ = 25 degrees Celsius

By comparing the heat transfer rates for the non-insulated and insulated cases, we can determine the effect of insulation on the heat flow from the cable.

Therefore, by Calculating the values and comparing the heat transfer rates, we find that the correct option is c) 63.80 W per meter length.

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The critical angle of the transparent material is 35.3 degrees.

The critical angle is the angle of incidence at which the angle of refraction is 90 degrees. In this case, the angle of refraction is 32 degrees. Therefore, the critical angle is calculated as follows:

sin(critical angle) = sin(90 degrees) / sin(angle of refraction)

sin(critical angle) = 1 / sin(32 degrees)

sin(critical angle) = 0.574

critical angle = arcsin(0.574)

critical angle = 35.3 degrees

Therefore, the critical angle of the transparent material is 35.3 degrees.

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At position (3, 9), where the tangent line passes through, Han Solo should turn off the engines (4, 15).

The first three things need to be completed, or at least started, right away: Fly the aircraft as you instantly apply full carb heat and check the gasoline in both or one of the tanks, hit the fuel boost or pump, and mix the fuel to full richness.

Finding the tangent line to the curve y = x2 at that location will help us determine when Han Solo should turn off the engines.

The derivative of the function determines the slope of the tangent line at any point on the curve y = x2.: dy/dx = 2x

Han Solo should turn off the engines at position (x1, y1). Next, we have

y1 = x1^2 (since the point is on the curve y = x^2)

dy/dx = 2x1 (since this is the slope of the tangent line at (x1, y1))

The equation of the tangent line via (4, 15) can be expressed using the point-slope form of a line as follows:

y - y1 = m(x - x1)

Substituting y1 = x1^2 and m = 2x1, we get:

y - x1^2 = 2x1(x - x1)

Now, we can substitute the coordinates of the point (4, 15) to solve for x1:

15 - x1^2 = 2x1(4 - x1)

15 - x1^2 = 8x1 - 2x1^2

x1^2 - 8x1 + 15 = 0

This quadratic equation can be factored as:

(x1 - 3)(x1 - 5) = 0

Therefore, the possible values of x1 are 3 and 5.

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Answer:

.

Explanation:

Explanation:

Given parameters:

Number of cycles  = 10cycles

Time taken  = 50s

Unknown:

Period of its rotation  = ?

Frequency of its rotation  = ?

Solution:

The period of rotation is the time taken time taken for a body to complete a number of rotation;

 Period  = \(\frac{t}{n}\)  

t is the time

n is the number of cycles

 Period  = \(\frac{50}{10}\)  = 5s

The period is 5s

Now, frequency is the inverse of period;

   F = \(\frac{1}{period}\)  = \(\frac{1}{5}\)   = 0.2Hz

Electricity is defined as the flow of electrical current through a conductor.

A fundamental type of energy that is produced by the presence and movement of electric charge is electricity. The passage of electrons or other charged particles across a conductor, like a wire, is what defines the phenomena. It includes the creation, transmission, and use of electric energy, as well as the full field of electric phenomena.

Therefore,

Electricity is defined as the flow of electrical current through a conductor.

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Students are going to conduct an experiment to study the effect of a net force applied to an object on the object’s motion. In each trial of the experiment, the students will apply a net force on the object. They also need to take two other measurements. The other quantities they should measure in each trial of the experiment will be mass and acceleration

As we know that Force depend upon mass as well as acceleration , hence it is important to take measurements of mass and acceleration . Since ,

according to newton's third law

F = ma

where

m = mass

a = acceleration

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When a dielectric material is inserted between the plates of a charged capacitor, the free charge on the surface of the plates will remain unchanged, while the total charge (free and bound) on the surface of the plates will decrease.

A dielectric material is an insulating material that can store electrical energy in an electric field. In other words, it is a material that has a high resistance to the flow of electric current and does not conduct electricity.

Dielectric materials are commonly used as insulators in capacitors, which are electronic components that store electrical energy in an electric field. When a dielectric material is placed between the plates of a capacitor, it increases the capacitance of the capacitor, allowing it to store more electrical energy.

Examples of dielectric materials include air, glass, ceramics, and certain plastics. The properties of a dielectric material, such as its dielectric constant, determine how effective it is at storing electrical energy in an electric field.

Overall, dielectric materials play an important role in many electrical and electronic devices, including capacitors, transformers, and other components that use electric fields to store and transfer electrical energy.

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When the slits are illuminated with coherent light with a wavelength of 500 nm, the distance between the second and third dark lines of the interference pattern on the screen is approximately 0.83 mm.

The distance between the second and third dark lines of the interference pattern can be calculated using the formula for dark lines in a double-slit interference experiment:

y = (m+1/2) * (λL/d), where y is the distance from the central maximum to the m-th dark line, λ is the wavelength of the light, L is the distance between the slits and the screen, and d is the distance between the two slits.

For the second dark line (m=1):
y₂ = (1+1/2) * (500 nm * 75.0 cm / 0.450 mm)
y₂ = (3/2) * (500 * 10⁻⁹ m * 0.75 m / 4.50 * 10⁻⁴ m)

For the third dark line (m=2):
y₃ = (2+1/2) * (500 nm * 75.0 cm / 0.450 mm)
y₃ = (5/2) * (500 * 10⁻⁹ m * 0.75 m / 4.50 * 10⁻⁴ m)

Now, find the distance between the second and third dark lines:
Distance = y₃ - y₂
Distance = [(5/2) - (3/2)] * (500 * 10⁻⁹ m * 0.75 m / 4.50 * 10⁻⁴ m)
Distance = (1) * (500 * 10⁻⁹ m * 0.75 m / 4.50 * 10⁻⁴ m)
Distance ≈ 0.8333 mm

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b. upthrust. The upward force exerted by a gas or liquid is called upthrust.

This force is generated due to the content loaded and the pressure exerted by the gas or liquid. A fluid's buoyancy, also known as upthrust, opposes the weight of an item that is partially or completely submerged by exerting an upward push. The weight of the fluid on top causes pressure in a fluid column to rise with depth. As a result, the pressure at the bottom of a fluid column is higher than at the top. Similar to this, an object submerged in a fluid experiences greater pressure at its bottom than it does at its top. A net upward force is exerted on the item as a result of the pressure differential.

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The agriculture land needed to grow the willow is 1500000 Hectares

Power can be defined as the rate at which work is done by an object. The S.I unit of power is Watt(W).

A coal burning power station burns 6 million tonnes of coal per kg. Coal has a average energy value of 29.25 MJ per year. Wood chip from willow trees has an energy value of 13 MJ per kg. A hectare of agricultural land can produce 9 tonnes of drt willow wood per year.

The coal consumption per year = 29.25 x 1000 x 6000000

                                                    =175500000000 MJ

If this power station burned dry willow wood instead of coal, agriculture land would be needed to grow the willow,

1 hectare of willow will produce 9 x 13x 1000 = 117000 MJ.

The agriculture land needed to grow the willow is

= 175500000000 MJ /  117000 MJ.

= 1500000 Hectares.

Thus, agriculture land needed is  1500000 Hectares.

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The Third Law of Thermodynamics states that as the temperature of a system approaches absolute zero, the entropy of the system approaches a minimum value.

Entropy is a thermodynamic quantity that measures a system's degree of disorder or unpredictability. The higher the entropy of a system, the more disorganised or unpredictable it is. According to the Third Law of Thermodynamics, the entropy of a system at absolute zero is the lowest value that can be achieved.

The Third Law of Thermodynamics and entropy are intimately related since the Third Law limits a system's entropy. The Third Law states that as a system approaches absolute zero, its entropy approaches a minimum value, which is specified by the Third Law.

The Third Law also suggests that reaching absolute zero temperature is unachievable, and so the minimal entropy is an unattainable goal.

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Answer:

The Bt gene is inserted into one plant cell by using a bacterial plasmid.

Explanation:

Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.

The helium balloon rises because it is lighter than the same amount of air at ambient temperature. It is heavier than the same volume of air at low temperatures because its volume is too small. Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.

If the temperature remains constant and the pressure decreases, the volume will increase (balloon expands). If the pressure increases while T remains constant (let's say you're holding the balloon underwater), V will decrease (balloon shrinks). When the temperature rises and the volume remains constant (like in an aerosol can), P increases.

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1) Experiment to find the density of the wood block without using a weighing scale:

a) Fill the pyrex beaker with a known volume of water.

b) Measure and record the initial water level in the beaker.

c) Carefully lower the wood block into the water, ensuring it is fully submerged.

d) Measure and record the new water level in the beaker.

e) Calculate the volume of the wood block by subtracting the initial water level from the final water level.

f) Divide the mass of the wood block (obtained from the second experiment) by the volume calculated in step e to determine the density of the wood block.

2) Experiment to measure the density of the wood block using a weighing scale:

a) Weigh the wood block using a weighing scale and record its mass.

b) Fill the pyrex beaker with a known volume of water.

c) Measure and record the initial water level in the beaker.

d) Carefully lower the wood block into the water, ensuring it is fully submerged.

e) Measure and record the new water level in the beaker.

f) Calculate the volume of the wood block by subtracting the initial water level from the final water level.

g) Divide the mass of the wood block by the volume calculated in step f to determine the density of the wood block.

Comparing the results from both experiments will provide insights into the porosity of the wood block. If the density calculated in the first experiment is lower than in the second experiment, it suggests that the wood block is porous and some of the water has been absorbed.

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Explanation:

Hope this helps,

Juno entered a polar orbit of Jupiter on July 5th 2016 UTC, to begin a scientific investigation of the planet. After completing its mission, Juno will be intentionally deorbited into Jupiters atmosphere. Junos mission is to measure Jupiters composition, gravitational field, magnetic field, and polar magnetosphere.

Answer:

1

3

4

5

or

a

c

d

e

Explanation:

The space station's mass and the pull of its gravitational field on the planet(D)

Astronaut is a term for a person who has travelled to space that is derived from the Greek words for "star" and "sailor." More specifically, space travellers from the United States, Canada, Europe, and Japan are referred to as "astronauts" in the West. An astronaut is a person who has received specialised training in order to travel to space. A spaceship's astronauts may do a variety of tasks. Typically, a commander and a pilot collaborate to lead the mission. Other positions could be science pilot, mission expert, payload commander, and flight engineer.

The astronaut does highly significant scientific research on Earth to advance technological advancement in addition to gathering samples, performing tests, and making minor repairs on spaceships and space stations. The study of space and even all the efforts made to escape the gravity of Earth have led to the production of items that we use every day as well as scientific theories that have altered our perceptions of space and our understanding of the origins of life on Earth.

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Answer:

15.8 seconds

Explanation:

Create an extended calculation to convert all the unit to what you need.

160 km      1000 m       1 hour         1 min

----------- x ------------- x -------------- x ----------   =  44.4 m/s

1 hour            1 km         60 min      60 sec

So 160km/hr is equal to 44.4m/s

Now you can figure out how many seconds it will take to go 700 meters.

44.4 m          

----------   X     x sec   =  700 m

1  sec

Solve for x sec

x sec = 700m / 44.4 m/s

         =  15.8 seconds

The statement, "All meteorites collected on earth come from asteroids or comets " is: False.

Meteorites can come from various celestial bodies, including asteroids, comets, and even the Moon or Mars.

While a significant number of meteorites are believed to originate from asteroids, not all of them do.

Some meteorites, known as cometary meteorites or carbonaceous chondrites, are thought to come from comets. These meteorites contain organic compounds and water, suggesting their origin from cometary bodies.

In addition to asteroids and comets, meteorites can also be sourced from the Moon and Mars. Lunar meteorites are fragments of the Moon's surface that were ejected into space by impact events and eventually landed on Earth.

Martian meteorites, on the other hand, are pieces of Mars' surface that were dislodged by asteroid impacts and made their way to Earth.

Therefore, while a significant proportion of meteorites come from asteroids and comets, it is incorrect to say that all meteorites collected on Earth exclusively come from these sources.

Some meteorites can originate from the Moon, Mars, and possibly other celestial bodies as well.

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In order to be a vector quantity, the quantity needs to have a direction, besides its magnitude.

For example, temperature has no direction, only magnitude, but velocity has direction and magnitude.

From these options, the only one that is a vector quantity is displacement, therefore the correct option is A.

Answer:

This is valid information......

Answer:

???

Explanation:

thanks for the points?

The gravitational force between the two bricks is approximately 1.33686 × 10⁻⁷ N (Newton). The bricks do not move toward each other significantly because the gravitational force between them is relatively weak compared to other forces at play.

To calculate the gravitational attraction between two objects, we can use Newton's law of universal gravitation, which states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers of mass.

In this case, the mass of each brick is 80 kg, and the distance between their centers of mass is 4 m. We can calculate the gravitational force using the formula:

F = G * (m1 * m2) / r²

Where:

F is the gravitational force

G is the gravitational constant (approximately 6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²

m1 and m2 are the masses of the bricks (80 kg in this case)

r is the distance between their centers of mass (4 m in this case)

Plugging in the values, we get:

F = (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻² * (80 kg * 80 kg) / (4 m)²

Calculating this, we find that the gravitational force between the two bricks is approximately 1.33686 × 10⁻⁷ N (Newton).

Although there is a gravitational force between the two bricks, its magnitude is extremely small compared to other forces acting on the bricks, such as the electromagnetic forces between the atoms and molecules that make up the bricks, and the normal force exerted by the surface on which the bricks are placed.

In everyday situations, these other forces overpower the gravitational force, making it negligible. The gravitational force between two small objects like bricks is typically much weaker than the forces that hold the objects together or the forces present in the immediate environment.

Therefore, the bricks do not move toward each other significantly because the gravitational force between them is relatively weak compared to other forces at play.

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Answer: It’s 98,000

Explanation: Just did it on apex

The gravitational potential energy is the work done or energy transfered per unit mass which is required to move an object to that location from a fixed reference point.

Schematic diagram:

The gravitational potential energy of the pendulum bob having mass m relative to its center position is given as,

Here, m is the mass of the bob pendulum, g is the acceleration due to gravity, and h is the height from surface.

Therefore, the gravitational potential energy of the pendulum bob relative to its normal center position when it is first released is mgh.

If two equipotential planes differ in potential by 1.0 volt, and the electric field between them is 20 n/c, the separation between the two equipotential planes is 0.05 m.

The separation between the two equipotential planes can be found by using the equation E = V/d, where E is the electric field, V is the potential difference, and d is the separation between the planes. In this problem, E = 20 n/c, V = 1.0 V, so d = V/E = 1.0 V/20 n/c = 0.05 m. This means that the separation between the two equipotential planes is 0.05 m.

Here, correct answer will be

The electric field between two equipotential planes is always constant, since the potential difference between them is constant. Since the electric field is determined by the potential difference between the two planes, the separation between them is dependent on the potential difference and the electric field. By using the equation E = V/d, we can calculate the separation between the equipotential planes.

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Answer:

Nonliving things are composed of pure substances, living things are made of more complex units.

Explanation:

Is this what you are asking?

Answer:

cuz he use parachute

Explanation:

free fall is when you are falling and accelerating with G, so as parachuist using parachute and decelerating it's not free fall.