What is a force that opposes motion through direct contact?

Answer:

The circumference of planet tirth is \(C = 90000 \ km\)

Explanation:

From the question we are told that

   The distance of tyene from the observer is  \(d = 750 \ km\)

   The altitude of the sun from the equinox is   \(\theta_s = 87.0^o\)

Generally given that on the equinox your sun is directly overhead in the city of tyene , then the altitude of the tyene from the equinox is  \(\theta_e = 90 ^o\)

Generally the angular distance between tyene and the sun as observed from the equinox is mathematically represented as

         \(\theta _d = \theta_e - \theta_s\)

=>       \(\theta _d = 90 -87\)

=>       \(\theta _d =3^o\)

Generally the ratio of \(\theta _d =3^o\) to  \(360^o\) which is the total angle in a circle is equal to the ratio of  \(d = 750 \ km\) to the circumference of the planet

So

         \(\frac{\theta_d}{360} = \frac{750}{C}\)

=>      \(\frac{3}{360} = \frac{750}{C}\)

=>     \(C = 90000 \ km\)

The mutual inductance (M) in a two-coil system depends on the number of turns in each coil (N₁ and N₂), the permeability of the medium between the coils (µ), and the geometry of the coils.

Mutual inductance is a measure of the ability of one coil to induce an electromotive force (emf) in the other coil when a current changes in one of them. It depends on several factors.

First, the number of turns in each coil plays a role. The greater the number of turns, the stronger the magnetic field produced by the coil, resulting in a higher mutual inductance.

Second, the permeability of the medium between the coils is important. The permeability determines how easily magnetic flux lines pass through the medium. A higher permeability leads to stronger coupling between the coils and, consequently, higher mutual inductance.

Lastly, the physical arrangement and geometry of the coils affect the mutual inductance. The proximity and alignment of the coils influence the amount of magnetic flux linking them, thereby impacting the mutual inductance.

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The speed of a train that moves from a train station at 30 meters per second after 5 seconds and covers a distance of 100 m with an acceleration of ten meters per second square would be 80 m/s.

We can use the equation of motion to solve for the final velocity of the train:

v = u + at

where:

Substituting the values, we get:

v = 30 + 10(5)

v = 80 m/s

Therefore, the speed of the train after 5 seconds is 80 m/s.

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Answer:

Water

Explanation:

A dilution is a solution made by adding more solvent to a more concentrated solution (stock solution), which reduces the concentration of the solute. An example of a dilute solution is tap water, which is mostly water (solvent), with a small amount of dissolved minerals and gasses (solutes).

~Hope this helps

Answer: Transverse waves

Explanation:

Transverse waves cause the medium to move perpendicular to the direction of the wave. Longitudinal waves cause the medium to move parallel to the direction of the wave.

Answer:

camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

Answer: camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

These variables would cause investment funds to flow from Japan to the United States.

The higher interest rate in the United States (12 percent) compared to Japan (5 percent) makes investing in US government securities more attractive. Investors seeking higher returns would be inclined to move their funds from Japan, where the interest rate is lower, to the United States, where they can earn a higher interest rate on their investments.

Additionally, the higher inflation rate in the United States (8 percent) compared to Japan would further encourage the flow of investment funds from Japan to the United States. Inflation erodes the purchasing power of money, and investors prefer to invest in countries with lower inflation rates to preserve the value of their investments. With a lower inflation rate, the United States appears relatively more stable and attractive for investment compared to Japan.

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The option with the smallest mass is e. 0.020 kg of Br2.Option E

To determine which option has the smallest mass, we need to compare the masses of each given quantity.

a. 10.0 mol of F2:

To find the mass, we can use the molar mass of F2, which is 38.0 g/mol. Therefore, the mass of 10.0 mol of F2 is:

10.0 mol * 38.0 g/mol = 380 g

b. 5.50 x 10^24 atoms of 12O:

To find the mass, we need to know the molar mass of 12O. However, the given molar mass is for F2, not for 12O. Therefore, we cannot determine the mass of this option.

c. 3.50 x 10^24 molecules of 12O:

Similarly, without the molar mass of 12O, we cannot determine the mass of this option.

d. 255 g of Cl2:

Since the molar mass of Cl2 is 70.9 g/mol, the number of moles in 255 g can be calculated as:

255 g / 70.9 g/mol = 3.59 mol

e. 0.020 kg of Br2:

The molar mass of Br2 is 159.8 g/mol. To convert 0.020 kg to grams, we multiply by 1000:

0.020 kg * 1000 g/kg = 20 g

Now we can determine the number of moles:

20 g / 159.8 g/mol ≈ 0.125 mol

Comparing the number of moles, we find that option d (255 g of Cl2) has the largest number of moles, indicating a larger mass compared to the other options. Among the remaining options, option e (0.020 kg of Br2) has the smallest mass. Option e

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Swimmer C gets across first. The reasoning behind the three swimmers crossing the river is different. Swimmer A swims directly across the river. Swimmer B swims upstream at an angle that allows him to be carried downstream by the current and reach the other side directly across from his starting point.

Swimmer C swims downstream at an angle that allows him to be carried downstream by the current, therefore, making the current work for him. Therefore, Swimmer C gets across first because he is swimming at the highest speed due to the help of the current. Swimmer B will take longer than he expects because some of his efforts will be spent battling the current. Swimmer A will cover the longest distance and will take longer than both Swimmer B and Swimmer C. Hence, Swimmer C is the one who gets across first.

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Using the visual spectrum, we can distinguish between various light wavelengths.

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An infrared thermometer does not have to touch the surface of food to check the temperature accurately.

Infrared thermometers, can be called laser thermometers, work by measuring the infrared radiation emitted by an object.

Since they don't need to make direct contact with the food, they can provide a temperature reading without potentially contaminating the food.

Whilee Infrared thermometers are often used to measure the temperature of food, but they can also be used to measure the temperature of other objects, such as people, animals, and the environment.

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When a given molecule absorbs a photon of microwave radiation, its rotational energy state changes.

The absorption of a microwave photon by a molecule causes a change in its rotational energy state. The rotation of a molecule occurs about its center of mass, which is referred to as its rotational energy. When a molecule absorbs microwave radiation, it acquires energy that causes it to transition to a higher rotational energy state.

The absorption of a microwave photon results in an increase in the energy of the molecule, which causes it to spin faster around its axis. In order to make this change, the molecule must first absorb the radiation's energy.

As a result, microwave radiation is often used to investigate molecular structures because it can induce transitions between different rotational energy levels of a molecule.

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"The clock on the big ben tower in London reads 12 noon. If you travel away from the clock at a very high speed and view it with a telescope, you would see it run slower than a clock in your vehicle" (Option A) This phenomenon is known as Time Dilation.

Time dilation is defined in physics and relativity as the difference in elapsed time as measured by two clocks. It is either owing to a difference in relative velocity or a difference in gravitational potential between their places.

When left undefined, "time dilation" generally refers to the impact of velocity.

Time dilation is the "slowing down" of a clock as determined by an observer in relative motion with regard to that clock under the theory of special relativity.

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Full Question:

Suppose you look at the huge clock on the Big Ben Tower in London and it reads 12 noon. If you could travel away from the clock at the speed of light and view it with a telescope, it would:

a) run slower than usual

b) run faster than usual

c) be frozen at 12 noon

The transportation technology constructed and planned for exporting oil and natural gas from Central Asia is pipelines.

The region is rich in oil and natural gas reserves, and its energy resources are in high demand by countries around the world. Several pipelines have already been constructed, including the Caspian Pipeline Consortium pipeline, which transports crude oil from the Caspian Sea to the Russian Black Sea port of Novorossiysk, and the Central Asia-China pipeline, which transports natural gas from Turkmenistan to China. Additionally, there are plans for several other pipelines, such as the Turkmenistan-Afghanistan-Pakistan-India (TAPI) pipeline and the Trans-Caspian Gas Pipeline, which would further expand the transportation of energy resources from Central Asia to other parts of the world.

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Answer:

Explanation:

The work done by an object can be found by using the formula

From the question

force = 1,000 N

distance = 20 m

We have

workdone = 1000 × 20

We have the final answer as

Hope this helps you

Based on what I know about visible wavelength observations in the interstellar medium, the correct statements from the list are:
- Dark nebulae block out starlight.
- Reflection nebulae shine for reasons similar to those that make our sky blue.
- Most interstellar gas and dust is concentrated in the plane of our Milky Way Galaxy.

To explain further:
1. Dark nebulae block out starlight because they consist of dense clouds of gas and dust that absorb and scatter the light from background stars.
2. Reflection nebulae shine due to the scattering of light from nearby stars, which is similar to how our sky appears blue due to the scattering of sunlight by Earth's atmosphere.
3. Most interstellar gas and dust is concentrated in the plane of our Milky Way Galaxy, as they are predominantly found in the disk of the galaxy where star formation occurs.

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The electric flux through the cylinder depends on the charge enclosed by it. If the cylinder is concentric with two charged objects, we need to know their charges and positions relative to the cylinder to calculate the flux.

However, we can explain how to calculate the electric flux in general terms. Electric flux is defined as the electric field passing through a surface, and it depends on the electric field and the area of the surface. In this case, the surface is the lateral surface of the cylinder. To calculate the electric flux, we need to first find the electric field at every point on the cylinder's surface. This can be done by applying Coulomb's law or using Gauss's law. Once we have the electric field, we can calculate the electric flux by multiplying it by the area of the surface. If the cylinder encloses a charge, the total electric flux through the cylinder will be proportional to the charge enclosed. If the cylinder does not enclose a charge, the electric flux will be zero.

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Answer:  20 m/s

Explanation:

P = mv

since we're trying to find the velocity, you change the formula to v = P/m

v = ?

P = 9 kgm/s

m = 0.45 kg

v = 9 kgm/s / 0.45kg  = 20 m/s

It will take about 12.12 minutes for the thermocouple to read 95% of the initial temperature difference of the sphere. This is due to difference in temperature.

What is the time required to read 95% of initial temperature difference?

In order to determine how long it will take for the thermocouple to read 95% of the initial temperature difference, the following formula is used:

t = (rho × V × Cp)/(h × pi × D) × ln ((Tinitial - T∞) / (Tinitial - Tcutoff))

where, t = time (s), ρ = density (kg/m³), V = volume (m³), Cp = specific heat capacity (J/kg °C), h = heat transfer coefficient (W/m²°C), D = diameter (m), Tinitial = initial temperature (°C), T∞ = surrounding temperature (°C), Tcutoff = temperature at which the thermocouple reading is 95% of the initial temperature difference (°C).

Substituting the given values into the above formula:

t = (8500 kg/m³ × (4/3 × pi × (0.0006 m)³)) / (65 W/m2 °C × pi × 0.0012 m) × ln ((100 °C - 25 °C) / (100 °C - 95 °C))

t = 727.31 s or 12.12 minutes.

Therefore, it will take approximately 12.12 minutes for the thermocouple to read 95% of the initial temperature difference.

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n terms of the Beer-Lambert law, which states that the intensity of light (I) is proportional to the amount of light-absorbing material (A) and the distance it travels through the material (d), according to the equation:

I = I0 e^(-αd)

where I0 is the initial intensity of the light, α is the absorption coefficient of the material, and e is the base of the natural logarithm.

In pulse oximetry, a device called a pulse oximeter is placed on a patient's finger or earlobe. The pulse oximeter emits light of two different wavelengths (typically red and infrared) into the tissue, and then measures the amount of light that is transmitted through the tissue and reaches a detector on the other side.

The amount of light absorbed by the tissue depends on the concentration of oxygenated and deoxygenated hemoglobin in the blood. Oxygenated hemoglobin absorbs less light at the red wavelength and more light at the infrared wavelength, while deoxygenated hemoglobin absorbs more light at the red wavelength and less light at the infrared wavelength.

By measuring the difference in absorption between the two wavelengths, the pulse oximeter can calculate the oxygen saturation of the blood, which is the percentage of hemoglobin in the blood that is carrying oxygen.

The pulse oximeter uses the Beer-Lambert law to calculate the amount of light absorbed by the tissue at each wavelength, and then uses a mathematical algorithm to determine the oxygen saturation based on these measurements.

Overall, pulse oximetry is a non-invasive and relatively simple method for monitoring a patient's oxygen saturation in real-time, which is a critical parameter in many medical situations.

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This is the process of changing the shape of the eye lens to focus on near or distant objects.

The velocity of the target ball after the collision will be 1.32 / m².

Velocity of the target ball after the collision = (m1u1 + m2u2) / (m1 + m2)

Here, m1 = mass of the incoming softball = 0.220 kgm² = mass of the target ball = ?

u1 = initial velocity of the incoming softball = 4.0 m/su2 = initial velocity of the target ball = 0 m/sv1 = final velocity of the incoming softball = -2.0 m/s (because the incoming softball is bouncing backward)

v2 = final velocity of the target ball = ?

Substituting the given values in the above formula, we get:

v2 = (m1u1 + m2u2 - m1v1) / m2v2 = (0.220 x 4.0 + 0 x 0 - 0.220 x (-2.0)) / m2v2 = (0.880 + 0.440) / m2v2 = 1.32 / m²

Therefore, the velocity of the target ball after the collision is 1.32 / m².

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Answer:

the answer is B

Explanation:

we assume that all of these springs have tha same k , the spring constant

elastic energy for the initial system = Ep1=  \(\frac{kd^{2} }{2}\)

for the new changed system , the spring constant = k1+k2 = k+k = 2k  , but the displacement is also reduced to 0.5 d

so Ep2 = \(\frac{2k(0.5d)^{2} }{2} = \frac{kd^2}{4}\)

so the new total Ep stored in the new system is 1/2Ep

hope it helps

Answer:

R = -2500N

Explanation:

Use formula ΣF = Ma. We can split the Net Force into two parts: Fe - Ff  =  Ma.

Fe is the force developed by the engine: 4000N

Ff (R) is the air resistance projected on the vehicle. This is the value we're looking for.

Mass: 1000kg

Acceleration: 1.5m/s^2

Next, just plug in the values and solve.

▪4000N - Ff  =  (1000kg)(1.5m/s^2)

▪Ff = 1500N - 4000N

▪Ff = -2500N

R = -2500N.

The air resistance acting on the car is R = -2500N.

a) the acceleration of the car = -2.75 m/s

b) d = 198 meters. Therefore, the squirrel would survive.

c) the car moving at 100 meters with a speed of 23.22m/s

What is acceleration ?

acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Use the kinematic equation to solve for the acceleration:

v = u +at

v = final velocity

u = initial velocity

a = acceleration

t = time

In this instance, the final velocity is 0 because he comes to a stop. We can solve for the acceleration by plugging in the given values:

0 = 33 + (12)a

0 = 33 + 12a

-33 = 12a

-33 / 12 = a  --> a = -2.75 m/s²

b) Find the amount of distance necessary to stop. Use the formula:

v^2 = u^2 + 2ad

d = distance

Plug in the values:

0² = 33² + 2(-2.75 · d)

0 = 1089 - 5.5d

-1089 = -5.5d

d = 198 meters. Therefore, the squirrel would survive.

c)

Find the velocity at 100 meters by using the same formula as before:

v^2 = u^2 + 2ad

However, in this instance, we are solving for the final velocity. Plug in the given points to solve:

vf² = 33² + 2(-2.75 · 100)

vf² = 1089 + (-550)

vf² = 539

vf = √539

vf ≈ 23.22 m/s.

the car moving at 100 meters with a speed of 23.22m/s

a) the acceleration of the car = -2.75 m/s

b) d = 198 meters. Therefore, the squirrel would survive.

c) the car moving at 100 meters with a speed of 23.22m/s

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Answer:

Explanation:

initial velocity u = 54 km/h = 15 m/s

final velocity v = 18 km/h = 5 m/s

distance s = 10 m

1. v^2 = u^2 + 2as

5^2 = 15^2 + 2a × 10

25 = 225 + 20a

25 - 225 = 20a

20 a = -200

a = -200/2

a = -100m/s^2

∴Deacceleration = -100m/s^2

2. v = u + at

5 = 15 -100t

5-15 = -100t

-10 = -100t

t = 100 / 10

∴t = 10 sec

Total distance covered by the car 10 m

To me, the hardest part of this whole thing is keeping the units straight.  We're starting out with information given to us in kilometers, hours, and meters, and we have to come up with answers in m/s² , seconds, and meters.

When I worked this problem, I jumped right in without thinking, and I immediately got bogged down when I had to go off to the side and convert some units.

Now I know better.  THIS time, before we get all tangled up trying to solve anything, let's get clever and change everything to m/s right now !

(54 km/hour) · (1,000m/km) · (1 hour/3600 sec)  =  15 meters/second

(18 km/hour) · (1,000 m/km) · (1 hour/3600 sec) = 5 meters/second

NOW I'll betcha it's gonna be about 70% faster and easier !

i). Acceleration = (change in speed / time for the change)

We know the distance, but not the time.  I know there's a formula for it, but I've learned so many formulas during my lifetime that I can't remember ALL of them.  So I just memorize some of them, and I work things out from the formulas that I know.  Here's how I do time:)

Average speed during the given slow-down = (1/2)·(15+5) = 10 m/s

Distance covered during the given slow-down = 10 m.

Time = (distance) / (average speed) = (10m) / (10 m/s) = 1 second

Acceleration = (change in speed) / (time for the change)

Acceleration = (5 m/s - 15 m/s) / (1 second)

Acceleration = (-10 m/s) / (1 second)

Acceleration = -10 m/s²   (or 'Deceleration' = 10 m/s² )

_____________________________________________

For parts ii). and iii)., there's a big shift in the question.

It only gave you the slow-down from 54 to 18 km/hr for the purpose of calculating the deceleration.  NOW, for the rest of the answers, it's talking about a complete stop ... 0 m/s .

____________________________________________

ii). Time required to stop = (initial speed) / (deceleration)

Time to stop from 54 km/hr = (15 m/s) / (10 m/s²)

Time to stop = 1.5 seconds

iii).  Distance covered = (average speed) · (time to stop)

Distance covered = (7.5 m/s) · (1.5 sec)

Distance covered = 11.25 meters

OR ... use the official formula:

Distance = (1/2) · (acceleration) · (time² )

Distance = (1/2) · (10 m/s²) · (1.5 sec)²

Distance = 11.25 meters           yay !

According to the conservation of angular momentum, if an ice-skater starts spinning with her arms out wide, and then slowly pulls them close to her body, this will cause her to spin faster. The conservation of angular momentum states that the total angular momentum of a system remains constant as long as no external torque acts on it. This means that if a spinning object pulls its arms closer to its body, its rotational speed will increase.

This is because the moment of inertia of the system is reduced as the mass is brought closer to the axis of rotation. Since the angular momentum of the system must remain constant, an increase in rotational speed must occur to compensate for the decrease in moment of inertia. The principle of conservation of angular momentum can be observed in many physical systems, such as figure skating, where an ice skater spinning with her arms extended can increase her rotational speed by pulling her arms closer to her body. This is because the total angular momentum of the skater is conserved, and the decrease in moment of inertia is compensated by an increase in rotational speed.

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