SOMEONE PLEASE HELP WITH THIS QUESTION!!!!

Answer:

The refractive index of the outer coating is 1.52.

Explanation:

Refractive index of interior part, n' = 1.97

critical angle, C = 50.4°

Let the refractive index of the coating is n.

Use the Snell's law,  

\(n\times sin r = n'\times sinC\\\\n\times sin 90 = 1.97 \times sin 50.4\\\\n = 1.52\)

The soil loss in  \(Mg ha^{-1}\) (Ton/ha) if the bulk density of the soil is 1.01  \(Mg m^{-3}\)  is option a. 0.202 Mg/ha.

For expressing the soil loss in \(Mg ha^{-1}\), need to convert the units appropriately. First, convert the soil loss from millimetres (mm) to meters (m) by dividing it by 1,000 (1 mm = 0.001 m). Thus, the soil loss is 0.0002 m.

Next, calculate the volume of soil lost per unit area (ha). The volume can be obtained by multiplying the soil loss (0.0002 m) by the area (ha). Since the bulk density of the soil is given as 1.01 \(Mg m^{-3}\), can convert the volume to mass by multiplying it by the bulk density.

Using the formula:

Soil loss (Mg ha-1) = Soil loss (m) × Bulk density (\(Mg m^{-3}\)) × Area (ha)

Substituting the values:

Soil loss (\(Mg ha-1\)) = 0.0002 m × 1.01 \(Mg m^{-3}\) × 1 ha

Calculating the result:

Soil loss (\(Mg ha-1\)) = 0.0002 × 1.01 = 0.000202 \(Mg ha-1\)

Therefore, the correct answer is option a. 0.202 Mg/ha.

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The weight will be 80N.

Given :- Weak Gravitational field of moon relative to earth ,

F=1.6N

To find : Weight of a 50Kg mass on Moon .

Principle - Weight and mass although sounding same has different roles in Physics . Mass is the amount of matter that is utilized to build a material while talking about weight means its inclusive of an exertion of earth with the application of mass. Mathematically weight w= mg [Product of mass and gravity ]

Now in this question using basic unitary method we can resolve the ask of question. For example cost of one pen is 2rupee then cost of 2 pens is 4 rupees.

Reasoning- As per question , weight of 1 kg = 1.6N

so weight of 50Kg= 1.6 x 50⇒80N

Hence the amount of 80N equivalent weight is computed.

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The tension in the string is calculated as 10 N. Therefore, the correct answer is option b. It is given that a 50-g stone is tied to the end of a string and whirled in a horizontal circle of radius 2 m at 20 m/s.

Ignoring the force of gravity, the tension in the string is given by the following equation;

Tension, T = Centripetal force

Fc = (mv²)/r

Here, m = 50 g

= 0.05 kg

v= 20 m/s

r = 2 m

Therefore, T = [(0.05 kg)(20 m/s)²]/2 m

So, T  = (0.05 kg)(400 m²/s²)/2 m

Hence, T  = 10 N

Thus, the tension in the string is calculated to be 10 N.

Therefore, the correct option is b.

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Answer:

London Dispersion forces are a part of wan-der-vals forces. The instantaneous dipole–induced dipole attractions are called London dispersion forces.

London’s dispersion force < dipole-dipole < H-bonding < Ion-ion

London dispersion forces are the weakest intermolecular force.

The unequal distribution of electrons about the nucleus in an atom induces a dipole in the atom. When another atom or molecule comes in contact with this induced dipole, it can be distorted and leads to an electrostatic attraction between atoms or molecules.

Explanation:

The vertical velocity changes because gravity is what brings the ball downwards, since gravity is what cause acclereation in free fall, acclereatiin will make the velocity become more negative.

There is no force happening on the ball in the horinzontal direction so according to Newton 1st law, the ball will remain in constant velocity n the horinzotnal direction.

In addition to accommodation, the lens of the eye also performs a process called refraction. Refraction is the bending of light as it passes through the lens, which helps to focus the incoming light onto the retina, enabling clear vision. The lens achieves this by changing its shape, becoming thicker or thinner, through a process known as ciliary muscle contraction or relaxation. When focusing on near objects, the ciliary muscles contract, causing the lens to thicken and increase its refractive power. Conversely, when focusing on distant objects, the ciliary muscles relax, causing the lens to flatten and decrease its refractive power. This dynamic adjustment of the lens allows the eye to focus on objects at varying distances, providing clear vision at different focal points.

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Answer:

If the helicopter is not moving, then it is not being accelerated.

By second Newton's law we have that:

F = m*a

Force equals mass times acceleration.

Then if we do not have acceleration, we have:

F = m*a = m*0 = 0.

Then the total force must be zero.

So if the gravitational force (pulling down) is 115N, then the force of the propeller must be such that:

Total force = F - 115N = 0

F = 115N

The force of the propeller must be also of 115N, but in the opposite direction.

Answer:

1.5g/cm³

Explanation:

Given parameters:

Initial volume of the liquid  = 30cm³

Final volume of the liquid  = 50cm³

Mass of the liquid  = 30g

Unknown:

Density of the liquid  = ?

Solution:

Density is the mass per unit volume of a substance.

  Density  = \(\frac{mass}{volume}\)  

volume of the liquid  = final volume - initial volume  =  50cm³  -  30cm³

 volume of the liquid  = 20cm³

Density  = \(\frac{30}{20}\)   = 1.5g/cm³

(a) The change in internal energy of the gas is 452 J, and (b) the energy that must be added to the gas by heat along the indirect path is 1752 J.

(a) The change in internal energy of a gas is given by the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

Along the diagonal path from I to F, no work is done by the system because the volume of the gas does not change. Therefore, W = 0.

The energy added to the gas by heat is Q = 452 J.

So, ΔU = Q - W = 452 J - 0 J = 452 J.

Therefore, the change in internal energy of the gas is 452 J.

(b) For the indirect path IAF, the change in internal energy of the gas is the same as in part (a), which is ΔU = 452 J.

Along the indirect path, the gas undergoes two processes:

From I to A, the volume of the gas is kept constant (isochoric process), so no work is done by the system. The heat added to the system is:

Q_1 = ΔU = 452 J

From A to F, the gas expands and does work on the surroundings. The work done by the gas is given by the area under the PV curve between points A and F. This area can be divided into a rectangular part and a triangular part:

The rectangular part represents the work done by the gas when it expands from A to C at constant pressure. The pressure is given by the value of P at point A, which is 4.5 × 10^5 Pa. The volume change is given by the difference in volume between A and C, which is 0.0025 m^3 - 0.0010 m^3 = 0.0015 m^3. Therefore, the work done by the gas during this process is:

W_1 = PΔV = (4.5 × 10^5 Pa)(0.0015 m^3) = 675 J

The triangular part represents the work done by the gas when it expands from C to F along the path CF. The pressure varies linearly with volume along this path, so the average pressure can be calculated as (P_C + P_F)/2. The volume change is given by the difference in volume between C and F, which is 0.0050 m^3 - 0.0025 m^3 = 0.0025 m^3. Therefore, the work done by the gas during this process is:

W_2 = (P_C + P_F)/2 × ΔV = (2.5 × 10^5 Pa)(0.0025 m^3) = 625 J

The total work done by the gas along the indirect path is:

W = W_1 + W_2 = 675 J + 625 J = 1300 J

Now, the energy that must be added to the gas by heat along the indirect path is:

Q = ΔU + W = 452 J + 1300 J = 1752 J

So, the energy that must be added to the gas by heat along the indirect path is 1752 J.

Therefore, The gas's internal energy changes by 452 J and heat must add 1752 J to the gas to make up the difference along the indirect path.

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Answer:

fossil fuels are natural and limited, nuclear is man made and more toxic

Explanation:

Answer:

R= v/I

R= 9/1.05=8.5714 ohms

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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Conducting multiple 60-minute observations over the course of several hours would give a more complete picture than making a single observation for a longer or shorter period of time.

Quantitative data gathering techniques frequently rely on mathematical calculations, thus the information gathered in this way is typically regarded as being more objective and trustworthy than qualitative data.

calculating how many pieces can be put together in an hour by a worker. A restaurant chain employs Mikayla in the planning division.

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Answer:

yes it is

Explanation:

The mass of this bag of cement in S.I. units (kg) is equal to 0.062 kilograms.

Given the following data:

To calculate the mass of this bag of cement in S.I. units (kg):

In Science, kilograms (kg) is the standard unit of measurement or S.I. units of the mass of a physical object. Thus, we would convert the value of the mass of this bag of cement in grams to kilograms (kg) as follows:

Conversion:

1000 grams = 1 kilograms.

62 grams = X kilograms.

Cross-multiplying, we have:

X = \(\frac{62}{1000}\)

X = 0.062 kilograms.

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The following are some examples of the functional dependencies that can be held:

PX, PY, and PZ →VX

PX, PY, and PZ →VY

PX, PY, and PZ →VZ

Functional dependency is a term that describes a constraint that is usually used to explain the link between two (2) different sets of attributes, where one set may predict the true value of the other attributes accurately and uniquely.

The coordinates of the molecule in this example would be PX, PY, and PZ, while the velocities of those coordinates would be VX, VY, and VZ. Functional dependencies can so be illustrated by the following examples:

PX, PY, and PZ → VX

PX, PY, and PZ → VY

PX, PY, and PZ → VZ

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EAC( Low-energy lightbulb )=18.47 EAC( Conventional lightbulb )=7.33 Conventional lightbulb is cheaper to operate. Option D

To calculate the Equivalent Annual Costs (EAC), we need to consider the initial cost, maintenance costs, and the present value of future costs, taking into account the discount rate.

The EAC (Equivalent Annual Cost) is calculated by summing up the annual costs of the lightbulb over its lifetime, discounted at the real discount rate of 4%.

For the low-energy lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $3.60 + ($2.00 / (1 + 0.04)^1) + ($2.00 / (1 + 0.04)^2) + ... + ($2.00 / (1 + 0.04)^9)

≈ $18.47

For the conventional lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $0.60 + ($7.00 / (1 + 0.04)^1) + ($7.00 / (1 + 0.04)^2) + ... + ($7.00 / (1 + 0.04)^1)

≈ $7.33

Since the EAC for the low-energy lightbulb is $18.47 per year and the EAC for the conventional lightbulb is $7.33 per year, the conventional lightbulb is cheaper to operate assuming a burnt-out bulb is replaced by an identical bulb.

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Answer:

The right option is;

d) Both technicians A and B

Explanation:

High-intensity discharge (HID) headlights is an electrical gas-discharge light that gives a very bright light when an arc is formed between the tungsten electrodes that have a transparent or translucent housing

The light is ideal for night driving due to its brightness and appear to have a bluish tint at night although the light produced by HID headlight is actually more similar to Sunlight around noon

A turn signal bulb is a flashing light indicator that shows that a vehicle is about to turn or change lanes

An issue with the wiring, a broken connection at the bulb socket or a burnt bulb can result in a condition of "no turn signal" in which the turn signal stops flashing or blinking. Therefore both technicians A and B are correct.

The time taken by the electron from one plate to reach the other plate is 1.12 x 10⁻¹⁷ s

Two metal plates separated by the distance = 15 cm

                                                                          = 0.15 m

The electric field between the plates = 3 x 10³ N/C

The mass of the electron = 9.1 x 10⁻³¹ kg

The charge of the electron = 1.6 x 10⁻¹⁹ C

The time taken by the electron to hit the other plate can be found using the formula,

             d = 1/2at² + vt

where d is the distance between the plate

           a is the acceleration of the electron

           t is the time taken by the electron

          v is the velocity of the electron.

Let us find the acceleration of the electron

             a = E/m

where E is the electric field of the electron

           m is the mass of the electron

             a =  3 x 10³ / 9.1 x 10⁻³¹

                =  3.27 x 10³³m/s²

Let us substitute the known values in the distance equation, we get

             d = 1/2at² + vt

         0.15 = 1/2 x 3.27 x 10³³ x t² x 0t [ the initial velocity of the electron is zero]

             t² = 2 x 0.15 / 3.27 x 10³³

                 = 0.3 / 3.27 x 10³³

                 =  0.0917 x 10⁻³³

                 = √ (0.0917 x 10⁻³³)

                 = 1.12 x 10⁻¹⁷ s

Therefore, the time taken by the electron is 1.12 x 10⁻¹⁷ s

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Meteoroids, small rocky or metallic objects that orbit the Sun, often disintegrate rather than reaching the Earth's surface due to several factors like Atmospheric friction, Compression and stress etc.

Meteoroids, small rocky or metallic objects that orbit the Sun, often disintegrate rather than reaching the Earth's surface due to several factors:

1. Atmospheric friction: When a meteoroid enters the Earth's atmosphere, it encounters the resistance of the air molecules. This rapid interaction generates intense heat through compression, leading to the vaporization or melting of the meteoroid's outer layers. The intense heat causes the meteoroid to disintegrate into smaller fragments or vaporize completely.

2. Compression and stress: The rapid deceleration caused by atmospheric friction exerts significant compression and stress on the meteoroid. Depending on its composition and structural integrity, the meteoroid may not be able to withstand the forces, leading to fragmentation and breakup. Weaker or less cohesive meteoroids are more prone to disintegration.

3. Size and composition: Meteoroids vary in size, ranging from tiny grains to larger objects several meters in diameter. Smaller meteoroids have a higher surface-to-volume ratio, meaning that a larger portion of their mass is exposed to atmospheric forces. Consequently, smaller meteoroids are more likely to disintegrate due to the increased surface area experiencing atmospheric friction. Moreover, meteoroids composed of weaker materials, such as loosely bound aggregates or porous structures, are more susceptible to disintegration.

4. Speed and angle of entry: The speed and angle at which a meteoroid enters the atmosphere influence the intensity of atmospheric friction and the likelihood of disintegration. Higher entry velocities and steeper angles generally result in more significant atmospheric heating and stress, increasing the probability of disintegration.

It is important to note that not all meteoroids disintegrate entirely. Some larger and more robust meteoroids can survive atmospheric entry and reach the Earth's surface as meteorites.

However, the majority of meteoroids, especially smaller ones, disintegrate and burn up in the atmosphere, producing the visual phenomenon known as meteors or shooting stars.

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Billy jumps upward with a velocity of 4.2 m/s off a 6m high diving board.  . Billy will take 0.43 sec  to hit the water

The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics.

using equation of kinematics

v = u + g*t

sign convention

positive y direction (upward) = +

negative y direction ( downward )  = -

v = u - g*t

0 = 4.2 - ( 9.8 * t )

t = 4.2 / 9.8

t = 0.43 sec

Billy will take 0.43 sec  to hit the water

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Answer:

Example

Write 81 900 000 000 000 in standard form: 81 900 000 000 000 = 8.19 × 1013

It’s 1013 because the decimal point has been moved 13 places to the left to get the number to be 8.19

Answer:

you are very most correct

Explanation:

it does have something to do with terminal velocity and because the weight is so light of it any tiny gust of wind can push it back and forth and because wind is never stable thats why it moves side to side

Answer:

yes

Explanation:yes

Answer:

Yes

Explanation:

Earth is accelerated around the sun

Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

Answer:

360 degrees is one full rotation starting at zero

it take 2 s  to the flag to rotate once in a full circle  with 3 rad/s of angular velocity.

Angular velocity is "rate of change of angular displacement with respect to time". i.e. ω= dθ/dt. it is also defined as angular displacement over time. i.e. ω = angular displacement/Time.

Angular velocity shows how much angle can be covered in unit time. It's SI unit rad/s.

Angular acceleration is rate of change of Angular velocity with respect to time.

i.e. α = dω/dt if an object changes its angular velocity in short time, we can say that it has greater angular acceleration. It is expressed in rad/s².

In this problem we have to calculate time, but the angular velocity id not given.

Consider the angular velocity is 3 rad/s.

Given,

Angular displacement θ = 2π

angular velocity ω = 3 rad/s

Time t = ?

Time = θ/ω

Time = 2π/3 rad/s = 2 s

Hence the answer is 2s.

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To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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Answer:

3040 torr

Explanation:

Applying,

PV = P'V'..................... Equation 1

Where P = Initial Pressure, V = Initial volume, P' = Final pressure, V' = Final volume.

Make P' the subject of the equation

P' = PV/V'................. Equation 2

From the question,

Given: P = 760 torr, V = 56.2 L, V' = 56.2/4 = 14.05 L

Substitute these values into equation 2

P' = (56.2×760)/14.05

P' = 3040 torr