The maximum allowable resistance for an underwater cable is one hundredth of an ohm per
meter and the resistivity of copper is 1. 54 x 10-80m.
a) Calculate the smallest cross sectional area of copper cable that could be used. ​

The line spacing you need for your diffraction grating is approximately 45454.55 lines/mm.

To calculate the line spacing you need for your diffraction grating in lines/mm, you can use the formula:

Line spacing (in mm) = 1 / (number of lines per mm)

Given that the screen is 10 meters away and the spacing between spots there should be 22 cm, we need to convert the screen distance and spot spacing to meters.

Screen distance = 10 meters
Spot spacing = 22 cm = 0.22 meters

Now, let's calculate the number of lines per meter by dividing the screen distance by the spot spacing:

Number of lines per meter = Screen distance / Spot spacing

Number of lines per meter = 10 meters / 0.22 meters = 45.45 lines/meter

To convert the number of lines per meter to lines per millimeter, we need to multiply it by 1000:

Number of lines per mm = Number of lines per meter * 1000

Number of lines per mm = 45.45 lines/meter * 1000 = 45454.55 lines/mm

Therefore, the line spacing you need for your diffraction grating is approximately 45454.55 lines/mm.

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Answer: Body senses provide you with information about the position of your body in respect to your environment. The four main ones are touch, pain, vestibular, and kinesthesis.

More in details:

Our senses allow us to experience the world we live in, and are one of the key components of consciousness. ... This is why the study of our senses, or sensation, is considered to be such an important area of psychology, because it is one of the key components that makes consciousness possible.

The altitude h is around 344 kilometers.

We'll start by utilizing the condition for the expanding speed of a dissent moving in a circular way:

a = v²/r

where a is the speeding up,

v is the speed,

r is the span of the circular way.

Since the attendant is moving in a circular way around the Soil, we'll anticipate that the speeding up is due to the gravitational imperative between the fanatic and the Soil. The speeding up due to gravity at a height of h over the Earth's surface is given by:

a = GM/r²

where G is the gravitational relentless,

M is the mass of the Soil,

r is the division between the center of the Soil and the attendant (which is rise to the aggregate of the span of the Soil

the stature h of the disciple).

Comparing the two expressions for expanding speed and understanding for h, we get:

GM/r² = v²/r + a

GM = r(v²/r + a)

GM = v² + ar

r = (GM/a) / (v²/a + 1)

Substituting the given values, we get:

r = ((\(6.67 x 10^-11\) Nm²/kg²) x (\(5.97 x 10^24\)\(5.97 x 10^24\) kg) / (2.5 m/s²)) / ((20 x 10^6 m/h)^² / (3600 s/h)² + 1)

r =\(6.7 x 10^6\) m

The stature h of the stooping is at that point:

h = r - (Earth's sweep)

h = \(6.7 x 10^6\) m - \(6.356 x 10^6\) m

h = 344,000 meters or 344 kilometers

In this way, the altitude h (stature) is around 344 kilometers. 

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Answer:

We can reasonably improve a machines ability to do work by reducing the friction between the moving parts of machine.

Explanation:

According to the law of conservation of energy, the energy can neither be created nor destroyed.

Answer:

There is 16 m gap between the deer and the car.

We know that the acceleration is the rate of change of the velocity with time. Let us recall that the acceleration is a vector quantity and the direction is important here. Now, we have the following;

Initial velocity = 21 m/s

Final velocity = 0 m/s

Acceleration = 10 m/ s 2

Distance = 38 m

Given that we want to obtain the distance, we have to use;

V^2 = u^2 - 2as

Now v = 0 m/s because the object comes to a stop

v = final velocity

u = initial velocity

a = acceleration

s = distance covered

s = u^2 /2a = ( 21 m/s)^2/ 2 * 10 m/ s 2

= 22  m

The distance that is left between you and the deer = 38 m -  22  m = 16m

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Answer:

C is the answer for the question

Answer:

reflection iim pretty sure

Explanation:

Answer:

Once the weighted end of the pendulum is released, it will become active as gravity pulls it downward. Potential energy is converted to kinetic energy, which is the energy exerted by a moving object. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.

Explanation:

The acceleration that the net force will cause is 7.5 m/s²

To solve this problem, first, we need to find the net force.

⇒ Equation:

F = ma................ Equation 1

⇒ Where:

From the question,

⇒ Given;

⇒ Substitute these values into equation 1

We also use the same equation 1 to find the acceleration that the net force will cause to a box of mass 2.8 kg.

⇒ make a the subject in equation 1

⇒ Substitute the appropriate values into equation 2

Hence, The acceleration that the net force will cause is 7.5 m/s²

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The potential difference across the lamp as calculated is 116.6 volts.

Given: Resistance (R) = 136 ohms, Power (P) = 1.00 x 10² W. We need to calculate the potential difference across the lamp. We know that; Power = (Potential Difference)² / Resistance.

We can write the above formula as, Potential Difference = √(Power x Resistance)By substituting the values in the above formula; Potential Difference = √(100 x 136)Potential Difference = √13600Potential Difference = 116.6 volts.

Therefore, the potential difference across the lamp is 116.6 volts.

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The mechanical advantage of a pulley system is calculated as the ratio of output force to input force. In this case, the output force is the weight of the load being lifted, which is 120 N, and the input force is the force applied to the pulley system, which is 20 N. Therefore, the mechanical advantage of the pulley system is:

Mechanical advantage = output force / input force

Mechanical advantage = 120 N / 20 N

Mechanical advantage = 6

Therefore, the mechanical advantage of the pulley system is 6. This means that for every 1 unit of force applied to the pulley system, the load is lifted with 6 units of force.

Answer: I had they same qustion

Explanation:

Answer:

This is important because in the case of the potassium atom, the outermost electrons will be attracted by the nucleus more. In other words, K+ has bigger effective nuclear charge than Cl− , which translates to a bigger net positive charge felt by the outermost electrons.

Explanation:

If the source moves away from you faster than the speed of sound in air, the frequency that you hear is lower than f.

Explanation:

This phenomenon is known as the Doppler effect.

The Doppler effect describes the change in frequency of a wave (such as sound or light) when there is relative motion between the source of the wave and the observer.

When the source moves away from the observer, the effective wavelength of the sound waves gets longer, resulting in a lower frequency being perceived by the observer.

This decrease in frequency causes the sound to be heard at a lower pitch.

Therefore, the correct answer is b. lower than f.

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Answer:CcCcccccc

Explanation:

Rfsgqh

The Archimedes principle is a principle that is expressed as a law that states that a body immersed in a fluid, whether fully or partially, is subject to an upward force of the same magnitude as the weight of the fluid it displaces.

Hope this helps :)

The frequency of the ultraviolet light given that its wavelength is 100 nm is 3×10¹⁵ Hz

The frequency of the light can obtain as illustrated below:

v = λf

3×10⁸ = 100×10¯⁹ × f

Divide both side by 100×10¯⁹

f = 3×10⁸ / 100×10¯⁹

f = 3×10¹⁵ Hz

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The time required for a vehicle to travel 500m if it starts from rest and accelerates at 4.5m/s² is 14.9 s.

Given:

s = 500 m

a = 4.5 m/s²

u = 0

Acceleration is the rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.

If an object starts from rest then it's initial velocity would be zero however if it is already in motion then it does have an initial velocity of greater than zero.

According to the Kinematic equation

s = ut  + 1/2 at²

s = 0 + 1/2 at²

t² = 2s/a = (500 x 2 )/ 4.5 = 222.222 s²

t = 14.9 s

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Answer:

Can you help me with this pls

Answer:

Scientific notation 6.42×10^21

Answer:

If the wave slows down with no change in frequency, the wavelength decreases.

If the wave slows down with no change in frequency, then the wavelength decreases.

A wave is defined as the disturbance that has the ability to transfer energy from one point to another in a medium.

The properties of a wave are given as;

Wavelength can be defined as the distance that is observed between adjacent points in an identical cycle of a waveform.

Frequency is the number of cycles of a wave that can occur per minute time.

Time period can be defined as the time it takes for a complete cycle of wave to occur.

Wave speed can be defined as the distance a wave travels in a given amount of time.

Amplitude can be defined as the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough.

When there is a change in the speed of the wave then the length of the wave would decrease.

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Answer:

Explanation:

Eustachian tube is located in between the middle ear and the nasopharynx.It's function is to control the pressure within the middle making it equal to the air pressure outside the body.

The statements true in regards to heat is 3. Heat is a form of energy, can be reflected by a mirror, and cannot pass through a vacuum.

Heat is a form of energy. Heat is the transfer of thermal energy from one object to another. Thermal energy is the energy of motion of the particles in an object. Heat can be reflected by a mirror. Heat is a form of electromagnetic radiation, and electromagnetic radiation can be reflected by mirrors.

Heat cannot pass through a vacuum. Heat is a form of electromagnetic radiation, and electromagnetic radiation cannot pass through a vacuum. Heat is not an electromagnetic radiation. It is a form of energy that is transferred from one object to another because of a difference in temperature.

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Complete question:

Which of the following statements are true regarding heat?

(a) Heat is a form of energy

(b) Heat can be reflected by mirror

(c) Heat is an electromagnetic radiation

(d) Heat can pass through vacuum

Select the correct answer from the codes given below :

1. 1, 2 and 3

2. 2, 3 and 4

3. 1, 2 and 4

4. 1, 3 and 4

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Answer:

I love yourself help yourself

Answer:

Explanation:

goes down as the temperature decreases, and vice versa. Sound's frequency is independent of temperature, while its speed is directly proportional to temperature. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. ... This is faster than 331 meters per second, which is the speed of sound in air at freezing temperatures.

hope this helps!!!!

Sound waves travel more fastly in hot air , since particles in atmosphere gets more energetic in higher temperature. Hence, as the temperature decreases, the wave’s speed decreases.

Sound waves are mechanical waves passing through a medium. Sound waves are longitudinal where, the oscillation of particles is along the direction of wave propagation.

Compression waves, which at a microscopic scale rely on molecules transmitting energy one to another, are used to convey sound through the air.

Higher temperatures produce more energetic air molecules, which vibrate more rapidly. As a result of the molecules colliding with one another, the sound waves can move more quickly.

Therefore, as the temperature decreases, the speed of sound wave decreases. Thus, option B is correct.

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The meaning of an object has 2 meter of length is that the value is 2 times bigger than the si unit.

Answer:

6.72 m/s

Explanation:

recall that the equations of motion may be expressed as

v² = u² + 2as

where,

v = final velocity,

u = initial velocity = 0 m/s because it is stationary before it starts falling

a = acceleration (in this case because it is falling, it is the acceleration due to gravity = 9.81 m/s²)

s = distance traveled = 2.3m

in our case, if we neglect air resistance, then we simply substitute the known values above into the equation of motion.

v² = u² + 2as

v² = 0² + 2(9.81)(2.3)

v² = 45.126

v = √45.126

v = 6.72 m/s

The maximum speed that the car can travel without slipping is 28 m/s.

For a car driving around a circular path not skid at maximum speed, then the centripetal force of the car must be equal to the static frictional force.

Fc = Fs

ma = μmg

a = μg

v²/r = μg

v² = rμg

v = √rμg

where;

v = √(100 x 0.8 x 9.8)

v = 28 m/s.

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