What is the tail of a comet made of?

Answer:

(1)540 J

(2)67.5 J/s or 67.5W

(3)look at underline statement in explanation

Explanation:

(1) acceleration = change in speed ÷ time

= (9-5)m/s ÷ 8s

= 0.50 m/s²

resultant force of object during motion

= mass(in kg) × acceleration

= 6 × 0.50 = 3 N

displacement of force applied

= area under speed time graph(when sketched out, it's a trapezium)

= ½ × (5+9) × 8

= 180m

work done is measured in joules

= force × displacement of force applied

= 3N × 180m

= 540 J

detailed explanation:

altho the final unit for the work done should be Nm, but J is equal to Nm.

(2) Power is measured by J/s

therefore power = 540 J ÷ 8s = 67.5 J/s or 67.5 W

(3) the object accelerates constantly along a straight road

Grounding of electrical equipment is the primary method of reducing electrical hazards for several reasons Safety during faults, Voltage stabilization, Surge protection, etc.

Grounding of electrical equipment is the primary method of reducing electrical hazards for several reasons:

Safety during faults: Grounding provides a low-resistance path for electrical current to flow in the event of a fault or electrical malfunction. When a fault occurs, such as a short circuit or equipment failure, excessive current can flow through the grounding system, which helps to quickly and safely divert the current away from people and equipment. This helps prevent electric shocks, electrical fires, and damage to the electrical system.

Voltage stabilization: Grounding helps stabilize the voltage levels in electrical systems. By connecting the electrical equipment to the ground, any excess electrical charge or static electricity can be discharged to the ground, maintaining a stable and safe voltage level throughout the system.

Surge protection: Grounding helps protect electrical equipment from voltage surges caused by lightning strikes, power grid fluctuations, or switching operations. When a surge of high voltage occurs, the excess energy can be safely redirected to the ground through the grounding system, preventing damage to the equipment and reducing the risk of electrical fires.

Equipment protection: Grounding helps protect electrical equipment by providing a reference point for proper operation. It ensures that all equipment components, such as metal cases or enclosures, are at the same potential as the ground, reducing the risk of electric shock when touching the equipment.

EMI/RFI mitigation: Grounding helps mitigate electromagnetic interference (EMI) and radio frequency interference (RFI) by providing a path for unwanted electrical signals to be dissipated into the ground. This helps reduce electrical noise and interference, ensuring proper functioning of sensitive electronic equipment and communication systems.

Overall, grounding is essential for electrical safety as it helps prevent electric shocks, protects equipment, stabilizes voltages, and mitigates electrical hazards. It is a fundamental practice in electrical installations to ensure the safe and reliable operation of electrical systems.

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Explanation:

friction always acts in the opposite direction as motion.

Answer:

In Explanation

Explanation:

The transition from ocean to cloud refers to the process by which water vapour in the ocean rises and condenses into clouds. This process is known as evaporation and is a key component of the water cycle.

Evaporation occurs when the sun's energy heats the surface of the ocean, causing water molecules to gain enough energy to escape into the atmosphere as water vapour. As the water vapour rises, it cools and condenses into tiny droplets, which form clouds. The clouds can be made of water droplets or ice crystals, and they can be observed in the sky in different forms, such as stratus clouds, cumulus clouds, and cirrus clouds.

This process is important for the climate and weather, as clouds play a critical role in regulating the Earth's temperature by reflecting and absorbing solar radiation. Clouds also affect precipitation, as the droplets or crystals in the clouds grow and fall as rain or snow. The transition from ocean to the cloud is also important for the water cycle as precipitation, either in form of rain or snow, replenishes the water in the oceans and rivers.

In summary, the transition from ocean to the cloud is the process by which water vapour in the ocean rises and condenses into clouds, known as evaporation, and is a key component of the water cycle. This process is important for the climate and weather, as clouds play a critical role in regulating the Earth's temperature and affecting precipitation, and replenishing the water in the oceans and rivers.

(Please give brainlist)

I think when it is at it's highest point. (2)

hope this helps ^-^

Answer:

2 and 3

Explanation:

The amount of work Katrina does on herself and the skateboard is equal to the kinetic energy held by her and the skateboard.

We know that work is said to be done when the force that is applied moves a distance in the direction of the force. In this case we can see that Katrina pushes off a flat sidewalk on her skateboard.

We also know that the energy that is possessed by a body that is in motion is the kinetic energy of the object. We can see that immediately that  Katrina pushes off a flat sidewalk on her skateboard, she is already moving and this would mean that she does have a kinetic energy in the context of our discussion here.

With the knowledge that the work and the energy are equivalent terms it is clear that the kinetic energy would equal the work done.

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The final velocity of the cannon camera is 22m/s

We are informed in this query that David will launch from a journey at his final speed. Consequently, it is 80 kilometers per hour. Therefore, we must convert. Listen at a 2 m/s rate. In order to convert our number of 80 into units, we must multiply it by the number of meters in a club. As a result, his final velocity equals 22.2.

a= v/ t = 56m/sec square dec acceleration = 80km/h converting into final velocity m /s sec its 22.2m/s

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Answer:

The first object is positively charged, and the second object is negatively charged. (D)

Explanation:

The tension needed to tune a grand piano string with a frequency of 27.5 Hz and a length of 1.90 m is 5,129 N.

The tension required to tune the string can be calculated using the following formula:

T = (mu * v^2) / L

Where T is the tension, mu is the string's linear mass density (mass per unit length), v is the wave's speed on the string, and L is the span of the string's vibrating portion.

To begin with, we must figure out the string's linear mass density:

mu = m/L = 0.440 kg/1.8 m = 0.2316 kg/m

The speed of the wave on the string needs to be calculated next. The equation: gives the speed of a wave on a string.

sqrt(T/u),

T represents tension, and u represents linear mass density. This equation can be changed to:

T = u

The tension required to tune the string can be calculated using the following formula:

T = (mu * v^2) / L

Where T is the tension, mu is the linear mass density of the string (mass per unit length), v is the speed of the wave on the string, and L is the length of the vibrating section of the string.

First, we need to calculate the linear mass density of the string:

mu = m / L = 0.440 kg / 1.90 m = 0.2316 kg/m

Next, we need to calculate the speed of the wave on the string. The speed of a wave on a string is given by the formula:

v = sqrt(T/u)

where T is the tension and u is the linear mass density. Rearranging this equation gives:

T = u * v^2

Substituting in the values we have:

v = f * lambda

where f is the frequency and lambda is the wavelength of the wave. The wavelength can be calculated from the length of the vibrating section of the string:

lambda = 2 * L = 3.80 m

Substituting in the values we have:

v = f * lambda = 27.5 Hz * 3.80 m = 104.5 m/s

Now we can calculate the tension:

T = u * v^2 / L = 0.2316 kg/m * (104.5 m/s)^2 / 1.90 m = 5,129 N

Therefore, the tension needed to tune this string properly is 5,129 N.

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a) The total resistance of the circuit in which three 45 ohm lightbulbs and three 75 ohm light bulbs connected in series is 360 ohm.

b) The total resistance of the circuit if all six are wired in parallel is 28.57 ohm.

a) In order to find the series total resistance, we need to add all resistances,

Req = R₁ + R₂ + R₃ + R₄ + R₅ + R₆ = 45 + 45 + 45 + 75 + 75 + 75 = 135+ 225 = 360 ohm

b) Now, since the resistances are in parallel, we need to use the expression below,

1/Req = 1/R₁ + 1/R₂ + 1/R₃ + 1/R₄ + 1/R₅ + 1/R₆

Putting in the values,

1/Req = 1/45 + 1/45 + 1/45 + 1/75 + 1/75 + 1/75

1/Req = 1/0.035

Req = 28.57 ohm

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The radius of a white dwarf is determined by a balance between the inward force of gravity and the outward push of electron degeneracy pressure.

No two electrons with the same spin may occupy the same energy level in the same volume, according to the Pauli exclusion principle. The other electrons are forced into higher and higher energy states as soon as the lowest energy level is occupied, which causes them to move at ever faster rates. These quickly moving electrons create an electron degeneracy pressure strong enough to host a star. The Chandrasekhar limit (the highest mass a white dwarf may achieve) develops naturally as a result of the physics of electron degeneracy, and electron degeneracy pressure in particular is what supports white dwarfs in addition to gravitational collapse.

As a white dwarf's mass approaches the Chandrasekhar limit, gravity works to compress the star into a smaller space, which forces electrons to move through higher energy states and at higher speeds. At the Chandrasekhar limit, the star can no longer be sustained by the pressure of electrons moving at almost light speed, and the white dwarf collapses into a considerably denser state.

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Therefore, the work done by the force F=12i-10j on an object as it moves from the origin to the point r=13i+11j is 203.06i + 171.82j.

The formula for calculating the work done by a force F when an object is moved from point A to point B is:

W = F. d

Where, W = work done by the force F, F = magnitude of the force, d = displacement vector of the object from point A to point B

Therefore, the work done by the force F=12i-10j on an object as it moves from the origin (point A) to the point

r=13i+11j (point B) can be calculated as follows:

First, we need to find the displacement vector (d) of the object from point A to point B. This is given as:

r - r0 = 13i + 11j - 0i - 0jr - r0 = 13i + 11j - 0 - 0j (where r0 = 0i + 0j is the position vector of the origin

So, the displacement vector of the object from point A to point B is

d = 13i + 11j.

Next, we need to find the magnitude of the force F, which is given as:

F = 12i - 10j

Magnitude of F = √(12² + (-10)²) = √(144 + 100) = √244 = 15.62 (approximately)

Now, we can use the formula W = F. d

to find the work done by the force

F.W = F. d= (15.62)(13i + 11j) (since F = 12i - 10j)

W = (15.62)(13i) + (15.62)(11j)

W = 203.06i + 171.82j

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Answer:

Gamma rays

Explanation:

Answer:

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

Answer:

Acceleration = 5.77 m/s²

Distance cover in 13 seconds = 487.56 meter

Explanation:

Given:

Final velocity of mobile device = 75 m/s

initial velocity of mobile device = 0 m/s

Time taken = 13 seconds

Find:

Acceleration

Distance cover in 13 seconds

Computation:

v = u + at

75 = 0 + (a)(13)

13a = 75

a = 5.77

Acceleration = 5.77 m/s²

s = ut + (1/2)(a)(t²)

s = (0)(t) + (1/2)(5.77)(13²)

Distance cover in 13 seconds = 487.56 meter

Answer:

Yes, that is correct, although most velocity is calculated via m/s and therfore you would multiply your 3 hours by 60 twice. Much of the information given is irrelevant and just trying to confuse.

Explanation:

The final coordination is (3,-7,-4).

Coordinates are written as (x, y) which means the factor at the x-axis is written first, observed by the point at the y-axis. a few youngsters may be taught to consider this with the phrase 'along the corridor, up the stairs, which means that they need to follow the x-axis first after which the y.every factor may be identified by means of an ordered pair of numbers; this is, more than a few at the x-axis called an x-coordinate, and a range of at the y-axis called a y-coordinate.

The point at which the 2 axes intersect is called the origin – the coordinates of this point are (0, zero). Coordinates are written as (x, y) which means the point on the x-axis is written first, followed by the point on the y-axis.

According to question;-

Initially you are at: (0, 0, 0)

you move 3 units along the positive x-axis: (3, 0, 0)

you move 5 units in the negative z-axis: (3, 0, -4)

this is the final position (3,-7,-4)

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Answer:

The answer is "Option B and Option D"

Explanation:

Isopropyl alcohol has an air pressure of 22,39 units with such a water contact angle of 72,86 units.

The melting points of Isopropyl alcohol are higher than water because of the weaker forces between the previously studied.

The flatter meniscus is indeed the isopropyl ethanol so because forces between the particles are smaller.

The terminal speed of the marble is 0.588 m/s.

The term "force" has a specific meaning in science. At this level, calling a force a push or a pull is quite appropriate. A force is not something an item "has in it" or that it "contains." One thing experiences a force from another. There are both living things and non-living objects in the concept of a force.

We know that,

F = mg                          ......(1)

where,

F = force

m = mass

g = acceleration due to gravity

Also,

v = F/k                            ......(2)

where,

v = terminal speed

k = proportionality constant

Substituting the value of F from equation (1) in equation (2)

v = mg/k                             .......(3)

Given,

m = 30 g = 0.030 kg

k = 0.500 kg/s

g = 9.8 m/s²

To find,

v =?

Put the values in equation (3)

v = mg/k        

v = 0.03(9.8)/ 0.500

= 0.294/0.500

= 0.588 m/s

​

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Answer:

16m

Explanation:

Given parameters:

Time  = 4s

Initial velocity  = 0m/s

Acceleration  = 2m/s²

Unknown:

How far will the body move  = ?

Solution:

To solve this problem, we use the expression below:

  s  = ut  + \(\frac{1}{2}\) at²  

s is the distance

u is the initial velocity

t is the time

a is the acceleration

   s  = (0 x 4) + ( \(\frac{1}{2}\) x 2 x 4²)  = 16m

The energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

To calculate the energy per photon, we can use the equation: E = hf, where E represents the energy, h is the Planck's constant (6.62607015 × 10^-34 J·s), and f is the frequency of the photon. Given that the frequency is 1260 kHz, we need to convert it to hertz (Hz) by multiplying it by 10^3:

Frequency = 1260 kHz × 10^3 = 1.26 × 10^6 Hz

Now, we can substitute the values into the equation:

E = (6.62607015 × 10^-34 J·s) × (1.26 × 10^6 Hz)

E = 8.33929859 × 10^-28 J

The answer is given in scientific notation as 8.34 × 10^-28 J. However, the question specifically asks for the answer in the format of 0.00×10^0. To achieve this, we can multiply the result by 10^3 and adjust the exponent accordingly:

E = (8.33929859 × 10^-28 J) × (10^3)

E = 8.33929859 × 10^-25 J

Thus, the energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

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Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic ye

A "galactic year" refers to the time it takes for our solar system to complete one orbit around the Milky Way galaxy. The exact duration of a galactic year is not precisely determined due to various factors, such as the varying speeds of stars within the galaxy. However, it is estimated to be roughly 225-250 million years.

To calculate the number of galactic years Earth has been around based on the age of the solar system (4.6 billion years), we can divide the age of the solar system by the estimated duration of a galactic year:

Number of Galactic Years = Age of the Solar System ÷ Duration of a Galactic Year

Number of Galactic Years = 4.6 billion years ÷ 225-250 million years

Number of Galactic Years ≈ 18.4 to 20.4 galactic years

Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic years.

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Answer:

D. All of the above

Explanation:

Because it's the most logical answer.

answer:

speed direction displacement is the change in position of an object in relation to a reference point, so it always includes a direction.

The work done on the ball can be calculated using work-energy theorem, the work done on an object is equal to the change in its kinetic energy.

In this case, the ball's kinetic energy (KE) is changed from 20 J to 35 J. To find the work done, simply subtract the initial KE from the final KE:
Work Done = Final KE - Initial KE
Work Done = 35 J - 20 J
Work Done = 15 J
So, 15 joules of work is done on the ball to change its kinetic energy from 20 J to 35 J.

The energy that a body has because it is in motion is known as kinetic energy. Particles in solids are packed very firmly and closely together. Inside the solid, they are not at liberty to move. Only when energy is given to them, such as when the solid is heated, can they oscillate around their mean position. Particles' kinetic energy is caused by their velocity. Even if the particles move, their velocity will be very, very modest if they don't move at all. Therefore, there will be very little kinetic energy.

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Answer:

1080000

Explanation:

300 x 60s=18000m/minute

18000 x 60min=1080000m/h

Answer:

Explanation:

The answer is [C]

The correct answer is velocity.

The vector measure of level and direction of motion is known as velocity. The speed at which an object goes in one direction is known as its velocity. Speed may be used to calculate both the speed of the car traveling north on the major highway and the speed of the rocket bursting in space. As you may expect, the vector velocity's scalar size (total value) corresponds to the movement's speed. Speed is the initial exit of a place in terms of time when it comes to computations. A straightforward formula that incorporates measurement, distance, and time can be used to determine speed.

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The initial velocity of the car as it slow to rest with an acceleration of -5 m/s² is 11.5 m/s.

This can be defined as the ratio of displacement to the time of a body

To calculate the initial velocity of the car, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the initial velocity of the car is 11.5 m/s

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