what is the weight of a cubic meter of cork? could you lift it? (use 400 kg/m3 for the density of cork.)

The possible stages of a star occur in a specific order. First, a protostar is formed from a dense cloud of gas and dust. Then, as the protostar contracts and heats up, it becomes a main-sequence star and begins to generate energy through nuclear fusion. This stage can last for billions of years until the hydrogen fuel in the star's core is depleted.

At this point, the star begins to expand and becomes a red giant, which is characterized by its increased size and cooler temperature. As the red giant burns off its outer layers, it sheds material and creates a planetary nebula. This stage can last for thousands of years until the star's core collapses and becomes a white dwarf.

The white dwarf is a small and hot remnant of the star's core that no longer generates energy. It will gradually cool down over billions of years until it becomes a cold black dwarf. In summary, the order in which the possible stages of a star occur is protostar, main-sequence star, red giant, planetary nebula, white dwarf, and finally a black dwarf.

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Answer:

B: transmission

Explanation: Transmission of waves occurs when waves pass through a given point or medium. Sound waves are transmitted through solids, liquids, and gases therefore the answer is the transmission

Answer:

50500

Explanation:

F = m x a

F = 2500kg x 20.2 m/s/S

F = 50500

\(\huge{\bold{\orange{\underline{ Solution }}}}\)

A harmonic wave on a string is described by

\(\sf{ Y( x, t) = 0.1 sin(300t + 0.01x + π/3)}\)

Equation for travelling wave :-

\(\sf{ Y( x, t) = Asin(ωt + kx + Φ)...eq(1)}\)

Equation for stationary wave :-

\(\sf{ Y( x, t) = Acos(ωt - kx )...eq(2)}\)

Given equation for wave :-

\(\sf{ Y( x, t) = 0.1 \:sin(300t + 0.01x + π/3)...eq(3)}\)

On comparing eq(1) , (2) and (3)

We can conclude that, Given wave represent travelling wave.

From solution 1 , We can say that,

\(\sf{ Y( x, t) = 0.1 \: sin(300t + 0.01x + π/3).}\)

It is travelling from right to left direction

Hence, The direction of its propagation is right to left that is towards +x direction.

Here, We have to find the wave period

We know that,

Wave period = wavelength / velocity

Wave equation :-

\(\sf{ Y( x, t) = 0.1 \:sin(300t + 0.01x + π/3).}\)

We know that,

\(\sf{v =}{\sf{\dfrac{ ω}{2π}}}{\sf{\: and\:}}{\sf{ λ =}}{\sf{\dfrac{ 2π}{k}}}\)

Subsitute the required values,

\(\sf{ wave\: period =}{\sf{\dfrac{ 2π/k}{ω/2π }}}\)

\(\sf{ wave \:period = }{\sf{\dfrac{k}{ω}}}\)

\(\sf{ wave\: period =}{\sf{\dfrac{ 0.01}{300}}}\)

\(\sf{ wave\: period = 0.000033\: s}\)

The wavelength of given wave

\(\bold{ λ = }{\bold{\dfrac{2π}{k}}}\)

Subsitute the required values,

\(\sf{ λ = }{\sf{\dfrac{2 × 3.14 }{0.01}}}\)

\(\sf{ λ = }{\sf{\dfrac{6.28}{0.01}}}\)

\(\sf{ λ = 628 \: cm }\)

We have wave equation

\(\sf{ Y( x, t) = 0.1 sin(300t + 0.01x + π/3).}\)

Travelling wave equation :-

\(\sf{ Y( x, t) = A\:sin(ωt + kx + Φ)...eq(1)}\)

Therefore,

Amplitude of the wave particle

\(\sf{ A = 0.1 \: cm}\)

Hence, The amplitude of the particle is 0.1 cm

Answer:

a. 3.46 m/s

b. 1.15 s

Explanation:

Given:

Δx = 2 m

v₀ = 0 m/s

a = 3 m/s²

a. Find v

v² = v₀² + 2aΔx

v² = (0 m/s)² + 2 (3 m/s²) (2 m)

v = 3.46 m/s

b. Find t

Δx = v₀ t + ½ at²

2 m = (0 m/s) t + ½ (3 m/s²) t²

t = 1.15 s

Answer:

a. 3.46 m/s

b. 1.15 s

Explanation:

Any online is a platform that allows students to access lecture notes, textbook solutions, and other study materials uploaded by other students. It does not have anything to do with predicting the decay time for a nucleus or observing patterns in nuclear decay.

However, in terms of nuclear decay, there are some patterns that can be observed. For example, the half-life of a radioactive substance is constant, regardless of the amount of material present. This means that the amount of material that remains after one half-life is always half of the original amount.

Watching what happens in the bottom-half of the display can provide information about the decay of a nucleus. The bottom-half of a decay curve represents the amount of material remaining over time. As time passes, the amount of material decreases exponentially. The half-life can be calculated from the decay curve by finding the time at which half of the material has decayed.

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The impulse is given by the area under the graph of F vs t, on a given interval.

Notice that the area under the given graph has the shape of a triangle. Its base has a "length" of 10 seconds, while its height is 5 Newtons. The area of a triangle is half the product of its base times its height. Then, the impulse on the object is:

Without more information about the specific scenario, it is difficult to determine the force acting on q with certainty.

However, we can use the formula for the force on a charged particle in a magnetic field to provide a general answer.

The force on a charged particle q moving with velocity v in a magnetic field B is given by the formula:

F = q v B sin(theta)

where theta is the angle between the velocity and the magnetic field.

If the magnitude of the magnetic field is decreasing at a rate of -0.25 t/s, we can write this as:

dB/dt = -0.25 t/s

where dB/dt represents the rate of change of the magnetic field.

To determine the force on q, we need to know the velocity of q and the angle between its velocity and the magnetic field. Without this information, we cannot provide a specific answer.

However, we can say that as the magnitude of the magnetic field decreases, the force on q will also decrease. This is because the magnitude of the force is directly proportional to the magnitude of the magnetic field.

Furthermore, the direction of the force will depend on the direction of the magnetic field and the velocity of q. If q is moving parallel or anti-parallel to the magnetic field, the force will be zero.

If q is moving perpendicular to the magnetic field, the force will be perpendicular to both the velocity and the magnetic field, and its direction will be given by the right-hand rule.

Overall, the answer to this question cannot be determined without more information about the specific scenario.

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To find the average power delivered to the train during its acceleration, we need to use the formula:
Power = Work / Time

First, we need to find the work done on the train during its acceleration. We can use the formula:
Work = Force x distance

The force on the train is equal to its mass times its acceleration:
Force = Mass x Acceleration

Using the given values, we get:
Force = 0.875 kg x (0.720 m/s^2) = 0.63 N

The distance the train travels during its acceleration can be found using the formula:
Distance = (1/2) x Acceleration x Time^2

Plugging in the given values, we get:
Distance = (1/2) x 0.720 m/s^2 x (22.0 x 10^-3 s)^2 = 0.17 m

So the work done on the train during its acceleration is:
Work = 0.63 N x 0.17 m = 0.1071 J

Now we can plug this value into the formula for power:
Power = Work / Time

The time given is 22.0 milliseconds, which is 0.0220 seconds:
Power = 0.1071 J / 0.0220 s = 4.87 W

Therefore, the average power delivered to the train during its acceleration is 4.87 watts.

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Answer:

275000

Explanation:

momentum = mass * velocity

2500*110=275000

T-Bars outside of major construction projects is as supports for a dropped ceiling.

A flat metal plate at the bottom of a ribbed "T"-shaped bar that is driven into the ground. usually used to identify the locations of a water meter pit and chain link fence posts.

Metal bar stock is the same way. Round bar (also known as rod), rectangular bar (including square bar, the exceptional case with equal sides), and hexagonal bar are the three most used shapes (usually called hex bar for short).

Although it might seem out of place at the bar, this metal rail has a useful purpose. A few Reddit users described the purpose of the service bar rail, which separates clients from the area where drinks and employees enter and exit the establishment.

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Answer:

HLW ITS JESS BREGOLI

YOUR ANSWER IS HERE

At different points on Earth's surface, the free fall acceleration ranges from 9.764 m/s2 to 9.834 m/s2[2] depending on altitude and latitude, with a conventional standard value of exactly 9.80665 m/s2 (approximately 32.17405 ft/s2). Locations of significant variation from this value are known as gravity anomalies.

Explanation:

HOPE IT MAY HELP YOU !!

Answer:

Explanation:

mass (m) = 50 kg

Force (F) = 200 N

Acceleration (a)= ?

WE know

F = m * a

200 = 50 * a

a = 200 / 50

a = 4 m/s²

Hope it will help :)

Twisted-pair wiring is a category of cable that is comprised of four copper cables that have been wound around one another and encased in a plastic sheath.

Also with copper wires, twisted-pair cables were some of the first guided transmission medium. Twisted-pair cables are utilized in a variety of networking and communication applications today, including local area networks, digital subscriber lines, and phone lines.

The common copper cable known as twisted pair is used to link residential and commercial systems to the phone provider. Two copper pipe wires are wound around each other in a spirally to minimize electromagnetic induction or crosstalk between pairs of wires. Twisted pair connections require both wires for each connection.

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The steam engine moves a piston back and forth inside a cylinder using the force created by the pressure of the steam. A connecting rod and crank can convert this pushing force into a rotational force for wo

Because electric and diesel locomotives are faster, more effective, and simpler to operate, steam locomotives are no longer utilized to transport people or goods. The locomotives that are still in operation are historical artifacts from the 1800s that serve as a great reminder of how far we've come.

Simply explained, steam engines generate heat energy by boiling water and producing steam using fire and coal (chemical energy). This heat energy is then used to push the cylinder and piston, which in turn moves the wheels (kinetic).

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To include a css file in an html document, you use the link element.

While CSS determines the look and layout of a website, HTML defines its content and organisational structure. Together, the two languages make it possible to build a well-organized, useful website.

The id selector chooses a particular HTML element by using the id property. The id selector is used to choose a single distinct element since each element's id is distinct inside a page. A hash (#) character should be written after the element's id in order to pick it.

There are three techniques to include CSS in HTML documents: Using the style property inside HTML elements is known as "inline." Utilizing a "style" element in the "head" section is one internal method. External – by linking to an external CSS file using the link> element.

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Answer:

Higher percentage of runoff water is absorbed by the vegetation whereas 100 % of water runoff on the roofed area.

Explanation:

Higher percentage of runoff water is absorbed by the vegetation and very little amount of runoff water is received on the end of vegetative cover while on the other hand, 100 percent of precipitation water runoff on the surface of roofed or paved area because no water is absorbed by the roof due to its solid surface. The percentage of runoff depends on the factors such as rainfall intensity, slope, soil water storage capacity, and infiltration rate.

Explanation:

distance = speed x time

a- d= 350 m/s x 30s

   d= 10500m

b- 5 mins = 300 sec

    d= 350 m/s x 300s

    d= 105000 m

c-  30 mins = 1800 sec

    d= 350 m/s x 1800 s

   d=  630000 m

Answer:

Answer

Advantages of alcohol over Mercury

(a) Freezing point of alcohol is −117∘

C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below −80∘

C which cannot be measured by mercury thermometer because mercury freezes at−39 ∘ C

(b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and hence is more sensitive

(c) it can be coloured brightly by adding some dye in it and hence is easily detectable

Therefore, the values of ζ and ωn that will result in the system responding to a step input with approximately 5% overshoot and with a settling time of 2 sec are ζ = 0.24 and ωn = 0.06/s.

The given closed-loop system is characterized by the transfer function C(s)/R(s) = ω2n / (s2 + 2ζωns + ω2n). To determine the values of ζ and ωn such that the system responds to a step input with approximately 5% overshoot and with a settling time of 2 sec, we can use the 2% criterion.

The 2% criterion is based on the equation: ζ2 + ωnT = 0.12, where ζ is the damping ratio, ωn is the undamped natural frequency, and T is the settling time. By setting T = 2s, we can solve for ζ2 = 0.12 - ωn(2s). Since ζ should be greater than 0, the square root of ζ2 must also be greater than 0. Thus, we can solve for ωn = 0.12/2s = 0.06/s.

Given ωn = 0.06/s, we can calculate the damping ratio ζ using the equation: ζ = ζ2 / (2ωn). Plugging in the value of ωn, we get ζ = 0.12 / (2 * 0.06/s) = 0.24.

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Answer:thx

Explanation:

a) The motion of the object between 15 s to 30 s is increasing velocity, to a constant velocity and finally a decreasing velocity.

(b) The average velocity of the object between 0 and 15 seconds is 0.167 m/s.

(c) The position of the object at 5.0 seconds is 0.5 m.

(d) Between 30 and 40 seconds, the velocity of the object is decreasing and the object is decelerating.

(a) The motion of the object between 15 s to 30 s can be described as increasing velocity, to a constant velocity and finally a decreasing velocity.

(b) The average velocity of the object between 0 and 15 seconds is calculated as;

average velocity = total displacement / total time

average velocity = (2.5 m - 0 m ) / ( 15 s - 0 s ) = 0.167 m/s

(c) The position of the object at 5.0 seconds is calculated as follows;

at 5.0 seconds, the position of the object is traced from the graph as 0.5 m.

(d) The motion of the object between 30 and 40 seconds is calculated as;

velocity = ( 0 m - 4 m ) / ( 40 s - 30 s ) = - 0.4 m/s

Between 30 and 40 seconds, the velocity of the object is decreasing and the object is decelerating.

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The final velocity of the handcar, after an object with a mass of 20.0 kg is thrown sideways out of the car with a speed of 1.90 m/s relative to the car's initial velocity, The final velocity of the handcar is 5.47 m/s to the east.

What is Final velocity?

Final velocity refers to the velocity of an object at the end of a particular time interval or motion. It is the velocity of the object at the final or ending point of observation or analysis.

Similar to initial velocity, final velocity is a vector quantity that includes both magnitude and direction. It represents the speed and direction of the object at the conclusion of a specific time or motion.

To solve this problem, we can apply the principle of conservation of momentum. The initial momentum of the system (handcar and object) is equal to the final momentum.

The initial momentum of the system is given by the product of the total mass of the handcar and the initial velocity of the handcar. The total mass of the system is 170 kg, and the initial velocity of the handcar is 5.50 m/s.

The momentum of the object thrown sideways can be calculated by multiplying its mass (20.0 kg) by its speed relative to the initial velocity of the handcar (1.90 m/s). Since the object is thrown sideways, its velocity is perpendicular to the initial velocity of the handcar.

By using the principle of conservation of momentum, we can equate the initial momentum of the system to the final momentum of the system: 170 kg × 5.50 m/s = (170 kg + 20.0 kg) × final velocity

Solving for the final velocity, we find: final velocity = (170 kg × 5.50 m/s) / (170 kg + 20.0 kg) ≈ 5.47 m/s

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Answer:

i don't know lol, why you asking

Answer:

Initial velocity describes how fast an object travels when gravity first applies force on the object. On the other hand, the final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration.

Explanation:

Answer:

1. The speed of the wave is affected by wavelength frequency because waves travel through a medium and sound, ocean waves and seismic waves, etc. are the physical properties of the medium that determines the speed of the mechanical waves.

2. I think the frequency of the wave doesn't have any effect on the wave speed. Only the characteristics of the medium the wave is traveling through determines its speed.

3. As a wave moves from a medium of low density to a higher density the wave speed increases and when a wave moves from a higher density to a medium density the wave speed decreases because the wave length shortens causing the wave speed to lower.

4.If the instrument is initially flat they should tighten it because once it is tightened there is going to be force applied to the gears, and after you've reached the correct pitch the gears won't be able to move. So ultimately, you will be able to meet the intended pitch you were going for.

It is true if the sum of both the external torques and the external forces on an object is zero, then the object must be at rest .

Newton's First Law states that an object with no net forces acting on it which is initially at rest will remain at rest. If it is moving, then it will continue to move in a straight line with constant velocity.

If net external force on a system of particles is zero then the velocity of the center of mass of the system must also be constant. A body is said to be in rest if it does not change its position continuously with respect to surroundings and with the passage of time.

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The 88 sectors into which astronomers today divide the celestial sphere (the whole sky) are called constellations.

A constellation is a group of stars that make an imaginary shape in the night sky.

They are usually named after mythological characters, people, animals and objects

Astronomers divided the entire sky into 88 sectors, or constellations; this international system codifies the naming of stars and star patterns that began in prehistoric times.

Thus, the 88 sectors into which astronomers today divide the celestial sphere (the whole sky) are called constellations.

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The empty water bottle sealed at sea level and taken up to the top of Mt. Everest will bulge and explode due to the decrease in external pressure at higher altitudes.

As the bottle is taken to higher altitudes, the atmospheric pressure decreases. However, the pressure inside the sealed bottle remains relatively constant. The difference in pressure between the inside and outside of the bottle creates a pressure imbalance. The decreasing external pressure causes the air molecules inside the bottle to exert a higher pressure compared to the outside. This pressure difference puts stress on the walls of the bottle, causing it to bulge. Eventually, if the pressure difference becomes too high, the bottle may not be able to withstand the strain and may explode.

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