if a penny is dropped from a height of 100m, how fast would it be going just before it hit the ground ?

Answer:

The answer is 34.67 kilograms force

Explanation:

because

1.Extremely warm masses can lead to heat waves

2.Extremely cold air masses can be just as deadly and costly

3.The"clashing "of different air masses can produce regions of severe weather

Answer: Friction that acts on a sliding object

Explanation:

Answer:

d. water

Explanation:

The energy of a mechanical wave can travel only through matter. The matter through which the wave travels is called the medium (plural, media). The medium in the water wave pictured above is water, a liquid.

HOPE IT HELPS.....

Answer:

Water

Explanation:

i did the test

The meniscus of mercury in a glass tube is convex because: there is a lower attraction of mercury to the glass than to itself.

Surface tension can be defined as a property of liquid such as mercury, which makes its surface to resist an external force due to the cohesive nature of the liquid's molecules.

This ultimately implies that, the surface tension of a mercury is highly dependent on the cohesive forces of attraction existing between its molecules.

In conclusion, a convex meniscus of mercury in a glass tube is due to the effect of high surface tension because it causes the mercury to be more attracted to itself than to the glass, while minimizing (limiting) the total surface area rather than maximizing it.

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Answer:

Formula =   P1V1 = P2V2

                   7.5 x 100000 = p2 X 11

                   750000 / 11 = P2

                      P2 = 68181.81 Pa

                                  or

                            =  68.18181 kPa

Explanation:

An FM radio transmitter has a power output of 170 kW and operates at a frequency of 105.5 MHz. The total number of photons emitted per second by the transmitter will be 0.229* 10³¹.

Given that, power of the transmitter p = 160 kW = 160* 10³ W

Frequency of the transmitter = 105.5 MHz = 105.5* 10⁶ Hz

Number of photons emitted per second is given by the formula,

N = p / h * v = 160* 10³/(6.6* 10⁻³⁴ * 105.5* 10⁶) = 160* 10³¹/(696.3) = 0.229* 10³¹

Thus, the total number of photons emitted by the transmitter will be 0.229* 10³¹.

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Answer:

A vector has magnitude (size) and direction. The length of the line shows its magnitude and the arrowhead points in the direction. We can add two vectors by joining them head-to-tail:

Explanation:

The largest value of the timer can be determined by calculating the maximum decimal value that can be represented using 10 bits. In this case, the largest value of the timer is 1.023 seconds.

A 10-bit timer can represent a maximum decimal value of \(2^1^0\) - 1 = 1023.

Given that each tick of the timer corresponds to one millisecond, the largest value of the timer can be calculated by multiplying the maximum decimal value by the tick duration:

Largest value of timer = Maximum decimal value * Tick duration

= 1023 * 1 ms

= 1023 ms

To convert this to seconds, we divide by 1000:

Largest value of timer = 1023 ms / 1000

= 1.023 seconds

Therefore, the largest value of the timer is 1.023 seconds, so the correct option is d) 1.023 sec.

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Answer:

\(Q=50.3\)

Explanation:

From the question we are told that:

Frequency \(F=330Hz\)

Sound intensity drop \(I_d=2\)

Time \(T=4s\)

Therefore

Sound intensity Ratio

 \(\frac{I}{I_x}=\frac{1}{2}\)

Generally the equation for Sound intensity is mathematically given by

 \(\frac{I}{I_x}=e^{-4\ \=t}\)

 \(\frac{1}{2}=e^{-4\ \=t}\)

 \(\=t =5.8s\)

Generally the equation for Quality Factor is mathematically given by

 \(Q=2 \pi\frac{E}{\triangle E}\)

 \(Q=2 \pi\frac{E}{\frac{E}{2*4}}\)

 \(Q=50.3\)

If the Southern Cross is used to determine that the south celestial pole appears 40 degrees above the horizon, then the observer must be located at 50 degrees south latitude.

The Southern Cross is a well-known constellation visible in the southern hemisphere. It consists of five stars arranged in the form of a cross, with two points pointing toward the pole. The South Celestial Pole, like the North Celestial Pole, is located directly above the Earth's poles. When viewed from the Earth's southern hemisphere, the South Celestial Pole is the point in the sky around which all the stars appear to revolve. It is necessary to determine the altitude of the South Celestial Pole using the Southern Cross constellation to determine the observer's latitude in the southern hemisphere.

Find the Southern Cross constellation. Determine the point where the long axis of the cross intersects with an imaginary line connecting the two stars that make up the cross's short axis. Follow this imaginary line downward until it meets the horizon. The altitude of this point, as measured from the horizon, is equal to the latitude of the observer. In this case, if the observer determines that the South Celestial Pole is 40 degrees above the horizon, the observer's latitude must be 50 degrees south latitude.

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Explanation:

v=?, u=0, a=?, S=22m.

Using the formula, S=ut+½at²

22={0×5}+(½.a.5²)

22=½.a.5²

a=44/25 = 1.76m/s².

Therefore, net force = work done = ma = 48×1.76 = 84.48N.

therefore, power = work done/time = 84.48/5 = 16.896W.

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Answer:

Um, wrong.

Explanation:

The Helioentric model is correct. We orbit the sun. The GEOcentric model is incorrect. The Universe does not orbit the Earth. What are you learning?

When very dense material is heated, it produces a continuous spectrum. A continuous spectrum is an electromagnetic radiation that displays a continuous range of wavelengths or colors.

The spectrum has no gaps or breaks and is seen as a smooth, unbroken band of colors that blend into each other.A continuous spectrum is created by solids, liquids, and dense gases when heated. The molecules in these materials begin to move around more quickly when they absorb thermal energy.

As a result of this motion, the electrons in the atoms within the material are excited to higher energy levels.This means that the electrons move from lower energy levels, which are closer to the atomic nucleus, to higher energy levels, which are further away from the nucleus. When the electrons transition back to their lower energy states, they release energy in the form of electromagnetic radiation.

The radiation that is released includes a continuous range of wavelengths, which produce a continuous spectrum.Continuous spectra are important in astronomy because they help scientists learn about the temperatures of the objects producing the radiation. By analyzing the spectrum, they can determine the temperature of the object.

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A mass on a spring undergoes simple harmonic motion. When the mass passes through the equilibrium position, its instantaneous velocity is maximum.

Simple harmonic motion or SHM is the alternating motion of an object that passes through a certain balance point. SHM has a fixed frequency and amplitude and is periodic, namely movements that occur regularly and are repeated at the same time.

When a spring undergoes simple harmonic motion, the mass accelerates in a direction toward the equilibrium point, then the velocity of the object at the equilibrium point is maximum. The object is accelerating in a direction toward the equilibrium point. Acceleration caused by the force recovered.

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Answer:

don't know the answers sorry

The diagram below shows a portion of the water cycle. Y most likely represent groundwater. Hence option D is correct.

Water that is subsurface and frequently kept in underground aquifers or porous rock formations is referred to as groundwater. Groundwater is an essential component of the water cycle because it may be recharged through processes like infiltration and percolation. Additionally, it is a key supply of water for springs, rivers, and wells.

Although spring, transpiration, and evaporation are other significant elements of the water cycle, groundwater is frequently connected to underground water storage and transportation, making it the most plausible choice for "Y."

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The transfer of momentum increases when the velocity of the marble increases and vice versa.

The transfer of momentum increases when the mass (number of marbles) increases and vice versa.

The momentum of a single marble can be calculated from the product of its mass and velocity.

If two marbles together are moving at the same speed as a single marble, the two marbles will have greater momentum because of their greater mass.

Momentum can be shown as a vector because the direction of the momentum of a body is specified.

The momentum of a body is the product of the mass and the velocity of the body.

Mathematically;

Since the velocity of an object is a vector, the momentum of a body is also a vector.

The momentum of a body is directly proportional to its mass and velocity.

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If a main-sequence star suddenly started burning hydrogen at a faster rate in its core, it would become larger, hotter, and more luminous.

The increase in the rate of hydrogen burning in the star's core would lead to a release of more energy, causing the outer layers of the star to expand and become less dense, which results in an increase in the star's size.

At the same time, the increase in energy production would cause the temperature of the star's core to increase, which would increase the star's overall temperature and luminosity.

Therefore, the star would become larger, hotter, and more luminous, moving away from the main sequence towards the giant branch on the Hertzsprung-Russell diagram.

The increased luminosity and temperature would make the star appear brighter and bluer.

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The characteristics of the vertical throw and Newton's second law allows to find the results for the questions about the motion of the ball with air resistance are:

Kinematics analyzes the movement of bodies looking for relationships between the position, velocity and acceleration of bodies.

Newton's second law relates the net force to the mass and the acceleration of the body.

In this case there is a vertical launch where the ball is launched with an initial velocity and is subjected to an acceleration given by the acceleration of gravity with a vertical downward direction, therefore the speed of the ball must decrease with increasing height.

        v² = v₀² - 2g y

Where v and v₀ are the current and initial velocities, respectively, g the acceleration of gravity and y the height of the body.

In the attached we can see a free body diagram of the ball, the interaction with the earth is constant and is directed towards the center of the earth, in a vertical direction. The friction force of the air is the opposition of the air to the movement of the ball and is directed opposite the direction of movement of the ball. In the case of the ascending ball, the friction force is directed downwards.

Write Newton's second law for upward motion

           -W- fr = m a

           -m g - fr = ma

Therefore, we see that the two forces go in the same direction and therefore the net force increases and the acceleration in the opposite direction of the speed also increases.

At the point of maximum height the speed of the ball is zero, therefore the friction forces of the air is also zero, at this point the acceleration is equal to the acceleration of gravity.

In the case of the ball lowered.  Speed ​​increases as the ball descends.

Newton's second law is.

         -W + fr = ma

        - m g + fr = ma

In this case we see that the forces go in the opposite direction, therefore the net force on the body decreases.

If the friction force with the air increases with the speed, the point where it is equal to the forces of gravity and the acceleration is zero, from this point the ball goes down with constant speed.

In conclusion with the characteristics of the vertical launch and Newton's second law we can find the results for the questions about the motion of the ball with air resistance are:

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e) little cratering, consistent with a young surface.

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False. Stellar nucleosynthesis can account for the existence of hydrogen and helium, which are the two most abundant elements in the universe.

Stellar nucleosynthesis occurs within stars and is responsible for the synthesis of heavier elements through nuclear reactions. The process starts with the fusion of hydrogen nuclei (protons) to form helium, which is the primary source of energy in stars. Subsequent stages of stellar nucleosynthesis involve the fusion of helium and other light elements to produce heavier elements like carbon, oxygen, and beyond. So, while stellar nucleosynthesis plays a crucial role in the synthesis of elements heavier than helium, it is also responsible for the creation of hydrogen and helium in stellar interiors.

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Complete Question:

A student has been assigned to measure the density of an irregularly shaped piece of metal.

Which apparatus would be most appropriate to carry out this task?

Group of answer choices

A. ruler, balance

B. beaker, crucible

C. flask, Bunsen burner

D. graduated cylinder, balance

Answer:

D. graduated cylinder, balance

Explanation:

In this scenario, A student has been assigned to measure the density of an irregularly shaped piece of metal.

The apparatus which would be most appropriate to carry out this task is a graduated cylinder and balance.

A graduated cylinder can be defined as a measuring cylinder used for the measurement of the volume of an irregularly shaped piece of metal or liquids. It is typically marked with horizontal lines on its side as units of measurement for volume. The balance is then used to weigh the metals mass.

Answer:

C. Fe: 24 electrons

Explanation:

From the analogy given, the atom with a charge of +2 is Fe having 24 electrons.

To calculate the charges on an atom;

     Number of charges = Number of protons - Number of electrons.

   O: 10 electrons: 8 protons = 8 - 10 = -2

   N: 10 electrons; 7 protons = 7 - 10 = -3

   Cl: 18 electrons; 17 protons = 17 - 18 = -1

So;

    Fe: 24 electrons and 26 protons = 26 -24  = +2

Therefore, the solution is Fe

A combining form for lungs is  "pneum/o".

In medical terminology, a combining form is a word part that is added to the beginning or end of a root word to modify its meaning. The combining form "pneum/o" is used to refer to the lungs, air, or respiration.

Some common medical terms that use the combining form "pneum/o" include:

Pneumonia: An infection of the lungs that can cause inflammation, coughing, and difficulty breathing.

Pneumothorax: A condition in which air leaks into the space between the lung and chest wall, causing the lung to collapse.

Pneumonectomy: A surgical procedure in which one or more lobes of the lung are removed.

Pneumology: The study of the lungs and respiratory system.

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Thus, simulated freefall is a method of creating zero gravity conditions by allowing a spacecraft to travel in orbit, resulting in a constant state of freefall. During this process, the gravitational pull of the Earth and the centripetal force generated by the spacecraft’s motion are balanced, resulting in a state of weightlessness or zero gravity inside the spacecraft.

Simulated free fall is a process that is used to create zero gravity conditions in space. It is done by allowing a spacecraft to travel in an orbit, which results in a constant state of freefall. The conditions in a spacecraft during a simulated freefall are similar to those in a state of zero gravity. In simulated freefall, the spacecraft moves at a speed that allows it to remain in orbit while constantly falling towards the Earth. During this process, the gravitational pull of the Earth and the centripetal force that is generated by the spacecraft’s motion are balanced. This balance results in a state of weightlessness or zero gravity inside the spacecraft. In addition to being used for research and experimentation, simulated freefall is also used to train astronauts for spaceflight. By creating a zero gravity environment on Earth, astronauts can get a feel for what it will be like to work and live in space. They can practice tasks such as moving around and handling equipment, which are much different in zero gravity than they are on Earth.

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When we convert 4900mm from two-step dimensional analysis it would be 490 cm and 5.59kL to 5923.667 quarts.

Dimensional Analysis is a technique for analysis where physical quantities are expressed in terms of their basic dimensions and is frequently applied when there is insufficient data to create accurate equations.

As given in the problem we have to convert

4900mm to cm

As we know that there  are 1000 mm in 1 m

1000 mm = 1 m

4900 mm = 4.9 m

1 m = 100 cm

4.9 m = 4.9×100

          =490 cm

As we have to convert 5.59kL to quarts

1 Kiloliter =  1056.69 US liquid quart

5.59kL    = 5.59 ×1056.69 quarts

               =5923.667 quarts

Thus, we converted 4900mm to 490 cm and 5.59kL to 5923.667 quarts.

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Answer:

30 cm

Explanation:

0.06 or  \(\frac{1}{15}\)

The lever has two “arms”:

The load arm is the portion of the lever directly connected to the load.

The effort arm is the portion of the lever to which we apply the effort, or input force.

The formula of the mechanical advantage(MA) of a lever is given as

MA = load/effort.

Given,

load = 2kg , effort = 30cm

MA = \(\frac{2}{30}\) = \(\frac{1}{15}\)

MA  = 0.06 cm

Therefore,

A 2-kg mass placed 30-cm to the left of the fulcrum is balanced by a 2-kg mass placed  0.06 cm to the right of the fulcrum.

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