The string on a piano that produces an A sharp vibrates with a frequency of 235 Hz.
If the sound waves produced by this string have a wavelength in air of 1.49 meters,
What is the temperature?

Answer:

A. The magnets used to lift metal or cars in a salvage/junk yard

Explanation:

An electromagnet  is defined as a type of magnet which are made up of wires in coil shape. Magnetic field in these wires are produced by electric current.

An example of an electromagnet is magnets used to lift metal or cars in a salvage/junk yard because a crane is used in junkyard to lift metal in which crane is attached to a iron disc and when electricity is off, the disc move downwards and placed near required metal and switch on the electricity when disc reaches on metal or cars to be lifted. This electricity generates magnetism in the iron disc and attract metal or cars from the junkyard.

Hence, the correct answer is "A. The magnets used to lift metal or cars in a salvage/junk yard".

Answer: A satellite with a mass of 110 kg and a kinetic energy of 3.08×10^9 J must be moving at a speed of 7483 m/s.

Explanation: To find the answer we need to know about the kinetic energy of a body.

                                   \(KE=\frac{1}{2}mv^2\)

                                   \(m=110kg\\KE=3.08*10^9J\\\)

                               \(v=\sqrt{\frac{2KE}{m} } =\sqrt{\frac{2*3.08*10^9}{110} } =7.483*10^3 m/s\)

Thus, we can conclude that, the velocity of the satellite will be 7438m/s.

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In order to move at a speed of 7483 m/s, a satellite with a mass of 110 kg and a kinetic energy of 3.08× 10^-9 J must be travelling.

Understanding a body's kinetic energy is necessary in order to determine the solution.

                         \(KE=\frac{1}{2}mV^2\)

               \(m=110kg\\KE=3.08*10^9J\)

                        \(V=\sqrt{\frac{2KE}{m} }=7.48km/s\)

Thus, we can infer that the satellite will move at a speed of 7438 m/s.

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Answer:

255 .07N

Explanation:

F_l * d_l = F_r * d_r

F_l * 0.722 = 1250 * 0.13

F_l = 255.07

Explanation:

Find an energy is E=mgh, so E=18*10*10=1800J

The kinetic energy of the baseball be 63 joule.

The player had to work of 63 joule on the ball to give it this energy.

According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.

As a scalar quantity, kinetic energy can only be fully defined by its magnitude.

Given that:

Mass of the baseball: m = 0.14 kg.

Speed of the baseball: v = 30 m/s.

So, kinetic energy of the baseball= 1/2×0.14×30² joule = 63 joule.

Hence, the player  had to work of 63 joule on the ball to give it this energy.

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The sum of the formal charges of the atoms in a molecule or polyatomic ion must equal the overall charge of the species. Formal charge is a way of keeping track of the distribution of electrons in a molecule or ion.

It is calculated by subtracting the number of electrons assigned to an atom in a molecule from the number of valence electrons of that atom in the neutral state. For a neutral molecule, the sum of the formal charges of all the atoms should be zero. For a polyatomic ion with a positive or negative charge, the sum of the formal charges of all the atoms should be equal to the overall charge of the ion. This is a useful tool for determining the most likely arrangement of atoms in a molecule or ion, and for predicting the polarity of a molecule.

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Answer:

Atoms

Explanation:

An atom is the smallest particle of an element that still has the properties of that element

Answer:

\( \huge{ \boxed{ \bold{ \sf{Atom}}}}\)

✎ Let's explore about Atoms :

⟶ The smallest particle of an element which takes part in a chemical reaction without its division is called an atom. All the atoms of an element are the same. The atoms of different elements are different. All the atoms of iron in an iron nail are the same. But the atoms of iron are different from the atoms of copper. All the atoms of elements except hydrogen are made up of electron , proton and neutron. A hydrogen atom is made up of only electron and proton. Most of the atoms of elements do not exit independently except the atoms of inert gases like helium , neon , krypton etc.

____________

✑ EXTRA INFO :

STRUCTURE OF THE ATOM :

⟶ According to scientists , an atom is a sphere with a diameter of approximately \( \sf{ {10}^{ - 10}} \) m. In the \( \sf{ {19}^{th} }\) century , it was found that there are other smaller particles in an atom. These smaller particles are called subatomic or elementary or fundamental particles. The main subatomic particles are electrons , protons and neutrons. Among three subatomic particles of an atom , protons and neutrons are located at the centre of the atom called nucleus. The nucleus shows the positive charge due to the positive charge of protons. It also helps to find atomic weights . Electrons are revolving around the nucleus in their respective orbits or shells. The number of electrons present in an atom determines the size of the atom as it occupies more space as compared to the nucleus. In any atom , the number of negatively charged electrons in the orbits is equal to the number of positively charged protons in the nucleus. So, An atom is electrically neutral.

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The property of a transverse wave that stays the same even as the wave's energy and other properties change is the wavelength.

The correct option to the given question is option a.

The wavelength is the distance between two successive points of the wave that are in phase. As the wave's energy and amplitude change, the distance between two successive points of the wave that are in phase remains the same.

This is because wavelength is determined by the frequency of the wave and the speed of propagation. The frequency of the wave is the number of cycles of the wave that occur in one second, while the speed of propagation is the rate at which the wave travels through a medium.

If the frequency of the wave and the speed of propagation remain the same, then the wavelength will also remain the same even as the wave's energy and other properties change. This property is known as the characteristic of the wave.The amplitude is the maximum displacement of a point on the wave from its rest position. The frequency is the number of cycles of the wave that occur in one second. The rest position is the position of the medium when it is not disturbed.

Hence, wavelength of a transverse wave remains same even as the wave's energy and other properties change.

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Answer:

70 mi/hr

Explanation:

70 mi/hr is a magnitude.....already

Answer:

they may not be accurate - climate models are hugely complex in terms of numbers of factors involved in atmospheric systems, accuracy is lost in the process of oversimplification.

they rely on the expertise of the people making them.

different people may interpret them in different ways.

hope it helps u..........

The magnetic field of a solenoid is analogous to the electric field of a charged parallel-plate capacitor.

A solenoid is a long coil of wire wound tightly in the form of a cylinder. When an electric current flows through the solenoid, a magnetic field is generated inside it. This magnetic field is similar to the electric field that exists between the plates of a charged parallel-plate capacitor.

In both cases, the field lines are uniformly distributed and run parallel to each other. The strength of the field is proportional to the current for a solenoid and the charge for a capacitor.

Additionally, the magnetic field of a solenoid is similar to the electric field of a capacitor because they both exhibit a directional property, creating a preferred direction for the field lines.

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Answer: True

Explanation:

It should be noted that when refrigerant is added in vapor form to the operating refrigeration system, then the addition of the refrigerant should be to the low-pressure side of the refrigeration system.

Furthermore, when system pressures are lower than the pressure in the refrigerant tank as stated in the question, then the refrigerant can be added to both the high and low pressure sides of the system.

Therefore, the correct option is true.

Answer:

mass

Explanation:

Answer:

v = 6.25 m/s

Explanation:

Given that,

A man runs 650 m east and then turns and runs 850 m west. This takes him 240 seconds.

Let east is positive and west is negative

Average velocity = total displacement/total time taken

Total displacement = final psoition - initial position

D = -850 - 650 = -1500 m

So,

\(v=\dfrac{-1500\ m}{240\ s}\\\\v=-6.25\ m/s\)

So, 6.25 m/s is the average velocity of the man.

Answer:

The answer is Mass

Explanation:

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Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

When a jet of air issues from the nozzle with a velocity of 349 ft/sec at the rate of 5.54 ft³/sec and is deflected by the right-angle vane, the force required to hold the vane in a fixed position can be determined using the principle of linear momentum.

Given, Velocity of air, V = 349 ft/s

Volume of air, Q = 5.54 ft³/s

Density of air, ρ = 0.07530 lb/ft³

Consider the flow of air before and after it strikes the vane as shown in the diagram below. Before striking the vane, the mass of air that flows per second is:Mass = Density * Volume = ρQ = 0.07530 * 5.54 = 0.417 lb/similarly, the mass of air after striking the vane is:

Mass = Density * Volume = ρQ = 0.07530 * 5.54 = 0.417 lb

From the principle of linear momentum, the rate of change of momentum of the air before striking the vane is equal to the rate of change of momentum of the air after striking the vane.

Mathematically,Force = (Mass flow rate) x (Exit velocity - Inlet velocity)

F = Mass x (Vf - Vi)Where F is the force required to hold the vane in a fixed position, Vf is the exit velocity and Vi is the inlet velocity.

Substituting the given values of mass, inlet and exit velocities in the above formula,Force = 0.417 * (0 - 349)Force = -145.93 lbHence, the force required to hold the vane in a fixed position is -145.93 lb. The negative sign indicates that the force is acting in the opposite direction of the jet of air.

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Ernest rutherford was a prominent scientist who contributed significantly to the theory of atomic structure.  Yes, the following statement is true.

Ernest Rutherford is considered one of the greatest scientists and experimentalists who worked on the atomic model and is also known for his contribution to nuclear physics.

he discovered that an atom is composed of three fundamental particles i.e. electrons, protons, and neutrons.

Most of the spaces are empty in an atom while its all mass is confined in a dense positively charged area called the nucleus.

Moreover, he also discovered alpha and beta radiations emitting from uranium.

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A lahar is a type of mudflow or debris flow that occurs on the slopes of a volcano, often triggered by volcanic activity or heavy rainfall. It is characterized by a mixture of volcanic ash, rock fragments, and water, resembling a fast-moving slurry.

The event that is essential to the formation of a lahar is Melting of snow.Volcanic regions often have glaciers or permanent snowfields on the slopes of the volcanoes. When a volcanic eruption or intense heat from volcanic activity melts the snow, large amounts of water are introduced to the volcanic debris and ash present on the slopes.This sudden influx of water combines with loose volcanic materials, such as ash, pumice, and rocks, creating a highly fluid mixture that can rapidly move down the volcano's slopes. The melted snow acts as a lubricant, facilitating the flow of the debris down the valleys and channels, often with destructive force.

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It is not clear how many decimal places were used to measure the mass of each square of aluminum as the question doesn't provide that information.

Additionally, it's not possible to determine which places were exact and which were estimated without knowing the measurement itself. Decimal places refer to the number of digits to the right of the decimal point when measuring a quantity. The precision of a measurement is determined by the number of decimal places used. For example, if a measurement is recorded to the nearest hundredth, it has two decimal places. If a measurement is recorded to the nearest thousandth, it has three decimal places.

Exact numbers are numbers that are known with complete accuracy. They are often defined quantities, such as the number of inches in a foot or the number of seconds in a minute. When using a measuring device, the last digit of the measurement is usually an estimate, as there is some uncertainty associated with the measurement. Therefore, it is important to record which digits are exact and which are estimated when reporting a measurement.

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Physical properties are used to identify and describe matter. They include

Answer:

Astronauts who are orbiting the Earth often experience sensations of weightlessness. These sensations experienced by orbiting astronauts are the same sensations experienced by anyone who has been temporarily suspended above the seat on an amusement park ride. Not only are the sensations the same (for astronauts and roller coaster riders), but the causes of those sensations of weightlessness are also the same. Unfortunately however, many people have difficulty understanding the causes of weightlessness.

Answer:

Power required = 3.5E8 * 9.0E4 = 3.2E13     (watts)

Power supplied = 1.5E3 * .15 * 3600 * 6    (watts / m^2) * A

= 1.5E3* .15 * 3600 * 6 = 4.9E6 * A

A = 3.2 / 4.9 * E7 = 3.2 / 4.9 * 10 = 6.5 km*2    (1 km^2 = 10E6 m^2)

Note:  1 W = 1 J / sec    1 kw = 1000 W

The area needed to satisfy US energy needs using solar cells 6.5 km²

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

Power required = 3.5E8 * 9.0E4 = 3.2E13     (watts)

Power supplied = 1.5E3 * .15 * 3600 * 6    (watts / m^2) * A

= 1.5E3* .15 * 3600 * 6 = 4.9E6 * A

A = 3.2 / 4.9 * E7 = 3.2 / 4.9 * 10

= 6.5 km*2  

The area needed to satisfy US energy needs using solar cells 6.5 km².

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The type of remote sensing which penetrates clouds at night for accurate terrain representation is radar.

Radar uses radio waves to detect objects and their properties, and can penetrate clouds and other obstacles that might obscure the view.

By bouncing radio waves off of the surface and measuring the time it takes for them to return, radar can create accurate representations of terrain and objects, including those hidden from view by clouds or darkness.

This makes radar an invaluable tool for a wide range of applications, including military, meteorological, and scientific uses.

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Answer:

सं देश भर भर में नौ महिना अघिदेखि महिना अघिदेखि नै जातीय आधारमा प्रान्त पुगें र नेपाली जनताको लागि फरक छ तर त्यो पनि पाँचै वर्षमा धरासायी भयो पाँचै वर्षमा धरासायी भयो भने हेर्न त्यो पनि हो र स्वार्थी हुन्छ भन्थे यो मेरो पहिलो मृत्यु भएको हो। छ। यो म भने त्यो प्रेम कति

Harrison is incorrect because particles can force each other to vibrate more easily in elastic materials where particles are closer together. So, option A.

Vibration is a periodic back-and-forth motion of the particles in an elastic body or medium.

Here,

Vibrations occurs when practically any physical system is moved out of its equilibrium condition and is left to react to forces that work to bring it back into equilibrium.

A periodic shift in time is referred to as a vibration. A wave is a regular oscillation in both space and time. The waves propagate from one point to another in a medium.

Most waves travel through different media, and this affects how fast they move.

In general, waves go through solids the quickest and gases the slowest. The reason for this is that while particles in a gas are farthest to one another, those in a solid are closer to one another.

Hence,

Harrison is incorrect because particles can force each other to vibrate more easily in elastic materials where particles are closer together. So, option A.

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Given:

The initial velocity is

The initial position is x1 = 2.76 cm

The final position is x2 = - 5 cm

The time will be t = 2.25 s

To find the acceleration.

Explanation:

The acceleration can be calculated by the formula

Here, the displacement is

On substituting the values, the acceleration will be

Final Answer: The acceleration is -12.84 cm/s^2

Answer:

There would be tremendous earthquakes and tsunamis, followed by massive volcanism around the impact zone. The ozone layer would be destroyed. The oceans would turn acidic. The Sun would be blotted out, probably for decades.              

Explanation:

    Hope this helps!

Answer: Well it depends on the size. If the asteroid was the size of a basketball, it would most probably turn to dust by the time it reaches the surface. But, if it was the size of Australia, then most probably everyone would die.

Explanation:

Answer:

a) Direction, direction

A 15 kg flywheel has all its mass around its outer rim. A string is wrapped around it and a m = 3.7 kg weight is hanging on the string. The flywheel has radius R = 0.25 m.

a) When the 3.7 kg weight is dropping with a speed of 1.7 m/s,  the angular velocity of the flywheel 6.8 rad/s.

b) When the 3.7 kg weight is moving with a speed of 1.7 m/s,  the kinetic energy of the entire system is 22.5 J.

c) If the system started from rest, the height weight fallen is 0.719 m

d)  the angular acceleration at this point is 39.2 rad/s².

a) Angular velocity of the flywheel is given by :

w = v / r

Where, w = angular velocity of flywheel v = velocity of weight R = radius of flywheel

Therefore,w = v / r = 1.7 m/s / 0.25 m = 6.8 rad/s

Therefore, the angular velocity of the flywheel is 6.8 rad/s.

b) Kinetic energy of the entire system is given by :

K.E. = 1/2 * I * w²

Where, I = moment of inertia = mass of the flywheel * radius²

Thus,I = 15 kg * (0.25 m)²I = 0.9375 kg.m²

Therefore, K.E. = 1/2 * I * w²= 1/2 * 0.9375 kg.m² * (6.8 rad/s)²= 22.5 J

Therefore, the kinetic energy of the entire system is 22.5 J.

c) Potential energy of the weight at the top of the wheel is given by:

U = mgh

Where, m = mass of the weight = 3.7 kg g = acceleration due to gravity = 9.8 m/s² h = height fallen

Thus,U = 3.7 kg * 9.8 m/s² * h

Therefore, h = U / (mg) = (1.7 * 3.7 * 9.8) / (15 * 9.8)= 0.719 m

Therefore, the height fallen by the weight is 0.719 m

d) At this point, angular acceleration is given by:

a = alpha * r

Where, alpha = angular acceleration of flywheel

Therefore, alpha = a / r = g / r= 9.8 m/s² / 0.25 m= 39.2 rad/s²

Therefore, the angular acceleration at this point is 39.2 rad/s².

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