The speed of sound in air is 344 m/s at room temperature. the lowest frequency of a large organ pipe is 30 s−1 and the highest frequency of a piccolo is 1.5×104s−1. part a find the difference in wavelength between these two sounds. express your answer using two significant figures. λ = 11 m
The formula for calculating wavelength ʎ is:
ʎ = s / f
where ʎ is wavelength, s is speed of sound, f is frequency
ʎ (large organ pipe) = (344 m/s) / (30 s-1) = 11.47 m
ʎ (piccolo) = (344 m/s) / (1.5x10^4 s-1) = 0.023 m
So the difference is:
11.47 – 0.023 = 11.45 m
Answer:
11.45 m
The difference in wavelength between the lowest frequency of a large organ pipe and the highest frequency of a piccolo, with the speed of sound at 344 m/s, is approximately 11 m.
Explanation:The question asks to calculate the wavelength difference between the lowest frequency of a large organ pipe and the highest frequency of a piccolo, given the speed of sound in air at room temperature. The speed of sound in air at 21°C is typically around 344 m/s. The frequency for the organ pipe is 30 s⁻¹ (30 Hz), and for the piccolo, it's 1.5×10⁴ s⁻¹ (15,000 Hz). To find the wavelengths, we use the formula λ = v/f, where λ is the wavelength, v is the speed of sound, and f is the frequency. Thus, for the organ pipe, the wavelength is λ = 344 m/s / 30 s⁻¹ = 11.47 m, and for the piccolo, λ = 344 m/s / 1.5×10⁴ s⁻¹ = 0.0229 m. The difference in wavelength, to two significant figures, is about 11 m.
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What type of conducting medium has the highest conductivity?
The de broglie wavelength of an electron is 8.7 Ã 10-11 m. the mass of an electron is 9.1 Ã 10-31 kg. the velocity of this electron is ________ m/s.
A kangaroo jumps to a vertical height of 2.3 m. how long was it in the air before returning to earth?
Short-range forecasts tends to ________ longer-range forecasts.
Short-range forecasts are typically more accurate than longer-range forecasts because they use near future data and can provide detailed specifics about the weather, which is difficult to maintain over a longer time span.
Explanation:In weather forecasting, short-range forecasts usually tend to be more accurate than longer-range forecasts. This is because the short-range forecasts use models that are based on current and near-future atmospheric conditions, which predict the weather for 1 to 3 days. On the other hand, longer-range forecasts predict weather for a period of 3 to 7 days or even up to several months, and although they can give a general pattern of the weather to be expected, they can't provide detailed specifics like short-range forecasts do. Therefore, short-range forecasts are typically more reliable than longer-range forecasts due to the complexities and variabilities involved in predicting atmospheric conditions over a long time span.
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the speedometer in a car does not measure the cars velocity because the velocity is a...
The speedometer in a car does not measure velocity because velocity is a vector quantity, including both speed and direction, and the speedometer only provides information about speed (magnitude). So, the correct option is A, velocity is a vector quantity that includes both speed and direction.
Let's go into more detail:
Velocity:
- Velocity is a vector quantity that includes both speed and direction.
- Speed is the magnitude of velocity, representing how fast an object is moving.
- Direction is a crucial component of velocity; it indicates the path an object is taking.
Speed:
- Speed is a scalar quantity, representing only the magnitude of motion, or how fast an object is moving.
- It does not include information about the direction of motion.
Speedometer in a Car:
- The speedometer in a car measures the instantaneous speed of the vehicle.
- It provides information about how fast the car is moving at a given moment.
- However, the speedometer does not provide any information about the direction in which the car is moving.
- Since velocity includes both speed and direction, and the speedometer only measures speed, it does not directly measure velocity.
Correct Answer (A):
- The correct option is (A) because velocity is indeed a vector quantity, having both magnitude (speed) and direction.
- The speedometer, by measuring speed alone, does not account for the directional component of velocity.
Complete Question: The speedometer in a car does not measure the car's velocity because velocity is a
(A) vector quantity and has a direction associated with it
(B) vector quantity and does not have a direction associated with it
(C) scalar quantity and has a direction associated with it
(D) scalar quantity and does not have a direction associated with it
Kristina works out seven days a week. Lately, she has been tired, and her body aches. If she is overtraining, which training principle should Kristina consider before continuing her program?
a. overload
b. recovery
c. transfer
d. variation
Answer: Option (b) is the correct answer.
Explanation:
As Kristina is over training, therefore, there is pain in her muscles because human body also requires rest in order to work or function properly.
That is why, gym trainers suggest to give one day off in a week for your workout sessions so that body muscles should recover.
Thus, we can conclude that if Kristina is over training, then recovery training principle should Kristina consider before continuing her program.
Answer:
B
Explanation:
Which of the following gives an atom's mass number? Question 1 options: a.number of neutrons b.number of neutrons + number of protons c.number of protons + number of electrons d.number of protons + number of neutrons + number of electrons Save
What other professions does a fire sprinkler contractor work with? *?
64) Compare skeletal, smooth, and cardiac muscles as to their body location, microscopic anatomy, regulation of contraction, speed of contraction, and rhythmicity.
65) What is the effect of aging on skeletal muscles?
66) Discuss the role of the myosin heads in sliding filament theory.
mercury is 0.39 AU from the sun what is its distance from the sun in kilometers
Answer:The distance of Mercury from the Sun in kilometer is [tex]5.8344\times 10^7 km[/tex].
Explanation;
Distance between the Mercury and Sun = 0.39 AU
1 AU = [tex]1.496\times 10^8 km[/tex]
So, 0.39 AU = [tex]0.39\times 1.496\times 10^8 km=5.8344\times 10^7 km[/tex]
The distance of Mercury from the Sun in kilometer is [tex]5.8344\times 10^7 km[/tex].
A train rolls past a stationary observer. To him, the train is moving at a speed of 23 m/s west, and a woman on the train is moving at a speed of 22.4 m/s west. How long does it take the woman to move 13 m relative to the train?
Answer:
21.7 seconds
Explanation:
Two boys (same height) are standing on a bridge each boy throws a rock straight down into the river below. they throw the rock at the same time, but one rock hits the water before the other one. how is this possible? g
A karate expert breaks a stack of bricks with his bare hand. If the force applied is 520 newtons and the impact time is 5.0 × 10-4 seconds, what is the value of impulse?
Final answer:
The impulse delivered by the karate expert's hand to the stack of bricks is 2.6 × 102 N·s, which can be calculated using the force of 520 newtons multiplied by the impact time of 5.0 × 10-4 seconds.
Explanation:
The student is asking about the concept of impulse in physics. The impulse experienced by an object is the product of the average force applied to the object and the time interval over which it is applied. According to the given information:
Force (F) = 520 newtonsImpact time (t) = 5.0 × 10-4 secondsThe impulse (J) can be calculated using the formula:
J = F × t
By substituting the given values:
J = 520 N × 5.0 × 10-4 s = 0.26 kg·m/s
To express it in scientific notation, we can write it as 2.6 × 102 N·s (Newtons second), which is the value of the impulse delivered by the karate expert's hand to the stack of bricks.
A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 15.5 m before hitting the ground. from what height was the rock thrown? use the value g = 9.800 m/s2 for the free-fall acceleration.
The initial height of the rock can be calculated using the principles of projectile motion. First, we find the time the rock was in the air by using the horizontal motion, and then apply this time to the vertical motion taking gravity into account.
Explanation:Using the principles of projectile motion, the objective is to find the initial height from which the rock was thrown. The first step on this process is to determine the time the rock was in the air. We know that the range (horizontal distance) d is given by the equation d=v*t*cos(θ), where v is the initial speed, t is the time the rock is in the air, and θ is the launch angle. Rearranging for time gives us t=d/(v*cos(θ)).
The next step is to apply this time to the vertical motion. The vertical motion is affected by gravity, and the displacement h is given by the equation h=vi*t - 0.5*g*t², where vi is the initial vertical speed, which is given by v*sin(θ), and g is the acceleration due to gravity. As the rock is hitting the ground, h will be negative. Substituting all the known values will give us the initial height the rock was thrown from.
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What is the force of attraction between cations and anions?
Final answer:
The force of attraction between cations and anions is electrostatic attraction, which is fundamental to the formation of ionic bonds. The strength of this force depends on the charges of the ions and the distance between them, with stronger forces resulting from higher charges or shorter distances. The arrangement of ions in a crystal structure and the Madelung constant also play roles in the bond strength.
Explanation:
The force of attraction between cations and anions is known as electrostatic attraction. This is the principle underlying ionic bonds, which form when electrons are transferred from one atom to another, leading to the creation of oppositely charged ions that are held together by this force. According to Coulomb's law, the strength of the electrostatic force between two ions is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
A cation with a greater positive charge will form a stronger bond than one with a lesser charge. Conversely, larger ions result in weaker bonds due to the increased distance between the electrons of one ion and the nucleus of the other. Additionally, the orientation of ions in a crystal lattice affects the attractive forces. Salts such as NaF and NaCl are classic examples, where ions arrange themselves in a way to maximize attractive interactions and minimize repulsive ones.
The Madelung constant also influences the bond strength and depends on the type of crystal structure. The potential energy of an ionic bond can be quantitatively expressed using the formula involving Avogadro's number, Madelung constant, ion charges, the charge of an electron, and the ion radius.
What is the chemical name of SiF4
The automobile is originally at rest s = 0. if it then starts to increase its speed at v # = (0.05t 2) ft>s2, where t is in seconds, determine the magnitudes of its velocity and acceleration at s = 550 ft.
The velocity of the car at s = 550 ft is 2,904,166.67 ft/s and the acceleration at s = 550 ft is 1512.5 ft/s^2.
Explanation:The velocity of the car can be determined by finding the integral of the acceleration function with respect to time. In this case, the acceleration function is v' = 0.05t^2. Integrating this function gives the velocity function v = (0.05/3)t^3 + C, where C is the constant of integration. To find the value of C, we can use the fact that the car is originally at rest, so v(0) = 0. Plugging in the values, we get C = 0, so the velocity function is v = (0.05/3)t^3.
To find the magnitude of the velocity at t = 550 ft, we can plug in the value of t into the velocity function. So, v = (0.05/3)(550)^3 = 2,904,166.67 ft/s. Therefore, the magnitude of the velocity at s = 550 ft is 2,904,166.67 ft/s.
The acceleration can be determined by taking the derivative of the velocity function with respect to time. In this case, the velocity function is v = (0.05/3)t^3. Taking the derivative, we get a = (0.05)t^2. Plugging in the value of t = 550 ft, we get a = (0.05)(550)^2 = 1512.5 ft/s^2. Therefore, the magnitude of the acceleration at s = 550 ft is 1512.5 ft/s^2.
A person who climbs up something (e.g., a hill, a ladder, the stairs) from the ground gains potential energy. a person's weight (f = mg) is usually measured in pounds. for conversions, you may need to know that the weight of 1 pound is equal to 4.448 newtons. part a how many meters above the ground would a 240 lb person have to climb to gain 3 kilojoules (3000 joules) of potential energy?
We are given the following values:
weight w = 240 lb = 1,067.52 N
energy E = 3,000 J
The formula for potential energy is:
E = w h
where h is the height the person has to climb, therefore:
h = 3000 / 1067.52
h = 2.81 m
Therefore he has to climb 2.81 meters
If a photon has a frequency of 5.20 x 10^14 hertz, what is the energy of the photon ?
Given : Planck's constant is 6.63 x 10^-34 joule-seconds.
The energy of a photon with a frequency of 5.20 x 10^14 Hz is calculated using the equation E = hf, which results in an energy of 3.448 x 10^-19 joules.
Explanation:To calculate the energy of a photon with a specific frequency, we use the following equation:
E = hf
Here, E represents the energy of the photon in joules, h is Planck's constant, and f is the frequency of the photon given in hertz (Hz). With the values provided in the question, we get:
E = (6.63 × 10^-34 J·s) × (5.20 × 10^14 Hz)
Calculating the above expression leads to:
E = 3.448 × 10^-19 joules
Therefore, the energy of the photon with a frequency of 5.20 × 10^14 hertz is 3.448 × 10^-19 joules.
A car speeds up from 5 m/s to 12 m/s in 20 seconds. What is the acceleration of the car?
Answer:
0.35 m/s^2 or 0.35 m/s squared
Explanation:
In a video game, a ball moving at 0.6 meter/second collides with a wall. After the collision, the velocity of the ball changed to -0.4 meter/second. The collision takes 0.2 seconds to occur. What’s the acceleration of the ball during the collision? Use .
When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. calculate the force she must exert if her deceleration is 7 times the acceleration of gravity?
Final answer:
To calculate the force a 40.0-kg gymnast must exert to decelerate at 7 times the acceleration due to gravity, we use Newton's second law (F = ma) and find that she must exert approximately 2746.8 N.
Explanation:
Calculating the Force Exerted by a Gymnast
When a 40.0-kg gymnast lands and decelerates, she must exert a force to counteract the force of deceleration. To calculate the force she must exert if her deceleration is 7.00 times the acceleration due to gravity, we use Newton's second law of motion, which can be expressed as F = ma, where F is the force, m is the mass of the object, and a is the acceleration. First, we note that the acceleration due to gravity (g) is approximately 9.81 m/s². The deceleration she experiences would thus be 7 times 9.81 m/s², or approximately 68.67 m/s².
To calculate the total force, we multiply the gymnast's mass by the deceleration:
Force exerted (F) = Mass (m) × Deceleration (a)
F = 40.0 kg × 68.67 m/s²
F = 2746.8 N
Therefore, the gymnast must exert a force of approximately 2746.8 N by pushing down on the mat to achieve this deceleration.
Which of the following is not true about chemical changes? a. They form a new substance. b. They can be reversed by physical changes. c. They can be detected by changes such as color. d. They have different properties from their starting materials. Please select the best answer from the choices provided
Answer : The incorrect option is (b) They can be reversed by physical changes.
Explanation :
Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is an irreversible reaction.
The indication of chemical changes are :
Formation of gas bubbles.
Formation of precipitate.
Change in color.
Change in temperature.
Change in volume.
Change in smell or taste.
Evolution of heat, light and sound.
Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is a reversible reaction.
The indication of chemical changes are :
Change in shape.
Change in form.
Change in size.
Change in phase.
From the given options we conclude that the option (b) is incorrect option while all the options are correct for chemical changes.
Hence, the incorrect option is (b)
which of the following statement best describes the laws of conservation mass?
Mass is neither created or destroyed.
A Honda Civic Hybrid weighs about 3200 lb .
Part A
Calculate the weight of the car in newtons. (Note: 0.22 lb =1N).
Answer:
14545 .45 N
Explanation:
The weight of given car is 3200 lb.
0.22 lb = 1 N (Given)
[tex]1 = \frac{1}{0.22}N/lb[/tex]
Therefore, the weight of the car in N can be calculated as follows:
[tex]3200 lb =3200 lb\times \frac{1}{0.22}N/lb=14545 .45 N[/tex]
Two ice skaters stand at rest in the center of an ice rink. when they push off against one another the 45-kg skater acquires a speed of 0.62 m/s. if the speed of the other skater is 0.89 m/s, what is this skater's mass?
Answer:
mass of other skater is 31.3 kg
Explanation:
Here since we know that two skaters push each other so if we consider two skaters as system then there is no external force on the system.
hence we can say that momentum of the system is conserved
so here we have
[tex]P_i = P_f[/tex]
now we can say that initially both skaters are at rest so initial total momentum is ZERO for both
now we have
[tex]0 = m_1v_{1i} + m_2v_{2i}[/tex]
[tex]0 = 45(0.62) + m_2(-0.89)[/tex]
[tex]m_2 = 31.3 kg[/tex]
Based on the information given, the mass of the other skater will be 31.3 kg.
How to calculate the mass.From the information given, ice skaters stand at rest in the center of an ice rink. when they push off against one another the 45-kg skater acquires a speed of 0.62 m/s and the speed of the other skater is 0.89 m/s.
Therefore, the mass of the skater will be:
0 = 45(0.62) + (-0.89)m
m = 31.3kg
In conclusion, the correct option is 31.3kg.
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At what point in the swing of the pendulum is the potential energy completely converted into Kinetic energy
If it requires 7.0 j of work to stretch a particular spring by 2.1 cm from its equilibrium length, how much more work will be required to stretch it an additional 3.5 cm ?
What evidence is there from your results that the characteristic color observed for each compound is due to the metal ion in each case? describe an additional test that could be done to confirm that the color is due to the metal ion?
The color in metal compounds is primarily due to the metal ion and how it interacts with light. This is evident in emission spectra and color patterns seen in flame tests. A flame test can specifically prove this by displaying characteristic colors for each metal ion.
Explanation:The color observed in metal compounds is often due to the metal ion involved in the compound - a phenomenon made apparent by changes in the relative energies of the electron orbitals. To illustrate, compounds of a variety of metals (including alkaline earth metals like calcium and strontium) produce different colors when exposed to flame - a feature of their emission spectrum. Furthermore, the color of coordination compounds, like the iron(II) complex [Fe(H₂O)6]SO4 that appears blue-green, depends on the specific ligands coordinated to the metal center, which influences the absorption of light.
A simple test to confirm that the color is due to the metal ion is to perform flame tests on the compounds. This test involves introducing the compound to a flame and observing the color of the flame. Each metal ion can produce a characteristic flame color; hence the flame test serves to confirm the presence of a specific metal ion in a compound.
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