The number of revolutions the spinning disc makes during the given time is 34 revolutions .
To find the number of revolutions the spinning disc makes during the given time, we need to first find the average angular velocity and then multiply it by the time.
Step 1: Calculate the initial angular velocity (ω₁).
Given that the spinning disc rotates at 130 revolutions per minute (rev/min), we first convert it to revolutions per second (rev/s) by dividing by 60:
ω₁ = 130 rev/min / 60 = 2.167 rev/s
Step 2: Calculate the final angular velocity (ω₂).
Since the disc stops, its final angular velocity is 0 rev/s.
Step 3: Calculate the average angular velocity (ω_avg).
The average angular velocity is the mean of the initial and final angular velocities:
ω_avg = (ω₁ + ω₂) / 2 = (2.167 + 0) / 2 = 1.0835 rev/s
Step 4: Multiply the average angular velocity by time to find the number of revolutions.
The given time is 31 seconds:
Number of revolutions = ω_avg × time = 1.0835 rev/s × 31 s ≈ 33.6 revolutions
The closest answer among the given choices is A) 34.
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A painter of mass 80 kg climbs 3.0 m up a ladder. The painter's potential energy has increased by
The potential energy of the painting has increased by 2354.4 J.
The potential energy of an object depends on its position and mass. In this case, the painter has climbed 3.0 m up a ladder, which means the painter's potential energy has increased.
The potential energy gained by the painter can be calculated using the formula PE = mgh, where PE is potential energy, m is the mass of the painter, g is the acceleration due to gravity (9.81 m/s²), and h is the height climbed.
Therefore, the potential energy gained by the painter can be calculated as follows:
PE = mgh
PE = (80 kg)(9.81 m/s²)(3.0 m)
PE = 2354.4 J
The painter's potential energy has increased by 2354.4 J.
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When J. J. Thomson discovered the electron, what physical property of the electron didhe measure?A) its charge, e D) its mass, mB) its charge-to-mass ratio, e/m E) its atomic number, ZC) its temperature, T
When J.J. Thomson discovered the electron, the physical property he measured was B) its charge-to-mass ratio, e/m.
He did this by conducting experiments using a cathode ray tube, which allowed him to observe the behavior of electrons in the presence of electric and magnetic fields. By analyzing the deflection of the electron beam, Thomson was able to determine the charge-to-mass ratio of the electron.This ratio was determined through experiments involving the discharge of electricity through a vacuum tube, the deflection of cathode rays by electric and magnetic fields, and the measurement of the radius of the cathode rays. From these experiments, Thomson was able to calculate the charge-to-mass ratio of the electron.
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List three uses of the rare earth metal neodymium.
Neodymium is a key component of the powerful magnets used in many everyday products. Neodymium oxide can be used as a glass colorant to create a range of hues. Neodymium compounds are used as catalysts in a variety of industrial processes
Neodymium is a versatile rare earth metal with various applications. Three uses of neodymium are:
1. Magnets: Neodymium is used to create strong permanent magnets, known as neodymium-iron-boron (NdFeB) magnets. These magnets are commonly found in electric motors, generators, headphones, and hard disk drives.
2. Glass: Neodymium is used as a colorant in glass to produce specific shades, particularly in sunglasses and camera lenses. It also helps reduce glare and enhance contrast in optical devices.
3. Catalysts: Neodymium acts as a catalyst in certain chemical reactions, particularly in the petroleum industry for refining crude oil and producing synthetic fuels.
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During a clear, relatively calm day, the relative humidity will tend to ________ from sunrise to early afternoon.
During a clear, relatively calm day, the relative humidity will tend to decrease from sunrise to early afternoon.
During a clear, relatively calm day, several factors can contribute to a decrease in relative humidity from sunrise to early afternoon:
Increase in temperature: As the day progresses from sunrise to early afternoon, the temperature usually rises due to the sun's heat. Warmer air can hold more moisture, so as the temperature increases, the air has a higher capacity to hold water vapor, resulting in a decrease in relative humidity.Evaporation: During the day, the warmth from the sun can cause surface moisture, such as dew or water on leaves or the ground, to evaporate. As the moisture evaporates into the air, it increases the water vapor content in the air, which can lead to a decrease in relative humidity.Mixing of air: During the early hours of the day, the air near the ground is usually cooler and has higher relative humidity due to factors such as dew formation or overnight moisture. However, as the day progresses, the air near the ground and the upper atmosphere tend to mix due to atmospheric processes, leading to a decrease in relative humidity as the moisture gets distributed throughout the atmosphere.These factors combined can lead to a decrease in relative humidity from sunrise to early afternoon during clear, relatively calm days. However, it's important to note that local weather patterns, geography, and other factors can affect relative humidity, and it may not always follow this general trend.
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2. The moon was not a graceful orb but a misshapen circle. No stars were visible. It spooked
Heidi that the moon was so clear and the stars so missing. Even as she looked out, the sky
around the moon darkened threateningly. It did not seem cold enough for snow. They would
have one of those grim, depressing, icy rains.
The sky was _____
A) mysterious
B) sparkling
C) smoky
D) peaceful
Answer:
a c
Explanation:
Question 6
Which one of the following sources of noise has been declining slightly in recent years?
a. motorcycle
b. automobile
c. aircraft
d. industrial
the source of noise that has been declining slightly in recent years is the automobile. This is due to the implementation of noise regulations and the development of more efficient and quieter engines.
Answer - 1. Technical evolution of motor vehicles and progress in reducing their noise.
2. Population and urbanisation trends.
3. Economic trends and trends in motor vehicle ownership.
4. Traffic trends, particularly in urban areas.
5. Changes in legislation.
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A 4.8-g bullet leaves the muzzle of a rifle with a speed of 328 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.75-m-long barrel of the rifle
The force exerted on the bullet while it travels down the barrel of the rifle is approximately 6317.3 N.
Using the formula for constant acceleration, the force can be calculated by multiplying the mass of the bullet by its acceleration. Therefore, the force exerted on the bullet is equal to the product of the mass of the bullet and its acceleration. In this case, the mass of the bullet is 4.8 g, or 0.0048 kg, and its acceleration is calculated by dividing the square of the muzzle velocity by twice the length of the barrel. Therefore, the force exerted on the bullet is approximately 6317.3 N.
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a mass attached to a spring vibrates back and forth. at maximum displacement, which of the following values are zero
A mass attached to a spring vibrates back and forth. at maximum displacement.
At the maximum displacement of a mass attached to a spring, the velocity is zero, but the acceleration is not zero.
The maximum displacement is the amplitude of the motion, at which point the restoring force of the spring is at its maximum, and the potential energy is also at its maximum.
The kinetic energy of the system is zero at the maximum displacement. As the mass attached to the spring moves towards its equilibrium position, its kinetic energy increases and its potential energy decreases, until it reaches the equilibrium position where the kinetic energy is at its maximum, and the potential energy is zero. The acceleration is zero at the equilibrium position. As the mass continues to move past the equilibrium position, the potential energy increases, and the kinetic energy decreases until it reaches the maximum displacement again, and the cycle repeats.
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An electron moves in a circular trajectory of radius R0 in a uniform magnetic field of strength B0. What is the new trajectory if the field strength is doubled?
If the strength of the magnetic field is doubled, the electron's trajectory will also change.
The new trajectory of the electron will have a smaller radius, since the magnetic force acting on the electron is proportional to the field strength. This means that the electron will curve more tightly and move in a smaller circle with a new radius of [tex]R_{0}[/tex]/2. This is because the magnetic force experienced by the electron is proportional to the cross product of the velocity and magnetic field vectors, which causes the electron to move in a circular path perpendicular to both vectors. Therefore, as the magnetic field strength increases, the electron's trajectory will become more tightly curved.
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A. All objects in the room (that aren't emitting heat) are the same temperature-ro temperature. So, why do some feel warmer than others?
Answer: The reason why some objects feel warmer than others even if they are at the same temperature has to do with their thermal conductivity. Thermal conductivity is a measure of how well a material can transfer heat. Materials with high thermal conductivity transfer heat easily, while materials with low thermal conductivity do not transfer heat as easily.
When you touch an object, your skin can’t actually detect the temperature of the object itself. Instead, it senses its own temperature. If you touch an object that is a good thermal conductor, it will transfer heat to or from your skin quickly, making your skin feel warmer or colder. On the other hand, if you touch an object that is not a good thermal conductor, it will transfer heat to or from your skin more slowly, so your skin won’t feel as warm or cold.
So, even if two objects are at the same temperature, one may feel warmer than the other because it is transferring heat to your skin more quickly due to its higher thermal conductivity.
A chemical that is frequently applied just prior to filtration is
One example of a chemical that is frequently applied just prior to filtration is a coagulant.
Coagulants or flocculants are chemicals that are commonly used in water and wastewater treatment processes to aid in the removal of suspended particles, colloids, and other impurities from water or wastewater. These chemicals are typically added just prior to the filtration step in the treatment process.
Coagulants are substances that cause destabilization and aggregation of suspended particles and colloids in water, leading to the formation of larger particles called flocs. These flocs can be easily removed by sedimentation or filtration. Common coagulants used in water treatment include aluminum sulfate (alum), ferric chloride, and polyaluminum chloride (PAC).
Flocculants, on the other hand, are substances that promote the aggregation of smaller flocs into larger, settleable flocs. They help to speed up the sedimentation process and improve the efficiency of solid-liquid separation. Flocculants are typically used in conjunction with coagulants to enhance the overall performance of the water treatment process.
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If the Earth were to shrink in size until it became a black hole, its Schwarzschild radius would be:
The Schwarzschild radius of Earth is 0.9 centimeters if it were to become a black hole.
The Schwarzschild radius is the distance from the center of an object at which the escape velocity becomes equal to the speed of light, and thus, the object becomes a black hole.
If the Earth were to shrink in size until it became a black hole, its Schwarzschild radius would be 0.9 centimeters.
This means that if the Earth were compressed to a size smaller than 0.9 centimeters, it would become a black hole. However, it is impossible for Earth to collapse to such a small size due to the repulsive forces between particles.
In summary, if the Earth were to become a black hole, its Schwarzschild radius would be 0.9 centimeters, but it is unlikely to happen in reality.
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Question 21
Sensitivity to radiation is probably highest:
a. Just prior to pregnancy
b. During fetal development
c. During puberty
d. During young adulthood
Sensitivity to radiation is probably highest during fetal development. Option b is correct.
Fetal tissues are rapidly dividing and have a higher metabolic rate compared to adult tissues, making them more vulnerable to the damaging effects of radiation. Exposure to ionizing radiation during fetal development can increase the risk of congenital abnormalities, and even cancer.
In contrast, the risk of radiation-induced cancer tends to increase with age due to accumulated exposure over time. While radiation exposure should be minimized during all stages of life, it is particularly important to take precautions during pregnancy to minimize the risk of harm to the developing fetus. Option b is correct.
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Students perform an investigation using density to determine what kind of wood an oval-shaped block is made of.
One student attaches a lead cube to an oval-shaped piece of wood and submerges them in water, as shown in the
diagram. The lead cube keeps the wood from floating. When the wood is underwater, the water level reads 47
milliliters.
A student ties a lead cube to an oval-shaped block to prevent it from floating and immerses it in water density as part of a study to identify the sort of wood it is composed of.
What is the name of density?The term "density" (also known as "volumetric mass density" or "specific mass") refers to a substance's mass per unit of volume. Although the Latin letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho).
Who discovered density?According to legend, Archimedes shouted "Eureka!" as he rushed through the Sicilian streets. ("I've discovered it!") He had figured out what density was. Everyone has spent a significant amount of time in water during their life. The second thing Archimedes noticed was that he felt lighter floating.
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#18. What is the period of the voltage source that operates the plasma pencil?
The period of the voltage source that operates the plasma pencil is the time it takes to complete one cycle of oscillation.
The plasma pencil is a device that uses a high-voltage source to generate plasma, which can be used for various applications such as sterilization and surface modification. The period of the voltage source that operates the plasma pencil is the time it takes for the voltage to complete one cycle of oscillation. In general, the period of a voltage source is determined by the frequency of the alternating current (AC) that it generates. The frequency is measured in Hertz (Hz), which represents the number of cycles per second.
The specific period of the voltage source that operates the plasma pencil depends on the design and specifications of the device. Typically, plasma pencils operate at high frequencies ranging from tens of kilohertz to several megahertz. This high frequency allows for efficient plasma generation and control. The period of the voltage source that operates the plasma pencil is determined by the frequency of the AC it generates and can vary depending on the design and specifications of the device.
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You and your friend both own a piece of gold of the same weight. But you live on earth, and your friend lives on a planet that has a surface gravity of 1.63m/s^2. Compared to your piece of gold, your friends piece of gold has
Compared to your piece of gold, your friend's piece of gold would weigh more on their planet due to the higher surface gravity.
The weight of an object is directly proportional to the force of gravity acting on it. Therefore, since the gravity on your friend's planet is higher than on Earth, their piece of gold would weigh more. However, the actual mass of both pieces of gold would remain the same regardless of the gravitational force acting upon them. On Earth, the force of gravity is 9.81m/s^2, which means that it pulls objects towards the planet with a greater force than the planet with 1.63m/s^2 surface gravity. Therefore, your friend's piece of gold will be heavier because it is being pulled with a greater force.
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The magnetic field at the center of a circular coil of wire with N0 turns and radius R0 and carrying current I0 can be doubled by:
The magnetic field at the center of a circular coil can be doubled by either doubling the number of turns (No) to 2No or doubling the current ([tex]I_{0}[/tex]) to 2[tex]I_{0}[/tex].
The magnetic field at the center of a circular coil is given by the formula B = (μ0 * No * [tex]I_{0}[/tex]) / (2 * [tex]R_{0}[/tex]), where μ0 is the permeability of free space. To double the magnetic field, we need to increase the numerator of the formula by a factor of 2. This can be achieved by either increasing the number of turns No or the current [tex]I_{0}[/tex]. Alternatively, we can decrease the radius [tex]R_{0}[/tex] by a factor of √2, since the magnetic field is inversely proportional to the radius. Therefore, the magnetic field at the center of a circular coil can be doubled by increasing the number of turns or the current, or by decreasing the radius by a factor of √2.
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over which range of voltages does nichrome wire follow Ohm's Law
The half-life of 18F is 110 minutes. If 5 grams of FDG remain after 5 hours and 30 minutes, how much energy was emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG?A. 3.57 x 103 keVB. 1.83 x 102 keV C. 1.19 x 1026 keV D. 3.2 x 1026 keV
the amount of energy emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG is 3.57 x 10^3 keV.
To calculate the amount of energy emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG, we need to use the formula:
E = (N * A * t * e) / m
where E is the energy emitted, N is the number of radioactive atoms, A is the activity of the radioactive substance, t is the time elapsed, e is the energy per decay, and m is the mass of the substance.
We know that the half-life of 18F is 110 minutes, which means that the activity of the substance decreases by half every 110 minutes.
After 110 minutes, the remaining amount of FDG will be 2.5 grams (half of 5 grams). After another 110 minutes (220 minutes total), it will be 1.25 grams. After another 110 minutes (330 minutes total), it will be 0.625 grams. And after another 110 minutes (440 minutes total), it will be 0.3125 grams.
Therefore, after 5 hours and 30 minutes (330 + 110 minutes), the remaining amount of FDG will be 0.625 grams.
To calculate the energy emitted, we need to know the number of radioactive atoms, which can be calculated by dividing the mass by the molar mass and then multiplying by Avogadro's number. The molar mass of FDG is 181 g/mol, so 5 grams of FDG is equal to 5/181 * 6.022 x 10^23 = 1.67 x 10^22 atoms.
The energy per decay of FDG is 0.634 MeV = 634 keV.
Putting all these values into the formula, we get:
E = (1.67 x 10^22 * 0.5 * 330 * 634) / 0.181 = 3.57 x 10^3 keV
Therefore, the answer is A. 3.57 x 10^3 keV.
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Which of the following scenarios represents thermal energy transfer through radiation?
The scenario that a child sitting in front of a space heater could represent thermal energy transfer through radiation.
What is thermal energy?Thermal energy is described as the energy in an object or system due to the movement of its molecules and atoms.
Radiation occurs when heat moves as energy waves, called infrared waves, directly from its source to something else. The process of radiation is how the heat from the Sun gets to Earth.
On the other hand, electromagnetic radiation is a form of energy that is produced by oscillating electric and magnetic disturbance.
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complete question:
Which of the following represents thermal energy transfer through radiation
A)a thermometer sitting on top of a heat lamp
B)a person trying to unscrew a hot light bulb
C)a child sitting in front of a space heater
D)swimming in the pool and noticing that the deeper end of the pool is colder than the shallow end
17.) The process in which heat flows by the mass movement of molecules from one place to another is known as:
A.) conduction
B.) convection
C.) radiation
The process in which heat flows by the mass movement of molecules from one place to another is known as: B.) convection.
Convection is the transfer of heat through a fluid (gas or liquid) by the movement of the fluid itself. This movement occurs as hotter, less dense portions of the fluid rise and cooler, denser portions sink. This creates a cyclical pattern of rising and sinking motion known as convection currents.
Convection is a natural process that occurs in many systems, including the Earth's atmosphere, oceans, and mantle. It is responsible for many important phenomena, such as the circulation of air and water, weather patterns, and geological activity like volcanic eruptions and plate tectonics.
Convection is also used in many man-made systems, such as air conditioning and heating systems, cooking appliances, and industrial processes. In these systems, fluids are circulated to transfer heat from one location to another, either to cool or to heat a space or to facilitate chemical reactions.
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How can you predict the final temperature of a mixture of two substances that start at a different temperatures?
Answer:
If it is a true mixture, the mixing enthalpy is negligible, and there is no reaction or phase change, then you can do this using exclusively the temperatures of the individual compounds and their heat capacities. Any other process that takes place needs to be taken into account separately.
The solution can be found by understanding that we’re only using state variables. You can design any complicated process that starts with the starting situation and ends up at the ending situation, and the state variables will be the same. And sometimes a complicated process is easier to calculate than the simple one-step process, like here when mixing multiple components.
One way that will work is to start by bringing all compounds to the lowest temperature of either of the compounds. All but one of the compounds must be cooled down for this; make sure to calculate for each of the components how much energy is released. Now, mix all the components together. In the simplest situation sketched above you can calculate the heat capacity of the mixture by adding all the heat capacities of the components. Use this total heat capacity to calculate how much you can heat up the mixture using the energy you saved in cooling down the components earlier. This will be your desired end situation.
In case there are any phase changes or other processes in between, you need to take the energy needed for those into account too but in very similar ways.
(392-18(B)) Each run of cable tray shall be _____ before the installation of cables.
Each run of cable tray shall be inspected before the installation of cables.
Before the installation of cables, each run of cable tray shall be inspected for any signs of damage or wear. It is important to ensure that all supports are secure, that the tray is properly secured to the supports, and that any bends or turns do not exceed the manufacturer's specified radius. It is also important to check that all cable tie-downs are properly installed, as well as to check for any sharp edges or burrs that may damage the cables. In addition, any unused cable trays should be capped or sealed to prevent dust and debris from entering the tray. Finally, the cable tray should be cleared of any debris or obstructions before cables are installed.
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3. What is the angular speed in rad/s of the second hand of a watch?
A) 1.7 × 10-3 rad/s
B) 0.10 rad/s
C) 0.02 rad/s
D) 6.28 rad/s
E) 60 rad/s
The angular speed of the second hand of a watch is 0.10 rad/s.
To find the angular speed of the second hand of a watch in rad/s, we first need to know the time it takes for the second hand to make a complete revolution (360 degrees) around the watch face. Since there are 60 seconds in a minute, the second-hand makes one full revolution in 60 seconds.
Now, we convert 360 degrees to radians. Recall that 1 radian = 180/π degrees:
360 degrees * (π/180) = 2π radians
Next, we calculate the angular speed (ω) using the formula:
ω = θ/t
where θ is the angle in radians and t is the time in seconds.
ω = (2π radians) / (60 seconds) = π/30 radians/second
Thus, the angular speed of the second hand of a watch is:ω = π/30 ≈ 0.1047 rad/s
This value is closest to option B (0.10 rad/s). So, the correct answer is:
Your answer: B) 0.10 rad/s
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Question 52 Marks: 1 Yeast added to a new septic tank speeds up digestion by a factor of 2.7.Choose one answer. a. True b. False
The statement that adding yeast to a new septic tank speeds up digestion by a factor of 2.7 is not true.
Adding yeast to a new septic tank is not likely to speed up digestion, as the primary function of yeast is to ferment sugars into alcohol and carbon dioxide, rather than to break down waste materials. In fact, adding yeast to a septic tank may disrupt the natural balance of bacteria and other microorganisms that are responsible for breaking down and processing the waste.
The process of digestion in a septic tank is primarily carried out by anaerobic bacteria, which break down organic matter in the absence of oxygen. The rate of digestion depends on a variety of factors, including the size and design of the tank, the nature and amount of waste materials being processed, and the temperature and pH of the tank environment.
Therefore, the statement that adding yeast to a new septic tank speeds up digestion by a factor of 2.7 is not true.
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True or FalseTXVs used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant.
The True. TXVs used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant. However, it is recommended to follow the manufacturer's specifications and guidelines to ensure proper operation and efficiency.
True, TXVs Thermostatic Expansion Valves used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant. Heat pumps and air conditioners have the same set of mechanical components, the same set of the system used for heating purposes can be used for cooling purposes. This is done by the use of a reversible valve in the cycle. flow controllers are designed to adjust the flow of refrigerant into the evaporator so that only vapor leaves the evaporator.
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a rocket with mass 1.2*10^6 has a relativistic kinetic energy of 2.6*10^23 how fast is the rocket moving toppr
The rocket is moving very close to the speed of light, with a velocity of approximately 0.99999999999999999997 times the speed of light.
What is Kinetic Energy?
Kinetic energy is the energy possessed by an object due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity.
We can use the relativistic kinetic energy equation to solve for the velocity of the rocket:
K = (γ - 1)m[tex]c^{2}[/tex]
where K is the relativistic kinetic energy, m is the mass of the rocket, c is the speed of light, and γ is the Lorentz factor, which is given by:
γ = 1 / sqrt(1 - v^2/[tex]c^{2}[/tex])
where v is the velocity of the rocket.
Solving for γ, we get:
γ - 1 = 2.2908*[tex]10^{8}[/tex]
γ = 2.2908*[tex]10^{8}[/tex]+ 1
γ = 2.2908*[tex]10^{8}[/tex]
Substituting γ into the Lorentz factor equation and solving for v, we have:
v = c * sqrt(1 - 1/[tex]γ^{2}[/tex])
v ≈ 0.99999999999999999997c
where c is the speed of light. So the rocket is moving very close to the speed of light, with a velocity of approximately 0.99999999999999999997 times the speed of light.
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A 600 nm laser illuminates a double-slit apparatus with a slit separation distance of 3.55 μm. The viewing screen is 1.50 meters behind the double slits. What is the distance, in cm, from the central bright fringe to the 3rd dark fringe?
The distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.
Solution
The distance between the central bright fringe and the 3rd dark fringe in a double-slit experiment is given by:
y = (m * λ * L) / d
If y denotes the distance between the edges,
m is the fringe order (an integer value representing the number of bright or dark fringes away from the central fringe),
λ is the wavelength of the light,
L is the length between the two slits.
The distance between the two slits is given by d.
Substituting the given values, we get:
y = (3 * 600 nm * 150 cm) / 3.55 μm
y = 4800 nm
Converting nanometers to centimeters, we get:
y = 4800 nm * (1 cm / 10^7 nm)
y = 0.48 cm
Therefore, the distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.
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A 1000 kg truck going 8 m/s west strikes a 900 kg car
going 6 m/s East. The truck continues west at 1.4 m/s.
What is the final velocity of the car?
The final velocity of the car is 1.33 m/s to the west.
What is the final velocity of the car?The final velocity of the car is calculated by applying the principle of conservation of linear momentum.
m1v1 + m2v2 = m1v1' + m2v2'
where;
m1 and m2 are the masses of the truck and the car, respectivelyv1 and v2 are their initial velocities, and v1' and v2' are their final velocities.The final velocity of the car is calculated as
(1000 kg)(-8 m/s) + (900 kg)(6 m/s) = (1000 kg)(-1.4 m/s) + (900 kg)(v2')
-2,600 = -1400 + 900v2'
v2' = -1200/900
v2' = -1.33 m/s
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Question 15 Marks: 1 If 10 decibels is 10 times more intense than one decibel, how many times more intense is 20 decibels than one decibel?Choose one answer. a. 20 b. 30 c. 100 d. 1000
If 10 decibels is 10 times more intense than one decibel, then 20 decibels would be 100 times more intense than one decibel (10 times more intense than 10 decibels). Therefore, the answer is c. 100.
Sound is measured in decibels (dB). A whisper is about 30 decibels, a normal conversation is about 60 decibels, and a motorcycle engine runs about 95 decibels.
Noise levels above 70 decibels for long periods of time can begin to damage your hearing. Noise above 120 decibels can damage your hearing.
A 20 dB increase in noise represents a 100-fold increase in noise. This is because dB is a logarithmic unit, and an increase of 20 dB corresponds to a positive factor of 10^ (20/10) = 100.
Therefore, a sound that is 20 dB louder than another sound is 100 times stronger. Likewise, a 40-decibel increase in noise means one sound is 10,000 times louder than another, and so on.
Therefore, the correct answer is 100.
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