Final answer:
B. Its dust conducts electricity.
Explanation:
Using emery cloth for polishing the commutator of an appliance motor can generate conductive dust particles. When these particles come into contact with the commutator, they can cause short circuits or other electrical malfunctions, potentially damaging the motor. While option A, wearing the surface too much, could also be a concern, the primary reason to avoid emery cloth is the risk of conductive dust. Options C and D are not directly related to the electrical conductivity issue associated with emery cloth. Therefore, option B is the most appropriate choice to avoid potential electrical hazards during motor maintenance.
Which refers to the temperature to which air would have to be cooled to reach saturation?
Answer: It is called Dew Point
Explanation: The dew point is the exact temperature to which air must be cooled to become saturated with water vapor, if further cooled, the water vapor will condense to form liquid water.
Which is an example of natural erosion? ice forming in cracks of rocks acid rain falling on sidewalks waves washing over rocks on the beach water washing away soil in an area with off-road vehicles
Answer: waves washing over rocks on the beach
Explanation:
A natural erosion is a phenomena of removal of the top layer of the soil or any other surface material by the action of the natural physical agents like water, wind and others. Waves washing over rocks on the beach is the correct example of natural erosion because waves from any water body are naturally generated by the effect of wind and gravity these can wipe the surface materials present over the rocks on the beach.
A ufo was detected on the radar flying 7400 miles in 3 min, what is the estimated speed per hour?
As much as 90% of the matter in the universe may be unseen “dark matter.” where is this dark matter?
Final answer:
Dark matter is an unseen substance that makes up about 90% of the universe's mass, detectable through its gravitational effects on visible matter. It exists in a halo around galaxies and is essential for understanding the universe's composition and expansion fate.
Explanation:
The unseen matter that may constitute as much as 90% of the universe is known as dark matter. This dark matter is not directly observable because it does not emit or reflect any electromagnetic radiation. However, its existence is inferred from gravitational effects on visible matter, radiation, and the large-scale structure of the universe.
For example, galaxies contain far more mass than can be accounted for by the visible objects we can observe, and this extra mass is attributed to dark matter. The rapid rotation of stars on the outskirts of galaxies is one such gravitational effect indicating the presence of dark matter in a halo around the galaxies.
Discovering the true nature of dark matter is crucial as it may provide insights into particle physics and cosmology. There are theories that dark matter could be composed of neutrinos with a small mass or entirely new types of particles that have never been detected.
The understanding and evidence of dark matter continue to evolve, highlighting its importance in the universe's critical density and its possible role in the ultimate fate of the cosmic expansion.
Name of the thing that hangs off a zipper
Consider the transition from the energy levels n = 3 to n = 6. what is the wavelength associated with this transition, in nm?
What is the most relevant characteristic of motion
Which of the following describes the mechanical advantage of a compound machine?
People who view society as a set of interrelated parts that work together to produce a stable social system are said to employ the
a.
manifest function.
c.
interactionist perspective.
b.
theoretical perspective.
d.
functionalist perspective.
The people who see society as a collection of interconnected components that cooperate to create a stable social order are said to use a Functionalist Perspective. Hence, option D is correct.
What is a Functionalist Perspective?Each component of society is interrelated and contributes to the stability and smooth operation of society as a whole, according to the functionalist perspective in sociology. For instance, the government pays for the education of the family's children, who then pay taxes that the state needs to function.
In other words, the family depends on the school to assist kids in getting decent careers as adults, so they can support and raise their own families.
If everything works out, society's constituent elements provide production, stability, and order. If things do not go as planned, the components of society must then adjust to reestablish a new order, stability, and productivity.
Hence, the people who see society as a collection of interconnected components that cooperate to create a stable social order are said to use a Functionalist Perspective.
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A 200 g oscillator in a vacuum chamber has a frequency of 2.0 hz. when air is admitted, the oscillation decreases to 60% of its initial amplitude in 50 s. how many oscillations will have been completed when the amplitude is 30% of its initial value?
Approximately 235 oscillations will have been completed when the amplitude of the oscillator decreases to 30% of its initial value.
To solve this problem, let's first understand the concept. The amplitude of an oscillator in simple harmonic motion decreases over time when air is admitted due to damping. We'll use the concept of exponential decay to model the decrease in amplitude.
The formula for exponential decay is:
[tex]\[ A(t) = A_0 \times e^{-\frac{t}{\tau}} \][/tex]
Where:
- A(t) is the amplitude at time t.
- [tex]\( A_0 \)[/tex] is the initial amplitude.
- [tex]\( \tau \)[/tex] is the time constant, which depends on the damping coefficient.
- e is the base of the natural logarithm.
Given that the amplitude decreases to 60% of its initial value in 50 seconds, we can use this information to find the time constant [tex]\( \tau \).[/tex]
[tex]\[ 0.6A_0 = A_0 \times e^{-\frac{50}{\tau}} \][/tex]
Solving for [tex]\( \tau \):[/tex]
[tex]\[ e^{-\frac{50}{\tau}} = 0.6 \][/tex]
[tex]\[ -\frac{50}{\tau} = \ln(0.6) \][/tex]
[tex]\[ \tau = -\frac{50}{\ln(0.6)} \][/tex]
Now, we can use the value of [tex]\( \tau \)[/tex] to find the time it takes for the amplitude to decrease to 30% of its initial value.
[tex]\[ 0.3A_0 = A_0 \times e^{-\frac{t}{\tau}} \][/tex]
Solving for t:
[tex]\[ e^{-\frac{t}{\tau}} = 0.3 \][/tex]
[tex]\[ -\frac{t}{\tau} = \ln(0.3) \][/tex]
[tex]\[ t = -\tau \times \ln(0.3) \][/tex]
Now, we need to find the number of oscillations completed during this time. We know that the frequency of oscillation is 2.0 Hz, which means the oscillator completes 2 oscillations every second.
Number of oscillations = frequency × time
Number of oscillations = 2.0 × t
Let's compute these values.
First, let's calculate the value of [tex]\( \tau \):[/tex]
[tex]\[ \tau = -\frac{50}{\ln(0.6)} \][/tex]
[tex]\[ \tau \approx -\frac{50}{-0.5108} \][/tex]
[tex]\[ \tau \approx 97.85 \, \text{s} \][/tex]
Now, let's find the time it takes for the amplitude to decrease to 30% of its initial value:
[tex]\[ t = -\tau \times \ln(0.3) \][/tex]
[tex]\[ t \approx -97.85 \times \ln(0.3) \][/tex]
[tex]\[ t \approx 97.85 \times 1.2039 \][/tex]
[tex]\[ t \approx 117.65 \, \text{s} \][/tex]
Now, let's find the number of oscillations completed during this time:
Number of oscillations [tex]= 2.0 \times t[/tex]
Number of oscillations [tex]\approx 2.0 \times 117.65[/tex]
Number of oscillations [tex]\approx 235.3[/tex]
Since the number of oscillations must be a whole number, we can assume it to be 235 oscillations.
Therefore, when the amplitude is 30% of its initial value, approximately 235 oscillations will have been completed.
Lines with irregular meter and length are called _____.
Lines with irregular meter and length are called Free Verse.
Free Verse, a literary device in literature refers to the poetry which is free from defects of regular rhythm or meter and length. There is no rhythm of the words, and no rhyme scheme in such kind of literary pieces. These kind of poems simply do not follow the rules of poetry.
A missile is fired from a jet flying horizontally at mach 1 (1100 ft/s). The missile has a horizontal acceleration of 1000ft/s. Calculate its horizontal velocity at 10.0 seconds after it is fired
To find the horizontal velocity of the missile at 10.0 seconds after firing, use the motion equation v = u + at, with u = 1100 ft/s and a = 1000 ft/s²2. This results in a final velocity (v) of 11100 ft/s.
Calculating the Horizontal Velocity of a Missile
To calculate the horizontal velocity of the missile at 10.0 seconds after it is fired, we can use the equation of motion which relates initial velocity, acceleration, and time to find the final velocity. The equation we will use is:
v = u + at
Where:
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
Given:
Initial velocity (u) = Mach 1 = 1100 ft/s
Horizontal acceleration (a) = 1000 ft/s²
Time (t) = 10.0 s
To find the final velocity (v):
v = 1100 ft/s + (1000 ft/s² * 10.0 s)
v = 1100 ft/s + 10000 ft/s
v = 11100 ft/s
Therefore, the horizontal velocity of the missile at 10.0 seconds after being fired is 11100 ft/s.
Which example identifies a change in motion that produces acceleration?
a. a ball moving at a constant speed around a circular track
b. a particle moving in a vacuum at constant velocity
c. a speed skater moving at a constant speed on a straight track
d. a vehicle moving down the street at a steady speed?
Option (a) is correct. The motion of a ball moving in a circular path at a constant speed is termed as the motion with acceleration.
Explanation:
The acceleration of a body is defined as the rate of change of velocity of the body. If the velocity of object under motion continues to change during the motion, the object is considered to be moving under acceleration.
The change in velocity is not only about the change in the magnitude of the speed of the object but it is also the change in the direction of motion of the object moving at a constant speed.
The motion of a particle in a circular path at a steady speed is an accelerated motion because the direction of motion of the ball changes at every instant during its motion in a circular path. The change in direction also changes the velocity of the object and therefore, it is categorized as the accelerated motion.
The motion of a particle at constant velocity in vacuum, a skater moving with a constant speed on a straight track and a vehicle moving on a street at steady speed are not considered as the accelerated motion because the velocity of the body does not change and the direction of motion also remains the same during the motion.
Thus, Option (a) is correct. The motion of a ball moving in a circular path at a constant speed is termed as the motion with acceleration.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Motion in one dimension
Keywords:
Acceleration, velocity, rate of change, speed, direction of motion, steady speed, straight track, circular track, constant, vacuum.
A force scale is attached to a stack of books lying on a flat table. 1.What happens to the size of the static frictional force as you begin to pull on the force scale? 2.What happens to the stack of the books if the applied force exceeds the maximum static frictional force? 3.What is the minimum size for the static frictional force, and under what conditions will the minimum static frictional force be observed? 4.What type of friction acts when the books are at rest but a force is exerted?
Static frictional force matches the applied force up to its maximum, after which the books slide, switching to kinetic friction. Minimum static friction is zero and occurs with no applied force. When resting books are subjected to a force below the static threshold, static friction acts.
Explanation:Frictional Forces and a Stack of Books
When you begin to pull on a force scale attached to a stack of books lying on a table, the size of the static frictional force initially increases to match the applied force, up to its maximum value. If the applied force exceeds this maximum static frictional force, the books will begin to slide across the table, transitioning to a state where kinetic friction is acting on them. The minimum size for the static frictional force is observed when there is no applied force, and in such cases, it is effectively zero. While the books are at rest and a force is exerted that is below the static friction threshold, the type of friction acting is still static friction.
The pulse site located at the point where the upper leg bends is called the
Average velocity is different than average speed because calculating average velocity involves
Answer:
Displacement
Explanation:
We are given that average velocity is different than average speed.
We have to find what involves average velocity.
Average velocity:It is defined as the displacement per unit time.
Mathematical representation,
Average velocity=[tex]\frac{displacement}{time}=\frac{ds}{dt}[/tex]
Average speed:It is defined as the distance per unit time.
Average speed=[tex]\frac{distance}{time}=[tex]\frac{s}{t}[/tex]
Average velocity is different from average speed because calculating average velocity involves displacement but average speed involves distance.
On a cloudless day, what happens to most of the visible light headed toward earth? hints on a cloudless day, what happens to most of the visible light headed toward earth? it is reflected by earthâs atmosphere. it is absorbed and reemitted by gases in earthâs atmosphere. it is completely reflected by earthâs surface. it reaches earthâs surface, where some is reflected and some is absorbed.
What is the main function of an ignition safety switch?
Answer:
to produce spark in engen
Explanation:
The main function of an ignition safety switch in an automobile is to prevent the engine from starting without the key being inserted into the ignition.
Explanation:The main function of an ignition safety switch in an automobile is to prevent the engine from starting without the key being inserted into the ignition. It acts as a security measure to prevent unauthorized individuals from starting the vehicle. The switch is typically located close to the steering column and is connected to the ignition system.
When the key is inserted and turned in the ignition, it completes the circuit and allows electrical current to flow to the ignition system, which then starts the engine. If the ignition safety switch is not engaged or faulty, the circuit remains incomplete, and the engine will not start even if the key is turned.
Liquid flows through a 4.0 cm diameter pipe at 1.0 m/s. there is a 2.0 cm diameter restriction on the line. what is the velocity in this restriction?
The question pertains to the principle of continuity in fluid dynamics. When fluid flows from a wider to a narrower part of a pipe, its velocity increases to ensure that the mass flow rate remains constant. The velocity at the restriction can be found by plugging the appropriate area and velocity values from the wider part of the pipe into the continuity equation.
Explanation:The subject in question relates to the physics principle of fluid dynamics. Specifically, we're discussing the continuity equation, which states that the mass flow rate must be constant throughout the pipe, irrespective of changes in the pipe's diameter. This is because the fluid is incompressible, meaning the same amount of fluid must flow past any point in the tube in a given time to ensure continuity of flow. Consequently, when the cross-sectional area of the pipe decreases, the velocity increases.
The formula that represents the continuity equation is A₁V₁= A₂V₂, where A represents the cross-sectional area of the pipe and V represents the velocity of the fluid. To find the velocity at the restriction (V₂), we must plug in the values for A₁, V₁, and A₂. Here, A₁ is the cross-sectional area of the larger part of the pipe, V₁ is the velocity in the larger pipe, and A₂ is the cross-sectional area of the restricted part.
To calculate A₁ and A₂, we use the formula for the area of a circle, which is A=πr². For A₁, r (radius) is half of the larger diameter, that is, 2 cm and for A₂, r is 1 cm (half of the restricted diameter). Substituting these values into the continuity equation will yield the desired velocity at the restriction (V₂).
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How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N
Force needed to accelerate an object is 108 N. The correct option is third.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
From the Newton's second law of motion, force is given by
F = ma
where, m is the mass of the object and a is the acceleration
Given
Plug the values, we get
F = 90 x1.2
F = 108 N
So, the force needed is 108 N.
Thus, the correct option is third.
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Salt water is denser than fresh water. a ship floats in both fresh water and salt water. compared to the fresh water, the volume of water displaced in the salt water is
Final answer:
Compared to fresh water, a ship displaces less volume of salt water because salt water is denser, which means the ship will float higher in salt water.
Explanation:
When a ship floats in both fresh water and salt water, the volume of water displaced in the salt water is less compared to fresh water. This is because salt water is denser than fresh water. According to Archimedes' Principle, an object submerged in a fluid will displace a volume of fluid equal to its own weight. Since salt water is denser, a ship doesn't need to displace as much volume of water in saltwater to equal its weight and achieve buoyancy. This is the main reason why a ship will float higher in salt water than in fresh water.
Which one of these foods must be cooked to at least 165°f?
a. ground beef
b. pork
c. vegetables
d. chicken?
Among the foods mentioned - ground beef, pork, vegetables, and chicken - chicken is the one that must be cooked to at least 165°F to safely consume and ensure all harmful bacteria have been killed.
Out of the foods listed - ground beef, pork, vegetables, and chicken - the one that must be cooked to at least 165°F (73.9°C) is chicken.
Poultry, including chicken, should be cooked to a minimum internal temperature of 165°F as recorded on a food thermometer, to kill off any harmful bacteria that may be present. The safe minimum cooking temperature for ground meat, such as ground beef and pork, is lower at 160°F. Vegetables can be eaten raw or cooked to any preferred temperature.
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An astronaut is taking a space walk near the shuttle when her safety tether breaks. what should the astronaut do to get back to the shuttle
An untethered astronaut can return to the shuttle by using conservation of momentum or a safety jetpack known as Simplified Aid for EVA Rescue (SAFER). The first method involves throwing an object in the opposite direction, and the other involves using SAFER to propel back.
Explanation:If an astronaut finds themselves adrift in space without a tether, their best bet would be to try and use conservation of momentum to return to the shuttle. They can do this by throwing an object in the opposite direction they wish to travel -- such as a tool or even their own glove. This action would propel them back towards the shuttle due to Isaac Newton's Third Law of Motion: For every action, there is an equal and opposite reaction.
Additionally, astronauts carry a safety jetpack called a Simplified Aid for EVA Rescue (SAFER) during spacewalks. They could use this to propel themselves back towards the shuttle.
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The climate zones lying between 23.5 and 66.5 north and south latitude are called the
Answer:
A
Explanation:
Floods, droughts, fires, and earthquakes are examples of _____.
Natural disasters
Explanation;Floods, droughts, fires, and earthquakes are examples of natural disasters.Natural disasters are events that occur as a result of natural processes of the earth and cause adverse effects. They include, floods, volcanic eruptions, tsunamis, tornadoes, and hurricanes among others.These events are extreme, sudden events caused by environmental factors that injure people and damage property. For example, floods and earthquakes may strike anywhere on earth , often without warning.What effect does heating a solid to a high temperature have on its crystal lattice?
The lattice breaks apart and the ions flow freely. Gradpoint answer
What best describes the overall impact of wilhelm roentgen's discovery of x-rays?
The human body is an organism made up of cells, tissues, organs, and organ system. Here are examples of three types of muscle tissue that are made of very different cells. How can scientists determine what type of cells make up each of these three tissues? A) By using a magnifying glass to observe each tissue. B) By collecting the tissues of people who have died and making observations. C) By dissecting the tissues and then making observations using a dissecting scope. Eliminate D) By placing samples of each tissue on a slide and viewing the slides using a microscope.
In egypt, the physiologic density is ______ greater than the arithmetic density [estimate value], because _______ [reason for difference].
John rows his canoe due east across a river at 5.5 miles per hour. if the river is flowing south at 4 miles per hour, find john’s direction.