Answer:
A. crab
Crab is an invertebrate.
A stereo speaker is made of a flexible cone-shaped material that vibrates, creating a sound wave. A sound wave formed be a speaker travels through air to your ear as a series of compressions and rarefactions of air molecules.
Which statement classifies the sound wave?
transverse wave in which the particles of the wave move in a direction parallel to the wave motion
longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion
transverse wave in which the particles of the wave move in a direction perpendicular to the wave motion
O longitudinal wave in which the particles of the wave move in a direction perpendicular to the wave motion
Answer: longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion
The sound wave is a longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion.
What is a wave of sound?A sound wave can be described as the pattern of distribution caused by the movement of energy that is traveling through a medium, such as air, water, or any liquid or solid matter, etc, as it is traveling away from the source of the sound. There are two types of sound waves:
Longitudinal wave: When the particles of the medium move in a direction parallel to the direction that the wave moves then the wave is known as the longitudinal wave.
Transverse Wave: When the particles of the medium move in a direction perpendicular to the direction that the wave moves then the wave are known as the transverse wave.
As it is given that the sound wave formed by the speaker travels through the air to your ear as a series of compressions and rarefactions of air molecules, therefore, the particles of the medium move in a direction parallel to the direction that the wave.
Hence, the sound wave is a longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion.
Learn more about Sound Wave:
https://brainly.com/question/11797560
A worker begins pushing a 60-kg crate across the floor with a force of 86N, causing an acceleration of 0.20m/s2 what is the force of friction ?
Which injury stimulates muscle growth? critical injury microtrauma broken bone overuse injury
Answer: Microtrauma stimulates muscle growth!
Explanation - I hope that helped!
It takes 8.76 hours to travel 427 miles Northwest from Chicago, Illinois to Minneapolis, Minnesota. What is your velocity for the trip?
Answer:
infinity
Explanation:
this is because time is irrelevant
A 0.140 kg baseball is thrown with a velocity of 28. m/s It is struck with an average force of 5000.0 N,which results in a velocity of 37.0 m/s in the opposite direction. How long were the bat and ball in contact?
Check the images.. it has a few different questions and answers! Hope it helps
please help me out i'm so depressed and such a failure
how does the brightness of the lamp (L) vary if we dispalce the cursor (C) of the rheostat
a)Towards A
b) Towards B
Answer: a variety of ohmic valu example, VIN = VR1 + VR2.
Potentiometer Example No1
A resistor of 250 ohms is connected in series with a second resistor of 750 ohms so that the 250 ohm resistor is connected to a supply of 12 volts and the 750 ohm resistor is connected to ground (0v). Calculate the total series resistance, the current flowing through the series circuit and the voltage drop across the 750 ohm resistor.
potentiometer example one
Explanation:
uman ear has a logarithmic response and is therefore non-linear.
If we where to use a linear potentiometer to control the volume, it would give the impression to the ear that most of the volume adjustment was restricted to one end of the pots track. The logarithmic potentiometer however, gives the impression of a more even and balanced volume adjustment across the full rotation of the volume control.
So the operation of a logarithmic potentiometers when adjusted is to produce an output signal which closely matches the nonlinear sensitivity of the human ear making the volume level sound as though it is increasing linearly. However, some cheaper logarithmic potentiometers are more exponential in resistance changes rather than logarithmic but are still called logarithmic because their resistive response is linear on a log scale. As well as logarithmic potentiometers, there are also anti-logarithmic potentiometers in which their resistance quickly increases initially but then levels off.
The all potentiometers and rheostats are available in a choice of different resistive tracks or patterns, known as laws, being either linear, logarithmic, or anti-logarithmic. These terms are more commonly abbreviated to lin, log, and anti-log, respectively.
The best way to determine the type, or law of a particular potentiometer is to set the pots shaft to the center of its travel, that is about half way, and then measure the resistance across each half from wiper to end terminal. If each half has more or less equal resistance, then it’s a Linear Potentiometer. If the resistance appears to be split at about 90% one way and 10% the other then chances are it’s a Logarithmic Potentiometer.
Potentiometer Summary
In this tutorial about potentiometers, we have seen that a potentiometer or variable resistor basically consists of a resistive track with a connection at either end and a third terminal called the wiper with the position of the wiper dividing the resistive track. The position of the wiper on the track is adjusted mechanically by rotating a shaft or by using a screwdriver.
Variable resistors can be categorised into one of two operational modes – the variable voltage divider or the variable current rheostat. The potentiometer is a three terminal device used for voltage control, while the rheostat is a two terminal device used for current control.
We can summarise this in the following table:
Type Potentiometer Rheostat
Number of
Connections Three Terminals Two Terminals
Number of Turns Single and Multi-turn Single-turn Only
Connection Type Connected Parallel with a Voltage Source Connected in Series with the Load
Quantity Controlled Controls Voltage Controls Current
Type of Taper Law Linear and Logarithmic Linear Only
Then the potentiometer, trimmer and rheostat are electromechanical devices designed so that their resistance values can be easily changed. They can be designed as single-turn pots, presets, slider pots, or as multi-turn trimmers. Wirewound rheostats are mainly used to control an electrical current. Potentiometers and rheostats are also available as multi-gang devices and can be classified as having either a linear taper or a logarithmic taper.
Either way, potentiometers can provide highly precise sensing and measurement for linear or rotary movement as their output voltage is proportional to the wipers position. The advantages of potentiometers include low cost, simple operation, lots of shapes, sizes and designs and can be used in a vast array of different applications.
However as mechanical devices, their disadvantages include eventual wear-out of the sliding contact wiper and/or track, limited current handling capabilities (unlike Rheostats), electrical power restrictions and rotational angles that are limited to less than 270 degrees for single turn pots
100 points!!! Please help!!!
In the system shown above, the pulley is a uniform disk with a mass of .75 kg and a radius of 6.5 cm. The coefficient of friction between the 5.8 kg mass and the horizontal surface is .25, and the ropes does not slip on the pulley. They system is released from rest. Use work-energy principles to determine the kinetic energy of the (a) 2.8 kg mass and (b) the pulley after the 5.8 kg mass has moved 2.2 meters.
Answer:
please find the answer in the attached image, divided in 2 parts.
What Law and explain why.
An airplane turns on its jets to accelerate down a runway.
Answer:Newton's 2nd law
Explanation:Newton's 2nd law also states that the rate at which an object changes speed is proportional to the force that is exerted. Engines provide thrust and accelerate a plane forward along the runway. If the engines supply a small force, only a small acceleration will result.
Imagine rubbing a balloon on your hair or clothes and putting extra electrons on the balloon to give it a negative charge. If you touch the balloon to a wall, it may stick to the wall. Explain why you think this happens.
Answer:
Because here is a number of electrons more applied to the balloon
Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen
atoms. Which force keeps water molecules stuck to one another?
Answer:
Surface tension.
Explanation:
Water has this thing called surface tension, where the water, most of the time, is hard to split.
A few examples of surface tension in action:
If you spill some water, you can see that they seem to connect together as if they were magnetic.You can put around 20-30 drops of water on average on a penny. This shows that water has better surface tension than other liquids, like oil, that can the penny can only hold around 10-15.Lastly, water bugs (which are kind of like mosquitos) can actually stay on top of the water, because they do not break the surface tension of it.Hope this helps you!
Which of the following describes a transfer of energy through work?
A student carries a heavy backpack one km
O A laboratory burner is used to heat 250 ml of water to boiling,
O A woman pushes a luggage cart in an airport over a distance of 100 m
O A man pushes on a large piece of furniture for 15 min, but it does not move.
An object's velocity/speed increases, multiplied by a factor of 7. What factor would its Kinetic Energy increase by?
Answer:
k.E= 49 ms^-2
Explanation:
k.E= 1/2 mv^2
From that formula of k.E
K.E is directly proportional to the ( velocity)^2
K.E directly proportional to (7)^2
so that k.E increase by 49
A 50,000 kg train is rolling on its own down the track at 5 m/s. You grab the rope trailing behind it, and exert a stopping force of 2000 N. How long does it take to stop the train?
Answer:
t = 125 seconds
Explanation:
Given that,
The mass of a train, m = 50,000 kg
Initial speed, u = 5 m/s
Stopping force, F = 2000 N
We know that,
Force, F = ma
Where
a is acceleration
[tex]F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{50000(0-5)}{-2000}\\\\t=125\ s[/tex]
So, it will take 125 seconds to stop the car.
How has modern safety equipment found in automobiles helped to counteract Newton’s First Law of Motion?
Answer:
Well. the law says "an object in motion stays in motion" So seatbelts could be one. they stop us humans from continuing to move when the car stops.
describe two effects of weathering on a cliff
Answer:
In coastal areas, strong winds and powerful waves break off soft or grainy rocks from hardier rocks. Too much weathering occurs, it might break off parts of the cliff and be dangerous to humans, or animals.
Rain has acid in it which could eat up the cliff.
Explanation:
Which of the following is an example of an omnivore?
A
an herb like basil, which gets energy from the sun
B
a dog, which eats meat and vegetables
с
a dinosaur that only eats marsh grasses
D
a buzzard that only eats roadkill
Answer:
B a dog omnivor is like us we are hunter gatherers, plants and meat
Answer:
B
Explanation:
omnivores eat both crops and meat .The dog exhibited this trait.
Refer to the diagram to answer the question. Which part of the eye enables it to focus? A B C D E
Answer:
what are the A B C D E
Explanation:
Rogan claims that he can run 8 miles per hour. Use the speed formula to determine how many minutes it would take him to run one mile.
Answer:
he would have to run at a 7 and a half mile to get 8 miles in an hour
Explanation:
Answer:
7.5 minutes
Explanation:
We know that there are 60 minutes in an hour. So, we can say that Rogan can run 8 miles per 60 minutes. Now, we can create an equation to solve for how many minutes it would take per mile.
8/60 = 1/x
x = 7.5
So, it would take Rogan approximately 7.5 minutes to travel 1 mile.
A tank of water is 4m deep. How deep does it appear when seen normally?
Answer:
The tank appears to be 3 m deep only. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.
Reflection off of a smooth surface like a mirror is an example of diffuse reflection.
true or false?
Answer:
true
Explanation:
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. ... This is called diffuse reflection. Diffuse reflection is when light hits an object and reflects in lots of different directions.
Answer:
false
its regular reflection.
hope it helps.
a cyclist travelling 72 kilometre per hour comes to rest in 5secs
Answer:
14.4
Explanation:
distance / time
so
72/5
14.4
Explain the effects of expansion of water on aquatic life
Answer:
The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. If the temperature falls further, the top layer expands and remains on the top till it freezes.
लाइ फ्युजका
4
Why MCB is called the developed form of fuse? Give the reason
Miniature circuit breakers is called the developed form of fuse because MCBs are more sensitive to current than fuses. They immediately detect any abnormality and switch off the electrical circuit automatically. This prevents any permanent damage to electrical appliances and human beings
The motor for your electric car is attached to a generator. The motor has a
resistance of 28 ohms and the current is 3.8 amperes (A). What is the generator's
voltage?
Answer:
106.4V
Explanation:
Voltage = resistance * current
which of the following is not a main function of the human's body nervous system?
Answer:
I can't see option dear
Explanation:
Which indicates that light travels in straight lines?
A. Color
B. Pigments
C. Shadows
D. Waves
Answer:
A
Explanation:
Answer:
C
Explanation:
Light travels in straight lines
Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow.
If the player in the attached figure wants to kick the ball as far as possible (the greatest range R), what is the angle he should kick the ball at?
How many free electrons are there in 2.55 cm^ ^ 3 of pure Silicon Note N = Vp and rho = 1.54 free electrons / cm ^3
A: 3.93 x 10^20 free electrons
B: 6.32 x 10^20 free electrons
C: 3.93 x 10^22 free electrons
D: 6.32 x 10^2× free electrons
Answer:
C: 3.93 x 10^22 free electrons
Explanation:
The no. of free electrons can be found out using the following formula:
[tex]N = V\rho\\[/tex]
where,
N = No. of free electrons = ?
V = Volume = 2.55 cm³
ρ = density of electrons = 1.54 x 10²² free electrons/cm³
Therefore, using these values in the equation, we get:
[tex]N = (2.55\ cm^3)(1.54\ x\ 10^{22}\ free\ electrons/cm^3)\\[/tex]
N = 3.93 x 10²² free electrons
Therefore, the correct option is:
C: 3.93 x 10^22 free electrons
A 1500 kg car accelerats from 55.0 m/s to 90.0 m/s. Calculate the impulse experienced by the car
Answer:
The impulse experienced by the car is 52,500 kg.m/s.
Explanation:
Given;
mass of the car, m = 1500 kg
initial velocity of the car, u = 55 m/s
final velocity of the car, v = 90 m/s
The impulse experienced by the car is the change in linear momentum, calculated as follows;
J = ΔP = mv - mu
ΔP = m(v - u)
ΔP = 1500(90 - 55)
ΔP = 52,500 kg.m/s
Therefore, the impulse experienced by the car is 52,500 kg.m/s.
describe the shape of a screw
Answer:
The shape of a screw is a cylindric shape that grows in diameter at the top. Along the cylindar portion, it has horizantal ridges that circulate around the screw.
Hope this helps, brainliest pls :D