Newton’s second law of motion states that the acceleration of a person or object is proportional to the force applied to it and inversely proportional to its mass.
A "sound" is different than a "sound wave"
because
A. sound is how an animal (including humans) perceives a sound
wave
B. a sound wave can exist without creating a sound
C. sounds only exist within brains
D. all of the above
Answer:
sound is how an animal or human perceives a sound wave
__________is a semi-liquid paste that results from the mixing of partially digested food with gastric juice in the stomach.
Chyme is a semi-liquid paste that results from the mixing of partially digested food with gastric juice in the stomach.
When food enters the stomach, the gastric gland releases gastric juice, which the stomach's muscular wall thoroughly stirs into the meal. Chyme is the term for partially digested food that contains gastric juice.
Only a small amount of chyme is released into the small intestine at a time. The movement of chyme from the stomach into the small intestine is regulated by the pyloric sphincter.
In contrast, chyle is a milky body fluid made up of lymph and free fatty acids that have been emulsified (FFAs). While roughage refers to the inorganic fibre included in food, it is generated in the small intestine after the breakdown of fatty foods and taken up by lymph channels specifically known as lacteals.
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An organ pipe with a fundamental frequency f is open at both ends. if one end is closed off, the fundamental frequency will:______
The fundamental frequency will drop by half.
The lowest frequency of a periodic waveform is known as the fundamental frequency. In other words, it is the lowest frequency that can be produced by a certain instrument. The first harmonic of the instrument is another name for the fundamental frequency.
An open-ended organ pipe's basic wavelength is twice as long as the pipe itself. The fundamental wavelength is four times the pipe's length if one end is closed. The fundamental frequency decreases by half because the wavelength doubles when one end of the pipe is sealed off but the speed of sound remains unchanged.
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A device that assures the delivery of electric power without interruption is a(n)?
With e in volts per meter and t in seconds. at t = 0, the field is upward. the plate area is 4. 3 × 10-2 m2. for t > 0, what is the magnitude of the displacement current between the plates?
The magnitude of the displacement current between the plates is [tex]2.1*10^{-8} A[/tex]
Given,
A=4.3*[tex]10^{-2} m^{2}[/tex]
[tex]E=(4.0*10^{5})-(6.0*10^{4}t)\\[/tex]
[tex]i_{d} =ϵ_{0} *\frac{dϕ_{E} }{dt } =ϵ_{0}A\frac{dE}{dt}[/tex]
[tex]i_{d}[/tex]=[tex]ϵ_{0}[/tex]*A*[tex]\frac{d}{dt}[/tex][tex](4.0*10^{5})-(6.0*10^{4}t)[/tex]=[tex]-ϵ_{0} *A*6.0*10^{4}[/tex]
= -[tex](8.85*10^{-12})(4.0×10*^{-2})(6.0×10^{4})[/tex]=[tex]-2.1*10^{-8} A[/tex]
CurrentAn electrical charge carrier flow known as current often involves electrons or atoms lacking in electrons. The capital letter I is frequently used as a symbol for current. Amperes are the common unit and are denoted by the letter A. A coulomb of electrical charge moves past a certain place in one second as one ampere of current does. Franklin current or conventional current are terms used by physicists to describe how current flows from relatively positive to comparatively negative sites. Negatively charged electrons are the most prevalent charge carriers. They move in a somewhat good direction from relatively negative points.
With e in volts per meter and t in seconds. at t = 0, the field is upward. the plate area is 4. 3 × 10-2 m2. for t > 0, what is the magnitude of the displacement current between the plates?
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If your engine is flooded with gasoline, you should push the accelerator to the floor and hold for:_______.
You should push the accelerator all the way to the floor and hold for five seconds if your engine is flooded with gasoline.
To find the answer, we need to know about the flooded engine.
What is flooded engine?An engine that is flooded is one that has too much fuel in the vehicle and insufficient airflow.The signs of a flooded engine include difficulty starting the engine, car engine failure after only a few feet, black smoke, and unusual engine noise. We can solve the issue in different ways.In the right manner, push the accelerator or gas pedal all the way to the ground. You must open the car's throttle and let the engine's air flow before depressing the gas pedal.Thus, we can conclude that, You should push the accelerator all the way to the floor and hold for five seconds if your engine is flooded with gasoline.
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Light propagates from soda lime glass (n = 1.518) into pyrex glass (n = 1.473). determine the critical angle for this situation.
Light propogates from soda lime glass into pyrex glass of different refractive indices indicating a change in the medium which can be used to find out the critical angle.
The critical angle is the angle of incidence for which the angle of refraction comes out to be 90°. It is related to the refractive indices (Plural of refractive index) by the following relation:
Sini = 1/u, where u is the ratio of refractive index of medium 2 and medium 1
According to the question, Light propogates from soda lime glass (Medium 1, u1=1.518) into pyrex glass(Medium 2, u2=1.473), i.e. from a denser medium to rarer medium. So, the ratio of refractive index becomes u2/u1= 1.473/1.518=0.97
Putting the ratio in the above-mentioned formula,
∴ Sini = 1/0.97
i= 75.9°
Hence, the critical angle(i) for the given situation is 75.9°.
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1. The weight of body in air is 20N displaced 5N when emerged into water. The mass of body in water is ??
Answer:
5 N
Explanation:
Archimedes' principle indicates that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.
In this case, The weight of an object in air is 20N and it weighs x N when fully immersed in water. So, the weight of the water displaced is given as;
20 − x = 5
Therefore, the weight of the body in water is 5 N.
An object travels 12 m in the 1st second of travel, 12 m again during the 2nd second of travel, and 12 m again during the 3rd second. Its acceleration is therefore ___ m/s2.
0 m/s^2.
An object travels 12 m in the 1st second of travel, 12 m again during the 2nd second of travel, and 12 m again during the 3rd second. Its acceleration is therefore 0 m/s2.
Given
In First second object travels 12 m
in second second it travels 12 m
In 3rd second it travels 12 m
After observation, the object travels the same distance in the same amount of time, indicating constant velocity motion in a straight line with no acceleration.
Therefore acceleration = 0 m/s^2
What is acceleration?Rate of change of velocity with time, both in terms of speed and direction is known as acceleration. A point or object going straight ahead is accelerated when it accelerates or decelerates.To learn more about acceleration visit:
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What is the tension in the string if the turntable is held fixed, with the mass hanging from the pulley (i. e. , the mass is stationary)?
Weight of the mass is the tension in the string if the turntable is held fixed, with the mass hanging from the pulley
Weight is a force that acts at all times on all objects near Earth. The Earth pulls on all objects with a force of gravity downward toward the center of the Earth. Weight (symbolized w ) is a quantity representing the force exerted on a particle or object by an acceleration field, particularly the gravitational field of the Earth at the surface.
The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides. The tension force is directed over the length of the wire and pulls energy equally on the bodies at the ends.
The direction of tension is the pull which is given the name tension. Thus, the tension will point away from the mass in the direction of the string/rope. In case of the hanging mass, the string pulls it upwards, so the string/rope exerts an upper force on the mass and the tension will be in the upper side.
Tension will act opposite the the weight of the mass attached in order to maintain equilibrium .
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Two identical cars are driving toward one another and sounding their horns. You’re the driver of one of the cars. You measure your car’s horn to be sounding at 512 Hz, but you measure the horn of the other car to be sounding at 600. Hz. The speed of sound is 345 m/s. If you are traveling at 26.8 m/s (60 mph), how fast is the other car traveling?
The speed at which the other car is travelling is 27.71 m/s.
Speed of the second car
The speed of the second car is calculated as follows;
f₂ = f₁(v + v₁)/(v - v₂)
where;
f₂ is the frequency of second carf₁ is frequency of first carv is speed of soundv₁ is speed of first carv₂ is speed of second car600 = 512(345 + 26.8) / (345 - v₂)
600/512 = (345 + 26.8) / (345 - v₂)
1.1718 = 371.8/(345 - v₂)
345 - v₂ = 371.8/1.1718
345 - v₂ = 317.289
v₂ = 345 - 317.289
v₂ = 27.71 m/s
Thus, the speed at which the other car is travelling is 27.71 m/s.
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If the angular speed of a 1. 1-m baseball bat is 2. 0 rad/s, what is the tangential speed of the tip of the bat?.
Tangential speed of the tip of the bat is 2.2 m/s
Given:
angular speed = 2 rad/s
radius of ball = 1. 1-m
To Find:
tangential speed
Solution: Tangential velocity is the linear speed of any object moving along a circular path. A point on the outside edge of a turntable moves a greater distance in one complete rotation than a point near to the center.
The rate of variation in the matter's tangential velocity along a circular path is known as tangential acceleration.
A tangent line traced to the circle at the location of the object points in the direction of the velocity vector at any given time.
Here, v is Tangential speed t is the time ω is angular speed and r is radius
Vt = ω r
V = 2 x 1.1
V = 2.2 m/s
Hence the Tangential speed is 2.2m/s
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A student takes notes in class.
Sound Waves
I. Created by a vibration
A. Vibration: something that causes air molecules to move
back and forth quickly and steadily
II. Move through a medium
A. Solid
B. Liquid
C. Gas
Which line of her notes contains an error?
I
I A
II B
II C
The wrong statement is that sound waves created vibration Option A.
What are sound waves?Sound is a type of waves that moves in compressions and rare factions. This implies that sound is a mechanical wave. Recall that a mechanical wave is one that requires a material medium for propagation. Now we know that if we set the medium into vibration, that is when the sound waves begins to vibrate. That brings us to the idea that it is the vibration that causes the sound waves and not the sound waves that creates the vibration.
Thus, knowing that sound is a mechanical wave which moves through solids liquids and gas and that the vibration of the source of sound is what causes the air to vibrate, we conclude that the wrong statement is that sound waves created vibration Option A.
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Answer:
a
Explanation:
Which is an inertial reference frame (or at least a very good approximation of one)?
Earth is a good example of inertial frame of reference.
To find the answer, we have to know about the Inertial frame of reference.
What is Inertial frame of reference?In fact, an inertial frame of reference is one in which the law of inertia applies by definition. Whatever frame it is, it is not an inertial frame of reference if the law of inertia is broken in any manner. The Earth is a prime illustration of an inertial frame.Thus, we can conclude that, Earth is a good example of inertial frame of reference.
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Which statement about nuclear fusion is correct? A. Two hydrogen electrons become protons during fusion. B. Helium nuclei can fuse to form elements such as nitrogen.
C. The fusion reaction lasts for several hundred years. D. Large nuclei break apart to form smaller nuclei.
Answer:
A is the answer
Explanation:
Yes, Two hydrogen electrons become protons during fusion.
By far, the most common fusion reaction in nature combines two hydrogen atoms to make a helium atom.
Answer:
B
Explanation:
A no
B Yes ....can fuse all the way up to making Iron
C no
D no .... the opposite
What is the energy of a photon given that the radiation has a wavelength of 440 nm?
The energy of a photon given that the radiation has a wavelength of 440 nm will be .045 * [tex]10^{-17}[/tex] J
A photon is the quantum of electromagnetic radiation that describes the particle properties of an electromagnetic wave. The energy of a photon is given by the equation E = hf, where E is energy, h is Planck's constant, and f is frequency.
Forms of electromagnetic radiation like radio waves, light waves or infrared (heat) waves make characteristic patterns as they travel through space. Each wave has a certain shape and length. The distance between peaks (high points) is called wavelength
Energy = h*c / lambda
h= plank's constant = 6.626 * [tex]10^{-34}[/tex] J
c = speed of light = 3 * [tex]10^{8}[/tex] m/s
lambda = wavelength = 440 nm = 440 * [tex]10^{-9}[/tex] m
energy of a photon = 6.626 * [tex]10^{-34}[/tex] * 3 * [tex]10^{8}[/tex] / 440 * [tex]10^{-9}[/tex]
= 19.878 * [tex]10^{-26}[/tex] / 440 * [tex]10^{-9}[/tex]
= .045 * [tex]10^{-17}[/tex] J
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A rock with a mass of 17 kilograms is put aboard an airplane in new york city and flown to boston. how much work does the gravitational field of the earth do on the rock?
The amount of work done by the gravitational field of the earth do on the rock is 166.6d (J).
What is work done?Work is done when energy is transferred from one store to another.
Work is also done when a force causes an object to move.
The amount of work done by the gravitational field of the earth do on the rock is calculated as follows;
W = Fd
where;
F is gravitational force of the rockd is the displacement of the rockW = (mg)d
W = (17 x 9.8)d
W = 166.6d
Thus, the amount of work done by the gravitational field of the earth do on the rock is 166.6d (J).
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Briefly explain how einstein's special theory of relativity explains the perpendicular (right hand screw like) behavior of moving charges without recourse to invoking the concept of a magnetic field.
Einstein's special theory of relativity explains that the electric and magnetic fields are both can formulate together in mathematically.
It is given Einstein's special theory of relativity.
It is find the Einstein's special theory of relativity explains the perpendicular behavior of moving charges without recourse to invoking the concept of a magnetic field.
What is Einstein's special theory of relativity?
As we know that one charge creates a field and its that field that actually exerts a force on the other charge. Here we it gives the relationship of two fields like electric field and magnetic field and gives the formula for electromagnetic objects.
Special relativity fixes the problem by the points that the magnetic force in one frame of reference easily be an electric force in other and also some of the combination of them in a frame.
Thus, Einstein's special theory of relativity explains that the electric and magnetic fields are both can formulae together in mathematically.
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What is the maximum theoretical efficiency possible for an engine operating between 100°c and 400°c?
44.58% is the maximum theoretical efficiency possible for an engine operating between 100°c and 400°c
The ratio of useful work completed to heat produced is used to determine an engine's efficiency. is the task finished.
Please be aware that the phrase "work done" refers to the force applied to the clutch or driveshaft. This implies that the work produced by thermodynamic expansion is reduced by the friction and other losses.
Given
T1 = 100 +273 = 373K
T2 = 400 + 273 = 673 K
Formula for efficiency = (T2 -T1/T2) × 100
Put the values of T1 and T2
We get
Efficiency = (673 - 373 /673) × 100
Efficiency = 44.58%
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Calculate the cardiac output if your heart rate is 90 bpm and diostolic volume is 120 ml and in systolic volume is 30 ml.
The cardiac output is 180ml/min.
What is Stroke volume(SV)?
Stroke volume is the volume of blood pumped out of the left ventricle of the heart during each systolic cardiac contraction.SV = End diastolic volume (EDV) - End systolic volume (ESV)
SV = 120ml - 30ml
SV = 90ml
What is Cardiac Output?
Cardiac output (CO) is the blood volume the heart pumps through the systemic circulation over a period measured in litres per minute.CO = Stroke volume(SV) x Heart rate (HR)
CO = 90ml x 90bpm
CO = 180ml/min
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Ice cubes float in a glass of iced tea. why would cooling be less if the cubes were instead on the bottom of teh drink?
Ice cubes float in a glass of iced tea because due to a lack of convection, ice cubes will cool more slowly if they are on the bottom. Ice is denser than water at 4° C.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but the fluid motion is responsible for the bulk of the heat transfer.
Natural convection is caused by the fact that most fluids have a tendency to expand when heated, which causes them to become less dense and rise due to the increased buoyancy. Heat is transferred between two bodies by currents of moving gas or fluid, which is known as convection. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.
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Determine the shortest frequency of light required to remove an electron from a sample of ti metal if the binding energy of titanium is 3. 14 × 10^3 kj/mol
The shortest frequency of light required to remove an electron from a sample of ti metal if the binding energy of titanium is 3. 14 × [tex]10^{3}[/tex] kj/mol will be v = 0.47 * [tex]10^{37}[/tex] Hz
Binding energy, amount of energy required to separate a particle from a system of particles or to disperse all the particles of the system. Binding energy is especially applicable to subatomic particles in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions bound together in crystals.
Work function is defined as the minimum amount of energy needed to remove an electron from the atom. So, the minimum energy required to remove an electron is called the Work function.
plank's constant = 6.62 × [tex]10^{-34}[/tex] [tex]m^{2}[/tex] kg/s
Binding energy = 3. 14 × [tex]10^{3}[/tex] kj/mol
Energy = plank's constant * frequency
3. 14 × [tex]10^{3}[/tex] = 6.62 × [tex]10^{-34}[/tex] * v
v = 3. 14 × [tex]10^{3}[/tex] / 6.62 × [tex]10^{-34}[/tex]
v = 0.47 * [tex]10^{37}[/tex] Hz
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Officials want to reduce the possibility of oil leaks into bodies of freshwater drinking sources. therefore, the government insists that oil refineries undergo monthly inspections. for what reason would the government regulate monthly inspections at oil refineries? save the refinery money increase domestic oil production protect the public from pollution encourage foreign oil imports to drive down prices
Answer:
protect public from pollution
Explanation: got it right
The obsessive disinhibition form of a craving is the result of dysfunction in the ___________ neurotransmitter.
a. gaba
b. 5ht
c. da
d. op
The obsessive disinhibition form of a craving is the result of dysfunction in the 5ht neurotransmitter.
5HT neurotransmitter:One of the major neurotransmitters in mammals' nervous systems is 5-HT (also known as serotonin), which is well known for modulating key aspects of daily living like mood, sleep, social behaviors, learning, and appetite (Barnes and Sharp, 1999; Gingrich and Hen, 2001; Canli and Lesch, 2007).
The central and peripheral nervous systems contain a variety of G protein-coupled receptors and ligand-gated ion channels known as 5-HT receptors, 5-hydroxytryptamine receptors, or serotonin receptors. Both excitatory and inhibitory neurotransmission is mediated by them.
5-HT produces only inhibitory effects on excitatory or inhibitory transmission in the bed nucleus of the stria terminalis (BNST) [16] and the periaqueductal grey (PAG).
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A clock on a moving spacecraft runs 1s slower per day relative to an identical clock on earth. What is the relative speed of the spacecraft?
The craft is moving at a speed of v = 0.024c or around 7 million metres per second or 16 million miles per hour.
The time dilation factor is equal to 3600/3599 if we only want 3599 seconds of the craft's time to pass for every hour (3600 seconds) of Earth time. However, there is a connection as well.
γ = [tex]\frac{3600}{3599}[/tex] = Dilation factor
Also, γ = 1/ √[tex]1-v^{2}[/tex]/[tex]c^{2}[/tex]
which we can solve algebrically to yield,
[tex]\frac{v}{c}[/tex] = √1-1/γ[tex]^{2}[/tex]
we get,
[tex]\frac{v}{c}[/tex] = 0.024
v= 0.024c
Accordingly, the craft is moving at a speed of v = 0.024c, or around 7 million metres per second or 16 million miles per hour.
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If a giant molecular cloud is 59 pc in diameter and a shock wave sweeps through at 18 km/s, how long will it take the shock wave (in years) to sweep through the cloud?
The time it will take for the shock wave in years to sweep through the cloud is 3.2075 x 10⁷ years.
What is Velocity?Velocity is the directional speed of a moving object as an indicator of its rate of change in location as perceived from a certain frame of reference and measured by a specific time standard.
As it is known that one parsec is equal to 3.086×10¹⁶ meters. Therefore, the diameter of the molecular cloud is,
Diameter of the molecule = 59 pc
= 59 × 3.086×10¹⁶ meters
= 1.82074 × 10¹⁸ meters
= 1.82074 × 10¹⁵ kilometres
Given that the shock wave sweeps through at 18 km/s. And as it is known that velocity is the ratio of distance and time. Therefore, the time it will take for the shock wave to sweep through the molecule cloud is,
Velocity = Distance / Time
18 km/s = 1.82074 × 10¹⁵ km / Time
Time = 1.82074 × 10¹⁵ km / 18 km/s
t = 1.01152x10¹⁴ seconds
Since one year is equal to 31,536,000 seconds, therefore, the time in years is equal to,
t = 1.01152x10¹⁵ seconds / 31,536,000 seconds per year
t = 32,075,088.79 years
t = 3.2075 x 10⁷ years
Hence, the time it will take for the shock wave in years to sweep through the cloud is 3.2075 x 10⁷ years.
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What is the instantaneous value of a 10 ampere peak sine wave at 0, 30, 45, 60, and 180 degrees?
The instantaneous value of a sinusoidal waveform is the value of the alternating function at any particular instant.
The instantaneous value of a 10 ampere peak sine wave at 0, 30, 45, 60, and 180 degree are 0 A, 5 A, 7.07 A, 8.66 A, 0 A respectively.
From the question,
Instantaneous value is given as 10 A
The instantaneous value of a sine waveform is determined by the relation,
Instantaneous value = Peak value x sin θ
Substituting values in the above equation;
For 0°⇒
instantaneous value = 10 x sin 0°
= 10 x 0
= 0 A
For 30°⇒
instantaneous value = 10 x sin 30°
= 10 x (1/2)
= 5 A
For 45°⇒
instantaneous value = 10 x sin 45°
= 10 x (1/√2)
= 10 x 0.707
= 7.07 A
For 60° ⇒
instantaneous value = 10 x sin 60°
= 10 x (√3 / 2 )
= 10 x 0.866
= 8.66 A
For 180° ⇒
instantaneous value = 10 x sin 180°
= 10 x 0
= 0 A
Hence the instantaneous value of a 10 ampere peak sine wave at 0, 30, 45, 60, and 180 degree are 0 A, 5 A, 7.07 A, 8.66 A, 0 A respectively.
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Does the principle of optical reversibility hold for reflection as well as refraction? explain
Yes , principle of optical reversibility hold for reflection as well as refraction
Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.
The principle of reversibility of light states that light follows the same path if the direction of the travel of light is reversed.
This means that if a light ray travels from medium 1 to medium 2 and has angle of incidence and angle of refraction as i and r respectively, then if the light is incident from medium 2 at an angle r, then the angle of refraction in medium 1 will be i.
The principle of reversibility presumes that the attenuation of a light ray during its passage through an optical medium because of reflection, refraction, and absorption is not affected by a reversal of the direction of the ray.
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An object is thrown upwards with a speed of 16 m/s. how long does it take it to reach a height of 7.0 m on the way up? neglect air resistance.
Given:
initial velocity,u=16m/s
final velocity,v=0m/s
acceleration due to gravity,a=9.8 m/s²
height,h=7m
To find:
time taken,t
we can find the time taken by using second equation of motion as well as first equation of motion,so we use first equation of motion.
v=u+at
substitute the values,we get
0=16+(-9.8)×t
-16=-9.8×t
t=-16/-9.8
t=16/9.8
t=1.63s
Therefore,the time to reach the height of 7m is 1.63s
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Gold’s natural state has a shape and a define volume that is gold’s natural state
Answer:
Gold's natural state has a definite shape and a definite volume. Gold's natural state is solid.In nature, gold most often occurs in metallic form, alloyed with silver.