If a student rings a brass bell with a frequency of 100 Hz. The sound wave travels through brass, air, and glass, then the wavelength of the wave in brass would be 47 meters, therefore the correct answer is option D.
What is a sound wave?It is a type of mechanical wave composed of the disturbance caused by the movements of the energy. A sound wave travels through compression and rarefaction in an elastic medium such as air.
As given in the problem if a student rings a brass bell with a frequency of 100 Hz. The sound wave travels through brass, air, and glass, then we have to find out what is the wavelength of the wave,
The wave velocity = Frequency of the wave ×wavelength
4700 = 100 × wavelength
Wavelength = 4700 / 100
=47 meters
Thus, the wavelength of the wave would be 47 meters .
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How long will it take, in minutes, for a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A?
Answer:
e
Explanation:
It will take 74.07 minutes, for a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power =work/time
The mathematical expression for the power is as follows
P = VI
where P is the power
V is the voltage
I is current passing through the circuit
For a transformer to transfer 2.3 X 10^6 J of energy from a 120-V circuit to a 345-V circuit with a current of 1.5 A
Power on the delivery side of the transformer by using the above formula
P = VI
P= 345 V × 1.5 A
P= 517.5 watt
Power = electrical energy /time
517.5 watt = 2.3 X 10^6 J / time
time = 4444.44 seconds
=74.07 minutes
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A student is creating a table with properties of electromagnetic and mechanical waves.
Answer:
The property of the wave marked X is related to the source of the wave
Explanation:
The source of of origin of waves
Electromagnetic wave are waves that consists of varying electric and magnetic field that vibrate perpendicular to each other and to the direction of propagation of the wave and they are therefore transverse waves and transfer energy
Electromagnetic waves originate from the vibration of charged particles that gives off varying electric and magnetic fields
Mechanical waves are defined as waves that require a material medium such as air, water, metal, plastic, stretched leather, or wood to propagate
Mechanical waves originate from vibration of the particles of a medium
Sound waves which is a form of longitudinal mechanical waves that propagates by the vibration of the particles of a given medium about a point parallel to the direction of propagation of the wave.
1. List a similarity between magnetic force and electrical force.
Answer:
Both are attractive as well as repulsive.
Explanation:
(Like poles repel, like charges repel; unlike poles attract, unlike charges attract).
There are two types of charges that form electric fields: positive and negative charges. Magnetic fields are formed by charges and are related with two magnetic poles, north and south (but moving charges).
The attraction and repulsion of electric charges produce both electric and magnetic fields.
The force released by magnets when they attract or repel each other is known as magnetism. An electric force is the attracting or repulsive interaction between any two charged things.
Similarities are as follows:
There are two types of charges that form electric fields: positive and negative charges. Magnetic fields are formed by charges and are related with two magnetic poles, north and south (but moving charges).The attraction and repulsion of electric charges produce both electric and magnetic fields.For more information:
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How does the Doppler effect cause a siren's pitch to increase as it
approaches you?
A. Sound waves are spread out, increasing wavelength and
decreasing frequency.
B. Sound waves are pushed closer together, increasing wavelength
and decreasing frequency.
C. Sound waves are spread out, decreasing wavelength and
increasing frequency.
D. Sound waves are pushed closer together, decreasing wavelength
and increasing frequency.
When a car sounds its horn as it approaches and moves away from an observer, there is a change in pitch known as a Doppler shift. During the approach, the received frequency is higher than the emitted frequency. ]Thus, option B is correct.
What Doppler effect cause a siren's pitch to increase?You hear a fairly high-pitched sound, like an ambulance coming at you with sirens blazing. This is because the moving ambulance is squishing the sound waves in front of the car together.
A good illustration of the Doppler effect is this. Since the effective wavelength is reduced due to an approaching source moving closer throughout the sound wave's period while the wave's velocity remains constant, the pitch is increased. Similar to this, a sound source that is fading away will have a lower pitch.
Therefore, Sound waves are pushed closer together, increasing wavelength and decreasing frequency.
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Answer:B
Explanation:
A construction crane, like the one shown, has a power output of 1,500 watts. If it takes 200 seconds to lift the roof to the top of the building, how much energy will the crane use
Answer:7.5j
Explanation:
P=w/s
the question is in the photo. please help
Answer:
Its B for your question
Explanation:
its B hope it helps
awnser:
C
Explanation:
An object accelerates in the same direction as that of force applied
Which of Galileo’s discoveries were later used in Newton’s laws?
Select all that apply.
a moving object will keep moving if not stopped
the effect of gravity on different objects
the phases of the moons of Jupiter
the Sun being at the center of the Solar System
please help..
Answer:
a moving object will keep moving if not stopped
the sun being at the center of the solar system
Explanation:
Galileo is known for being the first person make a telescope, there fore being the first person to see that the sun is in the center of the solar system. he also came up with the theory that if something is pushed, it would keep moving until stopped by another force. For example, say you drop your pencil, it keeps falling until it hits the ground. That is exactly what Galileo did in his Leaning Tower of Pisa experiment and found that theory to be true.
Galileo’s discoveries were later used in Newton’s laws include the following
below:
A moving object will keep moving if not stoppedThe sun being at the center of the solar systemGalileo was a scientist which invented the telescope and used it to view the
center position of the Sun in the solar system.
He also proposed that if something is pushed, it would keep moving until
stopped by another opposing force. His discoveries were found to be true
and were later used in Newton’s laws.
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Will MARK BRAINLIST a only for correct answer
I need help ASAP
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Which of the following is true for sound waves?
-They require a medium
-They are unrelated to vibrations.
-They can travel in a vacuum
-They cannot travel through liquids
-None of the above
Answer:
Explanation:
They require a medium.
If you found my answer useful then please mark me brainliest.
Answer:
- They require a medium
Explanation:
Sound waves are, by definition, waves of vibrating matter. You need a medium like a solid, liquid or gas to transmit sound waves. A vacuum is space without matter, and so sound cannot be transmitted through it. Outer space is, for the most part, a vacuum, so that line from Alien rings pretty true:
"In space, no one can hear you scream."
Planet X has twice earths mass and three times earths radius. The magnitude of the gravitational field near planet X’s surface is most nearly.
Answer:
2 N/kg
- The explanation for it is quite complicated, especially to type it out but I hope this helps.
The magnitude of the gravitational field should be 2 N/kg.
Calculation of the magnitude of the gravitational field:Since Planet X has twice earths mass and three times earths radius.
So,
we know that
[tex]g = GM\div r^2[/tex]
here, G = gravitational constant
M = mass of the planet
r = radius of the planet
So,
[tex]g\div gx = (M1\div M2) \times (r2\div r1) ^{2}\\\\9.8\div gx = (1\div 2) \times (3\div 1) ^2\\\\gx = 2.18 m/s^2[/tex]
So it is nearly 2 N/kg
hence, The magnitude of the gravitational field should be 2 N/kg.
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WORTH 50 POINTSSSS!!!!!!!! don't lie either if you do I will report your answer and get my points back idc !!!!!!
This political cartoon summarizes proposed legislation to stop immigration into the United States through the use of
A. Income
B. Military force
C. Building a barrier wall
D. Educational requirements
Answer:
b
Explanation:
PLEASEE HELP ASAP !!!!! thank you so so so much!!!! *will give brainliest*
Answer:
Answer a) Force on A equal to force on B
Answer a) The electric field points to the left in the location A
Explanation:
12)
Recall that the magnitude of the electrostatic force is given by:
[tex]F=k\frac{q*Q}{d^2}[/tex]
therefore in magnitude it is the same for charge q than for charge Q.
(Answer a for the first problem - 12)
13)
Recall that the electric filed points outwards for a positive charge, therefore at the location of charge q, the field must be pointing towards the left.
James Bond is unconscious in a 1000kg car full of explosive on a very dangerous road. After starting from rest at the top of the hill (point A), the car reaches the flat (horizontal) part of the road. At the beginning of the flat(horizontal) part, Bond regains the consciousness and applies brakes. The car skids across the horizontal road while slowing. The car, full of explosive, stops just as it reaches the far edge of the 50 m flat (horizontal) part of the road. What constant breaking force would have to be applied for the car to make a safe stop in a horizontal distance of 50 m?
Answer:
F = 19600 N
Explanation:
After reading this interesting exercise, I think you are missing the diagram, but we are going to solve them assuming the height of the hill, point A of about h = 100m.
Let's start by using the concepts of energy, to find the speed at the bottom of the hill
Starting point. Point A highest part of the colima
Em₀ = U = m g h
Final point. Flat part.
[tex]Em_{f}[/tex] = k = ½ m v²
as they tell us that there is no friction, energy is conserved
Em₀ = Em_{f}
mgh = ½ m v²
v = √2gh
let's calculate
v = √ (2 9.8 100)
v = 44.27 m / s
Now we can use the scientific expressions, when it stops its speed is zero
v² = v₀² - 2 a x
0 = v₀² - 2ax
a = [tex]\frac{ v_{o}^2 }{2x}[/tex]
a = [tex]\frac{ 44.27^{2} }{ 2 \ 50}[/tex]
a = 19.6 m / s²
with this acceleration we use Newton's second law
f = m a
F = 1000 19.6
F = 19600 N
An object starts at position 12 on a horizontal line with a reference point of 0. What is the position of the object if it
moves 14 units to the left?
-26
-2.
ОООО
2
26
Answer:
Answer is -2.
Explanation:
I hope it's helpful!
Answer:
neg 2
Explanation:
If you act without reason or sound judgement, people will describe you as __________.
a
impressionable
b
irrational
c
inconsistent
d
inconsiderate
Answer:
irrational
Explanation:
Describe the energy of the skier at location W.*
At point W, potential energy is greatest and kinetic energy is least.
At point W, potential energy is least and kinetic energy is greatest.
At point W, potential energy and kinetic energy are the same.
Answer:
The description of the energy of the skier at point W is,
At point W, potential energy is greatest and kinetic energy is least
Explanation:
The given parameters are;
The highest point of the skier's path = Point W
The lowest point of the skier's path = Point X
The height of the peak after point X = Intermediate between point W and point X
The potential energy of the skier, P.E. = m·g·h
The kinetic energy of the skier, K.E. = 1/2·m·v²
The total mechanical energy of the skier, M.E. = P.E. + K.E.= Constant
Where;
m = The mass of the skier
g = The acceleration due to gravity = 9.8 m/s²
h = The height of the skier
v = The velocity of the skier
Therefore, the P.E. of the skier is highest at the highest point of the skier's path which is the point W, where h = Maximum
Similarly, the potential energy of the skier will be lowest at point X which is the lowest point on the skier's path
From P.E. + K.E. = constant, the kinetic energy will be least at point W, where the potential energy is highest.
Therefore, the description of the energy of the skier at point W is that the potential energy is greatest and kinetic energy is least.
If an electric circuit has 0 A of current running through it, then the
must be
Answer:
Voltage, Zero
Explanation:
If an electric circuit has 0 A of current running through it, then the ✔ voltage must be ✔ zero.
Answer:
Voltage, zero
Explanation:
Which two figures are used to
determine the average speed?
What determines the appearance of water?
A. Molecules are too tiny to see.
B. The way the water molecules move.
C. Large scale observations that can be made with the human eye.
Answer:
b
Explanation:
the different ways the molecules are arranged in the atom creates differ states of matter and different appearences.
In a balanced equation, the total number of atoms of each element on the reactant side is _ total number of atoms on the product side
Explanation:
In a balanced equation, the total number of atoms of each element on the reactant side is equal total number of atoms on the product side
. A car with a mass of 700-kg changes its speed from 10.0 m/s to 30.0 m/s in a displacement of 50.0 meters. Calculate the net force acting on the car during this time.
Answer:
5600N
Explanation:
Given parameters:
Mass of car = 700kg
Initial velocity = 10m/s
Final velocity = 30m/s
Displacement = 50m
Unknown:
Net force acting on the car = ?
Solution:
To find the force acting on a body, it is pertinent we know the mass and acceleration.
Force = mass x acceleration
Now;
Let us find the acceleration from the kinematics equations:
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the acceleration
S is the distance
30² = 10² + (2 x a x 50)
900 = 100 + 100a
100a = 800
a = 8m/s²
Therefore;
Force = 700 x 8 = 5600N
If she runs 3,223 meters each day and keeps this up for two weeks, how many miles will she have run
Answer:
28 miles
Explanation:
3,223 meters/day x 14 days = 45,122 meters
1 meter = 3.28 feet
45,122 meters = 148,000 feet
5280 feet = 1 mile
148,000 feet = 28 miles
You have a bottle of 1.7 Liters of happy water but no scale . Calculate the mass of the water. show units. "happy water" has a density of 1.1 g/cm^3
Im just putting questions from my friends quiz on here to see if u guys know
Answer:
1kg/ L
Explanation:
PLS ANSWER WITH EXPLANATION OR SOLUTION (WILL GIVE 50 PTS)
An aircraft carries a static charge of 0.75 C. It travels at 235 m/s perpendicular to a
1.9
×
10
−
4
T magnetic field. What magnetic force does an aircraft experience?
Answer:
[tex] \underline{ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}}[/tex]
Explanation:
[tex]since \: in \: this \: case \to \: \underline{ v }\: is \perp \: to \:\underline{ q} \\ then \: the \: magnetic \: force \: (F_m) \: is \: max = qvB \sin(90) \\ F_m = qvB \times (1) = qvB \\ hence \to \\ F_m = qvB \\ where \\ \: q = 0.75 C : v = 235m {s}^{ - 1} : B = 1.9 { \times 10}^{ - 4} T \\ therefore \to \\ F_m = 0.75 \times 235 \times 1.9 { \times 10}^{ - 4} \\ F_m = 176.25 \times 1.9 { \times 10}^{ - 4} \\ F_m = 0.0334875 = 3.35 { \times 10}^{ - 2} N \\ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}[/tex]
Learning Task 1: Determine what kind of carbon allotropes are the given pictures
below based on its different structural modifications. Write your answer in a
separate sheet of paper.
1.
2.
3.
4.
5.
6.
Answer:
1.C70
2.Fullerene
3.Lonsdaleite
4.Graphite
5.Diamond
6.Amorphous carbon
I hope this helps. thank you
Explanation:
The compound of an element is arranged in a manner in more than one different form.
The example of an allotrope is as follows:-
GraphiteDiamondThe allotropes which are shown in the image is as follows:-
C70 Fullerene Lonsdaleite Graphite Diamond Amorphous carbonHence, these are the allotropes.
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Which of the following is not a benefit of being multicellular?
we can't see multicellular animal with our naked eyes
A 900 kg vehicle moves around a curve with an incline of 20\circ∘ at a speed of 12.5 m/s. If the curve has a radius of 50 meters, what normal force [N] will the vehicle experience?
IN NEWTONS
Answer:
The normal force experienced by the car is approximately 8223.2 N
Explanation:
The question relates to banking of road where the centripetal force for the circular motion of the vehicle is provided by the horizontal component of the normal reaction
The mass of the vehicle that moves around the curve, m = 900 kg
The incline of the curve, θ = 20°
The speed with which the vehicle moves around the curve, v = 12.5 m/s
The radius of the curve, R = 50 meters
We have;
[tex]N \cdot sin(\theta) = \dfrac{m \cdot v^2}{R}[/tex]
Where;
θ = The angle of inclination of the road = 20°
N = The normal force experienced by the car
m = The mass of the car = 900 kg
v = The velocity with which the car is moving = 12.5 m/s
R = The radius of the curve around which the vehicle moves = 50 m
[tex]\therefore N = \dfrac{m \cdot v^2}{R \cdot sin(\theta)} = \dfrac{900 \times (12.5)^2}{50 \times sin(20^{\circ})} = 8223.1998754586828969046217875927[/tex]
The normal force experienced by the car = N ≈ 8223.2 N.
Why does the Moon orbit Earth?
a
There is magnetic attraction between the Earth and
the Moon
b
There is gravitational attraction between the Earth
and the Moon
с
There is chemical attraction between the Earth and
the Moon
d
There is mechanical attraction between the Earth
and the Moon
Answer:
B
Explanation:
Gravity, the attractive force between all masses, is what keeps the planets in orbit. Newton’s universal law of gravitation relates the gravitational force to mass and distance
The force of gravity is what gives us our sense of weight. Unlike mass, which is constant, weight can vary depending on the force of gravity (or acceleration) you feel. When Kepler’s laws are reexamined in the light of Newton’s gravitational law, it becomes clear that the masses of both objects are important for the third law, which becomes a3 = (M1+ M2) × P2. Mutual gravitational effects permit us to calculate the masses of astronomical objects, from comets to galaxies.
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock. What is the ideal mechanical advantage of Sergei's lever?
Answer:
m = 3.57
Explanation:
Given that,
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock.
We need to find the ideal mechanical advantage of Sergei's lever.
It is equal to the ratio of resistance arm to the effort arm. In terms of length it is given by :
[tex]m=\dfrac{d_2}{d_1}\\\\m=\dfrac{2.5}{0.7}\\\\=3.57[/tex]
So, the ideal mechanical advantage of the lever is 3.57.
Which model shows how an image appears to a person when they look through a concave lens?
A 20-kilogram child is riding on a 10-kg sled over a frictionless icy surface at 8.0 meters per second. Calculate the kinetic energy of the sled with the child.
Answer:
K = 960 J
Explanation:
Given that,
Mass of a child = 20 kg
Mass of a sled = 10 kg
Speed of child on sled = 8 m/s
We need to find the kinetic energy of the sled with the child.
The total mass of child and the sled = 20 kg + 10 kg
= 30 kg
The formula for the kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 30\times (8)^2\\\\K=960\ J[/tex]
Hence, the kinetic energy of the sled with the child is 960 J.