Answer:
Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.
Explanation:
Answer:
in a given direction it is a speed of something
Explanation:
velocity tells how much distance is covered by an object in other words we can tell the quickness of motion
(6) A brick, with a mass of 4.0 kg., is placed on a horizontal surface. A
force of 15 N is needed to
push this brick towards the west at a constant velocity.
(a) What is the magnitude of the frictional force? Explain your answer.
(b) What is the magnitude of the normal force? Explain your answer
(c) Determine the value of the coefficient of sliding friction between the
brick and the
surface.
Answer:
(a) 15 N
(b) 39.2 N
(c) The coefficient of sliding friction is 2.61[tex]\bar 3[/tex]
Explanation:
The given parameters are;
The mass of the brick = 4.0 kg
The nature of the surface on which the brick rests = Horizontal
The force needed to move the brick from rest = 15 N
(a) Given that the body is not accelerating, the force applied = The frictional force = 15 N
Which can also be expressed as follows;
The magnitude of the frictional force = The force needed to push the brick to move from rest and move with a constant velocity = 15 N
(b) The magnitude of the normal force = The force acting at right angles to the surface opposite in direction and equal in magnitude to the weight of the brick, so as hold the brick and prevent it from passing through the surface. which is given as follows;
The weight of the block = The magnitude of the normal force =The mass × The acceleration due to gravity = 4.0 × 9.8 = 39.2 N
The magnitude of the normal force = 39.2 N
(c) The frictional force, F = [tex]\mu _k[/tex] × Normal force
Where;
[tex]\mu _k[/tex] = The coefficient sliding friction
By substituting the known values gives
15 = μ × 39.2
[tex]\mu _k[/tex] = 15/39.2 = 2.61[tex]\bar 3[/tex].
Which state of matter, solid, liquid, or gas is the most important for the survival of human beings and why?
Please answer ASAP
And write 6 sentences why.
Thanks.
Answer:
Gases
Explanation:
The most important state of matter for the survival of human beings is the gaseous state.
Gases are one of the most important state of matter. They are the bulk composition of the atmosphere and they condition many climatic phenomenon.
To humans beings, gases are vital for the following reasons,
Humans breathe in oxygen for their cellular respiration without which energy cannot be produced by the body. Also, plants on which human beings depends on produce their food using gases to manufacture their own food.True or false? wet soil is easily picked up by the wind and carried away. question 4 options: true false
No, it is not true that wet soil is easily picked up by the wind and carried away.
A strong wind rolls and lifts large volumes of soil and dust particles carrying them away and depositing them at some distant place.
In geology, we study that wind has the ability to carve the earth's surface through erosion and weathering processes.
However, wind can not pick up and carry only dry and lightweight particles of soil and dust.
It can not carry wet soil or heavy particles like rocks, wet sand, pebbles, and sediments from one place to another.
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Since the particles of liquids are able to slide past each other into different locations they have ______.
a. no definite volume
b. definite volume
c. definite shape
d. no definite shape
the amount of gravitational force exerted on each other between two objects depends on their
Answer:
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled.
S The intensity of a sound wave at a fixed distance from a speaker vibrating at a frequency f is I. (a) Determine the intensity that results if the frequency is increased to f' while a constant displacement amplitude is maintained.
The intensity that results if the frequency is increased to for while a constant displacement amplitude is I = (pv'²s²v)/8π²
What do you mean by the term amplitude?The amplitude of a periodic variable is a measure of its change over a single period (such as a period of time or space). The amplitude of an aperiodic signal is its magnitude relative to a reference value. Amplitude has several definitions, all of which are functions of the magnitude of the difference between extreme values of a variable. In older texts, the phase of a periodic function is sometimes called the amplitude. Peak amplitude is commonly used in audio system measurements, telecommunications, etc. A measurand is a signal that oscillates above and below a reference value but is not sinusoidal. If the reference is zero, this is the maximum absolute value of the signal. If the reference is the mean (DC component), the peak amplitude is the maximum absolute difference from that reference.
I = 1/2 pw²s²v = (1/8π)pv²s²v
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Suppose all six equal-length strings of an acoustic guitar are played without fingering, that is, without being pressed down at any frets. What quantities are the same for all six strings? Choose all correct answers. (a) the fundamental frequency (b) the fundamental wavelength of the string wave (c) the fundamental wavelength of the sound emitted (d) the speed of the string wave (e) the speed of the sound emitted.
Only elementary wavelength of the string wave is same for all six strings that is choice (b) .
Harmonic, conjointly known as merely elementary wave, is outlined because the lowest frequency of a periodic wave. In music, the foundation is that the pitch of the note that's perceived because the lowest partial gift. The wavelength of sound is that the distance between the analog points of 2 ordered waves.a ) every note includes a totally different harmonic (notes E, B, G, D, A, E).
b) Correct. The wavelength depends solely on the chord length and boundary conditions and is that the same for all six strings.
c) Corresponds to the basic tone, since the basic wavelength of the radiated sound varies from string to string.
d) String wave rate depends on the mass density and tension of the string. All half-dozen strings square measure totally different, therefore the wave speed is additionally totally different.
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a circuit has 2.25 amps of current and a resistance of 4.00. what is the voltage difference across the circuit?
Answer:
2.25
Explanation:
2.25 - 4.00
2-4=2
25-00=25
= 2.25
2.25 - 4.00 = 2.25 because 2-4=2 and 25-00=25=2.25
The voltage difference across the circuit is equal to 9 V when 2.25 A current flows through the circuit.
What is Ohm's law?Ohm’s law states that the voltage difference across any conductor is directly proportional to the current flowing through that conductor. Assuming temperature and all the physical conditions remain constant.
Ohm’s law can valid only if the temperature remains constant. Ohm’s SI unit is rho (Ω), and the current raises the temperature.
The mathematical formula of potential difference provided by Ohm/s law is:
V = IR
Where V is the potential difference and R is the resistance and I the current flowing.
Given, the resistance of the circuit, R = 4 ohm
The current flowing through the circuit, I = 2.25 A
The potential or voltage difference across the circuit will be:
V = I × R
V = 2.25 × 4
V = 9 Volt
Therefore, the potential difference across the circuit is equal to 9 V.
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a longitudinal sound wave travels from left to right through the air in a room. in what directions do the air particles vibrate as the wave passes?
The air particles will vibrate both in rightward and leftward direction as the a longitudinal sound wave travels from left to right through the air in a room.
What is a sound wave?A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Pressure waves are produced when an object vibrates, such as a ringing phone, and these waves are known as sound waves. The surrounding medium's particles are disturbed by the pressure wave, and those particles disturb the particles next to them, and so on.
Like ocean waves, the disturbance's pattern causes outward movement in all directions. Usually in all directions and with decreased intensity as it gets further away from the source, the wave transmits the sound energy through the medium.
At least as far back as the first century B.C., people have believed that sound travels in waves. Both the Roman philosopher Boethius and the Roman architect and engineer Vitruvius proposed that sound might travel in waves. Galileo Galilei is credited as being the founder of the current science of sound (1564-1642).
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Question is On the picture
Answer:when the heat is absorbed by a system, the reaction is endothermic
Explanation:
a pencil "lead" is actually made of graphite.graphite is made exclusively of carbon atoms. which two terms best describes graphite? A. compound. B. mixture. C. pure substance. D. element
The answer is C, as it states it's made of ONLY carbon atoms, not any others.
The answer is also A, because Graphite is still considered a compound.
A pencil "lead" is actually made of graphite. graphite is made exclusively of carbon atoms. The two terms that best describe graphite are pure substance and element. The correct options are options (c) and (d).
Graphite is considered a pure substance because it consists solely of carbon atoms. It is not a mixture because it does not contain different types of atoms or compounds.
Additionally, graphite is classified as an element because it is composed of only one type of atom, carbon.
Therefore, the correct answer is C. pure substance and D. element.
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please help meeee
Spongebob blows a 4 N bubble in the ocean and it floats upwards. The buoyancy of the
bubble is 8 N and water resistance is 1 N. Draw a FBD and attach a picture,
Answer:
whichever teacher gave you this question is a legend
Explanation:
EASY QUESTION FOR HIGH SCHOOL TEENS SUPER EASY
Answer:
True
Explanation:
Which of the following is Ohm's Law?
I = V/R
V = I/R
R = I x R
V = R/I
Answer
v= 1/R mark me brainliest pls
What is the change in velocity of a 15 kg object that experiences a 5 N force for 0.3 seconds?
Hello!
Δv = 0.1 m/s
Use the equation F = m · a to solve for the acceleration:
5 = 15 · a
a = 1/3
The equation to solve for acceleration can be rewritten to solve for the change in velocity:
Δv / t = a
Δv = at
We are given the acceleration and time, therefore:
Δv = (1/3)(0.3)
Δv = 0.1 m/s
if a charged plastic rod is brought near an uncharged metal rod on an insulating stand, an uncharged metal ball near the other end of the metal rod is attracted to this end of the rod. explain the motions of charges that give rise to this force
The phenomenon that is occurring is depicted in fig. Induction can be used to provide an explanation for this. As seen in Fig., when a negatively charged plastic rod is pushed close to a metal rod that is initially unaltered, the metal rod's left end picks up positive charges while the right end will pick up negative charges as a result of induction. when the empty metal ball is brought close to the metal rod's right end. The ball's near face subsequently develops a positive charge as a result of induction, and this positive charge attracts the rod since opposite charges are attracted to one another.
Define Induction?Electromagnetic induction, often known as induction, is the technique of creating electrical current in a conductor by exposing the conductor to a fluctuating magnetic field. Because the magnetic field is thought to have induced the current in the conductor, it is known as induction.
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For an object sitting on a surface that has a maximum force of static friction
Fs, max and a normal force Fn, which equation can be used to calculate the
coefficient of static friction?
Answer:
D. μs = Fs/Fn
Explanation:
The static friction coefficient, is always less than 1, for this reason, the friction force will always be less than the force of the body weight.
Answer:
D is correct. I just did it!!
Explanation:
Need help on this one
Answer:
Inversly or Indirectly
Explanation:
the voltage (V) and inversely proportional to the resistance (R).
Hope it helps!
Help please!!!!!!
!!
Answer:
9
Explanation:
about
One strategy in a snowball fight is to throw
a snowball at a high angle over level ground.
While your opponent is watching this first
snowball, you throw a second snowball at a
low angle and time it to arrive at the same
time as the first.
Assume both snowballs are thrown with
the same initial speed 12.8 m/s. The first
snowball is thrown at an angle of 63◦
above the horizontal. At what angle should you
throw the second snowball to make it hit the
same point as the first? Note the starting and
ending heights are the same. The acceleration
of gravity is 9.8 m/s
2
.
The angle he should throw the second snowball to make it hit the same point as the first is 27⁰.
What is the range of a projectile?
The range of the projectile is the distance traveled by a projectile in the horizontal direction.
There is no acceleration in this direction since gravity only acts vertically.
The range of a projectile is given as;
R = u²sin(2θ) / g
where;
u is the initial velocity of the objectθ is the angle of projectiong is acceleration due to gravityR is the range of the projectileFor the range of a projectile the angle of projection is related in the following equation.
when the initial angle of projection = θ
new angle of projection so that it will have the same range = 90 - θ
new angle = 90 - 63⁰ = 27⁰
check;
sin(2 x 63) = sin(2 x 27) = 0.809
Thus, the angle he should throw the second snowball to make it hit the same point as the first is 27⁰.
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(Circuit) Which one of these is NOT a necessary component of a circuit?
Answer:
if you dont give me a question I can't answer sorry
An ion rocket engine produces 1 newton of thrust. What acceleration can it give to a space probe with a mass of 1000kg?.
By using the thrust force, the acceleration is 0.001 m/s².
We need to know about force to solve this problem. According to second Newton's Law, the force applied to an object will be proportional to mass and acceleration. Hence, it can be written as
F = m . a
where F is force, m is mass and a is acceleration
From the question above, we know that
F = 1 N
m = 1000 kg
By substituting the given parameters, we can calculate the acceleration
F = m . a
1 = 1000 . a
a = 1/1000
a = 0.001 m/s²
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Changes of state occur when there is a change in:
Thermal energy
Electromagnetic energy
Chemical energy
Electrical energy
30 POINTS!!! I WILL ALSO GIVE BRAINLIEST TO CORRECT ANSWERThe uniformitarian principle states that:
Catastrophic events very likely changed the earth's surface.
Slow processes of erosion and deposition created landforms.
Landforms were created by fast changes.
The earth was once completely covered with water.
Answer:
Option (C)
Explanation: According to the law of Uniformitarianism, the geological processes that is going on now, has undergone in the past and will be continued in the same way in the future too.
Due to this constant ongoing earth dynamic processes, in terms of millions of years, the previously exited landforms have undergone weathering and erosion, and subsequently deposition also has taken place, and gave the shape of the present existing landforms. These processes has occurred slowly and will be continued in the same way in the future also.
Thus, the correct answer is option (C).
what make molecules
Answer:
Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. ... The element helium is a one-atom molecule. I hope this helps :)
Answer:
atoms held together by chemical bonds
Explanation:
In a long, straight, vertical lightning stroke, electrons move downward and positive ions move upward and constitute a current of magnitude 20.0kA. At a location 50.0m east of the middle of the stroke, a free electron drifts through the air toward the west with a speed of 300 m/s . (c) Find the radius of the electron's pay
The radius of the electrons is 2.14 × 10⁻⁵ m.
A magnetic field, often known as a vector field, describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A force acting on a charge while it travels through a magnetic field is perpendicular to both the charge's motion and the magnetic field.
Electrons go downward and positive ions move upward in a long, straight, vertical lightning stroke, creating a current of magnitude I = 20.0 kA.
The speed of the electron through the air if v = 300 m/s at r = 50 m east from the stroke's center.
Let the magnetic force be F, and B be the magnetic field.
Counterclockwise horizontal arcs of field lines are produced by the upward lightning current.
Then,
[tex]B = \frac{\mu_{0} I}{2 \pi r}[/tex]
[tex]B =\frac{4\pi \times 10^{-7} \times 20 \times 10^{-3}}{2 \pi(50)}[/tex]
B = 8 × 10⁻⁵ T north by the right-hand rule.
Then the radius of the electron will be:
r = mv / qB
[tex]r = \frac{(9.11 \times 10^{-31}) \times (300)}{(1.6 \times 10^{-19})(8 \times 10^{-5})}[/tex]
r = 2.14 × 10⁻⁵ m
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TRUE OR FALSE? >:) FOR TEENS GRADE 7 ONLY
Answer:
true
Inertia. Sometimes this first law of motion is referred to as the law of inertia. Inertia is the property of a body to remain at rest or to remain in motion with constant velocity.
please give brainlist I actually needed it.
you would like to take a taxi to the airport. there are two local taxi companies. friendly’s cab company charges $2.60 plus $0.20 per one-sixth of a m
The system of linear equations representing the above situation are -
y = 1.17x + 2.60
y = 0.59x + 5
The graph plotted shows the point of intersection of two lines which is the common solution of this system of equations. (Graph is attached at the end).
We have two taxi services for a ride to airport.
We have to write the system of linear equations to represent the situation.
What are System of Linear equations ?In algebra, a system of equations comprises two or more equations and seeks common solutions to the equations.
According to the question, we have -
Assume the distance between your home and airport is x miles and the total fare is $y.
For friendly's cab company -
for [tex]$\frac{1}{6}[/tex] of a mile or 0.17 mile = $0.20
for 1 mile = $ (0.20/0.17)
for x miles = $ (0.20 / 0.17)x
Now, the following equation represents the charges scheme for friendly's cab company -
y = 2.60 + 1.17x
y = 1.17x + 2.60
For Anderson's taxi company -
for [tex]$\frac{1}{6}[/tex] of a mile or 0.17 mile = $0.10
for 1 mile = $ (0.10/0.17)
for x miles = $ (0.10 / 0.17)x
Now, the following equation represents the charges scheme for Anderson's taxi company -
y = 5 + 0.59x
y = 0.59x + 5
Hence, the system of linear equations representing the above situation are -
y = 1.17x + 2.60
y = 0.59x + 5
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[ The question given is not complete. The complete question in the image is attached below after the plotted graph]
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current.(ii) What is the direction of the field the current creates at a point on the wall outside the frame to the right? Choose from the same possibilities as in part (i).
The direction of the field the current creates at a point on the wall outside the frame to the right is horizontally towards you.
What direction is the electrical current moving?The current will flow from the bottom of the wire to the top if the magnetic field around a vertical electrical wire is counterclockwise in direction.
A magnetic field, a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. When a charge moves through a magnetic field, a force that is perpendicular to both its own velocity and the magnetic field operates on it.
A permanent magnet's magnetic field pulls on ferromagnetic materials like iron and draws or repels other magnets. Since the direction and strength of a magnetic field can vary depending on the location, it can be mathematically described by a function that gives each point a vector.
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Cici uses a long extension cord to plug a lamp into a wall outlet in the next room.
What effect will the extension cord have on the circuit?
O It will decrease the resistance of the circuit.
O It will increase the voltage of the outlet.
O It will increase the resistance in the circuit.
O It will decrease the voltage of the outlet.
Answer:
C - it will increase the resistance in the circuit
Explanation:
edge 2021
It will increase the resistance in the circuit will the extension cord have on the circuit. So, the correct option is C.
What is Resistance?Resistance is defined as the measure of opposition to the flow of current in an electrical circuit and is measured in ohms which is represented by the Greek letter omega (Ω). Ohm is named after Georg Simon Ohm (1784–1854), the German physicist who studied the relationship between voltage, current, and resistance.
Resistance is also defined as the ratio of the applied voltage to the current flowing through it. The resistance in the circuit will increases when the extension cord have on the circuit. It is represented as:
R = VI
where, R = resistance (Ohms, Ω)
V = voltage difference which is between the two ends of a resistor (Volts, V)
I = the current which flows through a resistor (Amperes, A)
Therefore, the correct option is C.
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