Câu 2 : Một vật dao động điều hòa với phương trình : x = 5cos(4πt – π/3) (cm)
a. Xác định : li độ cực đại, chu kỳ, tần số, pha ban đầu của vật ?
b. Xác định li độ của vật tại thời điểm t = 0 và t = 2 (s)

Answers

Answer 1

Li độ cực đại x=A=5 cm

Chu kỳ T= [tex]\frac{2\pi }{4\pi }[/tex] = 0.5s

Tần số f= 1/T = 2Hz

Pha ban đầu = -π/3

x(0) = 2.5cm

x(2)= 2.5cm


Related Questions

plz help i will mark brainlyist.
describe how gravitational force is related to mass and distance
compare the magnitude and range of the four basic forces—gravitational, electromagnetic, weak nuclear and strong nuclear

Answers

Answer:

please mark me brainliest

Explanation:

Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.

The Four Fundamental Forces of Nature are Gravitational force, Weak Nuclear force, Electromagnetic force and Strong Nuclear force. The weak and strong forces are effective only over a very short range and dominate only at the level of subatomic particles. Gravity and Electromagnetic force have infinite range.

what is the law of conservation of Momentum?​

Answers

Law of conservation of momentum answer

Answer:

Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant

Name the type of forces involved in the following situations:
a) A rolling ball stops after covering some distance.
b) A magnet attracts a piece of iron.
c) Every object in the universe is attracted to each other.

Answers

Answer:

a. Frictional force

b. Magnetic force

c. Gravitational force

Answer:

frictional force

magnetic force

gravitational force

hope this helps!

Which term describes the repeated arrangement of the same molecule? (1 point)
O molecular model
O atoms
O bonds
o extended structure

Answers

The term which best describes the repeated arrangement of the same molecule is: D. extended structure.

An atom can be defined as the smallest unit which comprises the matter that forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter and as such determines (defines) the structure of a chemical element.

Generally, atoms are typically made up of three (3) distinct particles and these are;  

Protons.Neutrons.Electrons.

In Chemistry, a molecule can be defined as a group of two or more atoms that are chemically bonded together by means of shared electrons and represents the smallest fundamental unit of a substance or chemical compound.

Basically, when the same molecule are arranged repeatedly it is typically referred to as an extended structure.

In conclusion, the term which best describes the repeated arrangement of the same molecule of a chemical compound or substance is an extended structure.

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Schrodinger's cloud model for electrons is an alternate theory to Bohr's orbit model. True or False

Answers

Answer:

it's true...

Explanation:

hope it helps you


Please help what is the mass ??
•358.20 g
•358.3 g
•358.30 g
•358.2 g

Answers

Answer:

The answer is 358.2 g.

Help would be very appreciated :)

Answers

Answer:

c. is the answer i think

Explanation:

Answer:

d. is the the naswer I'm sure with it and not much sure but it would be ryt option

Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
Metals have low electronegativity, so they are conductive because they pass charges easily.
An attraction between a positive charge and a negative charge is created.
O The bonds can shift because valence electrons are held loosely and move freely.
OTwo metals bonded together are going to be more conductive than a metal bonded with a nonmetal.

Answers

Answer:

The bonds can shift because valence electrons are held loosely and more freely

Explanation:

Please give brainliest if you can,have a good day<3 :)

Answer:

The bonds can shift because valence electrons are held loosely and move freely.

Explanation: got it right

A student drops a feather off the top a building. The feather averages 1.5m/s while
fluttering to the ground.
Determine all unknowns.

Answers

The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object

The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag

The reason the above selected parameters are the correct unknowns is as follows;

The known parameter;

The speed of the feather the student drops off the building's top = 1.5 m/s

The required parameter;

The unknown parameters

Method;

Determine the terminal velocity parameters of the feather

The terminal velocity, [tex]\mathbf{V_t}[/tex], of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation

[tex]Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]

Where;

[tex]\mathbf{V_t}[/tex] = Terminal velocity = The constant speed of the feather

m = Mass of the feather

g = Gravitational acceleration

ρ = Air density

A = The feather's projected area

[tex]C_d[/tex] = Drag coefficient

The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, [tex]\mathbf{V_t}[/tex];

Plugging in [tex]\mathbf{V_t}[/tex] = 1.5 m/s gives;

[tex]V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]

Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;

The mass of the featherThe density of air at the locationThe feather's projected areaThe drag coefficient

Learn more about terminal velocity here:

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What is the economical application of change of state of matter

Answers

Answer:

Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again.

the distance between neha and diya's house is 200 km. a car take 2 hours to cover this this distance. find the speed of the car.

Answers

Answer:

27.8m/s

Explanation:

V= d/t

S. I unit of distance (displacement) is m

S. I unit of time is seconds

V= d/t

V = (200 x 1000)m / (2 x 60 x 60)s

V= 27.8 m/s

define about the different types of silk found around the world

Answers

Answer:

In short, there are four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk. Mulberry silk contributes around as much as 90% of silk production, with the mulberry silkworm generally being regarded as the most important.

Q=U+pV solve for p please

Answers

Answer:

Q = U + pv

Q - U = pv

(Q - U) / v = p

Which information about an atom can a period number give you?(1 point)

how many energy levels it has

the number of valence electrons it has

how many bonds it will make

the ionic charge it forms

Answers

Answer:

How many energy levels it has

The period to which an atom belongs can tell how many energy levels it has.

The period table of an element are categorised into horizontal rows (periods) and vertical columns (groups).

Each elements falls under a particular row (i.e period) and column (i.e group).

The group number talks about the number of valence electron(s) in the outermost shell of the atom while the period number talks about the number of energy levels (or number of shells) the atom has.

This is the most reason why elements in the same group have the same number of valence electron(s) while elements in the same period have the same number of energy levels

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How long would it take a runner to go 5000 meters at a speed of 5 meters per second.

Answers

Distance=5000mSpeed=5m/s

[tex]\\ \sf\longmapsto Speed=\dfrac{Distance}{Time}[/tex]

[tex]\\ \sf\longmapsto Time=\dfrac{Distance}{Speed}[/tex]

[tex]\\ \sf\longmapsto Time=\dfrac{5000}{5}[/tex]

[tex]\\ \sf\longmapsto Time=1000s[/tex]

True or false: the largest planet in the solar system is saturn

Answers

False. Jupiter is the largest planet in the solar system.

Answer:

nope! it's actually Jupiter

Explanation:

Jupiter is your answer

every morning Tom walks along a straight road from his home to a bus stop,a distance of 160 meters.The graph shows his journey on one particular day?

Answers

Answer:

Tom walked until he was 100 metres from his home. Then, he realised that he had dropped his homework, so he turned around and went 60 metres to pick it up again. He again turned back and started to walk faster to get to the bus stop on time. He got to the bus stop 100 seconds after leaving his home and waited for the bus.

Explanation:

The acceleration of a particle is given by a = c1 + c2v, where a is in millimeters per second squared, the velocity v is in millimeters per second, and c1 and c2 are constants. If the particle position and velocity at t = 0 are s0 and v0, respectively, determine expressions for the position s of the particle in terms of the velocity v and time t.

Answers

The expression for the position of the particle in terms of velocity and time is given as, s = vt

The given expression:

[tex]a = c_1 + c_2v[/tex]the unit of a = mm/s²the velocity, v = mm/sc₁ and c₂ are constantthe position of the particle at time, t = 0, is s₀ and v₀

To find:

The expression for the position s of the particle in terms of the velocity v and time t

Determine the value of the constants from second equation of motion given as:

[tex]s = vt + \frac{1}{2}at^2\\\\substitute \ the \ given \ value \ of \ a\\\\s = vt + \frac{1}{2}(c_1 + c_2v)t^2\\\\s = vt + \frac{1}{2} c_1 t^2 + \frac{1}{2} c_2vt^2\\\\divide \ through\ by \ t^2\\\\\frac{s}{t^2} = \frac{v}{t} + \frac{1}{2} c_1 + \frac{1}{2} c_2v\\\\multiply \ through \ by \ 2\\\\\frac{2s}{t^2} = \frac{2v}{t} + c_1 + c_2v\\\\when \ t = 0\\\\0 = 0 +c_1 + c_2v\\\\c_1 + c_2v = 0\\\\from \ the \ original \ equation;\\\\s = vt + \frac{1}{2} (c_1 + c_2v)t^2\\\\[/tex]

[tex]s = vt + \frac{1}{2}(0)^2\\\\s = vt[/tex]

Thus, the expression for the position of the particle in terms of velocity and time is given as, s = vt

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Pls answer this quastion
A ____________ is the smallest functional and structural unit of all living organisms.

An ___________ is any living thing that carries out its own life processes.

____________ was the first to describe cells. He looked at the bark of a cork tree under a microscope.

Why are most cells small?
Cells are small because their size is __________ by their outer barrier.
As the cell grows, they will require _______ nutrients and produce ______ waste products.
If cells get too large, they cannot take in ________ nutrients or get rid of enough wastes.
The __________to _________ ratio of a cell is the ratio of the outer surface to the cell’s volume.
The ________ the cell, the ________ this ratio.

What is cell theory?
The cell theory lists three basic characteristics of all cells and organisms.
________________________________________________________
________________________________________________________
________________________________________________________

Notable scientists:
Robert Hooke was the first to describe cells. He looked at the bark of a cork tree under a microscope.
_____________________ was the first to describe living cells.
_____________________ concluded that all plants are made of cells
_____________________ determined that all animal tissues are made of cells
_____________________ proposed that cells could form only from the division of other cells
Which theory does this fall under? ______

______________ organisms
Multicellular organisms
Made up of one cell
Made up of _____ than one cell
The single cell must carry out all life functions
These organism have _____________ cell functions

Describe the differences between the two types of cells.


Prokaryotes
Eukaryotes
_____________________
_____________________
_____________________
DNA is found in the __________________
_____________________
_____________________
_____________________
DNA is found in the _____________________

Answers

Answer:

1. Cell

2.Cells

3.Robert Hooke

Cell
Animal
Cell
The surface area to the volume is smaller as the cell get larger

14 km = m on conversions using a ladder method​

Answers

Using the metric units kilometer (km) and meter (m), as seen in the picture of the ladder method example. So, the answer would be 14km = 14000m

what do you think the benefits of nuclear energy are​

Answers

Low-carbon energy source Small Carbon footprint Answer to energy gap  Reliable and cost-effective.

The benefits of nuclear energy should involve less energy cost, accurate, release zero emissions of carbon, cost-effective, etc.

The information related to nuclear energy is:

It is to used for nuclear reactions in order to generate electricity.Nuclear power could be received from nuclear fission, decay, and its reactions.The majority of electricity should be generated via nuclear fission of both uranium &  plutonium for nuclear power plants.

Therefore we can conclude that The benefits of nuclear energy should involve less energy cost, accuracy, release zero emissions of carbon, cost-effective, etc.

Learn more about nuclear energy here: brainly.com/question/2240073

Critical Thinking If there is a difference
between a substance's atomic number and
its atomic mass, which measure must be the
larger number?

Answers

mass number is the amount of protons plus the amount of neutrons in an atom while atomic number is just the number of protons, therefore the mass number would be greater.

a heat engine gives out 400J of heat energy as the useful work.calculate the energy given to it as input if its efficiency is 40%?​

Answers

Answer:

E(efficiency) = E(out) / E(in)

.4 = 400 J / E (in)

E (in) = 1000 J

Heat input : 1000J

What is efficiency of a heat engine ?

The efficiency of a heat engine  is defined as the ratio of work done by the heat engine absorbed per cycle.

Given : work output = 400 J

          Efficiency = 40 % = 0.4

          heat input = ?

Efficiency = work output / heat input

                0.4 = 400/heat input  

heat input : 1000J

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#SPJ2

what occurs at the end of a negative cell if an electric cell is placed in a closed circuit?​

Answers

1. Current means flow of electrons and electrons are negative charged and so are attracted to the positive end of the battery and repelled by the negative end.

2. When battery is connected in a circuit that lets the electron flow through it, they flow from negative to positive.

3. When negative terminal of cell is connected to other negative terminal of the cell in a particular circuit then, current will not flow in circuit as electrons cannot flow from negative to negative terminal.

Slove these problem physics ​

Answers

Answer:

element name = neon

no of proton = 10

no. if neutron = 9

atomic no. = 10

atomic weight = 20.17179u

it lies in group 18 and period 2

it is nonmetal because it is a noble gas .

hope this helped you ☺️

You push a shopping cart for fun with a force of 60N. If the shopping cart has a mass of 12kg, what is the
acceleration of the cart?

Answers

Answer:

[tex]\huge\boxed{\sf a = 5 \ ms^{-2}}[/tex]

Explanation:

Given:

Force = f = 60 N

Mass = m = 12 kg

Required:

Acceleration = a = ?

Formula:

F = ma

Solution:

Rearranging formula

a = F / m

a = 60 / 12

a = 5 ms⁻²

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

~AH1807Peace!

5.
1
Shown above is a wire that is carrying current in a magnetic field. The magnetic field
is coming out the plane of the page.
What is the direction of deflection of the wire?
A) Upwards
B) Downwards
C) To the left
D) To the right

Answers

Answer:

The direction of defliection of the site to the left I think ..

Physical Science Essential Question: How can the scientific process be used to help us investigate and understand natural phenomena? Elaborate: Challenge students to pretend they are on the scientific journey to develop a vaccine to stop the zombie apocalypse and they need to design an experiment as a result of working in a laboratory. Ask the students to write 2-3 paragraphs describing what they would test and why might this be important in science and the real world. They might need to include the following terms: Experimental design
Test variable
•Outcome
•Control variable
•Hypothesis
•Testable
•Graphs and charts

Answers

Answer:

It C 100% bc i alrweady learn this

1. Review the data collected in the lab and explain the movement of the cart relative to the reference point(starting point). Be sure to mention how far from the origin the cart gets in each time interval.

2. Review the data collected in the lab and determine the relationship between the position of the car relative to the reference point and the amount of time in each time interval in other words as time goes by how does the position change?

3. For this response he will show your work on calculating the speed of the car during the lab remember you are used to change and slope equation or (y^2-y^1)/(x^2-x^1).
Now let’s make connections to the data table the horizontal variable is the time which we will represent with t and the vertical variable is position which we will represent with an x using this we can rewrite the equation above to the following
(final position - initial position)/
(final time - initial time)

Answers

When the data of the position and time are available, the velocity which is the ratio of change in position to change in time which is the same as the slope of the graph of the data can be calculated. For the car, we have;

1. The car moves progressively further as the time interval increases

2. The relationship between the position of the car and the time interval is that the car moves approximately 0.02 units of distance for each change in time of 0.05

3. The speed of the car is 0.398

The reason for arriving at the above values are as follows:

1. From the given data, we have that the cart moves progressively further from the start for each time interval increase, such that the cart moves progressively further from the origin in each time interval increases

[tex]\begin{array}{|c|c|} \mathbf{ Time} & \mathbf{ Position}\\2.2&0.8963\\2.25& 0.9164\\2.3 & 0.9375\\2.35 & 0.9581\\2.4 & 0.9759\end{array}\right][/tex]

2. From the given data, we have;

At time t = 2.2, the position = 0.8963

At time t = 2.25, the position = 0.9164

The change in position for a change in time from 2.2 to 2.25 is, Δx = 0.9164 - 0.8963 = 0.0201

Similarly, for the change in time from 2.25 to 2.3, which is a change of 0.05 seconds, we have;

Δx = 0.9375 - 0.9164 = 0.0211

The next interval is 2.3 to 2.35, Δx = 0.9581 - 0.9375 = 0.0206

Therefore, the change in the distance from the origin increases by approximately 0.02 for each increase in tome by Δt = 0.05 seconds

3. The slope equation is presented as follows;

[tex]Slope = \dfrac{y_2 - y_1 }{x_2 - x_1}[/tex]

The speed of the car is given by the slope of the distance time graph, where;

The horizontal variable, x, is the time, t (x = t)

The vertical variable, y, is the position, x (y = x)

Based on the given assignment of the variables to the x, and y, variables, we have;

[tex]Slope = Speed = \dfrac{y_2 - y_1 }{x_2 - x_1} = \dfrac{x_2 -x_1}{t_2 - t_1} = \mathbf{\dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time}}[/tex]

Plugging in the values in the table, we have;

[tex]Speed = \dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time} = \mathbf{\dfrac{0.9759 - 0.8963 }{2.4 - 2.2}} = 0.398[/tex]

The speed of the car = 0.398

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How many bones does the baby have and why does the baby has more bones than the older ones

Answers

Answer:

300

Explanation:

when the baby are born then they would have 300 bones but when they grow they would have 206 cause when they grow that 94 bones would convert into different kind of proton and energy I guess

330 the bones will grow until they become one if that makes sense.
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