Answer:
[tex] { \tt{velocity = \frac{distance}{time}}} \\ \\ { \tt{velocity = \frac{2750}{10.5} }} \\ = { \tt{261.9 \: {ms}^{ - 1} }}[/tex]
Chapter 1
3.
The centre of gravity is usually located where
A no mass is concentrated.
B average mass is concentrated.
Cless mass is concentrated.
D more mass is concentrated.
Answer:
D. more mass is concentrated.
Explanation:
Gravity is considered to be a universal force of attraction which acts between all objects that has both mass, energy and occupy space. Therefore, it acts in such a way as to bring objects together.
Additionally, the gravity of earth makes it possible for all physical objects to possess weight.
Newton's law of universal gravitation states that the force of attraction (gravity) acting between the Earth and all physical objects is directly proportional to the Earth's mass, directly proportional to the physical object's mass and inversely proportional to the square of the distance separating the Earth's center and that physical object.
Center of gravity can be defined as the specific point where all of the weight of an object is concentrated.
Generally, all the objects found around the world all have a center of gravity.
Additionally, when an object is balanced so that a displacement lowers its center of gravity, the object is said to be in stable equilibrium.
The centre of gravity of a physical object is usually located where more mass is concentrated in the physical object or body.
However, the location of the centre of gravity is subject to change and as such doesn't always remain the same.
My second question for today :
Why do we ever have a blood moon?? What's the science behind it
Answer:
vhijko and eye rudiieidjdjddjjd
Explanation:
jdjdjdjdjfjofkd ruudoeksowkosksd and nkdeondjvndkxnfuvjfk
Write a hypothesis about the use of an object’s physical characteristics to determine its density. Use the format "if . . . then . . . because . . .” and be sure to answer the lesson question "How can the density of an object be determined?”
Answer:
If 2 objects have the same mass, then which object has a larger volume will have a smaller density
Explanation:
Because density is the object's mass divided by volume
que aceleración adquiere un cuerpo de 0.5 kg cuando actúa una fuerza n2
Q 2 A large circular field has a track along its inner boundary for conducting long distance sports events. The diameter XY of the track is 1 km. The following events were conducted.(use √ = 3.14 for calculations)
Event A- Fast walking along the diameter of the field.
Event B- A 15.7 km running race along the circular track.
Event C- A 25.12 km cycling race along the circular track.
(a) If the athletes walked from X to Y then, distance and displacement covered in Event A were
(i) Both 1.57km (ii) Both 1 km (iii) 1km and 1.57km respectively (iv) 1.57km and 1 km respectively.
(b)No of rounds required to complete Event B are
(i) 10 (ii) 2.5 (iii) 5 (iv)0.5
(c)If Pihu ran at an average speed of 3.14 km/h during Event B, then she would finish the race in
(i) 0.5hours (ii) 50mins (iii)500minutes (iv) 5 hours
(d) What should the average speed of cyclist Yousef be, so that he can complete Event C in 4hours?
(i) 6.28km/h (ii) 0.628km/h (iii) 12.56km/h (iv) 1.256km/h
Answer:
Explanation:
(a)
In event A , one has to walk along diameter of the field from X to Y.
In this event , walk is along a straight line , both displacement and distance covered will be same.
Distance = displacement = 1 km.
option ii is correct .
(b )
radius of circular track r = 0.5 km
length of track = circumference = 2π r
= 2 x 3.14 x .5 = 3.14 km
Length of running in event B is 15.7 km
No of rounds = 15.7 / 3.14 = 5
option iii is correct .
( c )
speed = length of race / time
time = length of race / speed
= 15. 7 km / 3.14 km /h
= 5 hours .
option iv is correct option.
(d)
In event C , length of race is 25.12 km
speed = length of race / time taken
= 25.12 km / 4 hour
= 6.28 km/h .
Option i is correct.
Answer:
(a) (ii)
(b) (iv)
(c) (i)
(d) (i)
Explanation:
diameter, XY = 1 km
Event A- Fast walking along the diameter of the field.
Event B- A 15.7 km running race along the circular track.
Event C- A 25.12 km cycling race along the circular track.
(a) When athletes walked from X to Y , the distance is equal to the displacement which is equal to the diameter = 1 km.
Option (ii).
(b) distance = 15.7 km
distance traveled by one round = 3.14 x 1 = 3.14 km
So, the number of round complete in B = 1.57/3.14 = 0.5
option (iv).
(c)If Pihu ran at an average speed of 3.14 km/h during Event B, then she would finish the race in
time, t = 1.57/3.14 = 0.5 hours
option (i)
(d) What should the average speed of cyclist Yousef be, so that he can complete Event C in 4hours?
Distance = 25.12 km
time , t = 4 hours
Speed = 25.12 / 4 = 6.28 km/h
Option (i)
why physics ought to be studied?
Answer:
The goal of physics is to understand how things work from first principles. ... Courses in physics reveal the mathematical beauty of the universe at scales ranging from subatomic to cosmological. Studying physics strengthens quantitative reasoning and problem solving skills that are valuable in areas beyond physics.
Making rough estimates of physical quantities is usefulA. So that you can see if the answer to a problem makes physical sense.B. Because we only use approximate numbers in problems.C. Because the laws we use are not exact, so using exact numbers is not crucial.D.So that you can compute answers doing simpler math.
Answer:
A. So that you can see if the answer to a problem makes physical sense.
Explanation:
Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.
An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).
This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.
Measurements refers to the process which typically involves the process of identifying and determining the dimensions of a physical object. The dimensions include important parameters such as width, height, length, area, volume, circumference etc.
In Science, making rough estimates of physical quantities is useful so that you can see if the answer to a problem makes physical sense.
For example, you could make a rough estimate of a storage tank and deductively determine whether or not it's in tandem with its physical size in reality.
health ,population and environment education is for the enrichment of quality of life,justify the statement
Answer:
hey !! here is a short and sweet answer to your question
=quality of life is directly determined by health ,education ,and life expectacy
=health Is a type of thing that gives employment to the person working in firm
hope u understand
Explanation:
Your new motorcycle weighs 2450 N.
What is
its mass in kilograms?
i understand the answer is 250kg because mass times gravity thing but why isn’t the answer negative cause gravity pulls down so wouldn’t be Negative answer not a positive answer
i was taught FW is always negative why isn’t it negative here
Answer:
Explanation:
The negative only matters reallly if you are dealing with a 2d system. I could even define down as positive and up as negative. However, usually you are taught that down is negative. It really doesn't matter because a force is a force. It is only given a direction relative to another force or vector direction.
Magnetic force between the north poles of two magnets is
Magnetic force between the north poles of two magnets is REPULSIVE
Answer:Repulsion or attraction
Explanation:The angle between the compass needle and geographic north is called the MAGNETIC DECLINATION.(see earth:the magnetic field of the earth ). The repulsion or attraction between two magnetic dipoles can be viewed as the interaction of one dipole with the magnetic field produced by other dipole.
1. Determine the magnitude of two equal but opposite charges if they attract one another with a force of 0.7N when at distance of 0.3m apart in a vacuum.
Answer:
q = 2.65 10⁻⁶ C
Explanation:
For this exercise we use Coulomb's law
F =[tex]k \frac{q_1q_2}{r^2}[/tex]
In this case they indicate that the load is of equal magnitude
q₁ = q₂ = q
the force is attractive because the signs of the charges are opposite
F = [tex]k \ \frac{q^2}{r^2}[/tex]
q = [tex]\sqrt{\frac{F \ r^2}{k} }[/tex]
we calculate
q = [tex]\sqrt{\frac{0.7 \ 0.3^2 }{9 \ 10^9} }[/tex]
q = [tex]\sqrt{7 \ 10^{-12} }[/tex]Ra 7 10-12
q = 2.65 10⁻⁶ C
What is physical measurement? in Science
Answer:
physical measurement comprises the measurement of objects, things, etc. and is concerned with the measurement of height, weight, length, size, volume etc.
Describe the advantages and disadvantage is of living in a floodplain
Answer:
:) :::::::::::::::::::::::::::::::))))
When a ray enters into air from glass slab
a) its wavelength decreases
b) it's wavelength increases
c) it's frequency increases
d) it's frequency decreases
Answer:
a ) Its wavelength decreases
Explanation:
When a ray enters into air from glass slab its wavelength decreases.
I have possess'd your grace of what I purpose:And by our holy Sabbath have I swornTo have the due and forfeit of my bond.If you deny it, let the danger lightUpon your charter and your city's freedom !You'll ask me, why I rather choose to haveA weight of carrion flesh than to receiveThree thousand ducats : I'll not answer that:But, say, it is my humour(1) Whom are these lines addressed to? What is the context in which theselines are spoken?(ii) What has Shylock sworn on oath ?
Answer:
1. These lines are addressed to Duke.
2. These lines show that Shylock is not willing to forgive the debt a merchant owes him, nor is he willing to justify why he demands that debt be paid, even if it seems cruel.
3. He swore by the Holy Sabbath, which is a holy day for him, who is a Jew. He swore he would get the debt money or a piece of the debtor's flesh.
Explanation:
The lines shown in the question above refer to "The Merchant of Venice" written by Shakespeare. In this story we are introduced to Antonio, a commercial who is very prejudiced against Jews, but when he needs money, he borrows from another merchant, Shylock, who is Jewish. Shylock agrees to lend money to Antonio, but determines the date that this money must be returned, in addition, Shylock states that he will lend the money if Antonio agrees that if this money is not paid by the specified date, Antonio will have to pay with half a kilo of flesh from his own body. Antonio agrees, but doesn't pay the money so Shylock goes after the flesh of Antonio's body and Duke tries to intervene because he thinks this is too cruel. At this point, Shylock speaks the lines shown in the question above, showing that he is not willing to change his mind.
numerical of science
Consider the stress-strain diagram shown here. Assume all four material samples (A-D) were originally the same size and shape. Identify the material with the highest yield strength:
Stress-strain diagram with 4 materials graphed.
A
B
C
D
Answer:
B
Explanation:
Stress-strain diagram with 4 materials graphed. The graph with maximum yield strength is B.
What is stress?Stress is defined as the force applied per unit area of cross-section. It is denoted by Sigma(σ). Its's unit is same as the pressure i.e. N/m².
Considering the stress-strain diagram shown here. Assumed all four material samples denoted as (A-D) were originally the same size and shape.
When a body is stretched by a tensile force, it stretches more and more until it reaches its elastic limit. There comes a point where the body no longer stretches. The change in stress is very less and the stress is greater at the yield point. The strength required up to the yield point is called as the yield strength. The body breaks while forming the neck of the bottle. This strength of any material is known as ultimate stress at break or ultimate tensile strength.
So, the material with the highest yield strength is B.
Thus, the correct option is B.
Learn more about Stress.
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#SPJ5
which electromagnetic wave has the highest frequency
Answer:
Gamma rays
Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.
To make a position-time graph, you plot position relative to the starting point on the y-axis against the corresponding_______on the x-axis
Answer:
time.
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, position, displacement, etc.
A graph can be defined as the graphical representation of data (informations) on horizontal and vertical lines i.e x-axis and y-axis respectively.
A position-time (x-t) graph is a graph of the position of an object against (versus) time.
To make a position-time graph, you should plot the values of the position of an object or body with respect to the starting point on the y-axis against the corresponding time on the x-axis.
Generally, the slope of the line of a position-time (x-t) graph is typically used to determine or calculate the velocity of an object.
An instantaneous velocity can be defined as the rate of change in position of an object in motion for a short-specified interval of time. Thus, an instantaneous velocity is a quantity that can be found by measuring the slope of a line that is tangent to a point on the graph.
In conclusion, the x - t graph also referred to as the position-time graph is used for determining the instantaneous velocity from the slope.
Longitudinal waves are produced by
What is an essential characteristic of an object in equilibrium?
1) zero velocity
2) zero acceleration
3) zero potential energy
4) zero kinetic energy
Answer:
2) zero acceleration
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
Mathematically, the motion of an object is described in terms of time, distance, speed, velocity, position, displacement, acceleration, etc.
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
Generally, an object is said to be in equilibrium when neither the energy possessed by the object not state of motion changes with respect to time. Thus, the vector sum of all the forces acting upon an object that's in equilibrium is zero.
In conclusion, an essential characteristic of an object in equilibrium is zero (0) acceleration because there's no change in its velocity with respect to time.
An image of a car with height of 14 cm occurred in the mirror which is located at a T-
intersection. If the car height is 140 cm and the radius of the curvature of the mirror is 60 cm,
how far is the car from the mirror?
helpp me!!!!!!
Answer:
The distance of car form the mirror is 330 cm.
Explanation:
height of object, h = 140 cm
height of image, h' = 14 cm
radius of curvature, R = 60 cm
focal length, f = R/2 = + 30 cm
Let the distance of image is v and the distance of object is u.
[tex]\frac{h'}{h}\frac{v}{u}\\\\\frac{14}{140} =\frac{v}{u}\\\\v =\frac{u}{10}[/tex]
Use the formula of focal length
[tex]\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\\\\\frac{1}{30}=\frac{10}{u}+\frac{1}{u}\\\\\frac{1}{30}=\frac{11}{u}\\\\u = 330 cm[/tex]
Which of the following is a mixture?
Động cơ của một ô tô thực hiện một lực kéo không đổi là F=4000N . Biết ô tô chuyển động đều với vận tốc 36km/h . Trong năm phutd công của lực kéo của động cơ là bao nhiêu
Answer:
The work done is 12 MJ.
Explanation:
The engine of a car exerts a constant traction force of F=4000N . Assume that the car is moving at a constant speed of 36 km/hr. In five minutes, what is the work done by the engine's traction?
Force, F = 4000 N
speed, v = 36 km/h = 10 m/s
time , t = 5 minutes = 5 x 60 = 300 s
Work done is given by
W = force x distance
W = 4000 x 10 x 300 J = 12 x 10^6 J = 12 MJ
A particle makes 800 revolution in 4 minutes of a circle of 5cm. find i. It's period ii. Angular Velocity iii. Linear Velocity iv. It's acceleration please with the formula stated clearly and the meaning of the symbols with accurate solutions you can snap and send it THANK YOU
Answer:
(i) The particle has a period of 0.3 seconds.
(ii) The angular velocity of the particle is a20.944 radians per second.
(iii) The linear velocity of the particle is 1.047 meters per second.
(iv) The linear acceleration of the particle is 21.933 meters per square second.
Explanation:
Statement is incomplete and have mistakes, complete and correct form is presented below:
A particle makes 800 revolutions in 4 minutes of a circle with a radius of 5 centimeters. Find (i) its period, (ii) its angular velocity, (iii) its linear velocity and (iv) its acceleration.
(i) The period of the particle ([tex]T[/tex]), in seconds, is the time taken to make a complete revolution:
[tex]T = \frac{4\,min \times \frac{60\,s}{1\,min} }{800\,rev}[/tex]
[tex]T = 0.3\,s[/tex]
The particle has a period of 0.3 seconds.
(ii) The angular velocity ([tex]\omega[/tex]), in radians per second, is determined by the following formula:
[tex]\omega = \frac{2\pi}{T}[/tex] (1)
[tex]\omega = \frac{2\pi}{0.3\,s}[/tex]
[tex]\omega \approx 20.944\,\frac{rad}{s}[/tex]
The angular velocity of the particle is a20.944 radians per second.
(iii) The linear velocity ([tex]v[/tex]), in meters per second, is calculated by the following formula:
[tex]v = R\cdot \omega[/tex] (2)
Where [tex]R[/tex] is the radius of the circle, in meters.
If we know that [tex]R = 0.05\,m[/tex] and [tex]\omega \approx 20.944\,\frac{rad}{s}[/tex], then the linear velocity of the particle is:
[tex]v = (0.05\,m)\cdot \left(20.944\,\frac{rad}{s} \right)[/tex]
[tex]v = 1.047\,\frac{m}{s}[/tex]
The linear velocity of the particle is 1.047 meters per second.
(iv) Since angular velocity is constant, linear acceleration of the particle ([tex]a[/tex]), in meters per square second, is entirely radial. Acceleration can be found by means of this expression:
[tex]a = \omega^{2}\cdot R[/tex] (3)
If we know that [tex]R = 0.05\,m[/tex] and [tex]\omega \approx 20.944\,\frac{rad}{s}[/tex], then the linear acceleration of the particle is:
[tex]a = \left(20.944\,\frac{rad}{s} \right)^{2}\cdot (0.05\,m)[/tex]
[tex]a = 21.933\,\frac{m}{s^{2}}[/tex]
The linear acceleration of the particle is 21.933 meters per square second.
If a lawn mower is pushed with a distance of 30 meters and 12N-m of work is exerted, calculate the force.
Answer:
Explanation:
W = FΔx so filling in:
12 = F(30) so
F = .4N
In a given chemical reaction the energy of the products is less than the energy of the reactants which statement is true for this chemical reaction
Group of answer choices.
A. Energy is absorbed in the reaction.
B. Energy is released in the reaction.
C. There is no transfer of energy in the reaction.
D. Energy is lost in the reaction.
Answer:
B. Energy is released in the reaction.
Explanation:
A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.
Basically, there are two (2) main types of chemical reaction and these include;
I. Endothermic reaction: it's a chemical reaction in which heat is absorbed
II. Exothermic reaction: it's a chemical reaction in which heat is liberated into the environment.
In Chemistry, all chemical equation must follow or be in accordance with the Law of Conservation of Mass, which states that mass can neither be created nor destroyed by either a physical transformation or a chemical reaction but transformed from one form to another in an isolated (closed) system.
Generally, energy is released in a chemical reaction when the energy of the products is less than the energy of the reactants and it is referred to as an exothermic reaction.
However, when the energy of the products is greater than the energy of the reactants, energy is absorbed and it is referred to as an endothermic reaction.
Where an electric field line crosses an equipotential surface, the angle between the field line and the equipotential is
Answer:
90 degree
Explanation:
Electric field line is vertical to the electric field line.
The angle between the field line and the equipotential where an electric field line crosses an equipotential surface is 90°
What is an electric field?This is a region of space around a charged particle, or between two voltages.
The angle between Electric field crosses an equi-potential surface is always 90 degrees. When the potential becomes constant,the negative potential gradient also becomes zero, hence necessitating the need for Electric field to be always normal with surface.
Therefore, the angle between electric field and equi-potential surface is 90 degrees.
Read more on Electric Field:
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what mean by expansion effect of heat
Answer:
Explanation:
-Cambio de temperatura
Al calentar un cuerpo la temperatura aumenta
Es el efecto más inmediato del calor, el aumento de la temperatura. Al calentar un cuerpo, es habitual, aunque no siempre, que el cuerpo aumente de temperatura. El aumento dependerá de la cantidad de calor que se suministra, del tipo de sustancia y de su cantidad.
-Dilatación
Cuando un objeto se calienta, su volumen aumenta. Este fenómeno se llama dilatación térmica. Por el contrario, cuando un objeto se enfría, su volumen disminuye, debido a la contracción térmica.
Cuando se calienta un cuerpo, además de cambiar de estado o variar su temperatura, también cambia su tamaño, se dilata.
Por ejemplo, los puentes no se construyen de una única pieza, sino que suelen presentar uno o varios cortes longitudinales, las llamadas juntas de dilatación. Si no existieran esas juntas, los cambios de longitud del puente entre el invierno y el verano o entre el día y la noche acabarían por romperlo.
La dilatación de un cuerpo dependerá del aumento de temperatura que experimente, de su tamaño y de la sustancia de que esté hecho. Cuanto más aumente la temperatura más aumentará su tamaño, lo mismo que cuanto mayor sea, mayor se hará.
Todos los cuerpos, ya sean sólidos, líquidos o gaseosos, varían su tamaño cuando intercambian calor con otro cuerpo.
-Cambios de estado:
Si una sustancia modifica el estado de sólido, líquido o gaseoso, se produce un cambio de estado. Un cambio de estado es una modificación en la forma en que se disponen las partículas que constituyen una sustancia.
El estado en que se encuentre un cuerpo depende de la presión a la que está sometido y de su temperatura. Para cambiar su estado se debe modificar alguna de estas variables, o ambas. Al elevar la temperatura de una sustancia sólida, aumenta la agitación de sus partículas.
Answer:
All forms of matter (solid, liquid and gas) undergo expansion on heating. When a solid is heated, the atoms gain energy and vibrate more vigorously. This results in the expansion of the solid. For a given change in temperature, the extent of expansion is smaller in solids than in liquids and gases. This is due to the rigid nature of solids.
Explanation:
Jennifer has a credit score of 450. Her bank recently approved her for a credit card. What will her interest rate be?
A. High, as her credit score is low, indicating that she is a high risk borrower
B. Low as her credit score is good
C. Big as her credit score is good
D. Low as she is a high risk borrower
Answer:
A
Explanation:
low credit score means its more risky to lend someone money
