identify a coordinate system you could use to describe the motion of a girl swimming across a rectangular pool
If we imagine the rectangular pool to have a length L and a breadth b, the attached figure shows one of the several possible coordinate systems that can be used to locate the position of the girl at any point of time, thus enabling us to describe her motion.
Final answer:
A suitable coordinate system to describe a girl swimming across a rectangular pool is to use the long side as the x-axis and the short side as the y-axis. One can treat the swimmer's path as two-dimensional motion, analyzing her velocities in both x and y directions separately to predict her speed and swimming time.
Explanation:
To describe the motion of a girl swimming across a rectangular pool, we could set up a coordinate system by choosing the long side of the pool as the x-axis and the short side as the y-axis, with the origin (0,0) placed at one corner of the pool. If we observe the motion from above, we can treat the swimmer's path as two-dimensional motion.
In our coordinate system, the swimmer's position (x,y) changes over time as she swims across the pool. Since the pool is a controlled environment with no external forces like wind or currents, we can assume there's no acceleration in the horizontal x-direction (ax = 0). The swimmer might push off from one side of the pool to begin moving, in which case her initial horizontal velocity (Vx) could be constant throughout her swim if she maintains a steady pace.
To analyze the swimmer's motion, we would separately consider her velocity in the x-direction (Vx = v cos θ) and y-direction (Uy = v sin θ), where v is the magnitude of her velocity and θ is its direction relative to the x-axis. By mapping her position over time, we could use kinematic equations to predict her motion, such as her speed and the time taken to swim across the pool.
a ball is thrown up at a speed of 20 m/s.
what is the ball’s maximum height? using the “big three” equations
Given:
(Initial velocity)u=20 m/s
At the maximum height the final velocity of the ball is 0.
Also since it is a free falling object the acceleration acting on the ball is due to gravity g.
Thus a=- 9.8 m/s^2
Now consider the equation
v^2-u^2= 2as
Where v is the final velocity which is measured in m/s
Where u is the initial velocity which is measured in m/s
a is the acceleration due to gravity measured in m/s^2
s is the displacement of the ball in this case it is the maximum height attained by the ball which is measured in m.
Substituting the given values in the above formula we get
0-(20x20)= 2 x- 9.8 x s
s= 400/19.6= 20.41m
Thus the maximum height attained is 20.41 m by the ball
Which statement is true about physical changes and chemical changes? A. Chemical changes are not observable. B. Chemical changes always produce new substances. C. Physical changes can change physical and chemical properties. D. Physical and chemical changes cannot happen at the same time.
Answer:
The answer is B. Chemical changes always produce new substances.
Explanation:
In physical changes the appearance of substances is altered but not their nature, that is, the substances remain the same. In chemical changes a substance is transformed into new substances with different properties. Therefore the correct option is B. Chemical changes always produce new substances.
Select all of the norms that apply to the American Culture.
Question options:
1) A car must stop at a red light.
2) People should wear clothing while in public.
3) It is not acceptable to take items from a store without paying for them.
4) Women are expected to lower their heads and not make eye contact when speaking to men.
The answer to your question is,
1, 2, and 3.
-Mabel <3
Larry and Balky set up an experiment to analyze the motion of a marble as it rolled down an incline. They started the marble at the top of the ramp and set up photogates to collect data as the marble rolled down the ramp. Which graph format would allow Larry and Balky to calculate instantaneous velocity using slope? A) Velocity on the y-axis, time on the x-axis B) Distance on the y-axis, time on the x-axis C) Time on the y-axis, distance on the x-axis D) Velocity on the y-axis, distance on the x-axis
Answer:
Option B
Explanation:
The instantaneous velocity = Change in position/Time taken
The slope of the graph should give instantaneous velocity.
Slope of a graph = Change in value of Y -axis / Change in values of X -axis
Comparing both the equations
Change in value of Y -axis = Change in position
Change in values of X -axis = Time taken
So position values should be on the Y axis and Time values should be on the X axis.
Distance on the y-axis and time on the x-axis.
So, option B is the correct answer.
Answer:
A
Explanation:
slope is calculated using rise over run
ryan is looking at investment opportunities as a cloud service provider. he wants to invest in a deployment-based cloud model that provides all services. which cloud computing model should he opt for?
a. community
b.communication
c.infrastructure
d.software
Answer : a. Community
Allows a system to be accessible by a group of organizations. It can be shared between several organizations. It may be managed by organizations or by the third party.
This should be chosen by Ryan, since this computing model is cost effective and best to share among companies and organizations.
Other options explained:
-Software model is accessible via a browser and multiple users can use it.
-Infrastructure model is based on providing services of computer architecture in a virtual environment
Answer:
A. CommunityExplanation:
Now consider a new situation: The ball is thrown upward from the ground with an initial velocity that takes exactly the same time tBA = tAB = 0.45 s to pass by the window, with the ball moving up rather than down. Consider the ball’s slowdown during this time: Let v ′ B be the ball’s speed (do not confuse the speed with the velocity) as it passes the window’s bottom on the way up and let v ′ A be its speed as it passes the window’s top, also in its way up. How does the ball’s slowdown ∆vup = v ′ B − v ′ A compare to its speedup ∆vdown on the way down? 1. ∆vup < ∆vdown if the mass of the ball is less than 0.1 kg and ∆vup > ∆vdown if the mass of the ball is greater than 0.1 kg 2. ∆vup < ∆vdown. 3. ∆vup = ∆vdown. 4. ∆vup > ∆vdown if the mass of the ball is less than 0.1 kg and ∆vup < ∆vdown if the mass of the ball is greater than 0.1 kg
Here since we know that
[tex]t_{BA} = t_{AB}[/tex]
this equation shows that there is no air resistance
so in that case the time taken by the object during it's accent must be equal to the time taken by object during decent
so if we are given that during the upward motion object passes the two points A and B then its change in speed is given as
[tex]\Delta v_{up} = v'_B - v'_A[/tex]
similarly if we take its downward motion then in that case
it will take same time to move through the two points
so we will have
[tex]\Delta v = a \Delta t[/tex]
so here we will have
[tex]\Delta v_{up} = \Delta v_{down}[/tex]
Sarah wanted to know the velocity of an airplane traveling from Houston to Dallas. After recording the distance (in miles) and time (in hours) it took to travel to Dallas, what other measurement does Sarah need to determine the airplanes velocity?
A) acceleration
B) direction
C) force
D) inertia
Answer:
Option B is the correct answer.
Explanation:
Velocity of a body = Displacement of the body/Time taken
Displacement and velocity are a vector. Both have direction and magnitude.
Displacement is generally distance with direction.
If we divide distance with time taken we will get speed of the airplane. Speed with direction is called velocity. So we need distance between Houston and Dallas, time taken by plane to travel from Houston to Dallas and direction of displacement from Houston to Dallas.
So we need direction.
Option B is the correct answer.
Ben and Jerry went for a drive. They decided to stop for a snack and have some ice cream. How fast did they drive on their way to the store?
A) 15 km/h
B) 30 km/h
C) 40 km/h
D) 60 km/h
Answer:
They are driving at the speed of 30 km/h
Explanation:
From the graph it is clear that,
Total distance covered by Ben and Jerry, d = 60 km
The distance of 60 km is covered in 2 hours.
We have to find how fast they drive on their way to the store i.e their speed. We know that,
[tex]speed=\dfrac{distance}{time}[/tex]
[tex]s=\dfrac{60\ km}{2\ h}[/tex]
[tex]s=30\ km/h[/tex]
Hence, the correct option is (B) " 30 km/h ".
Three components of vector A and vector B are:
Ax = +7.6 Bx = −15.2
Ay = -9.2 By = ?
If vector B is a scalar multiple of vector A , what are the possible values of By ?
A. 18.4 only
B. all non-zero decimals
C. all positive decimals
D. all decimals greather than 9.2
I WILL GIVE BRAINLIEST TO WHO ANSWERS CORRECTLY
What is it called when an object has forces acting on it, but has zero velocity and zero acceleration?
A. Normal equilibrium
B. Force equilibrium
C. Dynamic Equilibrium
D. Static equilibrium
Answer:
Static Equilibrium
Answer:
D. Static equilibrium
Explanation:
A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres?
A) Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.
B) Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.
C) Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.
D) Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.
Answer: B - Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.
Explanation:
The rod is positively charged which means that it will repel positive charges (protons) and the rod will attract negative charges (electrons)
If you look at all the options that are given each one of them has a flaw, lets look at them one by one for better understanding of the concept:
(A) Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.
-Incorrect because protons which carry a positive charge CANNOT be attracted by the rod because as by the diagram the rod is also positively charged
(C) Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.’
Incorrect because sphere B has protons and not electrons as we can see it in the diagram given below.
(D) Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.
Incorrect because protons cannot move from sphere B to the rod since the rod is positively charged and like charges always repel.
if your on edge its b fam! just took the unit test
As Jose develops a sense of industry (according to Erikson's theory), he will _____.
As Jose develops a sense of industry, he will feel confident in his abilities to achieve goals. According to Erikson's theory, there are 8 stage of psychological development of a human being. A child learn different ability in each stage of life. These 8 stage are:
Trust vs. Mistrust (age: 0- 1.5 yrs)Autonomy vs. Shame (age: 1.5- 3 yrs)Initiative vs. Guilt (age: 3-5 yrs)Industry vs. Inferiority (age: 5- 12 yrs)Identity vs. Role Confusion (age: 12- 18 yrs)Intimacy vs. Isolation (age: 18- 40 yrs)Generativity vs. Stagnation (age: 40- 65 yrs)Ego Integrity vs. Despair (age: 65+ yrs)So, between the age 5-12, a child possess stage of Industry vs. Inferiority. Industry means Competency or Successful in Skills. In contrary, Inferiority results due to failures. If a child is guided and encourage to learn, and praised by people, they develop a sense of pride or industry. But, if a child is not encourage or promote at this stage, a sense of inferiority develops.
A car travels 30.0 km to the south and then turns around and travels 20.0 km to the north in 1.5 hours time. What is the card total displacement ? What is the cars average velocity?
Displacement = distance and direction from start-point to end-point.
That's 10km south.
Velocity = displacement / time
That's 6.67... km/hr south.
A car has a mass of 900 kg and a truck has a mass of 1800 kg. In which of the following situations would they have the same momentum?
The car travels at twice the velocity of the truck.
The car and truck travel at the same velocity.
The truck has a negative acceleration.
The car has a positive acceleration.
a) since force = mass * acceleration
f= 900 * 0 (because constant speed = 0 acceleration)
similarly b) f = 0
Answer:
The car travels at twice the velocity of the truck.
Explanation:
As we know that momentum is defined as the product of mass and velocity
so here we know
mass of the car = 900 kg
mass of the truck = 1800 kg
now let say that the speed of car = [tex]v_1[/tex]
speed of truck = [tex]v_2[/tex]
so if the momentum of car and truck is same
[tex]900 v_1 = 1800 v_2[/tex]
[tex]v_1 = 2 v_2[/tex]
so we can say that car will move with double the speed of truck
When a ball is throw into the air , Its _____ energy is lowest at the top of its arc.
kinetic energy is the answer
If your parents were going through a divorce and you needed to talk to someone, who would be the best professional to see?Clinical psychologistcounseling psychologistsocial psychologistdevelopmental psychologist
psychologist counseling would be the correct answer I believe
Answer:
Clinical psychologist counseling.
Explanation:
Divorce is very difficult time for any family and for the children. Divorcing spouse can be benefited by the psychologist or mental health professional at that difficult time.
It is very helpful for the spouse and children to talk about relations as well as emotions at that time. This will give the person a very effective way to deal up the situation, anger and frustration.
Which student correctly identifies a similarity and a difference between vector quantities and scalar quantities?
A) Adam
B) Binyam
C) Carlita
D) Dante
As per the question there are two physical quantities i.e scalar quantity and vector quantity.
A scalar is a physical quantity which requires only magnitude.It does not require any direction for it's complete specification.For instance we may take distance travelled,speed etc.
Unlike a scalar quantity,a vector quantity requires both magnitude as well as direction for it's complete specifications.For instance we may take displacement which is the shortest distance between two points,the velocity which is the speed in a given direction.
Hence a vector and scalar is differentiated by direction.
As per the question,the correct option will be the third option i.e C.
Carlita is right.As per her, both vector and scalar have magnitude,but only vectors have direction which is also true.
What hypothesis best explains why tanning occurs?
here is my answer hope this helps you out allot UVA radiation is what makes people tan. It penetrates to the lower layers of the epidermis, where they trigger cells called melanocytes
A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter. we can conclude that the hornet's wings must push on the air with force components that are
Since hornet is revolving with frequency 1 round per second
Time period of hornet is given by
[tex]T = 1 s[/tex]
Also the diameter of the circular path is 12 cm
so here we can say that its constant speed will be given as
[tex]v = \frac{2 \pi r}{T}[/tex]
[tex]v = \frac{2\pi * 0.06}{1}[/tex]
[tex]v = 0.377 m/s[/tex]
now the centripetal acceleration of the hornet is given as
[tex]a_c = \frac{v^2}{R}[/tex]
[tex]a_c = \frac{0.377^2}{0.06}[/tex]
[tex]a_c = 2.37 m/s^2[/tex]
so it will have its centripetal acceleration towards the pop as 2.37 m/s^2
so the force on its wing has two components one is towards the pop which will give the hornet centripetal acceleration while other component will counter balance the weight of the hornet
Answer:
down and backward
we can determine the velocity of a wave when given the frequency and the
a. amplitude
b. Equilibrium
c. trough
d. wavelength
Hello.
The answer is: D. wavelength
This is correct because frequency x wavelength = speed
Have a nice day
Answer:
d. wavelength
Explanation:
The velocity of a wave is product of its wavelength and frequency. Frequency refers to the vibrations per second and wavelength is the distance between two successive troughs(highest point of wave) or crests(lowest point of wave). Since frequency is already given we need wavelength of the wave to find out its velocity. The velocity is independent of its amplitude (intensity).
Moira is drawing the electric field lines around a pair of charges. One charge is positive, and the other charge is negative.
How should she draw the field lines?
a)away from each charge and meeting in the middle
b)away from each charge and curving away from one another
c)away from the positive charge and toward the negative charge
d)away from the negative charge and toward the positive charge
The best answer is B. If you curve them away, they have a less tendency to be attracted to the pair of charges and would stay around the pair instead of interacting with them.
Answer:
b
Explanation:
2. A truck speeds up from a velocity of 6 m/s to 14 m/s in 4 seconds. What is the trucks acceleration? SHOW YOUR WORK
3. A car starts from rest and reaches 15 m/s in 2.5 seconds. What is the acceleration of he car? SHOW YOUR WORK
4. A resident throws a bag of full trash over the balcony of their third floor apartment. What happened to the distance between the jumper and the bridge in each picture taken? PLEASE SHOW YOUR WORK
#2
As it is given here
initial speed is
[tex]v_i = 6 m/s[/tex]
After 4 seconds the final speed is
[tex]v_f = 14 m/s[/tex]
so here we can use the formula of acceleration using kinematics
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{14 - 6}{4}[/tex]
[tex]a = 2 m/s^2[/tex]
so here it will accelerate at 2 m/s^2 rate.
#3
As it is given here
initial it starts from rest
[tex]v_i = 0 m/s[/tex]
After 2.5 seconds the final speed is
[tex]v_f = 15 m/s[/tex]
so here we can use the formula of acceleration using kinematics
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{15 - 0}{2.5}[/tex]
[tex]a = 6 m/s^2[/tex]
so here it will accelerate at 6 m/s^2 rate.
#4
i think question is not correct as in first line it is saying about a bag of trash and then in next line it is asking for the position of Jumper and bridge.
The Sun is stable because the force of gravity is balanced by the thermal pressure created by the reactions in its core. The Sun will remain stable
A) As long as the outer surface of the Sun remains solid
B) As long as there is a sufficient source of energy within the Sun.
C) As long a the planets continue orbiting the Sun
D) As long as the gravity of Jupiter does not act on the Sun
--------- 5.5 billion years
Ron hits his golf ball but is disappointed when it doesn't follow the course to the left. What does Newton's First Law of Motion say about the travel of an object?
The golf ball will travel in a straight path unless changed by an external force.
Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Hope you do well:)
2. How far will a bird have traveled in 13 seconds if it maintained a speed of 31 m/s?
3. Ian walks 2 km to his best friend’s house, then walks 0.5 km to the library. He then makes a 2.5 km walk home. The entire walk took him 3 hours. What is his average speed in km/h?
4. A truck speeds up from a velocity of 6 m/s to 14 m/s in 4 seconds. What is the truck’s acceleration?
5. A car starts from rest and reaches 15 m/s in 2.5 seconds. What is the acceleration of the car?
6. A resident throws a bag full of trash over the balcony of their third-floor apartment. What will happen to the acceleration of the trash bag as it passes the second and first floors?
#2
speed of bird = 31 m/s
time = 13 s
since here bird maintains its speed to be constant
so here the distance traveled is given by
[tex]d = v*t[/tex]
[tex]d = 31 * 13 [/tex]
[tex]d = 403 m[/tex]
so bird will travel 403 m distance while maintaining its speed to be constant
#3
average speed is the ratio of total distance covered and total time
here Ian walk 2 km then 0.5 km and then 2.5 km so the total distance is given as
[tex]d = d_1 + d_2 + d_3[/tex]
[tex]d = 2 + 0.5 + 2.5[/tex]
[tex]d = 5 km[/tex]
total time of his full motion is
[tex]t = 3 hours[/tex]
so the average speed of the motion is
[tex]v = \frac{d}{t}[/tex]
[tex]v = \frac{5}{3} = 1.67 km/h[/tex]
so here average speed of Ian is 1.67 km/h
#4
Initial speed of the truck is 6 m/s
after 4 s interval of time
final speed of the truck is 14 m/s
so the acceleration is rate of change in velocity
so it is given as
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{14 - 6}{4}[/tex]
[tex]a = 2 m/s^2[/tex]
so here truck accelerated with 2 m/s^2
#5
Here car starts from rest so its initial speed is 0
after 2.5 s interval of time
final speed of the car is 15 m/s
so the acceleration is rate of change in velocity
so it is given as
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{15 - 0}{2.5}[/tex]
[tex]a = 6 m/s^2[/tex]
so here car accelerated with 6 m/s^2
#6
a bag full of trash is dropped from the balcony
Here we can say when bag is in air
the net force on the bag is only due to its weight
so here we can use Newton's II law to find the acceleration of bag
[tex]F = ma[/tex]
[tex]mg = ma[/tex]
[tex]a = g = 9.8 m/s^2[/tex]
so here bag will have constant acceleration during its whole motion as we can see that there is no change in the force and hence its acceleration always remains constant
Jason makes a graphic organizer for insulators and conductors and wants to add the following labels to it.
Label 1: Lacks free electrons
Label 2: Aluminum
In which regions should Jason place each label?
A) Label 1: X
Label 2: Y
B) Label 1: Z
Label 2: X
C) Label 1: X
Label 2: Z
D) Label 1: Z
Label 2: Z
Jason should place the regions in:
C) Label 1: X
Label 2: Z
Answer: C) Label 1: X
Label 2: Z
Explanation: Conductors are those substances which conduct electrical current easily because of the presence of free electrons whereas Insulators do not conduct electrical current as they do not contain free electrons. Some common examples of conductors are copper, aluminum, gold, and silver. Some common examples of insulators are glass, air, plastic, rubber, and wood.
Label 1: Lacks free electrons must be placed in the area marked X as they correspond to insulators.
Label 2: Aluminum is an example of conductor and thus must be labelled in area marked by Z.
Area Y corresponds to semiconductors which have properties intermediate to conductors and insulators.
A chemical property of copper is its what?
1 point
A. density
B. reactivity
C. color
D. melting point
Chemical properties are based on the ability or inability of the substance to produce new substances. Copper's malleability, color, luster, and thermal and electrical conductivity are contrasted with its ability to react with concentrated nitric acid and silver nitrate. Copper has a melting point of 1083.4 +/- 0.2°C, boiling point of 2567°C, specific gravity of 8.96 (20°C)
so its D
question answered by
(jacemorris04)
A chemical property of copper is its reactivity. The correct option is B
What is Chemical properties ?Chemical interactions or chemical transformations are described by a substance's chemical properties. The term "reactivity" describes a substance's capacity to interact chemically with other chemicals, such as acids or oxygen. For instance, copper can react with some acids to produce copper salts and with oxygen to produce copper oxide, which is why it eventually takes on a distinctive green patina when exposed to air.
Therefore, The correct option is B. A chemical property of copper is its reactivity.
Learn more about Chemical properties here : brainly.com/question/28308645
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Assume that a coffee maker, a vacuum cleaner, a toaster, and an electric drill were all used for one hour. Which uses the most energy in that time?
The answer is: A toaster
As we have four different equipment then for house hold system we know the default power of all
Coffee maker = 1400 W
Vacuum Cleaner = 700 W
Toaster = 1800 W
Electric Drill = 1000 W
now the energy consumed will be given as
[tex] Energy = Power * time[/tex]
here time is same for all that is for 1 hour we used all components
so here maximum energy will be consumed by the component which will have maximum power
So answer must be Toaster which is having maximum power of 1800 W
Study the scenario.
A toy car is pushed across the floor with a force of 4 N to the right. There is 1 N of friction acting on the car to the left.
What is the net force acting on the car?
0.25 N
5 N
4 N
3 N
Answer:
The net force acting on the car is 3 N.
(d) is correct option.
Explanation:
Given that,
Force = 4 N to the right
Friction force = 1 N to the left
We need to calculate the net force acting on the car
According to the question,
When a toy car is pushed across the floor with a force then the normal force applied to the right and the frictional force applied to the left on the car.
Then, the net force = normal force - frictional force
Using formula of net force
[tex]F_{net}=F-F_{k}[/tex]
[tex]F_{net}=4-1[/tex]
[tex]F_{net}=3\ N[/tex]
Hence, The net force acting on the car is 3 N.