Posts by Sarah

Total # Posts: 5,983

socail Studies
So what is the answer?

Physics
Can acceleration of object have a negative quantity ?

Physics
Calculate the velocity of a 6kg riffle that shoots a 0.025kg bullet at a speed of 615m/s.

Physics
Two vectors have a magnitude of 2.5km and 6.5km . Predict the maximum and minimum magnitude of their resultant vector

Physics
A snooker ball with a mass of 0.3kg moving at 2.5m/s collides with another ball of 0.2kg mass and moving in the same direction with a speed of 1.20m/s . Assuming the collision is elastic, calculate the speed and direction of each ball after collision.

Physics
A ball is thrown horizontally at 18m/s from the roof of a building lands 28metre from the base of the building. Calculate the height of the building.

Physics
vector A is 5.5cm and points 60°above the positive x-axis. Vector B is 6.5cm and points along thr negative x-axis. Calculate the magnitude and direction of the resultant of these two vectors.

Physics
A bullet is fired horizontally and penetrates into a block of wood. The block and bullet then move together after impact. Explain the total linear momentum and total kinetic energy of the system before and after the collision

Physics
A ball of mass 1.20kg falls vertically and hits a horizontal floor at 2.50m/s . The ball then rebounds upward at 10.00m/s . If the ball is in contact with the floor for 0.02 seconds, compute the average force exerted on the floor.

Physics
A projectile is shot horizontally at 34.5m/s from the edge of a 55.0metre building . Determine the height of the projectile from the ground after 2.0seconds .

English
In the story "The Lemon Tree Billiards House" Is the narrator trustworthy? Can we believe his story? Explain.

English
From the story "The Lemon Tree Billiards House", provide 2 examples of a humorous tone and explain why/how this is funny.

Math
Thank you so much So My equation would be: 500/180+x= 400/180-x And the answer that I get is: 20km/h. Is at correct?

Math
I'm not sure what you did. What is VA and VW?

Math
an airplane travels 500 km with the wind in the same time that it takes the airplane to travel 400 km against the wind. the average speed of the plane in still air is 180 km/h. what is the average speed of the wind? Airplane with wind: Distance: 500km Speed: 180+x Time: ...

Chemistry! urgent
what volume of gas at 40°C and 1.50 atm is necessary to react with 300 L of hydrogen gas measured at the same conditions? 2H2 (g) + O2 (g) --> 2H20 (g) 1.50 atm= 151.KPa How would I solve this? Because I can't use: PV = nRT I have pressure, temperature, r. There'...

Math,Calculus
The function’s value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency a. f’’>0 B. F’’<0 C.f’>0 D.f’<0

Chemistry
Okay thank you

Chemistry
Okay thank you

Chemistry
I'm not really sure how to do this. I've tried many ways and I can't get the right answer of 0.0569 mol/L H3PO4 100.0 mL of a solution containing 2.55g of potassium hydroxide is mixed with 100.0 mL of a 1.50 mol/L phosphoric acid solution. Will the resulting ...

Chemistry
Why are the hydrogen bonds of a certain molecule weaker in solution (with water as a solvent) than in a vacuum? I'm supposed to have three reasons, and so far all I can come up with is that the water lowers the activation energy required to form the bond and that the ...

Chemistry 20
Okay thank you so much. And yup you're right, methyl red is red is the only possible indicator. And yup that makes sense!

Chemistry 20
which of the following indicators would show an intermediate endpoint of color of orange: bromocresol green, methyl red, phenolphthalein or methyl violet? No clue how to do this. And what does it mean to show an intermediate endpoint. Please help

Chemistry
I've been given a table with the following information: Br-Br bonding energy (298 K): 192.807 kJ/mol Br2 vaporization energy: 30.91 kJ/mol boiling point of bromine: 332 K The question reads, "A chemist heats liquid bromine to 335K, and a gas forms. Is the change that ...

English
I'm writing a critical essay.and when we do say, mean and matter for our quote, the matter is outside of the text. So my thesis needs to be general but regarding to Macbeth's responses.

English
I'm writing a critical essay.and when we do say, mean and matter for our quote, the matter is outside of the text. So my thesis needs to be general but regarding to Macbeth's responses.

English
I need help doing a thesis for Macbeth by Shakespeare. I'm focusing on the character Macbeth and my theme is ambition. Intially: -He is shown as a loyal soldier who is kind (fill with the mill of human kindness) -He gets startled when the witches tell him his 3 prophecies...

Physics
It should be velocity, but if the question is assuming that direction doesn't matter, then the answer is probably speed. Displacement would be the area under the curve of a velocity vs time graph.

Chemistry
Just to make sure I'm on the right track here, is it correct to say that larger molecules have a higher heat of vaporization/condensation than smaller molecules? I figure that since larger molecules have stronger dispersion forces, it takes more energy for them to break ...

Chemistry
You'll want the overall charge of the compounds to be 0. For A, how can you balance +2 and -3 to make an overall charge of 0? For B, do you know how to find the charge of copper (II)? (Hint: it is in the name.)

Science
We know there are about 6.02 x 10^23 atoms in a mole, so convert the grams to moles and then multiply by Avogadro's number to find the number of atoms.

Chemistry - Liquid Methane?
"The planets Uranus and Neptune are so far from the Sun that temperatures are low enough for atmospheric methane, CH4, to condense and form clouds. How is it possible for methane, a nonpolar substance, to exist in this liquid state?" I want to say it's because ...

Chemistry
The question on one of my assignments says, "Explain why a thick layer of ice on the lake can support the weight of a person, but the liquid water cannot." I would assume it's because solids are solid and liquids are liquid, but I feel like they want a more ...

Math
A brick patio has the approximate shape of a trapezoid. The patio has 16 rows of bricks. The first row has a = 13 bricks and the 16th row has b = 28 bricks. How many bricks are in the patio?

Math
Going to bake 100 cookies. If 3 cups of flour will make 20 cookies. How much is needed for 100

Math
Never mind I got it

Math
I know that lmao I'm just looking for some help

Math
Explain It Use your design and analysis to write a website posting describing the process readers can use to make a string of pennant flags using any length string and any size square. Your posting should include the following: ? step-by-step instructions ? a formula that can ...

math
A credit card had an APR of 23.51% all of last year and compounded interest daily. What was the credit card's effective interest rate(EIR) last year? Show your work.

math
thank you

math
so in a rhombus all sides are equal ?

math
a property of rhombi that is not a property of parallelograms

math
so the answer is 9,4?

math
M(1, 7) is the midpoint of PQ¯¯¯¯¯ . The coordinates of point P are (?8, 3) . What are the coordinates of point Q?

math
THANK YOU !

math
i know that this deals with the midpoint formula and stuff like that

math
please help im really struggling Point A is located at (2, 6) and point B is located at (18, 12). What point partitions the directed line segment ? AB¯¯¯¯¯ ? into a 2:3 ratio?

History
does modern day war coverage present the same opportunity to present an interpretation of event that this artist illustration did of conflict in sudan ?why or why not?

math
an ostrich at the zoo that is 140 pounds. how many ounces does the ostrich weigh?

math
If I have a line of best fit, y = -3.0681x + 287.7095 is -3.0681 the slope? And is 387.7095 the y-intercept? And what exactly does that y-intercept mean? That's where that line crosses the y-axis?

algerbra
p=2L + 2w find L when P=24 and W=4

Spanish
Would someone be able to help me translate this into English? I'm not sure it makes sense. Tan bomba vas a ser? De donde ss Thanks in advance.

reading
Please help me

Social Studies
Why did Japan need to rebuild its economy following World War 2

math
I just want to check to make sure I am correct -- my equation is y = -x^2 + 90x - 800 If x = 100, -x^2 would be 10,000, not -10,000? Because -100 x -100 is 10,000, not -10,000 --- my calculator keeps giving me a negative number. So my overall number is 18,200

Social Studies
Yeah, you are right, you probably dont trust me, but I promise I am telling the truth. Just try it and you'll see.

Math
True

English
Really? I dont.can I get a link that shows how to format it?

English
Yes. We are allowed to write a narrative story

English
I'm supposed to be doing it on the short story pauls case. But it's supposed to be a personal response so I wanted to write a short story

English
What do these texts suggest to you about ways in which individuals pursue or compromise their happiness? Can I please get a thesis? Like a general one without including the texts. I'm having trouble figuring it out.

social studies
So it is A?

algebra
a bathtub in your home has a drain that leaks. When you fill you bathtub with 30 gallons of water you notice that after every 5 minutes you only have 20 gallons remaining, so the drain is leaking 2 gallons every minute which represents slope. what is the linear equation of the...

social studies
Whats the answer?

chemistry
Most top-loading balances used in this experiment measure a mass only to the nearest mg(+_0.001g).? This significantly affects the calculation of R in this experiment. Explain why this is so. How might the procedure be modified to compensate for this systematic error?

chemistry
What would be the effect on the calculated value of R of each of the following experimental errors? Explain each answer. a. the liquid level in the eudiometer tube is lower than that in the beaker, but this is not taken into consideration in the calculations. b. the balance ...

Trigonometry
And if I choose 4 as the radi. Then would it be: sin (315°)= y/4 4 sin (315°)= -2.8284 So that is the y value. Cos (315°) = x/4 4 cos (315°) = 2.8284 So that is the x value ?

Trigonometry
I'm having trouble doing trigonometry. Determine the possible coordinates of a terminal point for each angle in standard position. A) 315° I have no clue how to do this. Please explain and show me the work so I can do the rest of the questions myself

Algebra
What happens to the mean of a set of data if you add a constant value to each data piece?

Chemistry
So my answer is right?

Chemistry
Determine the molar concentration of sodium oxide if 3.91g of solid was added to 525mL of solution. I am not typing my entire work in but I calculated these values: V=525 ml= 0.525L N= 0.0603084866 Would it be 0.120 mol/L

Science disscussion
Really? I have been waiting all this time for this?

Science disscussion
What form of pollution, if any, does each energy source cause How does the economy influence energy source choices How does location influence energy source choices

Math
An archer shoots an row into the air such that it's height at any time, t, is given by the function h (t)= -16t^2+kt+3. If the maximum height of the arrow occurs at time t=4, what is the value of k? A) 128 B) 64 C) 8 D)4 What I did: H (t)= -16t^2+kt+3 4= -16 (4)^2+ k(4)+3 ...

literature
what method does jerry use to lie underwater on the sea floor? a. he wears swimming goggles b.he dives holding on to a big rock c.he dives past the older boys d.he counts to 115 Is it b? PLEASE HELPPP QUICK

Chemistry
Would it be SO4 2-

Chemistry
you are given two unlabelled colorless solutions: AgNO3(aq) and Ca(NO3)2. A)Which ion when added to each unlabelled solution would produce a precipitate with the calcium and silver ions? No clue what this question is asking. Can I get help?

Math
A ball is thrown from a cliff. This is modeled by the eqn h=-5t^2 +5t+210 How long does it take the ball to reach a height of 60m? I don't understand how to find this, please help.

Math
Describe the following transformations on y=x^2: y=-4(2x+10)^2 -7

Math
The population of a town is modelled by P=-0.1x^2+1.2x+4.4 where x is the number of years since the year 2000, and y is the population in thousands. a) In the year 2005, what is the population? I used the equation, put x=5 and I got 7900 as the population. b) In the year ...

Functions
Describe the following transformations on y=x^2: y=-4(2x+10)^2-7 I really don’t understand transformations, please help

Math
Round 6784 to the nearest thousand, hundred and ten

Math
A basketball is tossed from the top of a 3m wall. The path of the basketball is defined by the relation y=-x^2+2x+3 where x represent the horizontal distance travelled, in metres, and y represents the height, in metres, above the ground. A) How far has the basketball travelled...

Math
Two factory plants are making TV panels. Yesterday, Plant A produced 9000 panels. Ten percent of the panels from Plant A and 3% of the panels from Plant B were defective. How many panels did Plant B produce, if the overall percentage of defective panels from the two plants was...

GEOMETRY
What are the steps for using a compass and straightedge to construct a square?

Computer Science
You want to buy a new car, and you are thinking about two alternatives, car A and car B. You like both cars, and you are considering keeping whichever one you buy for many years to come. As a result, you want to evaluate the total cost of ownership of both cars over many years...

Computer Science
You want to buy a new car, and you are thinking about two alternatives, car A and car B. You like both cars, and you are considering keeping whichever one you buy for many years to come. As a result, you want to evaluate the total cost of ownership of both cars over many years...

Chemistry
For potential and kinetic energy when it comes to phase change, do the temperatures remain constant in one of them? I forgot which one it was. Can you help?

GEOMTRY
I REALLY NEED HELP IN THIS 2 COLUMN PROOF Complete the two-column proof. Given: is complementary to . bisects . Prove: is complementary to .

Physics
if a machine is capable of accelerating at a constant speed of +20.0m/s^2 calculate the time required for it to go from -5.00m/s to +55m/s

Chemistry
Oh okay. We didn't learn that as of now. But I'll include that into my answer.

Chemistry
Oh okay. We didn't learn that as of now. But I'll include that into my answer.

Chemistry
Is cl2 or F2 less volatile? Cl2 is less volatile because it has more intermolecular forces and therefore has a higher boiling point. Is this right?

English
Okay thank you for the help

English
What ideas does the director develop regarding the conflict between pursuing a specific desire and choosing to conform? Rewrite as a How/Why question in your own words. In my own words: What ideas does the director say about being in an internal conflict with yourself, of ...

math
Oh okay. Because what I found: The current temperature in Smalltown is 20 °F. This is 6 degrees less than twice the temperature that it was six hours ago. What was the temperature in Smalltown six hours ago? One reading at an Arctic research station showed that the ...

math
What was the temperature? Reread what you wrote because I think some information is missing or it autocorrected.

Pre-calculus
How do I factor this: 6m^2 + 7mn + n^2 I really don't understand this one

Pre-calculus
I have a really basic question. Say I have a rational expression and my numerator is 4xy. Am I allowed to factor out just the x or just the y? For example y(4x)?

Pre-calculus
Thank you! That helped me a lot and I understand it now.

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