Posts by Lauren

Total # Posts: 1,847

Chemistry
a diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 degrees celcius. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 degrees celcius

physics lab
For an unknown sample of the experiment, students measure 1602 counts when they first receive their sample and 1317 counts 3.5 minutes later. Calculate the half-life t12 of their sample.

physics
a,c,d,e,f

Calc II
Can anyone just give me an idea on how to go about solving this problem

Calc II
Use the comparison or limit comparison test to decide if the following series converge. Series from n=1 to infinity of (4-sin n) / ((n^2)+1) and the series from n=1 to infinity of (4-sin n) / ((2^n) +1). For each series which converges, give an approximation of its sum, ...

physics
A charge of +Q and a charge of +2Q are separated by a distance r. The electric force of +2Q on +Q has a magnitude of F and is directed to the right. Which one of the following statements is correct regarding the electric force of +Q on +2Q?

physics
A beam of microwaves with wavelength= 1 mm is incident upon a 9 cm slit. At a distance of 2 m from the slit, what is the approximate width of the slit's image?

Chemistry
Aspirin is prepared by heating salicylic acid, C7H6O3, with acetic anhydride, C4H603. The other product produced is acetic acid, C2H402. C7H6O3+C4H6)3->C9H8O4+C2H4O2 What is the theoretical yield in grams of aspirin, C9H8O4, when 2.00 grams of salicylic acid is heated with ...

Trigonometry
Alrighty I have to find two real world sinusoidal functions. I found: 1. A piston in an engine moves up and down in a cylinder. The height, h centimeters, of the piston a t seconds is given by the function: h= 120 sin(πt) + 200. 2. You can find the amplitude of a wave ...

math
The two equivalent fractions of 8 over 36 are: 4/18 and 2/9

Chemistry
A 100g sample of ice at 0ºC is added to 150.0 mL of liquid water at 80ºC in a styrofoam cup calorimeter. (The specific heat capacity of water is 1.184 J/g•ºC, the density of water is 1.00 g/mL, and ∆Hºfus = 6.01 kJ/mol) a) Does all of the ice ...

Math
I think it's 11,211.

Trigonometry
4. Write the equation of the cosine function with an amplitude of 1/3, a period of 2pi, and a phase shift of 3pi/2. I got 1/3COS(1/2x-3pi), but I really do not think that is correct D: any tips or advice?

Physics
The path of a light ray that crosses the boundary between two diff. media is irreversible

math
(-x-3)+(4x-7) =(+4x-x)+(-7-3) =3x-10

science
what is the density if the mass is 17g and the volume is 34cm3 ?

physics
A certain 0.92 kg object will reach terminal velocity after 0.75 seconds. What is the speed of its terminal velocity and what is the force from air resistance at this speed? (Assume it would would accelerate at 9.81 m/s^2 until it reaches terminal velocity.)

English
well, if you will notice I gave the question and then my response.

English
Did I do these correctly? (This homework question was removed due to a copyright claim submitted by K12 Inc.)

narbonne high
46.65

Calculus II
i don't understand why you raised the 3 and 5 to 1/2

Calculus II
please someone help this is due tomorrow and i don't know where to start with solving this!

Calculus II
Fed loves polynomials with rational coefficients and only such polynomials.Suppose f(x)=square root of x. Find a polynomial P(x) that Fred will adore so that, for any x in the interval [3,5], the difference between P(x) and f(x) is less than .01 Hint: The interval is [3,5]. ...

Early Child Care
the answer is b: the brain runs better when food intake is irregular.

Oh i see, thank you for the link, that helps a lot.

this is how I solve, seems totally wrong. (17.5*7)/10 = x 122.5/10 = x 12.25 = x x = 12.25

A proportion is shown below. 7/10 = 17.5/x What is the value of x?

Math (kindergarten)
10+8+20+1= 39

History
how did the indians feel about being colonised by the brittish? and what was the relationship between the brittish and the indians?

history
i really need help on this short answer question. Compare and Contrast the significance of the various reform movements in Europe AND Asia during the Early Modern Era. thank you!!

Math kindergarten
I counter could either be a circle or square.

Assume that height is a function of age and that H=f(a) is the average height (in inches) for females in the US at age (a) years. What is the practical interpretation of f(z)+20? a. 20 years older than the average US female who is z inches tall b. 20 inches taller than the ...

maths
if the size of each exterior angle of a regular polygon is 90 degrees how many sides does it have?

statistics
According to the book Are you Normal?,40% of all US adults try to pad their auto insurance claims to cover their deductible. Your office has just received 128 in insurance claims to be processed in the next few days, what is the probability that fewer than 45 of the claims ...

physics
Matt runs away from Ashley. Matt runs 40 m north and 30 m west. What is the minimum distance Ashley must run to catch Matt? Draw the image and label the vectors and scalars.

Statistics
In a recent study a SRS of 525 employed Americans, 53 individuals indicated that they would fire their boss if they could. Calculate a 90% confidence interval for the population proportion who would fire their boss if they could.

Physics
if pressure inside a cylinder with a circular hatch is 2 atm and the radius of the entrance hatch is 12 inches, what force does the air exert on the hatch? i cannot figure out if it would be 13,300.6 lb 24 lb 288 lb 1,300.6 lb or 904.8 lb

Calculus II
Calculate the area inside both of the ellipses (x^2)/3 + y^2 =1 and x^2 + (y^2)/3 = 1.

human services
identify three barriers to services,planning,funding,or empowerment in a selected aspect of human services.How does community development help address these barriers? How applications could be utilized as a means to overcome each of these barriers?

physics
The initial velocity of a 2.36 kg block sliding down a frictionless inclined plane is found to be 1.46 m/s. Then 1.07 s later, it has a velocity of 4.46 m/s. What is the angle of the plane with respect to the horizontal? I did this: a=(4.46-1.46)/1.07=2.80 m/s^2 force along a ...

Physics
An elevator (cabin mass 600 kg) is designed for a maximum load of 2100 kg, and to reach a velocity of 3.1 m/s in 3 s. For this scenario, what is the tension the elevator rope has to withstand? This is what I've tried and is incorrect. 2100kg + 600 kg= 2700kg (m) (3.1/3)= 1...

physics
If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what distance d_b would the bird cover?

physics
A student bikes to school by traveling first d_N = 0.900\rm {miles} north, then d_W = 0.600\rm {miles} west, and finally d_S = 0.100\rm {miles} south.

Social Studies 8R - Help!!!!!
Thank You!!!!! :)

Social Studies 8R - Help!!!!!
What role did the freedmen play in Reconstruction governments? Answer - Before the war, African Americans had no voice in southern government. During Recontruction, they not only voted in large numbers, but they also ran for and were elected to public office in the South. am i...

math test
In geometry, two lines or planes (or a line and a plane) are considered perpendicular

English 8R - HELP! (FAST!)
English 8R HW - literacy elements + literacy devices, look it up and take notes Please help!!!!! ps -- what is literacy devices????????/

Science 8R - HW Help!
I know the Scientific method it's just that I can't think of a problem I can solve How to get my homework done before 8pm? is that good????

Science 8R - HW Help!
Science 8R HW - Using the steps of the Scientific Method solve a problem that you may have (for example, 1. How can I get my little brother to stop eating my homework) I can't think of one.... please help! any ideas or suggestions???

Social Studies 8R - HW Qs. Help! (FAST!)
Heres my answer: However, except for a few battles such as Gettysburg and Antietam, no fighting had taken place on northern soil. am i correct??????? please be honest

Social Studies 8R - HW Qs. Help! (FAST!)
no .... i don't think so in my textbook is said: The North lost more soldiers in the war than the south did.

Social Studies 8R - HW Qs. Help! (FAST!)
The north lost more soldiers in the Civil War than the South did. Why was it easier for the north to recover from the war?

Organic Chemistry
cyclohexane=1.4264 toluene=1.4967 at 20˚C Mixture=1.4563 at 20˚C Assuming that the relationship between refractive index and concentration is linear, calculate the composition of the mixture. What do I do? Formula?

chemistry
Do impurities raise or lower the refractive index of a liquid? Please explain, I can't find it anywhere.

SS8R: The National Convention The Female Voice
Thank You! :) I'm going to go over my essay AGAIN and revise and edit it. Thank You again for reading and checking my essay Ms. Sue! :) I hope I get a good grade in this assignment. PS --- What's wrong with the sentence? There's not much multi-cultural in the ...

What is the difference? |-9| - |13| =? A)-22 B)-4 C)4 D)22

I am going to practice more from the link, thank you Ms.Sue :)

Thanks but I still don't understand...what if when add two negative, nonzero integers? still "maybe be positive or negative"?

Which of these statements is true when you add a positive, nonzero integer and a negative, nonzero integer? A)The answer may be positive or negative. B)The answer is always negative. C)The answer is always zero. D)The answer is always positive.

physics
wrong

(-13) + (-1)

world history
Compare and Contrast the various models of trading post empires that were created by the Europeans during the Early Modern Era. please help! thank you:)

social studies
C. Cuba

us history/ english
Can anybody help me understand the first three chapters of Lies My Teacher Told Me? Maybe possibly give some summaries or themes

then c.-26...thanks :)

Each of the first 4 pit stops a racecar driver makes loses ten seconds off the leader. The pit crew makes adjustments, and at each of the next two pit stops he gains 7 seconds on the leader. How much time is the driver off the leader? a. 40 seconds b. 14 seconds c. -26 seconds...

Calculus
i don't get 5/48 when i plug in root 3/2

Calculus
i don't understand how to integrate x(1-x^2)^.5

Calculus
find the area between the two curves y=1/2x and y=x square root of 1-x^2

Which expression has the same value as −|−3|⋅|5|? a. −3⋅(−5) b. 3⋅5 c. −3⋅5 d. −(−3⋅5)

Math
100 ft

Physics
A pitcher throws a 0.5kg ball of clay at a 6kg block of wood. The clay sticks to the wood on impact, and their joint velocity afterward is 3m/s. What is the original speed of the clay?

Law
Okay thanks

chemistry
The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combustion. The energy released during combustion caused a 14.2 degree Celsius increase in the temperature of 200.0 mL water in the calorimeter. Calculate the mass of peanut burned.

chemistry
awesome thank you!

chemistry
could the products ever become the reactants in chemical reaction? explain. thanks!

math
The school auditorium has 8 rows of seats, divided into 3 setions. Each section has 15 seats. Which of the following is the correct way to figure out the total number of seats? a. 8 x 15 b. 8 x 3 x 15 c. 3 x 3 x 8 d. 8 x 3 I thought it should be 15 x 3

english
what is a manifesto?

HEALTH
Haha Aya was from 2012 im on ashworth in 2015 using it Wow

statistics
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper has mean 320 inches and standard deviation 30 inches. Suppose that the results for 100 consecutive Mondays can be regarded as a random sample and let J denote the mean ...

physics
Standing waves on a string are generated by oscillations having amplitude 0.005 m, angular frequency 942 rad/s, and wave number 0.750p rad/m. a.) What is the equation of the standing wave? b.) At what distances from x=0 are the nodes and antinodes? c.) What is the frequency of...

health
C Peer pressure to look a certain way

Physics
A series RCL circuit has a resonant frequency of 1500 Hz. When operating at a frequency other than 1500 Hz, the circuit has a capacitive reactance of 5.0 Ù and an inductive reactance of 30.0 Ù. What are the values of (a) L and (b) C? I know I should be using ...

physics
A 1.20 kg mass on a horizontal spring oscillates on a frictionless surface with a displacement as a function of time given by x(t) = 0.075cos(4.16t – 2.45). (Units are standard units.) a.) Find the time for one complete vibration. b.) Find the force constant of the ...

Physics
A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...

physics
A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...

Physics
If a wire of resistance R, resistivity ñ "roe", length L, and cross sectional area A, had its length doubled and radius halved, what would be the ratio of R'/R. Where R' is the new resistance of the wire. I thought it would be 4 times R, giving the ...

physics
A wire has a resistance of 27.2 ohms. It is melted down, and from the same volume of metal a new wire is made that is 3 times longer than the original wire. What is the resistance of the new wire? Resistance and length of wire are proportional, but what I am unsure of is if ...

Physics
A 1.20kg ball is rolled down a frictionless ramp whose top is 0.80m above a horizontal spring with ks = 800N/m. The ball reaches the horizontal just in front of the spring. a.) What is the kinetic energy of the ball just before it contacts the spring? b.) What is the velocity ...

Math
A tree one hundred cubits high is distant from a well two hundred cubits; from this tree one monkey climbs dow the tree and goes to the well, but the other leaps in the air and descends by the hypotenuse from the high point of the leap, and both pass over an equal space. Find ...

Physics
A revolving door consists of four rectangular glass slabs,with the long end of each attached to a pole that acts as the rotation axis. Each slab is 2.60m tall by 1.50m wide and has mass 39.5 . Find the rotational inertia of the entire door. If it's rotating at one ...

Physics
A skier starts from rest at the top of a hill that is inclined at 9.8° with the horizontal. The hillside is 170 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of friction is ...

algebra
Simplifying 2log(x + 1) + -2log(x + -1) + -1log(x + -1) Reorder the terms: 2glo(1 + x) + -2log(x + -1) + -1log(x + -1) (1 * 2glo + x * 2glo) + -2log(x + -1) + -1log(x + -1) (2glo + 2glox) + -2log(x + -1) + -1log(x + -1) Reorder the terms: 2glo + 2glox + -2glo(-1 + x) + -1log(x...

ALGEBRA
E=L X R 460 = L X 92 L= 460/92 = 5 amps

Algebra & Trig
Was there a picture given? I don't know if I can answer the question without a picture.

Physics
An object slides down a frictionless 33 degree incline whose vertical height is 54.0 cm. How fast is it going in meters/second when it reaches the bottom?

Physics
A spring whose spring constant is 650 N/m is compressed 0.600 m. What speed (in meters/second) can it give to a 0.100 kg ball when released

Physics
What is the minimum work in joules needed to push a 1460 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)

physics
A 1370 kg car rolling on a horizontal surface has a speed of 20 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 5.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.)

physics
Why do the magnetic poles of cans reverse when turned upside down?