Posts by lydia

Total # Posts: 224

physics
so i found a formula: m1v1ix +m2v2ix = m1v1fx + m2v2fx which i rearranged to find v1fx and eliminated m2v2ix because m2v2ix = 0 so the eqn looked like: v1fx = (m1v1ix - m2v2fx)/m1 subbing in i got: [(0.029)(200) - (1.1)(6.25)]/(0.029) which gave the answer -59.8276. is this ...

physics
i'm just unsure of what formula i should apply!

physics
A 29 g rubber bullet is travelling to the right at 200 m/s, when it hits a 1.1 kg block of wood sitting on a horizontal frictionless surface. If this collision is inelastic (though not perfectly inelastic), and the velocity of the block of wood after the collision is 6.85 m/s ...

physics
Assume you are given two objects whose centre of mass is located exactly at the origin. The first object has a mass of 33 kg and is located at position +30 m with respect to the origin. If the mass of the second object is 7.0 kg, what is its position (in m) with respect to the...

physics
Ian is firmly attached to a snowboard which is on a flat surface of ice, which you can assume to be frictionless. He and the snowboard are initially at rest. He then throws a 138 g ball which travels at a speed of 19.2 m/s, and finds himself moving backwards at a speed of 0.05...

physics
Is the answer 3645.77? Thanks for your help, btw :)

physics
What is the magnitude of the momentum of a car weighing 1,555 N when it is moving at a speed of 23 m/s? Express your answer in kg m/s.

physics
Assuming maximal power output, how long, in seconds, would it take a 1,535 kg car with a 128 hp engine to accelerate from 50 km/h to 102 km/h? (1 hp = 746 W)

social studies
between 1400000 and 500000 years ago early hominids learned how to?

Ecology
Signs of fish stress include A. increased respiration B. faster scale growth C. reduced feeding rates D. both A and C Thanks for the help!

Math
Lee Holmes deposited $16,600 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional $41,600 at 9% interest compounded semiannually. At the end of year 6, what is the balance in Lee’s account? I have tried ...

Math
Thannk you both of you but both answers are incorrect. I can input the answer to see if it is right and both are wrong. We are all missing something. If anyone else wants to try please do!!!

Math
Lee Holmes deposited $16,600 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional $41,600 at 9% interest compounded semiannually. At the end of year 6, what is the balance in Lee’s account? I have tried ...

history
thanks so much!

history
I couldn't find it on any of those sites.

history
Hi I was wondering if someone could please help me with this question: What was the place of residence of the Ho-Chunk war chief Red Bird? I have searched many places and have had no luck finding the answer. Thanks much! =)

spanish
can someone tell me what this means please Esta campana muda en el campanario, esta mitad partida por la mitad, estos besos de Judas, este calvario, este look de presidiario, esta cura de humildad. Este cambio de acera de tus caderas, estas ganas de nada, menos de ti, este ...

physics
015 (part 1 of 2) 10.0 points A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 21 below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline ...

math
From the top of a lighthouse 75 feet high, the cosine of the angle of depression of a boat out at sea is 4. To the nearest foot, how far is the boat from the base of the lighthouse?

Geometry
I did, but I don't understand what he typed. Thanks

Geometry
Use the distance formula and the Pythagorean theorem to find the distance, to the neearest tenth, from R(6,-5) to U(-2,6)

geometry
write and equation on point sloop form for the perpendicular bisector of the segment with endpoints A(-3,-3) and B(5,6)

geometry
what does 'sqrt' stand for?

geometry
Use the distance formula and the Pythagorean theorem to find the distance, to the neearest tenth, from R(6,-5) to U(-2,6)

geometry
thanks!

geometry
Sorry, if 6, 10, and 12, and 9, 15 and x are the lengths of the coresponding sides of two similair triangles, what is the value of x?

geometry
if 6, 10, and 12, and 9, and x are the lengths of the coresponding sides of two similair triangles, what is the value of x?

geometry
you rock Reiny! And BTW..I call them vertices also...it was a typo. Thanks for your help!

geometry
this one is killing me for some reason: Find any of the values of k so that (-3, 4), (-8,5), and (-5, k) are the verticles of a right traingle.

Geometry
makes sence now. thanks so much!

Geometry
the lengths of 2 sides of a triangle are 2 inches and 10 inches. find the range of possible lengths for the third side, s.

Geometry
Life saver!! = )

Geometry
THe cosine law is confusing to me. This lesson gives no examples. The triangle is obtuse?

Geometry
Tell if the measures 9,11, and 7 can be side lengths of a triangle. if so, classify the triangle as acute, right, or obtuse?

Geometry
thanks so much!! You are too cool!

Geometry
so the answer is yes?

Geometry
no?

Geometry
Can a triangle have sides with lengths 7, 13, and 9?

Geometry
Thanks so much! I get it now

Geometry
Ok, I think I understand. so the coordinates of N are (4, -8)

Geometry
M is the midpoint of segment AN, A has coordinates (-6,2) and M has coordinates (-1, -3). What are the coordinates of N?

geometry
One equilateral triangle has sides 5 ft long. Another equilateral triangle has sides 7 ft long. Find the ratio of the areas of the triangles

geometry
Given that triangles KON and LOM are similar, find the scale factor

geometry
That is the question. I don't get it either.

geometry
Using the information about John, Jason, and Julie, can you uniquely determine how they stand with respect to each other? On what basis? Statement 1: John and Jason are standing 12 feet apart. Statement 2: Julie is standing 31º NW of Jason. Statement 3: John is standing ...

Geometry
find m_DCB, given angles A and F are congruent, angles B and E are congruent, and m_CDE=26

Geometry
Triangles ABF and EDG are congruent. Triangles ABF and GCF are equilateral. AG = 24 and CG = 1/5 AB. What is the total distance from A to B to C to D to E?? Please I don't understand this

St monica
Bill and Amy want to ride their bikes from their neighbourhood to school which is 14.4 kilmeters away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster (in meters/second) is Amy's average speed for the entire trip?

literature
novel phrase the domesticated generation fell from him ?

literature the novel
allegory of the call of the wild

math
What is the average area of a theme park? Thanks!

5th grd math- metric conversion
30m = 6000, i have converted to cm, in, and ft, no where close to getting 6000? help

physics
Our text does not even refer to multispectral.

physics
Multispectral refers to: A. UV, IR, and visible light B. the many colors in visible light C. UV, IR, and x-rays Thanks!

MATH
In an arithmetic sequence, the first term is 100 and the sixth term is 85. Find the common difference. Then, find the 50th term of the sequence. Do I use the formula an=a1+(n-1)d? If so, what would my "n" by in the equation?

social studies
Who is the richest person in Paraguay? Thanks!

Physics
The siren of a police car produces a sound of frequency 420Hz.A man sitting next to the road notices that the pitch of the sound changes as the car moves towards and then away from him.1- WRITE DOWN THE NAME OF THE PHENOMENON. 2-ASSUME THAT THE SPEED OF THE SOUND IN AIR IS ...

Physics
True or false the work done by a non-zero net force on an object, moving on a horizontal plane, is equal to the change in the potential energy of the object? and don't forget to give the correct explanation for my q.

Physics
True or false the work done by a non-zero net force on an object, moving on a horizontal plane, is equal to the change in the potential energy of the object? and don't forget to give the correct explanation for my q.

Physical science
What do you call the phenomenon that causes dispersion of white light when it passes through a triangular prism

Physical science
What do you call the phenomenon that causes dispersion of white light when it passes through a triangular prism

Physical science
What do you call the phenomenon that causes dispersion of white light when it passes through a triangular prism

pharmacy
importance of uniformity of weight test in pharmacy

biology
Can someone please help me with this question? Thanks! What organic molecules make up the structure that surrounds the DNA molecule?

math
Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.

math
Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.

Trignometry
An isosceles triangle has two sides of length w that make a 2á-degree angle. Write down two different formulas for the area of this triangle, in terms of w and á (Greek “alpha”). By equating the formulas, discover a relation involving sin 2á, sin...

4th grade
I guess it would be 7 feet on each side. THANKS JOE!!!!!!!!!!!:D

geography
Would Ireland be considered a developed country? How wealthy is it in comparison to other countries? Thanks!

history
Is it true that during the McCarthy era that if accused communists gave names of other communists then they would be let off the hook? Like, how did it work when McCarthy asked people for names? Thanks!!!

Physics
A string has a linear density of 6.7 x 10-3 kg/m and is under a tension of 210 N. The string is 1.6 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c) frequency of the traveling ...

Physics
The transverse standing wave on a string fixed at both ends is vibrating at its fundamental frequency of 250 Hz. What would be the fundamental frequency on a piece of the same string that is twice as long and has four times the tension? I know the equation f=v/2L. and that v=(...

math
A tie pin which sells for $200.00 has a markup rate of 30% on the selling price. Find the amount of the markup and the cost.

Mathematics
For the first 1 1/2 hours of a 91km journey the average speed was 30km/h.If the average speed for the reminder of the journey was 23km/h, calculate the average speed for the entire journey.

Chemistry
so is it 3 x 8.314 x (16°C + 273)K / (146.065 molecules / 6.02e23) = 2.970841253e25 ? is that right?

Chemistry
thanks

Chemistry
I have no clue as to how this problem should be solved... could i have some help please? Calculate the rms speed of SF6 molecules at 16°C

physics
At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at rest, slides without friction, and decends through a vertical height of 2.40 m, what is her speed at the bottom of the slide?

social studies
whats the difference between indentured and enslaved labor?

politics
What is the difference between nationalism and federalism? Thanks!

AED
The first 1980's school technology event and date .

english/science
Einstein was offered the presidency of Israel after Chaim Weizmann's death. He declined the position.

science
What exactly is a tax incentive?

science
Describe 2 ways government could promote the use of photovoltaic power systems for homeowners. Thanks!

5TH GRADE MATH NEED HELP ASAP
metric homework: 30m = 6000 i have converted to cm, in and feet, none get me to 6000 help

Literature (short story)
c c-

physics
At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg. What mass of ice ...

PHYSICS!!!HELP!!
I don't really get the last part...so that times 3600 = Joules gained to melt ice in one hour. Now kg melted = Joules gained/ heat of fusion in Joules/ kilogram Please explain.

PHYSICS!!!HELP!!
At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*1065 J/kg. What mass of ice ...

math
I don't understand how to write the formulas for unit analysis. I can do the problems, but the explanation of the formulas in my book doesn't make sense with the problems I am doing. For instance, this one: Find the unit rate: $2 for 5 cans of vegetables. I know it is...

government
oh, but can't you call communism government?

government
Hello there. I was wondering if someone could please tell me whether or not you could call a government totalitarian and communism? We're studying Sparta (from ancient Greece) and our teacher said it was totalitarian and later she said it was communist-like. Am I allowed ...

precalculus
State the domain and range of the function. y=the cubed root of (x-2) Thanks SO much!

psychology
Thank you so much!!!!!!

psychology
I know what the definitions are, but there is so much going on in the problem that I've gotten confused- dv- a person's frustration and aggression?, iv-socioeconomic status? experimental group- the two types of cars? no control group?

psychology
what would the dependent and independent variable and control and experimental group be in this problem: John is intrigued by the relationship between frustration and aggression. He proposes to study whether socioeconomic status is a factor in how drivers express their ...

english
Do you underline, put in italics, or quote article titles from magazines?

math
Please help. Name all values of x that are not in the domain of the given function. f(x)=x-10/(sqrt x^2-16)

pre-calculus
Can someone help me with this question please? A linear function may have zero, one, or infinitely many zeros. Illustarte all three of these situations. Thank you!

math
Please can someone help? 3/(x-7) + x^2+5x My answer is: x^3-2x^2-35x+3/(x-7) Is this right? I converted x^2+5x so that it had a common denominator of x-7 so I could add them.

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