# 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

**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.