# Posts by Anna

Total # Posts: 2,766

**Physics**

Thank you

**Physics**

A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...

**Chemistry**

@DrBob222 Thanks! It really did help me understand it better

**Chemistry**

HW Help!!!! An object at 4500 K emits the blackbody spectrum shown here. This object emits the most light in the __?__ part of the visible spectrum.

**Chemistry**

The color of light emitted by a hot solid object depends on?

**Chemistry**

Given that many laboratory gases are sold in steel cylinders with a volume of 43.8 L, What mass (in grams) of argon is inside a cylinder whose pressure is 17810kPa at 24∘C? I've attempted this problem but I'm not getting the correct answer. Please explain if you ...

**Chemistry**

P= [14.5g*(0.0821L*atm/mol*K)*305K]/0.13L P=2792.98 P=2792.98*760mmHg = 2122664.8 g/mol*mmHg

**Chemistry**

If 14.5g of CO2 gas has a volume of 0.13L at 305K , what is its pressure in millimeters of mercury? I've plugged these values into the equation P=nRT/V but I am having troubles with canceling labels and getting the correct answer. Please explain as much as possible to me!

**Spanish**

Thank you so much! I hope you have a wonderful holiday.

**Spanish**

Thank you Sra. I tried these three again. You were correct they are too complicated. I sometimes feel I need to add more information than necessary. 14. ¿Qué Hizo el jefe de correos al leer la carta? Al leer la carta el jefe de correos recogido dinero para Lecho...

**Spanish**

Hola Sra. This one is a bit long. I hope they are correct. Part I Los pronombres relativos. Complete las oraciones siguientes en una manera lógica. Juan es el hombre a quien… Juan es el hombre a quien necesito dar el dinero. 1. Es un problema que… Es un ...

**MATH!!**

Joe and Susan invested $1500 at Bank of America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their investment added $500 and invested in at Bank Bravo, at 5% compounded quarterly. a) What is the value of this ...

**MATH!**

Thank you very much!

**MATH!**

Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effective rate of this investment?

**Social Studies**

Which of the following is the largest ethnic group in china A.Han B.tibetan C. Uighurs D. Hui Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat Crops grow well on the north China plain because the Huang river ___ A. Forms...

**Chemistry**

Use bond energy values to estimate delta H fro the following reaction in the gas phase: C2H4 + Br2 -> CH2BrCH2Br I am in dire need of help! Thank you

**Spanish**

Hola Sra. Are these correct? La tercera persona plural de pretérito. Cambie las formas entre comillas al pretérito según el ejemplo. Ejemplo: No “han podido” sacar dinero de la máquina. No pudieron sacar dinero de la máquina. Esos ...

**Math**

The ratio of guys to girls in the classroom is 8:1. There are 45 people in the classroom. How many of them are guys?

**Physics**

K=.693/ (10000 years -> seconds) starting amount * K= atoms decayed

**history**

what proposal sought to unite the American colonies against the french

**Math Elementary Linear Algebra**

determine whether or not the given set forms a basis for the indicated subspace: #1 {1,1,0), (1,1,1)} for the subspace of R^3 of all (x,y,z) such that y= x+z #2 {[1,2,-1,3), (0,0,0,0)} for the subspace of R^4 of all vectors of the form (a,b, a-b,a+b) and #3 {(2,0,2), (1,1,1)} ...

**math**

when a traffic light turns green, a car accelerates at a constant rate, the decelerates in the same manner to stop at the next traffic light. The speed of the car, s, is given by the equation, s=-10 /t-8/ + 80 where t is time. Find the time , t, it takes for the car to reach ...

**Math**

show that the set of all m-vectors whose first components is 0 (of R^m)

**Chemistry**

What is the molarity of a solution prepared by dissolving 820. g of sodium phosphate, Na3PO4, in water and diluting to 2.89 liters? (atomic masses: Na = 22.99, P = 30.97, O = 16.00)

**Spanish**

Sra. do these look correct? ¿Cuánto tiempo hace que…? Conteste las preguntas utilizando frases completas en español. 1) ¿Cuánto tiempo hace que has escrito una carta a mano? ¿A quién la escribiste y por qué? Hace ...

**geomerty**

how to find the distance between each pair of points (0,3)and (3,-5)

**Biology*STUCK***

1.b 2.c 3.c

**Chemistry**

Consider the evaporation of water at 298 K and 1 atm pressure: H20 (l) <---> H20 (g) Given that ΔGOrxn= 8.6kJ/mol, what is the equillibrium vapor pressure of water at 298 K?

**Chemistry**

Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?

**Chemistry**

Please disregard this question. It's been answered: BaCl2 + Na2S \-> BaS + 2 NaCl

**Chemistry**

A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...

**Chemistry**

Thank you Dr. Bob, I appreciate your help. I will look at the link. :D

**Chemistry**

A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...

**Chemistry**

A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \(->NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \->Cu(NO3)2 + 2 NH4Cl Sr(NO3)2 + ...

**Spanish**

Sra. do my answers look correct? Querida Abby… Complete el párrafo abajo por escoger una palabra lógica de la lista siguiente para llenar los espacios en blanco. Querida Abby, Tengo un problema. No sé qué debo ___(1)____. Recientemente, mi ...

**math**

Thanks Reiny. I didn't understand that. Whoever made this question, hope you got it correct.

**chemistry**

Rank the following elements by electron affinity, from most positive to most negative EA value: tellurium, bismuth, neon, sodium, iodine i tried Te, Bi, Na, I, Ne and it was incorrect.

**Science**

882.9

**chemistry**

K(s)+NH3(g)→ ?

**Math**

No, because I took the quiz and it said the answer was C after I took it and I thought it was D, too but it wasn't

**Math**

Answers D A B A C 100% Guaranteed on your connexus quickcheck :) :) :)

**Math**

I'll report back to you guys when I have the answers to help :)

**Math**

2/7

**trigo**

a bicycle has a front wheel with a diameter of 24cm and a back wheel with a diameter of 60cm. through what angle does the front wheel turn if the back wheel turns through 12 radians

**Social Studies**

Shawn Mendes is life <3 thank you for the answers too btw really helped me too !!

**chemistry**

Cloves contain two principal essential oils, caryophyllene and eugenol. A student carrying out a steam distillation using cloves obtained a mixture of these two oils in the distillate. Explain how the student could separate and isolate the two essential oils using liquid-...

**chemistry**

Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...

**chemistry**

Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g of aniline. What is the minimum volume of water required to isolate 10 g of aniline in a steam distillation at 760 mmHg?

**Chemistry**

A meteorological balloon contains 237. L of helium at 33. °C and 0.832 atm. If the volume of the balloon can vary according to external conditions, what volume would it occupy at an altitude at which the temperature is -57. °C and the pressure is 0.094 atm? (2 ...

**Chemistry**

Suppose 55.3 L of a gas is at a temperature of -73. °C. If its temperature is increased to 411. °C, what will its volume be then?

**Spanish**

Thank you so much Sra. My assignments aren't due until the following week. Never feel like you have to answer right away.

**Spanish**

Hola Sra ¡Feliz Halloween! Do my answers look right? Part I ¿Ingestión o intoxicación? Traduzca la conversación siguiente al español utilizando los tiempos compuestos como apropriado. Es importante usar el tono formal (Ud.) ya que una ...

**math**

barmodel

**Spanish**

Sra. are these three correct? I have a short assignment this week. Thank you! Conteste las preguntas utilizando el pluscuamperfecto de indicativo según el modelo. Use el mismo verbo que se usa en la pregunta. Modelo: ¿Por qué no nos ha dicho la verdad ella...

**L/A**

Hi we're doing the same assessment if you ever got the answers could you give them to me?

**Chemistry**

How would you prepare 165 mL of a 0.976 M NaOH solution, starting with a 6.36 M stock solution? Volume of solution needed? Volume of water needed?

**Algebra**

I don't understand how to find the equation to solve this. A family drove two cars to a reunion. The first car traveled at 50 mph. The second car left 1 hour later and traveled at 65 mph. How long will it take for the second car to catch up to the first car?

**algebra**

has inherited $15,000 that she wants to invest in two separate accounts, one paying 4% and one paying 3% annual interest. If the total interest earned for a year is $550, how much should she invest at each rate?

**science**

what force is applied by Andre if he does 250 J of work as he pushes a box 19 M along the ground ?

**Spanish**

I'm so sorry. I did type #9 wrong. It is... Xavier, “quiero que le preguntes” al dependiente si hay un restaurante cerca. Xavier, __________ al dependiente si hay un restaurante cerca. My answer is: pregúntale Thank you so much for your help! It seems with...

**Spanish**

Sra. this week I had a review. Do my answers look correct? Part I Indique si las palabras en pares son sinónimos, antónimos, o no son relacionadas. 1. A ancho y apretado - antónimos B corto y flojo - no son relacionadas C vestirse y quitarse - antó...

**Algebra**

I still don't get it, where do I simplify at? Fractions aren't my strong point.

**Algebra**

Solve for x in each of the following: A: 2/3 = x/18 B: 3/x = 3x/x^2 I think I have the first one. I am clueless on the second one! HELP!

**Chemistry**

A compound containing boron and hydrogen has been synthesized. You perform two experiments to determine the molecular formula of the compound. A 0.492 g sample of the compound is burned in pure oxygen to produce B2O3 and 0.540 g of water. In the second experiment, when a 63.1 ...

**Math**

4.355

**physics**

A man threw a ball horizontally out of an elevator that was traveling upward at a rate of 5.50m/s. If the ball was thrown at a velocity of 10.5m/s when the elevator was 15.3m above the floor of the atrium. How far from the base of the elevator did it land?

**math**

Determine whether the fractions in each of the following pairs are equal: a: a^2/b and a^2b/b^2 b: 377/400 and 378/401 c: 0/10 and 0/-10 d: a/b and a+1/b+1, where "a" is not equal to "b" or a =/= b

**Spanish**

Sra. do these look correct? Part I Entonces, complete el diálogo telefónico en una manera lógica utilizando oraciones completas en español. 1. Dígame. Hola. ¿Puedo hablar con el señor Costa? 2. ¿De parte de quién? ...

**B sometime**

B sometime

**Math**

64/8 64 divided by 8 = 8 8x8=64 Tip: With ratios always divide by the denominater by the numerator to get your answer

**math**

6 12÷2=6 6×2=12

**Engineering**

what heading must a pilot fly to compensate for a 125km/h west wind to have a ground track that is due south? The airecraft cruise speed is 600 km/h. What is the actual ground speed?

**Algebra**

does not help at all give me the answer now

**chemistry**

How many moles of molecules are in 198 g of hydrogen nitrate (HNO3)? Answer in units of mol

**Pre-Calc**

1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False 2.) If w varies directly as z and w = 9 when z = -6, find w when z = 3. 3.) If y varies directly as x and y = 2 when x = 4, find x when y = 4.

**Spanish**

Thank you for your corrections Sra. I am not sure why I was so confused about the second part. I thought I was using indicative imperfect but I was so wrong. At least the subject half was ok. As for gustar I should have known better. I always get tricked with that verb. Thank ...

**Spanish**

Sra. are my answers correct? Thank you so much for your time. Part I El condicional. Llene el espacio con la forma condicional del infinitivo dado. ¡Cuidado! Los acentos son importantes. 1. Mi esposo y yo _______ contigo, pero no nos sentimos bien. (IR) iríamos 2...

**Math**

if jerry bought 6 shoes for 85 dollars, how much would fred have to pay for 17 pairs at the same rate?

**math/ unit rates**

5/32

**physics**

A geosynchronous satellite is one that appears to be fixed in the sky, a condition useful for telecommunications. If such a satellite orbits the earth at an altitude of 33000 km above the earth's surface, what is its centripetal acceleration? The radius of the Earth is ...

**physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?

**Spanish**

Sra. would you look over my answers please? Part I. El subjuntivo con expresiones hipotéticas: Complete las frases siguientes utilizando EL SUBJUNTIVO. Ejemplo: No completaré la tarea hasta que... estudie los verbos. My answers are after the ... on each 1. Ser&...

**History on Middle Ages(PLEASE HELP NOW)**

Guilds did not vote on religious issues that affect trade.

**math**

Becky a saleswoman,is offered two salary plans. Plan 1 is $450 per week salary plus a 3% commission of sales. Plan 2 in a $300 per week salary plus a 16% commission of sales.How much would Becky need to make in sales for the salary to be the same from both plans?

**math**

where do you get 547 and 92 from?

**math**

A telephone long-distance carrier charges customers $0.99 for the first 20 minutes and then $0.06 for each minute(or any part thereof) beyond 20 minutes. If Mary uses this carrier,how long can she talk for $4.00? I started off with 0.99x+20+0.06x=4.00. PLEASE help, I don't...

**math**

when you divide the numerator of a fraction by the denominator you always get either a decimal that terminates or a decimal that repeats a digit or block of digits again and again

**math**

any number that can be expressed as the ratio of 2 integers a/b, where b does not equal 0, is a rational number

**Spanish**

Thank you so much Sra. Your explanation on making it sound the same is perfect! Much easier than breaking them down into syllables and working back one. Especially since I broke estudia into 4 syllables when it should be 3. As for the subjective I think I need more practice. I...

**Spanish**

Would it be possible to have Sra double check my answers? She was such a huge help last semester. Part I ¿Subjuntivo o indicativo? Completa cada oración con la forma correcta del verbo indicado. ¡OJO! No todas requieren el subjuntivo. 1. Esperamos que el ...

**physics first year**

The corners of a square lie on a circle of diameter 0.4 m. Each side of the square has length L. Find L.

**chemistry**

I donot know the answer

**chemistry**

Nickel is about 2 millimeter thick or 2/1000 of a meter.how many nanometer is this?

**PLEASE HELP! Math**

I really need help with this one question on my math pretests and I have no idea what to do! The question is: Mandy begins bicycling west at 30 miles per hour at 11:00 am. If Liz leaves from the same point 20 minutes later bicycling west at 36 miles per hour, when will she ...

**8th grade homework**

I could really use some help with this problem because I'm pretty confused on what to do. The formula for the volume of a cone is V=1/3(pi)r^2h where v represents volume, r represents the radius of the base, and h represents the height. What is the height of a cone with a ...

**Geometry**

I could really use some help with this problem because I'm pretty confused on what to do. The formula for the volume of a cone is V=1/3(pi)r^2h where v represents volume, r represents the radius of the base, and h represents the height. What is the height of a cone with a ...

**8th grade homework**

Please help me I beg of you! My math teacher is awful and I have no idea how to do my pretest and she's picky about showing my work so it would be helpful if you could explain :) 1.six is subtracted from a number. The result is devided by four. This result is added to 10 ...

**business**

reliability

**physics**

11.7 g