Sunday

November 29, 2015
Total # Posts: 254

**Chemistry**

Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -251 B -403 C 213 D -511 My thoughts: [(2)(-511)+(213)(2)]-[(2)(-251)+(-403)]=309kJ (but apparently that is not the correct answer) What did I ...
*November 15, 2015*

**Trigonometry**

two pulleys of a car engine radius of 8 cm and 5 cm respectively are connected by a belt. The larger pulley rotates 80 times per minute. Find the angular velocity of each pulley in radians per minute.
*November 10, 2015*

**Chemistry**

Underground miners formerly used headlamps in which calcium carbide (CaC2) was reacted with water to form acetylene (C2H2) gas as shown in the following reaction: CaC2(s) + H2O (l) ---> C2H2 (g) +Ca(OH2)(s) The acetylene produced was then burned to produce a very bright ...
*May 3, 2015*

**geometry**

figure of kite top pointed left. Tail is point E. Segment from AB perpendicular to CD. Top side of kite is AC, bottom side is CB. I figured it ==== AC 9y-6 = 7y; I got 3 for y. So, C = 21; for (x) I got 5x+18=5x + 15 (x) = 3. So AD IS 9. AE is 5x+6y= 15+18. So AE is 33. Did I ...
*April 16, 2015*

**geometry**

I tired but answers don't make since. Problem is segment CD is perpendicular bisector of segment AB. Need to find lengths of AC (9y-6), AD (3x), and AE ((5x +6). Others: BE=(5x+ y), BD (x + 10) and CB (7y). Figure like a kite. HELPPPPPPPPPP.
*April 15, 2015*

**geometry**

I tried to figure this problem out, Did I do it correct? m<XWY = 2x+5, m<YWZ = 5x-79, m<XWZ = 122 degrees. m<XWZ = ? I got 28. (2x+5)+ (5x-79 = 122 degrees. 7x = 196 = 28. Did I do It right?
*April 14, 2015*

**Chemistry**

The thermochemical equation which is associated with ∆H°f, the standard enthalpy of formation, for urea, CO(NH2)2 (s), is: CO (g) + 2NH3 (g) --> CO(NH2)2 (s) + H2 (g) CO (g) + 2H2 (g) + N2 (g) --> CO(NH2)2 (s) C (s) + O (g) + N2 (g) + 2H2 (g) --> CO(NH2)2 (s...
*March 27, 2015*

**math**

which mixture is more blue? 4gallons primer over 8 gallons paint or 3 gallons primer over 5 gallons paint
*March 24, 2015*

**math**

Thank you ms.sue
*September 14, 2014*

**math**

at 1:00
*September 14, 2014*

**math**

4 hours at 2:00
*September 14, 2014*

**math**

I can multiply 12 by 20 and get 240, is that correct
*September 14, 2014*

**math**

I don't know
*September 14, 2014*

**math**

Clark is cooking a 12 pound ham. The ham needs to be cook 20 minutes for each pound. Clark wants to serve the ham at 5 p.m. What is the latest time he should place the ham in the oven.
*September 14, 2014*

**math**

Riley wants to raise $2550 for a fundraiser walk. He needs to ask people to pledge money for each mile that he walks. How many people will he need to get pledges from in order to reach his goal.
*September 14, 2014*

**math**

82 71 60 49 38
*September 14, 2014*

**math**

82, 71, 60, 45, 30
*September 14, 2014*

**math**

Complete the pattern 82,71,60,?,?
*September 14, 2014*

**math**

4, 13, 22, 31, 40
*September 14, 2014*

**math**

Complete the pattern 4,13,22,?, ?
*September 14, 2014*

**math**

Juanita gets on a train at 12:05 p.m. for a 576 miles trip. Her train travels the entire distance at an average speed of 72 miles per hour. A t what time does she arrive at her final destination.
*September 14, 2014*

**math**

you are ordering pizza for a party. One pizza serves 8 people. You are expect that there be 35 people. How many pizzas should you order.
*September 14, 2014*

**chemistry**

A 14.0 kg sample of lead is measured out at 4 degrees celcius what is the specific gravity of lead?
*September 10, 2014*

**math **

which numbers should you add to estimate the answer to this problem: 87,087 + 98.000 - 88,000+ 98,000 -85,000+95,000 - 87,000 +98,000 - 80,000+ 90,000 thanks for your help!
*August 18, 2014*

**Math**

A factory produces fuses, which are packaged in boxes of 16. Three fuses are selected at random from each box for inspection. The box is rejected if at least one of the three fuses is defective. What is the probability that a box containing six defective fuses will be rejected?
*July 10, 2014*

**Philosophy**

1. d
*July 10, 2014*

**chemistry**

What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?
*February 20, 2014*

**Algebra**

Gustav’s father is seven times as old as he is. A year ago, he was nine times as old as Gustav. Find Gustav’s present age.
*January 21, 2014*

**7th grade English**

Is it themselves
*December 5, 2013*

**7th grade English**

Ok one more I need to ask you. The Great Lakes (they, themselves) are Babe's drinking water.
*December 5, 2013*

**7th grade English **

Use the correct pronoun in parentheses. The book ( it, itself) is a collector's item. Please help. Thanks.
*December 5, 2013*

**science(please check answers)**

@queenelsa #12 is b and #13 is d and yes they are all correct I finished and I got 'em all right!
*December 4, 2013*

**physics**

If my kinetic coefficient and static coefficient are both 1.02, how can I explain why they are the same???? (For a horizontal surface)
*October 22, 2013*

**Physics**

If the gravitational force between objects of equal mass is 2.30x10^-8 N when the objects are 10.0m apart, what is the mass of each object?
*October 15, 2013*

**chemistry**

Actually I solved it - and just to clarify what Dr. bob was doing: dHrxn = (n*dH SO3) - (n*dH SO2) where n is equal to 2 based on the stoichiometric equation 2SO2 + O2 ==> 2SO3 Indeed, Find dHf SO3 and dHf SO2 in tables in your text or notes. Then, the number of moles of ...
*October 15, 2013*

**Chem**

Dr. Bob, I don't think this is the answer. It's close, but I think there is another step. Could you elaborate on your answer to make it more clear?
*October 15, 2013*

**Physics **

A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?
*October 10, 2013*

**Physics **

A projectile is fired off a 35m cliff at 18m/s. what horizontal distance does the projectile travel before hitting the ground?
*October 10, 2013*

**Physics **

a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity
*October 10, 2013*

**chemistry lab**

obtaining a smaller amount of sio2 than was present in the original sample
*October 4, 2013*

**chemistry lab**

list the possible manipulation errors that might contribute in obtaining a significantly larger amount of nacl than was present in original sample
*October 4, 2013*

**Math**

I really don't know the answer?
*September 15, 2013*

**Science - physics**

Ms. Sue I hear you are good with these problems could you be of assistance for this one? Thank you!
*September 3, 2013*

**Science - physics**

Imagine you need to deliver a piano over three steps. A longer ramp translates into less force necessary to raise the piano's height than a shorter ramp would require. Calculate the percentage smaller a force would be required using an 2.8m long ramp compared to a 0.9m ramp?
*September 3, 2013*

**American Goverment**

Despite their differences, the Founding Fathers all agreed that _____. democracy was the most important political value the Constitution should balance order, liberty, and popular sovereignty freedom must be protected at all costs a monarchy should be established to ensure orde
*August 24, 2013*

**American Goverment**

Philadelphia, Pennsylvania was NOT _____. the location the 1787 Constitutional Convention. the city where the Declaration of Independence was signed the childhood home of Thomas Jefferson and John Adams an important city in colonial America 22. For the first eleven years of ...
*August 24, 2013*

**chemistry**

The H3o+ concentration of a solution is found to e 3.40*10^-6. What is the pH of the solution? what is the H3O+ concentration? what is the OH- concentration? is this and acidor a base?
*June 6, 2013*

**chemistry**

If 37.0 mL of HCl is used to neutralize 25.0 mL of 0.09345M LiOH. What is the concentration of the acid
*June 6, 2013*

**chemistry**

If 37.0 mL of HCl is used to neutralize 25.0 mL of 0.09345M LiOH. What is the concentration of the acid
*June 6, 2013*

**chemistry**

If 7.50 mL of 0.100M HCl is mixed with 12.5mL of NaOH. What is the concentration of the base
*June 6, 2013*

**Science**

300 mm Hg
*April 13, 2013*

**Physical sciences**

What is the universal law?
*March 21, 2013*

**poetry**

What is the authors tone in the poem arithmetic?
*March 4, 2013*

**math**

the product of 16 and c is increased by 6 to equal the qoutient 25 and 9. what is c?
*February 7, 2013*

**physics**

A collision occurs between two pucks on an air-hockey table. Puck A has a mass of 0.020 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.040 kg and is initially at rest. The collision is not head-on. After ...
*January 13, 2013*

**Physics**

A 4.90-kg ball, moving to the right at a velocity of +2.50 m/s on a frictionless table, collides head-on with a stationary 8.00-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 4.9-kg ball = 8-kg ball = (b) completely ...
*January 13, 2013*

**Algebra 1**

thank you!!
*January 11, 2013*

**Algebra 1**

ignore the w= l + 6= < 36!!
*January 11, 2013*

**Algebra 1**

Okay one last one that I've spent all night truing to figue out. 2. The width of a rectangle is 6 cm longer than its length. Its perimeter is more than 36 cm. Let l equal the length of the rectangle. a. for the width in terms of the length. W= l + 6= <36 b. Write an ...
*January 11, 2013*

**Algebra 1**

So as I was doing me hw, I ran into this question, and I cant figure it out... Anyone wanna try? 7. The ratio of the perimeters of two triangles is 2:5. The perimeter of the larger triangle is 20 cm. What is the perimeter of the smaller triangle?
*January 11, 2013*

**Algebra 1**

Okay. So I am completely lost with this... Any help would be great! 3. Solve the system using any method – graphing, substitution, or linear combination. Make sure to show your work. 2x + 5y= 8 x + 3y= 2
*January 10, 2013*

**Calculus**

the area of the first quadrant region bounded by the y-axis, the line y=4-x and the graph of y=x-cosx is approximately: a) 4.50 square units, b) 4.54 square units, c) 4.56 square units, d) 4.58 square units, e) 5.00 square units
*January 9, 2013*

**calculus**

A ball is thrown vertically upwards from a height of 6 ft with an initial velocity of 60 ft per second. How high will the ball go? Note that the acceleration of the ball is given by a(t)= 32 feet per second per second.
*December 6, 2012*

**geometry**

What is the endpoint of a segment with endpoints -33 and 47?
*November 2, 2012*

**physics**

You drive a car for 2.0 h at 35 km/h, then for another 2.0 h at 64 km/h. (a) What is your average velocity? (b) What is your answer if instead you drive 99 km at each of the two speeds?
*October 23, 2012*

**physics**

An engineer must design a runway to accommodate airplanes that must reach a ground velocity of 60 m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.1 m/s2. (a) How long will it take the planes to reach takeoff speed? s (b) ...
*October 23, 2012*

**physics**

Engineers are developing new types of guns that might someday be used to launch satellites as if they were bullets. One such gun can give a small object a velocity of 2.9 km/s, moving it through only 1.6 cm. (a) What acceleration does the gun give this object? (b) Over what ...
*October 23, 2012*

**physics**

A supersonic jet flying at 137 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 20.0 s. (a) What is its final velocity? (b) The speed of sound in air is 331 m/s. How many times the speed of sound is the plane's final speed?
*October 23, 2012*

**physics**

You drive a car for 2.0 h at 35 km/h, then for another 2.0 h at 64 km/h. (a) What is your average velocity? (b) What is your answer if instead you drive 99 km at each of the two speeds?
*October 23, 2012*

**physics**

A car is moving down a street at 51 km/h. A child suddenly runs into the street. If it takes the driver 0.62 s to react and apply the brakes, how many meters will the car have moved before it begins to slow down?
*October 23, 2012*

**physics**

A car with a velocity of 19 m/s is accelerated uniformly at the rate of 1.8 m/s2 for 6.8 s. What is its final velocity?
*October 23, 2012*

**physics**

A car with a velocity of 19 m/s is accelerated uniformly at the rate of 1.8 m/s2 for 6.8 s. What is its final velocity?
*October 23, 2012*

**4th grade math**

im stipus
*October 19, 2012*

**government**

Ms Sue those are all my choices i have read and read but cant find my answer but i think B C D might be the answer are one of them the answerws
*October 15, 2012*

**Chemistry**

The mass of a single uranium atom is 4.70E-22 grams. How many uranium atoms would there be in 167 milligrams of uranium?
*October 6, 2012*

**Physics**

11486N. Find velocity 24/0.14= 171.4m/s^2 Then F=MA 171.4*67=11485.71
*October 5, 2012*

**Math**

Mr. Frank is shopping for carpet for his living room and dining room. The living room is 20 feet by 16 feet and the dining room is 11 feet by 10 feet. He looked at two differently priced carpets. One for $14.99 a square yard installed and another for $19.99 a square yard ...
*September 17, 2012*

**Math**

Thank you
*September 13, 2012*

**Math**

Conrad taxi service charges $1.50 for the first mile and $0.90 for each additional mile. How far can Mr. Kulp go for $20 if he gives the driver a $2 tip. Write a let statement; represent the additional miles in terms of the total travelled. Write an equation... Is ithe answer...
*September 13, 2012*

**grade six math**

7,555,333
*September 13, 2012*

**American Government**

True or False? About 75 % of those eligible to vote did so in the 2000 presidential election?
*September 10, 2012*

**Health**

what is it
*August 29, 2012*

**Math**

Last week Frank worked as a waiter for 6&1/4 hrs, earning $9.80 per hour. He also earned $14.50 per hour delivering packages for 7&1/2 hours. How much money did he earn last week?
*May 31, 2012*

**Math**

Casey paid $45 for one new tire and one used tyre for his bicycle. The new tire costs $17 more than the used tire. How much did the new tire cost? I have worked out the answer in my head, ($31) but is there a particular formula I can use or follow.
*May 31, 2012*

**childcare**

I guess no1 wants 2 answer me Thanks anyways
*May 8, 2012*

**childcare**

Can any1 let me know if my answers are correct
*May 8, 2012*

**childcare**

My Answers are-- 1.d 2.d 3.c 4.b 5.a
*May 8, 2012*

**childcare**

1. A child who moved from throwing a ball using only an elbow movement to throwing a ball using her elbow, wrist, and shoulder is showing signs of ______development. a.intertask b.spatial c.joint-plate d.intratask 2. According to Leeds, at snack time, children should be given ...
*May 8, 2012*

**Living a Healthy Life**

I mean d.
*May 8, 2012*

**Living a Healthy Life**

My answer was c
*May 8, 2012*

**Living a Healthy Life**

Some child psychologists have concluded that _________ is the strongest predictor of both scholastic and career achievement. a.physical illness b.respect for authority c.emotional well being d.inherted intelligence
*May 8, 2012*

**child care**

Some child psychologists have concluded that _________ is the strongest predictor of both scholastic and career achievement. a.physical illness b.respect for authority c.emotional well being d.inherted intelligence My answer-d
*May 7, 2012*

**Living a Healthy Life**

Thank you for you help
*May 7, 2012*

**Living a Healthy Life**

children should not be served drinks in containers made of... a. styrofoam b. uninsultated paper c. treated ceramic d. stainless steal My Answer is... b.
*May 7, 2012*

**Living a Healthy Life**

It doesnt make sense for it to be any, a. b. or d
*May 7, 2012*

**Living a Healthy Life**

Im confussed
*May 7, 2012*

**Living a Healthy Life**

In my book it says Biological Hazards are Arachnids,Spiders make up the majority of these
*May 7, 2012*

**Living a Healthy Life**

Is it Biological?
*May 7, 2012*

**Living a Healthy Life**

1.When playing outside, children should wear protective clothing and play in shaded areas to a.avoid radiation from sunlight b.avoid being stung or biteen by insects c.prevent attacks of scabies d.stay cool and maintain psychological My Answer - C 2. What type of hazard is a ...
*May 7, 2012*

**Living a Healthy Life**

2.Temperatures in child care education setting should be set at __ in the summer and __ in the winter. 1. 55 to 65, 65 to 85 2. 60 to 63, 70 to 73 3. 68 to 72, 65 to 75 4. 72 to 80, 70 to 80 My answer is... 2. 60 to 63,70 to 73 Pls let me know if this is correct Thank you
*May 7, 2012*