Friday

April 25, 2014

April 25, 2014

Total # Posts: 104

**CHEMISTRY**

Consider the reaction N2+O2-->2NO with Delta H=43.2kcal. When 50.0g of N2 react with an excess of oxygen, how much heat is generated/consumed? I know that this is an endothermic reaction b/c of the + delta H, is there some sort of formula to use here? I have no idea where t...

**physics**

What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? a_{max} =

**Astronomy**

1) 13933.27AU from 2*(a/1AU)=2*(P/1yr)^2/3 2) 377km/s

**Physics - PLEASE HELP**

A 25-kg uniform ladder 10-m is leaning against a frictionless wall. The ladder is making an angle of 32° to the ground. What is the magnitude of the total force exerted on the ladder by the ground? 675 N 462 N 245 N 543 N 314 N

**Physics**

A 30-kg uniform ladder 12 m long is leaning against a frictionless wall at an angle of 50 degrees above the horizontal. A 45-kg boy climbs 5.0 m up the ladder. What is the magnitude of the force exerted by the ladder on the wall?

**physics**

A block of mass 4.44 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 6.55kg which hangs in the air , as shown above. Assume the cord to be light (massless and weightless) and unstretchable and the pu...

**Math**

In the expression A(x+5)+2(−Bx+2), the coefficient of x is 17 and the constant term is 219. What is the value of A−B?

**Math**

5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the three consecutive odd numbers?

**Algebra**

5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the three consecutive odd numbers?

**Math**

In the expression A(x+5)+2(−Bx+2), the coefficient of x is 17 and the constant term is 219. What is the value of A−B?

**Chemistry**

Write the formula of CH3NH+3 conjugate base. and Indicate whether the conjugate base of CH3NH+3 is a strong base, a weak base, or a species with negligible basicity.

**English**

Thank you, Ms. Sue!

**English**

I"m having difficulty correctly addressing the below sentences. The assignment is to fix, if needed, sentence fragments. At first and second glance, I feel these are correct: With machetes, the explorers cut their way through the tall grasses to the edge of the canyon. Th...

**Criminal Justice**

Uncle Bob's vacation discuss the possible communications methods between the officer and his/her agency

**math**

Maribel's city imposes a tax that is 40% of the state tax she pays. Her taxable income is $198.50 per week. Her state imposes tax at a rate of 5%. How much state and local tax is withheld from her weekly pay?

**Chemistry**

How many grams of co2 are in 3.92 times 10 to the 24th molecules

**MATH!!**

Andy, Barbara and Chrisy play a game. Their probabilities of winning are 1/2, 1/3, and 1/6 respectively. What is the probability that each wins exatly one of the first three games played? Express your answer as a common fraction.

**math**

6350

**Circle Geometry - chords in a circle**

and the middle chord is not the average of the other two chords.

**Circle Geometry - chords in a circle**

hmm I got 66. I got my radius to be 65 and from there i proceede to solve and got 2(33)=66. My method is that the radius from point O the origin perpendicular bisects the three parallel chords. Using pythagoras theorem, let the distance of perpendicular bisector from O to TU b...

**Circle Geometry - chords in a circle**

hmm I got 66. I got my radius to be 65 and from there i proceede to solve and got 2(33)=66. My method is that the radius from point O the origin perpendicular bisects the three parallel chords. Using pythagoras theorem, let the distance of perpendicular bisector from O to TU b...

**physics**

Two spherical objects are separated by a distance of 1.41 × 10^-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each...

**physics**

An electrically neutral model airplane is flying in a horizontal circle on a 2.0-m guideline, which is nearly parallel to the ground. The line breaks when the kinetic energy of the plane is 50 J. Reconsider the same situation, except that now there is a point charge of +q on t...

**physics**

An electric field of 210000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -6.2C at this spot?

**physics**

Two point charges of the same magnitude but opposite signs are fixed to either end of the base of an isosceles triangle. The electric field at the midpoint M between the charges has a magnitude EM. The field directly above the midpoint at point P has a magnitude EP. The ratio ...

**Math**

In Ms.Ramirez's class, there are 28 students. They sit in 4 rows. How many students are in each row?

**3rd grade Math**

Explain It How can you suse a multiplication fact to find a division fact?

**Math**

Explain It Franklin says that if he divides 50 by 5, he will get 10. Jeff says he should get 9. Who is correct? Explain.

**Math**

Dress rehearsal of the play was attended by 142 people. Opening night was attended by 238 people. How many people saw the two shows in all?

**Math**

Ron painted part of a tiled section of his bathroom floor. the whole section was shaped like a rectangle. There were 35 square tiles in the section. How many tiles were in each row? There are 7 rows

**Math**

Ron painted part of a tiled section of his bathroom floor. the whole section was shaped like a rectangle. There were 35 square tiles in the section. How many tiles were in each row?

**history**

3. Among members of George Washington's cabinet, __________ had a pessimistic view of human nature and a dread of democratic excess. A. Hamilton B. Adams C. Jefferson D. Marshall

**Math**

Explain It Tamara says that 15/3=5. Is she correct? Explain

**Math**

Explain It Ron and Pam each have 20 pennies. Ron will put his pennies into 4 groups. Pam will put her pennies into 5 groups. Who will have more pennies in each group? Explain.

**math**

Sara needs help solving the problem 11x8. Which pattern can she use to help her find the product?

**Math**

Explain it How can you use a pattern to find the product of 5x12?

**math**

write a multiplication story for 9x8. include the product in your story.

**math**

there exists a two digit integer, "AB", such that AB=2(A+B)squared. what is the value of the product A x B?

**math**

the integer 49 can be written as the sum of smaller perfect squares in a variety of ways. one such way includes six terms: 25+9+4+1+1. if each term has a value between 0 and 49,what is the fewest number of perfect square terms that can be added together for a sum of 49?

**math**

what is the least positive integer with exactly 10 factors?

**math**

what is the number of factors of the product 126*216?

**math**

what is the least whole number with exactly eleven factors?

**math**

how many factors of 1800 are multiples of 10?

**math**

five cards are chosen at random from a standard deck of 52 cards. what is the the probability that all five cards are the same suit? express your answer as a common fraction.

**math**

the sum of the squares of four consecutive positive integers is 734. what is the smallest of the integers?

**math**

a 12-slice pizza was made with only pepperoni and mushroom toppings, and every slice has at least one topping. only six slices hav pepperoni, and exactly ten slices have mushrooms. how many slices have both pepperoni and mushrooms?

**math**

the product of three consecutive positive integers is 35,904. what is the sum of the three integers?

**math**

calculate the number of distinct whole number factors of each number...... factors of 18,multiples of 3=

**math**

what is the sum of the two least natural numbers that each have exactly six distinct,positive factors?

**math**

what is the least natural number that has exactly five distinct, positive factors?

**math**

how many prime positive integers are divisors of 555?

**math**

what is the least natural number that has exactly four distinct positive factors?

**math**

anderson will roll two standard six sided dice once. what is the probability that the two numbers rolled will be the same? express your answer as a common fraction

**math**

three consecutive primes are summed. when the sum is squared, the result is 72,361. what is the largest of the three primes?

**math**

how many positive integers less than or equal to 100 have a prime factor that is greater than 4?

**Social studies**

Which century did the industrial revolution start?

**chemistry**

a 10.0L ballon contains helium gas at a pressure of 655mmHg, what is the new pressure, in mmHg, of the helium gas at 20.0L, if no change in temp or amount of gas

**Chemistry**

If PV=nRT, (100)(2x10^-5)=(n)x(8.31)x(300), n is 8.02x10^-7. How did you manage to get the mr of 42?

**Chemistry**

0.0337g of a volatile liquid when vaporized completely at 100Pa and 300K occupied a volume of 20cm3. When this volume of vapor was completely burnt in an excess of oxygen, 40cm3 of carbon dioxide and 20cm3 of water vapor were formed. All volumes being measured at the same temp...

**chemistry**

calculate the energy, in joules and calories required to heat 25.0g of water form 12.5 deg. celcius to 25.7 deg. celcius i know the answer just need to see how to do it especially the calories

**Angermanagement**

You could have hurt a loved one in many different ways: - not being honest - loss of trust - cheating on your partner - abusive tendencies; yelling, physical contact - letting them down Think to a time when your loved one had been angry or sad with your about something. What d...

**Chemistry**

Upon recalculating this you are definitely correct...log(1.6667)=0.22 so 7.2+.22=7.42 and the pH is then 7.42 Thanks again for your help.

**Chemistry**

Okay, so based on the chart in my book I was able to determine the following. pH=(unknown) pKa=7.2 of Phosphoric Acid (2) A-=.5M of Na2HPO4 HA=.3M H2PO4- pH= 7.2 + log(.5/.3) pH=7.2+log(1.6667) pH=7.2+0.5108 So, the pH of this solution is: pH=7.7108 Correct?

**Chemistry**

If a liter of a buffer is prepared with a final concentration of .3M monosodium phosphate and .5M disodium phosphate, what is the pH of this buffer? (Hint: Which is conjugate acid (HA) and conjugate base (A-)? What's the pKa for this particular pair of HA and A-?) So I thi...

**Chemistry**

M = # moles KOH / # kg solvent M = 50.0 moles KOH / 3.4 kg

**Math**

128km

**math**

I believe this is the form I need to use.. sin^2(x)=(1-cos 2x)/(2) I think I need to expand the problem with that, but I'm bit confused how..

**math**

Use the formulas for lowering powers to rewrite the expression in terms of the first power of cosine. sin^6(x) Answer=__________ ~Thank you.

**Math**

Ahh Surprised I didn't see that.. Thank you.. The exact value would be .5773 right?

**Math**

Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value. (tan(π/2)+tan((2π)/3)) / (1-tan(π/2)tan((2π)/3)) Answer=__________ Exact value answer=_________ ~Thank you.. I thought i...

**physics**

An object is dropped onto the moon (gm = 5 ft/sec2). How long does it take to fall from an elevation of 250 ft.?

**math**

LCM of 2t, (t-2) and t(t-2)

**math**

never mind same person

**social studies**

oh, okay!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Can you send me a bettter map!

**social studies**

okay, but I didn't get the map or understand.

**social studies**

Thank you for every single question I've asked you. You're a great teacher Ms.Sue. I learned a lot from you. May god bless you.But, before I go I want to make sure my answers are right for this qustion. Here they go, Louisiana, Texas, Alabama, and Missippi.

**social studies**

My last time if you just answer this queston. Name two states that extend further south than louisiana.

**social studies**

Pretty please. My teachers don't teach me at school.

**social studies**

No url please. what are all the states that the 33rd parallel passes through?

**social studies **

I tried the map you posted and it didn't work.

**social studies **

There's no map in my book. I don't get the map you posted for me.

**social studies **

I still didn't get help on this question. Name two states that extend further south than louisiana. No url please.

**social studies**

No, from Louisiana to pennsylvania? Also, what direction would you go from louisiana to mexico? Lastly, in which direction would you go from louisiana to alaska? No url please, just give me an answer.

**social studies**

Thank you for all your help.In which direction would you go to Louisiana to pennyslvania? Please no url.

**5th grade social studies**

when the government raise taxes the economy goes up as well.If consumers didn't pay taxes we will be down in food supplyment and other goods in stores.

**social studies**

what river name comes from choctaw word meaning "long river"

**social studies**

What river flows to lake borgne?

**social studies**

what river begins in new mexico?

**social studies**

What two states extend further south in louisiana?

**social studies**

Thak you!

**social studies**

what states border Louisiana?

**social studies**

what states border Louisiana? what two states extend further south than Louisiana? what tates have a Gulf of Mexico coastline? Is Louisiana closer to nevada or virginia? What direction would you go from Louisiana to pennyslvania? What direction would you go from Louisiana to M...

**8th grade math**

The area of Manhattan Island is 641, 000,000 square feet. According to legend, the Indians sold it to the Dutch for $24. Estimate the area that was purchased for one cent.

**Economics**

When Burton Cummings graduated with honors from the Canadian Trucking Academy, his father gave him a $350,000 tractor-trailer rig. Recently, Burton was boasting to some fellow truckers that his revenues were typically $25,000 per month, while his operating costs (fuel, mainten...

**math**

$30,000 Total She invested $16,000 x .10 = $1600 She invested $14,000 x .05% = $700 $1600 +$700 = $2300

**7th grade**

The contest _ea__i_e is tommorow.

**health**

Components of health communications I am thinking that they are personal goals, interdepenence, sensitivity, and shared meaning. I just need to know if I am headed in the right direction with this.

**health**

components of Health communications

**Chem**

Calculate the number of moles and number of grams of solute in 250 mL of a 0.10M CaCl2.