Monday

January 23, 2017
Total # Posts: 1,154

**Physics (Energy and Momentum)**

A 4400 kg rocket is set for vertical firing. If the exhaust speed is 1500 m/s, at what rate (in kilograms/second) must the gas be ejected to supply the thrust needed to give the rocket an initial upward acceleration of 23.0 m/s^2? Not sure where to start.

*April 17, 2012*

**Physics (Energy and Momentum)**

A body of 5.10 kg mass makes an elastic collision with another body at rest and continues to move in the original direction, but with one-fourth of its original speed. What is the mass (in kilograms) of the struck body? Assuming a perfectly elastic collision, KEi=KEf ive tried...

*April 16, 2012*

**Physics Mechanics (unsolved)**

An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in meters/second) of ...

*April 13, 2012*

**Physics (Mechanics) - unanswered**

An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in meters/second) of ...

*April 13, 2012*

**Physics (Mechanics)**

An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in meters/second) of ...

*April 12, 2012*

**physics (mechanics)**

A running man has half the kinetic energy of a boy half his mass. The man speeds up by 1.30 m/s and then has the same kinetic energy as the boy. What is the speed (in meters/second) of the boy?

*April 12, 2012*

**Math 1200**

a complex has 205 apartment units. When the rent is $635 per month all 205 units are occupied.Assume that for each $75 increase in rent 15 units becomes vacent. Assume that the number of occupied units is a linear function of the rent. Each occupied unit also requires an ...

*April 5, 2012*

**Math**

Jim has 400 ft of fence material and needs to enclose an area of 10,000 square feet for his garden as the diagram depicts. (The length of the house is 62 ft and the fence extends the same distance on either side of the house.) What must the dimensions of the rectangular ...

*March 27, 2012*

**Physics**

In the dangerous "sport" of bungee-jumping, a daring student jumps from a balloon with a specially designed elastic cord attached to his waist, as shown in Figure P5.77. The unstretched length of the cord is 25.0 m, the student weighs 675 N, and the balloon is 36.0 m...

*March 25, 2012*

**Math**

in a group of 30 students,20 are male,15 are from southern region,9 from the central and 6 from the north.if the proportion of female students is the same for each region,how many students are either female or from the central{or both}A.9 B.10 C14 D.16 E.19

*March 23, 2012*

**Maths**

Taona and Stella both live 5km from the Hospital,stella walks at a speed of 4km/hr,while taona cycles.if stella leaves home 45minutes earlier than Taona,they arrive at the same time.how fast does Taona cycle

*March 20, 2012*

**Maths**

A shopkeeper sells a hat for $14.the amount he gains is three times the amount he loses when he tries to sell it for $8.find the cost price? A.9 B.8.5 C.9.5 D.11 E.10

*March 20, 2012*

**Maths**

A steel bar 3.6m long is in the form of a triangular prism.its section is right angled i sosceles triangle with sides 50mm.the volume of the bar in cubic meters is? A.0.045 B.0.0045 C.0.0125 D.0.018 E.0.00125

*March 20, 2012*

**Math**

A product costs k100,90% of the price being production cost,the remainder being tax.if the government raises the tax by 50%,by how much in % will the factory have to reduce its production cost,to keep the price still at k100? A.5 B.85/90 C.50/9 D.85/15 E.15

*March 19, 2012*

**Chemistry**

I keep getting the equation wrong!

*March 14, 2012*

**chemistry**

I had similar problem, except correct choices were 2A(g)+B(s)->3C(g) and A(g)+B(g)->3C. Just wanted to thank Dr.Bob for explaining how it actually works.

*March 14, 2012*

**4th grade math**

Go to google Type in 5/6*288. "Of" means to multiply 5/6*288=240

*March 12, 2012*

**algebra**

you just distribute across. 1/4 = .25 .25(n+5) = .25n + .25(5) = .25n +1 = 1/4n + 1

*March 12, 2012*

**Physics (dynamics)**

A 47.0 kg slab rests on a frictionless floor. A 18.0 kg block rests on top of the slab. The static coefficient of friction between the block and the slab is 0.50, while the kinetic coefficient of friction is 0.40. The top block is acted upon by a force of 120 N. What is the ...

*March 10, 2012*

**Chemistry**

If Kc = 0.480 at 40.°C and Kc = 0.630 at 90.°C, what is ΔH° for the reaction? X<---->Y

*March 10, 2012*

**tax**

For the current year, Sheila Jones had adjusted gross income of $100,000. During the year, she contributed $6,000 to her church and an additional $3,000 to qualified charities. She also contributed religious artwork with a fair market value of $60,000 and a basis of $20,000 to...

*March 8, 2012*

**tax**

Under a court-ordered decree of separate maintenance executed in 2011, Rebecca is required to pay her ex-husband, Carl, $5,000 a month until their youngest son turns age 18. At that time, the required payments are reduced to $2,500 per month. How much of each payment is ...

*March 8, 2012*

**Accounting**

For the current year, Sheila Jones had adjusted gross income of $100,000. During the year, she contributed $6,000 to her church and an additional $3,000 to qualified charities. She also contributed religious artwork with a fair market value of $60,000 and a basis of $20,000 to...

*March 8, 2012*

**Accounting**

Which of the following expenses is deductible, but subject to the 2% limitation on Form 1040, Schedule A; Job Expenses and Most Other Miscellaneous Itemized Deductions? A. A blue suit for an accountant b. Uniforms for a UPS delivery person c. The cost of hauling tools to work ...

*March 8, 2012*

**Calculus**

Find the local linearization of f(x) near x=0 and use it to approximate the value of a. f(x)=sqrt((b^2)+x) a=sqrt(26)

*March 8, 2012*

**Calculus**

Glenview Community College wants to build a rectangular parking lot on land bordered on one side by a highway. It has 380 feet of fencing to use on the other three sides. What should be the dimensions of the lot if the enclosed area is to be a maximum?

*March 8, 2012*

**physics**

The figure shows a golf ball passing through a windmill at a miniature golf course. The windmill has 8 blades and rotates at an angular speed of 2.02 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball of diameter 3.27 x 10-2 m is just ...

*March 8, 2012*

**tax**

during 2011 sam paid following: property tax on residence (paid from escrow account) $1550 Property tax portion of car registration (based on value) $400 property taxes on land held for long term appreciation $350 What amount can Sam deduct as property taxes in calculating his...

*March 7, 2012*

**Mechanics M1**

is the same thing if in problem say "at angle ? degrees parallel to the river bank"

*March 7, 2012*

**Maths**

increasing orignal price of an article by 15% and then increasing the new price by 15% again is equivalent to increasing the orignal price by what %?

*March 6, 2012*

**chemistry**

what is the answer?

*February 29, 2012*

**math**

Cierra arrived at her dance at 9:05. She waited in the classroom for 10 minutes and them the class began. If the class ended 1 hour 10 minutes later,at what time did the class end? A.10:15 B.10:20 C.10:25 D.10:30 C?

*February 23, 2012*

**math**

The table shows the total number of emails that the Wright family received this morning. Mr.Wright 7 emails Mrs.Wright 8 emails Cole 3 emails Trinity 3 emails If the family receives 7 more emails,which is the most reasonable prediction of the number of emails that will go to ...

*February 23, 2012*

**Economics**

Consider an economy with the following aggregate demand(AD) and aggregate supply(AS) schedules. These schedules reflect the fact that, prior to the period we're examining, decisions makers entered into contracts and made choices anticipating that the price level would be ...

*February 22, 2012*

**Economics**

Consider an economy with the following aggregate demand(AD) and aggregate supply(AS) schedules. These schedules reflect the fact that, prior to the period we're examining, decisions makers entered into contracts and made choices anticipating that the price level would be ...

*February 22, 2012*

**Chem**

What about the second part? plz and thank you

*February 21, 2012*

**Chem**

In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 41.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse osmosis stops? ...

*February 21, 2012*

**Science**

Are all solutions mixtures? Are all mixtures solutions? Explain with examples. I put all solutions are mixtures but all mixtures aren't solutions. I don't know how to explain it with examples

*February 21, 2012*

**Math**

The graph shows the number of airplanes that flew out of an airport last week Mon=4airplanes Tues=7airplanes Wed=3airplanes Thu=8airplanes Fri=5airplanes If each airplane carried 120 people then how many people flew out of the airport last week? A.3240 B.3140 C.1080 D.880 B?

*February 21, 2012*

**algebra**

write an absolute value inequality describing the minutes of data (w) a full dvd will hold if a typical dvd can store between 137.9 and 142.1 minutes of data before it is considered full

*February 20, 2012*

**math**

Thanks Cheryl :-)

*February 18, 2012*

**math**

In a sports league of n teams in which each team plays every other team twice, the total number N of games to be played is given by N = n2 - n. What is the total number of games to be played in a football league having 17 teams?

*February 18, 2012*

**chemistry**

Pb(OH)2 (s) + 2NaOH (aq) <--> [Pb(OH)4]^2- + 2Na^+ (aq) Don't include the "-" in NaOH

*February 13, 2012*

**Math**

Adam has $300 when he entered the store. He spent $72 on some CD's. He wants to use the rest of the money to buy some DVD's. If DVD's cost $18 each, which would be the best way for Adam to find how many DVD's he can afford to buy? A.Multiply 18 by 72 B.Add 300 ...

*February 8, 2012*

**Math**

I mean 6 for 2

*February 8, 2012*

**Math**

Nathan can purchase 5 lemons for $2. Which is one way to find the number of lemons Nathan can buy with $20? A.add 6 and 2 and then multiply the sum by 20 B.add 2 and 20 and then multiply the sum by 6 C.divide 6 by 2 and then add the quotient to 20 D.divide 20 by 2 and then ...

*February 8, 2012*

**physics**

A 790kg boulder is raised from a quarry 188m deep by a long uniform chain having a mass of 600kg . This chain is of uniform strength, but at any point it can support a maximum tension no greater than 3.00 times its weight without breaking.

*February 8, 2012*

**Science**

What is concluded about one of Mendel's short pea plants? A.It had one dominant and one recessive gene B.It had a pair of recessive genes C.It had a pair of dominant genes D.It had no recessive genes B?

*February 7, 2012*

**Science**

What can you conclude about Gregor Mendel? A. The Catholic Church forced him to stop his experiments B. He was one of the first researchers to establish how heredity worked C. He concluded that heredity worked for people as well as plants D. He established all the principles ...

*February 7, 2012*

**Science**

What is concluded about one of Mendel's short pea plants? A. It has one dominant and one recessive gene B. It has a pair of recessive genes C. It has a pair of dominant genes D. It has no recessive genes A?

*February 7, 2012*

**Science**

Which of the following is inherited? A. The shape of your blood cells B. Your intelligence C. Your personality D. Your weight A?

*February 7, 2012*

**Science**

What environmental niche is most suitable for an animal that eats fruit? A.artic tundra B.temperate swamp C.temperate plains D.tropical forest D? Which of these is NOT an adaptation for the Fennec Fox? A.beige coat to camoflauge B.small ears to prevent heat loss C.hunting ...

*February 6, 2012*

**Science**

What environmental niche is most suitable for an animal that eats fruit? A.artic tundra B.temperate swamp C.temperate plains D.tropical forest D? Which of these is NOT an adaptation for the Fennec Fox? A.beige coat to camoflauge B.small ears to prevent heat loss C.hunting ...

*February 6, 2012*

**Science**

Which of these structural adaptations would most help a nocturnal animal living in the forest? A.smaller eyes B.longer hind legs C.darker fur D.wings C? Which of these changes would most help a plant living in a desert? A.more leaves B.more roots C.smaller stem D.smaller ...

*February 6, 2012*

**Math**

Ms.Taylor sells roses for $2.00 each or $12.00 per dozen. What is the greatest number of roses a customer can buy with $30.00? A.14 B.24 C.27 D.30 C?

*February 6, 2012*

**Math**

The cafeteria has 16 tables. Each table can seat 14 students. What is the greatest number of students that can be seated at one time? A.30 B.80 C.204 D.224 D?

*February 6, 2012*

**Math (algebra)**

It takes 5 people 24 min to set up all the tables in the restaurant. how long will it take 3 people to set up all the tables? With formula please.

*February 5, 2012*

**Spanish crossword**

Opposite of getting off plane. Starts with R and is 14 letters.

*February 4, 2012*

**statistics**

If a value of 64 is given and the standard deviation is 5 what is the range

*February 3, 2012*

**physics**

A 0.500 ice puck, moving east with a speed of 6.70 , has a head-on collision with a 0.700 puck initially at rest. Assuming a perfectly elastic collision, what will be the speed of the 0.500 object after the collision? What will be the speed of the 0.700 object after the ...

*February 2, 2012*

**math**

x = 5

*February 2, 2012*

**History**

What are the most poisonous animals in the world and also one of the smallest?

*February 1, 2012*

**ethics**

If you were appointed Patient Advocate for a close relative (parent, sibling, spouse, child, etc.) would you be able to carry out their wishes, including a wish to end their life. Would age or disability make a difference in your ability to serve as their patient advocate?

*February 1, 2012*

**Science**

Ok. Thanks!

*February 1, 2012*

**Science**

Which of the following is an example of an inherited trait? A. Migration in geese B. Hunting behavior of tigers C. A child riding a horse D. A dolphin jumping through a hoop A? An orangutan is trying to catch a fish with a long pointed tool. Which of the following describes ...

*February 1, 2012*

**Math**

Thank you Ms. Sue! :)

*February 1, 2012*

**Math**

Corey jogs 5km every morning to get ready for a 5km race he is going to run next month. How many meters does Corey run in one week? A. 5000m B. 10000m C. 3500m D. 35000m D? Mrs.Sharp made a punch recipe that called for 20 fluid ounces of cherry juice. How many cups of cherry ...

*February 1, 2012*

**Math**

Rashad awoke at 6:45A.M. He spent a half hour taking a bath and getting dressed. He took 20 minutes to eat his breakfast and another quarter of an hour to ride his bike to school. What time did Rashad arrive at school? A.7:55A.M. B.7:45A.M. C.7:50A.M. D.7:40A.M. C?

*February 1, 2012*

**Math**

Quintera and her family were flying from New York to Florida. Their plane departed at 10:155A.M. and arrived in Florida at 1:37P.M. How long was Quintera's flight? A. 9h 18min B. 14h 42min C. 3h 42min D. 2h 42min D?

*February 1, 2012*

**Math**

It took Chef Flay 3/4 hour to buy groceries and 1 1/2 hours to prepare a meal. How many minutes did it take Chef Flay to shop and prepare the meal? A.225minutes B.120minutes C.150minutes D.135minutes D?

*February 1, 2012*

**Science**

Which of the following describes a learned behavior? A. A cat nursing its kittens B. A parrot singing words to a song C. A mocking bird building a nest D. A zebra's black and white stripes. B?

*February 1, 2012*

**Math**

1.Angie's horse ran 3 miles in a race at the county fair. How many yards did her horse run? A.528yd B.5,280yd C.15,840yd D.1,584yd B? 2. What is the relationship between 75cm and 1m? F.75cm is 3/4 of 1m G.75cm is 1/4 of 1m H.75cm is 1/2 of 1m J.1cm is 2/3 of 75m F? 3. ...

*January 31, 2012*

**Math**

Angie's horse ran 3 miles in a race at the county fair. How many yards did her horse run? A.528yd B.5,280yd C.15,840yd D.1,584yd B? 2. What is the relationship between 75cm and 1m? F.75cm is 3/4 of 1m G.75cm is 1/4 of 1m H.75cm is 1/2 of 1m J.1cm is 2/3 of 75m F? 3. Kitty ...

*January 31, 2012*

**science**

How much work is done by an applied force that moves two charges of +7.8 µC that are initially very far apart to a distance of 3.8 cm apart

*January 31, 2012*

**Math**

3/4 is 45 minutes?

*January 31, 2012*

**Math**

I don't get how much 3/4 is in an hour.

*January 31, 2012*

**Math**

Catherine's dental appointment took 3/4 hour. She left the dentist at 11:10 A.M. What time did her appointment begin? F. 11:40A.M. G. 11:55A.M. H. 10:25A.M. J. 10:55A.M

*January 31, 2012*

**Math**

of 250 candidates writing a exam, 147 passed in math,150 pass in chemistry and 85 pass subjects B)calculate the number of students who pass i)pass math only ii)pass chemistry only iii)passed neither iv)pass only one subject

*January 30, 2012*

**Math**

5(-3x - 2) - (x - 3) = -4(4x + 5) + 13 Answer Multiply factors. -15x - 10 - x + 3 = -16x - 20 +13 Group like terms. -16x - 7 = -16x - 7 Add 16x + 7 to both sides and write the equation as follows 0 = 0

*January 30, 2012*

**Science**

Examples of seed dispersal Animals carry seeds away carried by the wind animal waste carried by water stuck to fur/clothes Any others?

*January 30, 2012*

**set**

of 250 candidates writing a exam, 147 passed in math,150 pass in chemistry and 85 pass subjects B)calculate the number of students who pass i)pass math only ii)pass chemistry only iii)passed neither iv)pass only one subject

*January 30, 2012*

**sets**

in a school, 37% of the pupils study principle of accounts and 28% study principal of business. if 15% study both business subjects what percentage of the pupils do not study neither, study P.O.B only and study P.O.A only

*January 30, 2012*

**Math**

In the figure below, the diagonal line divides the rectangle into halves Which statement about the figure is NOT true? On the rectangle the width is 3cm and the length is 4cm. The line that divides the rectangle is 5cm F. The perimeter of the rectangle is 14cm G. The area of ...

*January 30, 2012*

**ELA**

Nevermind :)

*January 30, 2012*

**ELA**

Ms. Sue, can you scroll down to my other ela question?

*January 30, 2012*

**ELA**

Thanks

*January 30, 2012*

**ELA**

Find the prepositional phrase in each sentence 1. There was a town that did without television. Answer:without television 2. Most people in town stopped watching TV. Answer:in the town 3. They did not watch television for a whole week. Answer:for a whole week 4. During that ...

*January 30, 2012*

**ELA**

Is throughout the West a prepostional phrase?

*January 30, 2012*

**ELA**

Is In 1849,gold a prepositional phrase? Cause In is a preposition

*January 30, 2012*

**ELA**

These are the ones I found 1.at Sutter's Mill 2.in California 3.of settlers 4.with everything they owned 5.in wagon trains 6.on the Oregon Trail 7.for wealth 8.in towns Are these correct so far?

*January 30, 2012*

**ELA**

Read the social studies article about the gold rush below. Then list the prepositional phrases on the lines. Underline the object of the preposition in each phrase In 1849, gold was discovered at Sutter's Mill in California. Thousands of settlers headed west. They left ...

*January 30, 2012*

**Math**

Thank you

*January 30, 2012*

**Math**

I think I do cause area is finding how much of the space you used on something. So you're trying to find in B how much paper can go into the bulletin board

*January 30, 2012*

**Math**

It's not D cause it's estimating and we're talking about area so it's B?

*January 30, 2012*

**Math**

Which of the following would require finding the area? A. Determining the number of sugar cubes in a box B. Determining the amount of paper needed to cover a bulletin board C. Determining the length of trim needed to go around the edge of a bulletin board D. Determining the ...

*January 30, 2012*