Saturday

April 19, 2014

April 19, 2014

Total # Posts: 743

**Physics**

A 0.165-kg ball, moving in the positive direction at 10 m/s, is acted on by the impulse shown in the graph below. What is the ball's speed at 4.0 s?

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg pe...

**SOCIAL STUDIES!!!**

in what ways did whitneys system improve products

**8th grade math**

Add up the ratios 3:7:17 to get 27. Since ratios can be scaled, we can scale the ratios to have a sum of 81 by multiplying the ratios by 3,i.e. 3:7:17 ß 9:21:51.

**SOCIAL STUDIES!!!**

what was eli whitneys main contribution to manufacturing

**SOCIAL STUDIES!!!**

how did slater and lowell contribute to industry in the united states?

**social studies**

how did turnpikes,canals,and railroads affect the way that people in different states interacted

**social studies**

thx :-)

**social studies**

why did railroad construction end canal building

**math**

two horses gallop off in the sam direction. Trigger travels25 kilometers per hour. Silver travels 30 kilometers per hour. How long before the horses are 3 kilometers apart?

**Physics**

4.25sin40= Y component 4.25cos40= X component

**english**

the stems measure a foot in diameter=transitive people use bamboo in many ways=transitive in japan the hollow stems serve as water pipes= transitive

**algebra**

Eight times the opposite of a number is 36 less than the product of 4 and the number. What is the number?

**calculus**

Find the amount of a continuous money flow in which $175 per year is being invested at 8%, compounded continuously for 20 years.

**math**

integrate (using substitution). (6x^5)(e^(x^6))dx

**Stats**

84 and18.2 percnt not likely but 11.2 is likely

**geometry**

Point A is the incenter of (triangle) PQR. Find each measure. ARU AU QPK

**GEOMETRY**

LINE CD IS MEDIAN OF TRIANGLE ABC AND M IS THE CENTROID.MMIF CM = 14 WHAT IS CD

**geometry**

line CD is a median of angle ABC and M is the centroid, If CM = 14 what is CD

**physics**

An airplane flies north at a constant speed for 6h and covers a distance of 2400km. What is the plane's velocity? The acceleration?

**pre-calculus**

A developer wants to build homes on a rectangular plot of land 4 kilometers long and 3 kilometers wide. In this part of the city, regulations require a greenbelt of uniform width along two adjacent sides. The greenbelt must be 10 times the area of the development. find the wi...

**Physics**

A shell is fired with velocity having horizontal and vertical components ux, uy. At the highest point of it's path the shell explodes into two fragments of mass m1, m2, which separate in a horizontal direction. The explosion generates kinetic energy E. Show that the distan...

**fith grade math**

this summer it has rained only 1/4 as much as last summer . 12 inches of rain fell last summer. what amount of rain has fallen this summer

**physics**

Hello, can anyone help me this problem? The author's cat enjoys chasing chipmunks in the front yard. In this game, the cat sits at one edge of a yard that is w = 32 m across (see figure), watching as chipmunks move toward the center. The cat can run faster than a chipmunk,...

**geometry**

find other endpoint of line segment with a given endpoint and midpoint endpoint (2,1) Midpoint (-7, 2)

**math**

i think it's B but i'm not sure

**math**

Max has 12 pairs of socks. Of them, 6 pairs are blue, 3 pairs are brown, and 2 pairs are white. Max wants to know what fraction of the socks are blue or brown. How can he find the numerator? a) Add 6+3+2 b) Add 6+3 c) Subtract 11 from 12 d) Subtract 9 from 12

**math**

you download 12 new songs to your MP3 player. then you delete 5 old songs. write each amount as a integer.

**Chemistry**

Mass of evaporating dish = 41.36 g Volume of saturated NaCl solution = 10.0 mL Mass of evaporating dish and NaCl = 44.50 g Mass of sodium hydrogen carbonate = 0.49g What is the morality(M) of the sodium chloride solution if you prepare in 1 liter of solution? How do you calcul...

**Chemistry**

Why are covalent bonds weak in the presence of heat but strong in the presence of water?

**AP Geography**

That's the only reason I've turned to this site for help. I burnt out on 4 other sections like this and I need help. Ugh.

**AP Geography**

That's the only reason I've turned to this site for help. I burnt out on 4 other sections like this and I need help. Ugh.

**AP Geography**

Oh yes, I do appologize, I have to deal with a reeeeal stupid confusing text book. I have NO idea what Near Abroad is, I didn't know if it was some term I wasn't use to hearing or what. I've been using Russia as a whole country compared to Europe & it's contrie...

**AP Geography**

I need a comparison of Europe's economy versus Russia and the Near Abroad's. I've done like five other topics, writing two or three pages for each, can I just get some quick help? I need three or more idea's I can toss together in words. Websites are welcome.

**Physics**

I had a question actually... why is your Vx related to the sin? and your Vy related to the cos? isn't it usually the other way around?

**Calculus**

When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(-1/2)gt^2+v(sub 0). Find the velocity of the ball when t=0.

**Calculus**

When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(-1/2)gt^2+v(sub 0). Find the velocity of the ball at time t.

**Chemistry**

How do the number of electrons found in the element’s outer shell relate to their position in the period table? -- I have an idea, but I'm not sure how to verbalize it, can you please help? Thanks! :)

**Calculus**

A ball of radius 14 has a round hole of radius 8 drilled through its center. Find the volume of the resulting solid

**AP CHEM**

Comparing the Noble Gases to the Alkaline Metals, what are major similarities and major difference between the two?

**AP HS Chemistry**

I need help. In simple english please, what is Hund's Rule, Pauli Exclusion Principal, and the Aufbau Principal? I need to know these. Please try to be simple as possible because I'm not understanding right now, haha. Thanks!! :)

**geometry**

triangles ABF and EDG are congruent. triangles ABF and GCF are equalateral. AG = 24 and CG = 1/5 AB. find the total distance from A to B to C to D to E

**Physics**

F = ma for the whole bike as a unit. The force F that is causing the bike to move is your resistive force 147N. a = R*alpha, so you should have m=F/R*alpha so m = 147/(.32*4.5) = 102.083 which is the answer given by OP as being correct.

**Physics**

Which of the following contains the most mechanical energy? A 10 kg ball at the top of a hill 10 meters high A 5 kg ball rolling with a velocity of 12 m/s A 10 kg ball rolling with a velocity of 5 m/s A 5 kg ball at the top of a hill 10 meters high I think it is A

**Physics**

Is an airplane flying round trip at a constant speed an example of uniform circular motion or is a record player rotating at a record speed?

**Physics**

Can gravity friction and tension be all centripetal forces?

**Physics**

wait just figured it out pe=mgh

**Physics**

A 5 kg ball is initially at rest at the top of a hill 10m high. If it rolls down the hill (converting all of its potential energy to kinetic energy,) what is the maximum kinetic energy it could have at the bottom of the hill? -I am not sure what formula to use?

**PHYSICS**

ohh i finally get it!

**PHYSICS**

Which machines has more mechanical advantage pulley or incline plane? I asked this question before but did not quite understand the answers that were given to me. I think that the incline plane has more mechanical advantage in a friction less environment.

**PHYSICS**

haha okay thank you for your help!

**PHYSICS**

what would happen if it was a friction less environment?

**PHYSICS**

When you have more pulleys does the mechanical advantage and efficiency increase or decrease?

**PHYSICS**

Does mass affect mechanical advantage in any way?

**PHYSICS**

So the pulley has more mechanical advantage and the incline has more efficiency?

**PHYSICS**

Which simple machine has more mechanical advantage a pulley or a inclined plane? PlEASEE HELP SUPER CONFUSED

**math**

B is the midpoint of segment AC. AB = 5x and BC = 3x + 4. Find AB, BC and AC.

**Math**

If a faucet is dripping at the rate of 7.5 drops per minute and there are 20 drops in a milliliter, how many liters of water are wasted in a 30-day month?

**Math**

An access ramp enters a building 1 meter above ground level and starts 4 meters from the building. How long is the ramp? If it is not possible, write “not possible” and explain why it is not possible.

**AP English Lang. & Comp.**

My Assignment: Read the book, 'Animal Farm' by George Orwell. After reading the book, create a composition that examines the similarities and differences between the Russian Revolution and the events in this novel. Research any other 'rebellions' that have take...

**Chemistry**

Why is iron not used to make surgical and other knives: Explain your reasons.

**Chemistry**

What transitional metal might be suitable to manufacture indestructible spectacle frames: Explain your choice.

**Chemistry**

What is a cathode and an anode? In the formula for table salt: NaCl, which part of the compound is a cathode and which part is the anode? ****** I don't get any of this stuff!?! D: Due tomorrow!! ))):

**physical science**

166.66

**Chemistry**

Is this answer correct? Calculate the molar concentration of sodium hydroxide solution if 36.00mL of this solution were required to neutralize 25.00 mL of a 0.2000 M solution of hydrochloric acid. .0288M??????

**algebra**

Find the value of f(0) if f(x) = x2 - 3x + 2 / x + 1

**algebra**

Simplify the expression: 3x^2 − 3y + 8x − 5x^2 + 12y

**science**

what variables can affect the number of eggs laid by a chicken?

**science**

ok thanks

**science**

what variable can affect the attendance at a football game?

**chemistry**

How many grams of magnesium oxide are produced when 40 grams of oxygen react with magnesium

**Physics**

1. A certain playground merry-go-round is essentially an 90-kg iron disk 2.0 m in radius. Two children, each with a mass of 46 kg, are originally standing on opposite sides of the disk near its outer edge. The merry-go-round is turning essentially without friction about a vert...

**geometry**

oh okay thanks

**geometry**

Which of the following are measurements of the sides of a right triangle? Select one of the options below as your answer: A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above

**geometry**

what is the area of a regular polygon with 13.8 area and 6 sides

**calculus**

When doing a question such as: What is the area of the region enclosed by the graphs of f(x) = x - 2x^2 and g(x)= -5x? what is an easy way to tell if a function is above or under the other, so I can tell which function to put first in the integral. MUCH APPRECIATED!

**math**

Ben has 15 puzzles and 27cds. When he takes a trip, he likes to bring one puzzle and one cd . How many trips can he take with a different puzzle and cd pair

**MATH**

A bike club wants to make license plates for bikes. Each license plate has a letter followed by a digit. How many different license plates can be made?

**math**

Lets try this one last time What is the value for the numerals with letters: 245,189 2=a 5=b 8=c

**Math**

i will retype this question. What is the value for the numerals with letters. 2 4 5, 1 8 9 a.......b........9.....

**MATH**

WHAT IS THE VALUE FOR THE NUMERALS WITH LETTERS 2 4 5, 1 8 9 a b c

**math**

What is the value for the numerals with letters. 245,189 a b c

**MATH**

One side of a rectangle is 53cm another, another side is 29 cm. What is the perimeter of the rectangle

**Chemistry**

An atom it ground state contains 18 electrons. How many of these electrons are in orbitals with l=0? a.4 b.2 c.8 d.6

**Math**

How much did you invest each month at 6.60% compounded monthly if 25 years later the investment is worth 228190.50?

**language**

From a story,how do you draw a conclusion

**math**

In the square if part A is 1/4 of the square and part C is 1/10 of the square, what percent of the square is part B?

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4

**Chemistry**

The amount of energy released by burning a fuel source, measured in energy per mass, is called fuel value. If all the energy obtained from burning 1.3 pounds of butane (fuel value 10.85 kcal/g) is used to heat 122 kg of water at an initial temperature of 20.9 degC, what is the...

**General Chemistry (College LvL)**

When a 4.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 2.908 kJ x K^-1, the temperature decreases by .230 K. Calculate the molar heat of KBR

**Physics**

A 6-kg bowling ball with a radius of 14 cm is spinning about a vertical axis (with its center of mass motionless) at an initial rate of 3 turns per second. Friction with the floor, however, causes the bowling ball to rotate more and more slowly until it stops after about 22s. ...

**Physics**

Displacement vector [3, 0 , -2] and [-1,5,2]displacement vector , both measured in meters. Find the components of the cross product of these vectors.

**physics**

At a certain time, a 55-kg person is 25 m due north of you and is walking at a speed of 1.2 m/s exactly southwest. What are the magnitude and direction of this person’s angular momentum about you?

**physics**

travelling at 90km/hr except for a 30 minute rest stop. Average speed for the trip is 78km/hr. what is the total travelling time and what is the total distance travelled?? thanks

**Basic Math**

The link you posted made it clear! Thank you Thank you!

**Basic Math**

A student claims that 2/3 = 6/7 because if you add 4 to both the top and the bottom of a fraction, the fraction does not change. How do you respond? I am a bit confused. Don't you need to have a common denominator?

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