Wednesday

September 2, 2015
Total # Posts: 3,051

**physics**

A toboggan approaches a snowy hill moving at 15.0 m/s. The coefficients of static and kinetic friction between the snow and the toboggan are 0.460 and 0.350, respectively, and the hill slopes upward at 41.0 above the horizontal. Find the acceleration of the toboggan as it is ...
*February 8, 2013*

**Social studies ASAP**

Which of the following helped to increase the populations of northeastern cities more diversity successful cotton crops growth of factories and trade building of the Erie Canal i chose building of the erie canal
*February 8, 2013*

**science**

1. When you hold a piece of chocolate in your hand, why does the chocolate melt? 2. Which is a larger unit of heat: calorie, kilocalorie, Btu, or joule?
*February 7, 2013*

**math probability**

If I had the many black grey and white socks and i pulled out 2 socks that did not match. How many more socks do i have to take out of my drawer to be certain to have a matching pair
*February 6, 2013*

**maths**

Using properties of the triple scalar product and triple vector product, prove that (a ^ b) (c ^ d) = (a *c)(b * d) - (a * d)(b * c): [Hint: start by thinking of (a ^ b) (c ^ d) as (a ^ b) e, where e = c ^ d]
*February 6, 2013*

**math**

Find the percent of decrease. Original rent: $600 New rent: $450
*February 6, 2013*

**history**

who was the united states able to win the war in the pacific?
*February 5, 2013*

**history**

who was commander of the u.s. troops on bataan?
*February 5, 2013*

**Physics**

The radio station WBRU broadcasts in the radio spectrum at 95.5 MHz. What is the wavelength of this electromagnetic wave in meters?
*February 4, 2013*

**Math**

Please help with the following questions: 1. write 12 million in scientific notation 2. Write 17,600 in scientific notation 3. write 1.2 * 10 to the fourth power in standard form 4. write 5 * 10 to the sixth power in standard form
*February 4, 2013*

**history**

thanks
*February 2, 2013*

**history**

what was necessary for the united states to be able to increase its production of war materials in a short period of time?
*February 2, 2013*

**Geography**

What is the name of the salt lake located on the border between Israel and Jordan? I think the answer is the Dead Sea, is that right?
*January 30, 2013*

**science**

Would you expect a substance to be a solid, liquid, or gas at absolute zero? Explain your answer.
*January 29, 2013*

**math ALGEBRA 1 PLEASE HELP!**

You have $2.75 in dimes and quarters, and you have a total of 17 dimes and quarters. How many of each type of coin do you have?
*January 28, 2013*

**Algebra**

how to flowchart and backtrack 10 = 0.25x - 0.25
*January 23, 2013*

**5th Grade Math**

Glenda bought z containers of laundry detergent at $9 each. She gave the cashier $50. a. Find the change Glenda received in terms of z. b. If z = 3, how much change did Glenda receive?
*January 22, 2013*

**5th grade Language Arts**

I missed these questions on homework about adjectives. Can you double check my corrections? Directions: 1. tell what is the adjective 2. what noun or pronoun it's describing Sentences: 1. Rhode Island is a small state. My orig ans: 1. small, 2. Rhode Island Correction: 1. ...
*January 20, 2013*

**geography**

when did the seat of Japanese Emperors moved from Kyoto to Edo
*January 19, 2013*

**math ALGEBRA 1 PLEASE HELP!**

You and two friends scored all 7 runs for your team in a baseball game. Jeff scored twice as many runs as you, and Mary scored twice as many runs as Jeff. How many runs did Jeff score?
*January 19, 2013*

**Math**

A rectangular field will be fenced on all four sides. Fencing for the north and south sides costs $5 per foot and fencing for the other two sides costs $9 per foot. What is the maximum area that can be enclosed for $6000?
*January 19, 2013*

**Geography**

Which state capital is east of the 90 degree W longitude line: Jackson, Indianapolis, or St Paul. I think that Indianapolis is the answer is that correct? Also, Is this correct? The Pacific Ocean is East of Asia, East of Australia, West of North America and West of South ...
*January 18, 2013*

**math**

Alex has 1/2 pizza left in the fridge. At breakfast he ate 1/3 of it. What fraction of the original pizza does he have left?
*January 18, 2013*

**Chemistry**

Write the half-reactions for F3+ + I- ---> F2+ + I2 and balance it.
*January 17, 2013*

**Trigonometry**

a. Write a formula for Q as a function of t. b. What is the value of Q when t=10 1. Initial amount 2000; increasing by 5% per year 2. Initial amount 112.8; decreasing by 23.4% per year 3. Initial amount 5; increasing by 100% per year
*January 15, 2013*

**5th grade Language Arts**

I have a couple of phrases/sentences that need to be labeled as a type of figurative language. 1. Pitter Patter, raindrops are falling from the sky. (could this be onomatopoeia or personification?) 2. Boil the butter and bring it by the bank. (could this be an idiom or ...
*January 14, 2013*

**Physics**

a stone thrown from ground level returns to the same level of projection 4s after. with what speed was the stone thrown? Take g=10 m/s2
*January 14, 2013*

**math**

the sum of the reciprocals of 3 consecutive positive integers is 47 divided by the product of the integers. what is the smallest of the 3 integers
*January 14, 2013*

**math**

the sum of the reciprocals of 3 consecutive positive integers is egual to 47 divided by the product of the integers. what is the smallest of the 3 integers
*January 14, 2013*

**Physics **

Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2 towards an object that is 9.4 x1010 m away. a) What ...
*January 11, 2013*

**Physics**

The International Space Station is 370 km above the Earth's surface (Re = 6378 km, Me = 5.98 x 10^24 kg). What is the linear velocity of the space station in m/s
*January 11, 2013*

**chemistry**

The solubility of strontium oxide, SrO, in water is 22.8 g per 100 mL at 100 °C and 0.69 g per 100 mL at 30 °C. Is the dissolving of strontium oxide in water an endothermic or exothermic process?
*January 10, 2013*

**math PLEASE HELP IM STUCK!!!**

Admissions to a concert cost $45. A vendor sells t-shirts for $12 each. What is the maximum number of t-shirts you can buy?
*January 10, 2013*

**math**

admissions to a concerto cost $45. A vendor sells t-shirts for $12. You have $90. What is the maximum number of t-shirts you can buy?
*January 10, 2013*

**science**

how much potential energy did the object have before it fell?
*January 9, 2013*

**science**

a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?
*January 9, 2013*

**science**

a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?
*January 9, 2013*

**physical science**

push a box across a table with a force of 5 newtons and the box moves 0.5 meter. how much work has been accomplished?
*January 9, 2013*

**math**

I was confused somewhat more difficult
*January 8, 2013*

**math**

solve each system by elimination x+y=10 x-y=2
*January 8, 2013*

**math**

1. y=xt1 2x+y=7 2. x=y-2 3x-y=6 3. y=2xt3 5x-y=-3
*January 8, 2013*

**algebra**

solve each system by substitution 1. 6x-3y=-33 2xty=-1 2. 2x-y=7 3x-2y=10 3. 4x=8y 2x+5y=27
*January 8, 2013*

**physical science**

Mike jogs east at a rate of 4 mph. The wind is blowing west at 1 mph. What is Mike's velocity?
*January 8, 2013*

**algebra**

supose you bought eight oranges and one grapefruit for a total of $4.60. later day, you bought six oranges and three grapefruits for a total of $4.80. what is the price of each type of fruit?
*January 8, 2013*

**algebra 2**

please help me
*January 8, 2013*

**Algebra 2**

Write a polynomial function in standard form with the given zeros: x=2,-2,4
*January 7, 2013*

**Physis**

a 2kg mass is hung from a tree and is released. Using the nodes on the graph, sketch the general shape of the vertical position of the mass versus time
*January 4, 2013*

**grammar**

1is correct
*January 3, 2013*

**Physics**

A coin is placed on an old record turntable which rotates at 78 rpm. The coefficient of friction between the record and the coin is 0.17. a) What is the angular speed of record in radians/s? b) At what distance (m) from the center will the coin begin to slide off the record? c...
*January 3, 2013*

**Physics**

Thanks
*January 3, 2013*

**Physics **

A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .
*January 3, 2013*

**Physics**

A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
*January 3, 2013*

**Physics**

I was not taught how to do this
*January 3, 2013*

**Physics**

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
*January 3, 2013*

**Physics**

On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg (6.42E23 kg). b) ...
*January 3, 2013*

**5th grade math (word problems)**

pennies! Thanks Ms. Sue
*January 3, 2013*

**5th grade math (word problems)**

I'm not sure how to solve the following problem: If you divide 1/10 of a dollar into parts that are each 1/100 of a dollar, how many parts are there? What are they called? To solve, would part of the answer be that i would have 10 parts of 1/100 (because I divide 100 by 10...
*January 3, 2013*

**Math**

P=2l+2w P-2l=2w (p-2l)/2=w
*January 3, 2013*

**Physics **

A coin is placed on an old record turntable which rotates at 78 rpm. The coefficient of friction between the record and the coin is 0.17. a) What is the angular speed of record in radians/s? b) At what distance (m) from the center will the coin begin to slide off the record? c...
*January 3, 2013*

**Physics**

Thanks
*January 3, 2013*

**Physics **

A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tension in the string?
*January 3, 2013*

**Physics **

A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .
*January 3, 2013*

**Physics **

A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
*January 3, 2013*

**Physics**

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
*January 3, 2013*

**Physics **

On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg (6.42E23 kg). b) ...
*January 3, 2013*

**Algebra**

Are you in Algebra 2?
*January 2, 2013*

**Art**

How can lines in a painting lead your eyes
*January 1, 2013*

**Math problem solving investigation: guess and chec**

The area of each square is twice the area of the next smaller square drawn in it. If the area of the smallest square is 3 square centimeters, what is the area of the largest square
*December 29, 2012*

**english **

Which of the following sentences is correctly punctuated A. The sea calmed; but no boats, left shore. B. The sea, calmed, but no boats, left shore. C. The sea calmed, but no boats left shore. D. The sea calmed but no boats left shore.
*December 22, 2012*

**Physics**

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
*December 20, 2012*

**Physics **

How many times further from the Sun than the Earth is an asteroid with an average orbital period of 7.43 years? (HINT: Let the distance to the Earth be R=1 AU)
*December 20, 2012*

**Physics**

Use Kepler's Laws and data about the Moon to determine the orbital period (hours) of a satellite that is 17512 km above the SURFACE of the Earth. HINT: How does the radius of the Earth affect the problem?
*December 20, 2012*

**Physics**

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
*December 20, 2012*

**Physics**

Thanks SOOO much
*December 20, 2012*

**Physics**

The gravitational force between two asteroids 1200 km apart is 8400 N. Find the following changes in gravity (do not write units) a) What is the force between them if the distance is 600 km?
*December 20, 2012*

**physical science **

1-Patty climbs a tree. While sitting on a branch, she drops a leaf and an acorn at the same time. What would happen?
*December 18, 2012*

**history**

World War I
*December 18, 2012*

**history**

the war's impact
*December 18, 2012*

**history**

the war's impact united states
*December 18, 2012*

**history**

what increased the cost of living after the war?
*December 18, 2012*

**calculus**

Determine the largest rectangle that can be inscribed inside the cavities of the two curves: y = –2(x – 6)2 & y = 6x2 –12*Tx – 128 + 6*T2
*December 16, 2012*

**calculus**

A 6 m3 box with a perfect triangle base and lid and 3 rectangular walls is to be constructed from 2 materials. The cost to make the base 1$/ft2 and that for the lid and walls is 4/2 $/ft2. What dimensions will result in the most cost-effective construction?
*December 16, 2012*

**Biology**

Eukaryotic chromatin can be chemically modified in several ways. List at least three modifications and describe the effect of these modifications.
*December 15, 2012*

**Biology**

If you were to examine the mature mRNA that comes from a certain human gene, and then line it up to the actual DNA sequence of that same gene, you would see many differences. What would these differences be and where do they come from?
*December 15, 2012*

**Physics**

A 59-kg person on skis starts from rest down a hill sloped at 36° from the horizontal. The coefficient of friction between the skis and the snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the ...
*December 15, 2012*

**physical science**

A 3000-kg car bumps into a stationary, 5000-kg truck. The velocity of the car before the collision was +4 m/s and -1 m/s after the collision. What is the velocity of the truck after the collision?
*December 15, 2012*

**physics**

Why might it be hard for the firefighter to hold the hose steady when the water gushes out of the hose? Think about the law of conservation of momentum.
*December 15, 2012*

**math**

if a tree in a 1/2 inch scale drawing is 11 inches tall, how tall is the actual tree?
*December 15, 2012*

**Chemistry**

babol, for diffraction we need a wave, and according to de Broglie (and later experiments) any matter behave like a waves with different lengths ( depends on their energy). So actually we make a diffraction of electrons (as a waves) on a Mo surface.
*December 14, 2012*

**Chemistry**

ok, b) eV=E To get electrons behave like a waves with the same lenght as 0.561A, we need to give them some impulse p according to de Broglie eq. and E = p^2/2m..
*December 14, 2012*

**Chemistry**

and b) is a voltage, needed to accelerate electrons to get the same.. :)
*December 14, 2012*

**EPCC**

how to calculate the heat (kJ) released to thesurroundings when a 23.0 g of HCL if formed, from a CH4 + Cl2=CHCl3+3HCL
*December 13, 2012*

**5th grade math (word problems)**

Could you explain why you divided 25 by 3/5?
*December 12, 2012*

**5th grade math (word problems)**

I didn't see an answer from yesterday, so resending. Also, is there a website to explain how to solve word problems - like key phrases to look for (ex: 'in all' - add; 'what's left' - subtraction)? Here's question from yesterday: sorry,but I don'...
*December 12, 2012*

**Chemistry - solubility, not "Methode Champenoise"**

Is CO2 soluble in ethanol? I know that CO2 is nonpolar, so that means it's soluble in nonpolar solvents, but CO2 is soluble in H2O. H2O is polar. Also, if CO2 were obeying Henry's Law, would it be soluble in ethanol at a high pressure?
*December 11, 2012*

**chemistry**

In the "Methode Champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. The reaction is given below. C6H12O6(aq)--> 2 C2H5OH(aq) + 2 CO2(g) Fermentation of 746 mL grape juice (density = 1.0 g/cm3) is allowed to take place in a bottle ...
*December 11, 2012*

**5th grade math (word problems)**

sorry,but I don't understand word problems - like what formula/expression to use. Here's the 1st problem: Rob practiced 3/5 of his music in 25minutes. About how long does it take to practice all of his music? I know that Rob has 2/5 left of music to practice. So, do I ...
*December 11, 2012*

**Chemistry**

In the "Methode Champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. The reaction is given below. C6H12O6(aq)--> 2 C2H5OH(aq) + 2 CO2(g) Fermentation of 746 mL grape juice (density = 1.0 g/cm3) is allowed to take place in a bottle ...
*December 11, 2012*

**math**

Thank you very much. This problem was giving me too much stress.
*December 10, 2012*

**math**

Find the value of the function y=sqrt(x+1)+sin(x)-0.5, correct to 3 decimal places, when x=0.05 without the use of a calculator.
*December 10, 2012*