Thursday

July 2, 2015

July 2, 2015

Total # Posts: 529

**Physics**

if a toy car's motor propelled it 1.905m in 7.1 seconds and it kept rolling .38m for 8.6 seconds what is the coefficient of friction between the wheels and the floor assuming that is the only source of friction. i know accel=.08m/s2 and -.12m/s2 but after that i got lost.
*April 5, 2013*

**Physics- so confused!!**

I am not sure. I think the speeds are for the bullet before and after passing through the block. However, in the diagram the second block is in a different spot after the bullet hits it.
*March 23, 2013*

**Physics- so confused!!**

A bullet with a mass of 5.40 g is fired horizontally at two blocks resting on a smooth and frictionless table top as shown in the Figure. The bullet passes through the first 1.20 kg block, and embeds itself in a second 1.20 kg block. Speeds v1 = 3.90 m/s and v2 = 1.70 m/s, are...
*March 23, 2013*

**chemistry**

At 2273 K, Keq = 6.2 multiplied by 10-4 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) If [N2] = 0.04700 mol/L and [O2] = 0.01200 mol/L, what is the concentration of NO at equilibrium? please answer and explain this one as well.
*March 11, 2013*

**chemistry**

please help and explain. At a certain temperature, Keq = 10.5 for the equilibrium below. CO(g) + 2 H2(g) equilibrium reaction arrow CH3OH(g) Calculate the following concentrations. (b) [H2] in an equilibrium mixture containing 1.01 mol/L CO and 0.335 mol/L CH3OH
*March 11, 2013*

**Chemistry**

I was taught that hydrogen bonds are actually very weak, but it may just be a matter of different teachers. I would answer C) Covalent Bonding because they SHARE an electron keeping them very close and tight.
*March 10, 2013*

**Science**

77.15 ....YAY GOOGLE!
*March 10, 2013*

**language**

Well this totally depends on the child. My younger siblings all started around six, but this could vary.
*March 10, 2013*

**Physics**

A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N, I'm just not ...
*March 10, 2013*

**Physics**

A box is held against a wall (not resting on the ground). What minimum horizontal force will JUST prevent the 5.0kg box from sliding if the coefficient of friction betweent he wall and the box is 0.65?
*March 10, 2013*

**Biology**

A golgi body is used to package proteins and lipids into vesicles for transport, so it's probably a cell that produces proteins or lipids or both.
*March 10, 2013*

**social studies**

- languages - if their mother country went to war, would they join (eg. WWI (Canada): british immigrants wanted to join Britain, but french immigrants felt no connection to Britain and wanted to stay out of the war...) - school systems - religion ...the list goes on, I'm ...
*March 10, 2013*

**algebra I**

how do I solve for 16x^2+56x-120
*March 6, 2013*

**Algebra**

isn't it: [(26^4)+ (10^3)]-241
*March 6, 2013*

**french**

what is the weather like in Spring?
*March 2, 2013*

**German**

This IS grammatically correct, but it sounds weird (no offense :P). It means "I would rather put on make-up than he would", more or less. There would be better-sounding ways to say this although it is correct.
*March 1, 2013*

**math**

The application of one function followed by the application of a second function to the result of the first as in F^-1(f(x)) is called composition of functions. The two functions need not be inverse of each other. In a diagram, the output of one function is f(x) is used as the...
*February 10, 2013*

**physics**

The launching speed of a certain projectile is 3.0 times the speed it has at its maximum height. Calculate the elevation angle at launching
*February 8, 2013*

**Chemistry**

Thank you so much for the detailed steps. Finally understood what I need to do.
*February 7, 2013*

**Chemistry**

Calculate the value of Kp for the equation C(s)+CO2(g)<->2CO(g) Kp=? given that at a certain temperature C(s)+2H2O(g)<->CO2(g)+2H2(g) Kp1=3.33 H2(g)+CO2(g)<->H2O(g)+CO(g) Kp2=.733 Please show detailed steps.
*February 7, 2013*

**Physics please help!!**

A basketball player throws the ball at a 38° angle above the horizontal to a hoop which is located a horizontal distance L = 5.6 m from the point of release and at a height h = 0.4 m above it. What is the required speed if the basketball is to reach the hoop? Not sure how ...
*February 5, 2013*

**Physics please help!!**

A stone is aimed at a cliff of height h with an initial speed of v = 64.0 m/s directed 55.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 7.31 s after launching. What is the height of the cliff? What is the maximum height H ...
*February 5, 2013*

**Physics please help!!**

A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
*February 5, 2013*

**Physics please help!!**

The launching speed of a certain projectile is 9.0 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*February 3, 2013*

**Physics please help!!**

A projectile is fired at 45.0° above the horizontal. Its initial speed is equal to 42.5 m/s. Assume that the free-fall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile? At what time ...
*February 3, 2013*

**Physics please help!!**

A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
*February 3, 2013*

**Language**

Oh, hahah, I wasnt thinking right. I looked back over the question and I am almost possitive that is it #3.
*January 29, 2013*

**Language**

Sorry, I dont understand what you are saying, What text?
*January 29, 2013*

**Language**

What are the three main parts of a research report? 1.title, body, conclusion 2.introduction, body, sources 3.introduction, body, conclusion 4.introduction, evidence, conclusion and I just need it checked, I believe that it is #4...is that right?
*January 29, 2013*

**Physics**

You hang mass m=0.22 kg on a spring with constant 12 N/m. You pull the mass down a distance of 0.04 m from its equilibrium position and release it. You measure the period to be 0.85 s. If you instead pull the mass down 0.12 m from its equilibrium position and release it, what ...
*January 24, 2013*

**math**

a flagpole casts a shadow 10 ft. long if a man 6 ft. tall casts a shadow 4 ft. long at the same time of day, how tall is the flagpole.
*January 21, 2013*

**CHEMISTRY**

Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters
*January 12, 2013*

**chemistry**

The solubility of bismuth iodide (BiI3) in water is 9.491 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)
*January 12, 2013*

**MATH I HAVE ASKED TWICE ALREADY!!!!!!!!!**

There will be more than one answer. To have a remainder of 8, the divisor must be greater than 8. The only single digit greater than 8 is 9, so 9 must be the divisor. Since 8 is 1 less than 9, the dividend needs to be one less than a multiple of 9. Candidates are values of 3 ...
*January 6, 2013*

**English**

Scotland
*January 6, 2013*

**Math**

Um so what's the answer, 35 or 12??
*December 26, 2012*

**English - Ms. Sue help**

I just took this and it is actullly, 1.b 2.c 3.b 4.c not even kidding....Promise!
*December 19, 2012*

**Statistics**

Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?
*December 2, 2012*

**Statistics**

If a research report contains the results of an independent measures ANOVA as follows: F(3,28) = 5.36, p<.01 the study only compared two groups rather than three correct?
*December 2, 2012*

**math**

"the area of the region under the graph" is an integral of f(x) from a to b, in your case from 4 to 10. ∫ f(x) from 4 to 10=∫ (10x-5)dx from 4 to 10. you just have to compute the integral and that will give you: 1/2*10x^2-5x evaluate it from 4 to 10 I ...
*November 30, 2012*

**Math**

Do you have any information about length of the sides maybe? By the way you do have information about at least one angle and it's 90 degrees (because triangle is a right one)
*November 30, 2012*

**Math**

I posted the answer under your previous question.
*November 29, 2012*

**Math**

The formula is y-y1= m*(x-x1) 1. Find the midpoint= [(x1-x2)/2, (y1-y2)/2] you will get (-4,-2) 2. Find slope m1= [2-(-6)]/[-7-(-1)]= 8/-6=-4/3 3. find the slope of the perpendicular line m1*m2=-1 -4/3*m2= -1 m2= 3/4 4. Plug in given points (-7,2) and (-1,-6) and m2 in the ...
*November 29, 2012*

**math**

Did you provide the all information? Because all you can do with the given information is to plug P=4 into the equation and find x, but x is quantity of CD demanded. Consumer surplus is the difference between the max price a consumer willing to pay and the actual price they do...
*November 28, 2012*

**Math**

2.4*7.5+6*1=24
*November 28, 2012*

**math**

You start with 4 matches, then you add only three more to get another (attached to the fist one) square. Then each time to get one more square you add 3 more matches. Now, let x be a number of squares you can make from a given number of matches. Then 4+3*(x-1)=100. I used (x-1...
*November 28, 2012*

**math**

You should first convert 1.4t into kg. Then from that number subscribe empty trailer's mass and you will get the answer
*November 28, 2012*

**math**

Divide distance 4 1/2 by 1 1/2 you will get 3 (miles per hour). Please check exact math using the calculator but I believe it is right
*November 27, 2012*

**math pls help Ms Sue**

Sorry for misspells! Getting late!
*November 27, 2012*

**math pls help Ms Sue**

I am not sure with one, m or n, is an input and which one is output. But I believe the following rule can work: To get n: 15-3, 10-2, 5-1, 0-0 . As you can see each time the number (3,2,1,0) that you have to subscribe to get n is getting smaller by one. (if m is an input, but ...
*November 27, 2012*

**math**

I posted the answer in your latest question
*November 27, 2012*

**Math**

I think margin of error is 0.08, because if 0.5-0.08=0.42 (or 42%) and 0.5-0.08=.58 (or 58%) so 0.08 works perfectly
*November 27, 2012*

**math**

I believe first you need to add them 38+26=64, and then 10+54=64
*November 27, 2012*

**Calculus**

1/6(8+t)^6+constant
*November 27, 2012*

**7th grade math**

2A. 329.00*15%= 329.00*0.15=$49.35 this is the discount. 329 - discount = 329 -49.35=$279.65 discounted price 2B. 329*10%=329*0.1=32.9 is how much more the ipad will cost compared to the old price (increase in price). Now add it to the old price: 329 + 32.9=$361.9 is new price...
*November 27, 2012*

**7th grade math**

1A. 12.99*5%=12.99*.05=0.65 this is the sale tax 12.99 + 0.65= 13.64 is the price after tax 1B. 12.99*20%=12.99*0.2=$2.6 is discount 12.99 - discount= 12.99 - 2.6=10.39 is the price after discount was applied 10.39*5%=10.4*0.05=0.52 is the tax 10.39+.52=$10.91 is the price ...
*November 27, 2012*

**physics**

A 66.0 kg rider sitting on a 7.1 kg bike is riding along at 9.4 m/s in the positive direction. The rider drags a foot on the ground and slows down to 6.5 m/s still in the positive direction. What is the change in momentum of the rider and bike?
*November 26, 2012*

**Algebra 2**

Te arch of the Sydeny Harbor Bridge can be modeled by y= -0.00211x^2 + 1.06x where x is the distance (in meters) from the left pylons and y is the height (in meters) of the arch above the water. For what distances x is the arch above the road? (It has a picture and in it the ...
*November 24, 2012*

**counting up method**

how do you do the counting up method
*November 19, 2012*

**AP Global **

Please, help! How did Islam unite and effectively rule diverse people and cultures?
*November 18, 2012*

**English - Ms. Sue help**

I just need an answer to No. 9 on the CCA Lang. Art test: "Rewrite the first stanza of "Scott's Goodbye" ,as free verse. I don't really understand "stanza", and "free verse"?
*November 13, 2012*

**Science**

Thanks a bunch!
*November 12, 2012*

**Science**

I have been thinking of something to do for my schools science fair for weeks and my teacher keeps telling me that i can't do my idea because its too easy for an honors student. I'm all out of ideas and I need help! Please!
*November 12, 2012*

**math**

what is the reciprocal of 3 5/7
*November 10, 2012*

**English**

Logos
*November 8, 2012*

**Algebra 2**

What's the solution?
*November 7, 2012*

**Algebra 2**

D-R=1550+42t-15t=1550=27t
*November 7, 2012*

**algebra 2**

Previos: D(t)=1550+42t-15t=1550=27t (t represtentnig time) Based on the function for D, what would be the total amount of non functional components in 2014? Let 1993 be represented by 0.
*November 6, 2012*

**world history**

Constitutional Monarchy :)
*November 6, 2012*

**English HELP!!!!!**

I have to find a antonym for atmosphere. Help please!!!
*October 17, 2012*

**physics**

A frictionless30degrees incline should provide an acceleration of 4.90m/s2 down the incline. A student with a stopwatch finds that an object, starting from rest, slides down a 15m very smooth incline in exactly 3s. Is the incline frictionless?
*October 9, 2012*

**Math**

looked it up helped allot! (:c)
*October 5, 2012*

**Math**

what i don't understand
*September 17, 2012*

**computers**

Although label choices vary for different printers, your textbook recommends __________ for laser and ink jet printers. A. Avery standard, 5160, Address B. Avery standard, 6150, Label C. Avery standard, 6150, Address D. Avery standard, 5160, Label I've looked through the ...
*June 27, 2012*

**Derivatives?**

Given that f(-0.5)=2 and f'(-0.5)=4, use a tangent line approximation to estimate f(0). The lesson is not very clear on what a tangent line approximaton is.
*June 5, 2012*

**algebra **

suppose 25 bacteria settle into a cut on.your arem and begin to double.every thirty minutes. creste s table where x is the number of minutes and y is the number of bacteria
*June 5, 2012*

**Math**

I believe you would add the four months together and divide by 4 to get your average. With rounding, I got $4,850.
*May 27, 2012*

**Cost Accounting**

Budgeted material costs 1,000 Budgeted labor costs 2,000 Budgeted overhead costs 1,500 Actual material costs 900 Actual labor costs 1,800 Actual overhead costs 1,250 1/1 WIP = 0 12/31 WIP = 2 1) Materials 25 Labor 20 2) Materials 15 Labor 32 Compute the overhead allocation ...
*May 27, 2012*

**physics**

Thank you Elena! :)
*May 25, 2012*

**physics**

Adam?...Elena thanks for the answer, but it says its wrong.
*May 25, 2012*

**physics**

A highway curve has a radius of 123 m. At what angle should the road be banked so that a car traveling at 26.5 m/s has no tendency to skid sideways on the road? [Hint: No tendency to skid means the frictional force is zero.] I can't get this one right either please someone...
*May 25, 2012*

**physics**

A car drives around a curve with radius 390 m at a speed of 32 m/s. The road is not banked. The mass of the car is 1200 kg. (a) What is the frictional force on the car? N c) Explain I really don't know how to solve this could someone please help me out on this. Thank you.
*May 25, 2012*

**Math**

6/20 7/20 8/20 9/20 10/20 1/2 11/20 12/20
*May 14, 2012*

**caculus**

1+1
*May 1, 2012*

**physics**

A person walks 1 mile every day for exercise leaving her front porch at 9:00 am and returning to her porch at 9:25 am what's the total displacement of her daily walk?
*April 23, 2012*

**physics**

A person walks 1 mile every day for exercise leaving her front porch at 9:00 am and returning to her porch at 9:25 am what's the total displacement of her daily walk?
*April 23, 2012*

**math**

oooooooohhhhhh so it's bigger than before!!!
*April 19, 2012*

**math**

when a cross tile is placed on a number plane the centre number is the average of al the numbers covered. Explain why
*April 16, 2012*

**Physics**

A cylindrical 7.00-kg reel with a radius of 0.60 m and a frictionless axle, starts from rest and speeds up uniformly as a 3.00-kg bucket falls into a well, making a light rope unwind from the reel (Fig. P8.36). The bucket starts from rest and falls for 5.00s. (a) What is the ...
*April 11, 2012*

**Chemistry**

If you have 250 mL of 2 M of sodium sulfate diluted to make 0.500 M of sodium sulfate, how would you figure out the volume?
*April 10, 2012*

**Physics**

A dog, with a mass of 8.0 kg, is standing on a flatboat so that he is 26.8 m from the shore. He walks 8.6 m on the boat toward the shore and then stops. The boat has a mass of 36.0 kg. Assuming there is no friction between the boat and the water, how far is the dog from the ...
*March 27, 2012*

**physics**

Three identical uniform meter sticks are placed on the floor. The first stick lies along the y axis from y = 0.470 m to y = 1.47 m. The second stick lies along the x axis from x = 0.320 m to x = 1.32 m. The third stick is positioned so that one end is on the x axis at x = 0....
*March 26, 2012*

**Math**

how do you make this into an equation? whats the x and y intercept? She has two jobs, at her first job she makes $10 per hour, at her second job she makes $12 per hour. last week she made $440.
*March 22, 2012*

**Algebra**

how do you make this into an equation? whats the x and y intercept? She has two jobs, at her first job she makes $10 per hour, at her second job she makes $12 per hour. last week she made $440.
*March 22, 2012*

**Geometry**

The answer is 413 km.
*March 19, 2012*

**Physics**

If the scuba diver is looking from the water n=1.33 and the other man is above water so n=1, use the equation n1sin(theta)=n2sin(theta). 1.33sin(20)=1sin(theta) 27.06 degrees is the answer, but since it says from the horizontal do 90-27.06
*March 17, 2012*

**Science**

PLEASE HELP ME!!!!! Which requires more energy? Heating up a 350 mL cup of coffee from 25C to 65C? or Warming the surface of a Lake (2,000,000,000 mL) from 28C to 29C. and Prove your answer.
*March 7, 2012*

**math**

45 is the second answer to the second question.i don't know the first question
*March 6, 2012*

**physical**

Thank you for your help!!!
*February 12, 2012*