Sunday
February 14, 2016

Posts by anonymous

Total # Posts: 91,718

Physics HELP
How would I solve this problem? A plane travels 4300 m at an angle of 49 degrees to the ground, then changes direction and travels 6500 m at an angle of 21 degrees to the ground. What is the magnitude and direction of the planes tot displacement?
November 15, 2015

SOC 320
Which of the following is among the Courts’ means of influencing implementation? (Points : 1) Judicial review of administrative rules and rule making Direct oversight of executive branch agencies Routine judicial review of appropriations Intervening in policy cases they ...
November 15, 2015

Chemistry
I'm confused. Why do you use log and why do you do 1/H2SO4? I found this equation in our textbook: Ecell=Eocell-(RT/nFl)nQ When I use that equation I get 2.00, when I use the equation you've given I get 2.05. I know it's a small difference but why? Thank you
November 15, 2015

Chemistry
Given: PbSO4 + 2e− Pb + SO42− E° = -0.356 V PbO2 + 4H+ + SO42− + 2e− PbSO4 + 2H2O E° = 1.685 V Determine the cell voltage of the lead storage battery when the concentration of sulfuric acid is 4.00 M. Where do I start, thank you
November 15, 2015

physics
When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B. Detrmine the force exerted on the shelf by the ...
November 15, 2015

physics
When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B.
November 15, 2015

Maths
Statistics The marks scored by a sample of 56 students are summarised by: N=56 Sum of x =3026 sum of(x-the mean)^2 =15378 A) calculate the mean and the standard deviation Mean I got - 54.04 (2.dp) Standard deviation I got - 16.72 (2.dp) Is this correct? B) the formula y=1.2x-...
November 15, 2015

Physics HELP
A bug on a picnic table travels 10 cm east, then 18 cm northward, and finally 20 cm westward. What is the bugs displacement relative to its original position?
November 15, 2015

PLEASE I NEED HELP MS SUE
in the heart blood flows from the right atrium to the right ventricle where it is pumped to the ______ openstudy
November 15, 2015

math
An aeroplane flies due north from Ikeja Airport for 500km. It then flies on a bearing of 060 degrees for a further distance of 300km before overflying a road junction.Calculate a. The distance of the aeroplne from Ikeja Airport when it was directly above the road junction. B....
November 15, 2015

Math
What is the numerical expression for 8[(20-4)-6]
November 15, 2015

maths plz help
Painters A and B take 3 hours to paint a room Painters B and C take 5 hours to paint the same room Painters A and C take 7 hours to paint the same room How long would it take all three to paint the same room?
November 15, 2015

Physics
If the magnetic field in a traveling EM wave has a peak value of 17.9nT, what is the peak value of the electric field strength?
November 15, 2015

math
is (3,7) correct
November 15, 2015

math
solve the system by substitution -4x-5y=-47 x=2y-11
November 15, 2015

Maths
Statistics The marks scored by a sample of 56 students are summarised by: N=56 Sum of x =3026 sum of(x-the mean)^2 =15378 A) calculate the mean and the standard deviation Mean I got - 54.04 (2.dp) Standard deviation I got - 16.72 (2.dp) Is this correct? B) the formula y=1.2x-...
November 15, 2015

physics
A disk shaped yoyo (m=220 grams) has a 70 cm long string. The radius of the central winding peg is 2.5 mm, the outer radius of the yoyo is 5.6 cm. A) How much Torque is applied to this yoyo by the string? B) How long until the yoyo hits the bottom of the throw? C) What is the ...
November 15, 2015

Chemistry
10000 tonnes of iron reacted in a blast furnace Fe2O3 calculate the typical mass of iron produced each day
November 15, 2015

PHYSICS
A BALL IS PROJECTED VERTICALLY UPWARD FROM THE TOP OF A TOWER 60MITRE HIGH WITH A VELOCITY OF 30MITRE PER SECONDS.WHAT IS THE MAXIMUM HEIGHT ABOVE THE GROUND LEVEL?HOW LONG DOES IT TAKE TO REACH THE GROUND?
November 15, 2015

Physics
rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight?
November 15, 2015

Biology
simulate a 24 hour day 12 hours of light 12 hours of dark how many snails and plants do you ened to keep a stable environment
November 14, 2015

Biology
Animals breathe in ___ and breathe out __ In sunlight plants take in ___ and realease __
November 14, 2015

Biology
What gas do plants give off in the light
November 14, 2015

Biology
Why don't we run out of the important gases that we need to stay alive?
November 14, 2015

chemistry
Consider an atom traveling at 1% of the speed of light. The de Broglie wavelength is found to be 9.50 × 10–3 pm. Which element is this?
November 14, 2015

Centripetal acceleration
Is this right? Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting 1350 N on the vine, what is his acceleration at the point where the vine makes an angle of 45 degrees from the vertical assuming maximum speed at this ...
November 14, 2015

Government
To what extent do cabinet heads control the bureaucracy?
November 14, 2015

Physics
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting 1350 N on the vine, what is his acceleration at the point where the vine makes an angle of 45 degrees from the vertical assuming maximum speed at this point. His mass ...
November 14, 2015

algebra
eq 1: y miles/(6 mph + x mph)=3 hr eq 2: y miles/(6 mph - x mph)=5 r multiply both sides by the numerator on the left eq 1: y =18 + 3x eq 2: y =30 - 5x subtract equation 2 from equation 1 0=-12 + 8x 12=8x 12/8+x
November 14, 2015

algebra
Chen's motorgoat took 3 hr to make a treip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water.
November 14, 2015

PE
How does breathing change during exercise? Rate and depth decrease Rate and depth increase Rate increases and depth decreases Rate decreases and depth increases I think Rate increases and depth decreases is correct, can someone confirm or object? Danke.
November 14, 2015

Chemistry
Given the following half-reactions and their standard reduction potentials, Ni2+ + 2e− Ni E° = -0.25 V 2H+ + 2e− H2 E° = 0.00 V Ag+ + e− Ag E° = 0.80 V a spontaneous reaction will occur between: a. Ni2+ and H2 b. H+ and Ag c. Ag+ and Ni d. Ni2+ ...
November 14, 2015

Riddle
Reflection
November 14, 2015

Riddle
to all things and men I appertain and yet by some am shunned and distend. Fonder me and ogle me till your Insane ,but no blow can harm me cause me pain. Children delight in me ,elders take fright, fair maids rejoice and spin. Cry and I weep,yawn and I sleep,smile and I shall ...
November 14, 2015

Spanish
Would you use indicative or subjective in this sentence? Explain why? María prefiere que no _________________ (haber) mucha gente en la playa. (I think that you would use subjective because "haber" can count as a subjective change and it has a verb of influence)
November 14, 2015

Health
u stupid
November 14, 2015

physics
The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand
November 14, 2015

physics
A circular disk of 10cm radius is charged uniformly with a total charge of Q. Find the electric field intensity at a point 20cm away from the disk along its axis
November 14, 2015

literature
Whose account of climbing everest was more appealing to you
November 13, 2015

Math
let the 10 digit number be x let the one digit number be y x + y = 14 , y= 14 - x original number 10x + y reversed number 10y + x equation 10y +x = 10x +y +36 subsitute for y 10(14-x) + x = 10x +14 - x + 36 140 - 10x + x = 10x +14 - x + 36 x = 5 y = 14 - x y = 14 - 5 = 9 ...
November 13, 2015

Chemistry (Check)
Here is my work, I might have gotten the answers the wrong way. 6.3 mg / 1000 = .0063g 385 mL / 1000 = .385 L 25 degrees C + 273 = 298 K 11 Torr / 760 = .0145 atm .0145 atm x .385L = n (.08206 Latm/molK) 298K n = 2.28x10^-4 moles A. MM = .0063g / 2.28x10^-4mole = 27.597 g/mol ...
November 13, 2015

Chemistry (Check)
6.3 mg of a boron hydride is contained in a flask of 385 mL at 25. degrees C and a pressure of 11 Torr. A. determine the molar mass of the hydride. B. which of the following hydrides is contained in the flask, BH3, B2H6, or B4H10 A. MM = 27.597 g/mol B. B2H6
November 13, 2015

Chemistry
Density = 2.82 g/L
November 13, 2015

Chemistry
Calculate the density (g/L) of 478 mL of krypton at 47 degrees C and 671 mmHg. I wasn't sure about this one but I got: density = 2820 g/L with sig figs
November 13, 2015

Chemistry (Check)
A sample of helium has a volume of 521 cc at a pressure of 75 cmHg and a temperature of 18 degrees C. When the temperature is increased to 23 degrees C, what is the volume of the helium? Vf = .530 L
November 13, 2015

Children Development
Thanks for the help.
November 13, 2015

Children Development
At Erickson Autonomy Shame and Doubt stage how do parents hinder or promote a child development?
November 13, 2015

Chemistry (Check)
It does. Thank you so much for all your help.
November 13, 2015

Chemistry (Check)
Mine doesn't round up. What did I do wrong? 15.0 L 27 degrees C + 273 = 300K 900. mmHg / 760 mmHg = 1.18 atm 1.18 atm x 15.0 L = n (.08206 Latm / mol K) 300K n = .719 moles NH3 x (17.03056g / 1 moleNH3) = 12.2449 g NH3
November 13, 2015

Chemistry (Check)
Calculate the mass of 15.0 L of NH3 at 27 degrees C and 900 mmHg. Mass of NH3 = 12.2 g
November 13, 2015

Chemistry (Check)
A container holds 500. mL of CO2 at 20. degrees C and 742 Torr. What will be the volume of the CO2 if the pressure is increased to 795 Torr? Vf = .465 L
November 13, 2015

Chemistry
Given 300.0 mL of a gas at 17.0 degrees C. What is its volume at 10.0 degrees C? Vf = .293 L
November 13, 2015

Chemistry (Check)
A 30.0 L sample of nitrogen inside a rigid, metal container at 20.0 degrees C is placed inside an oven whose temperature is 50.0 degrees D. The pressure inside the container at 20.0 degrees C was at 3.00 atm. What is the pressure of the nitrogen after its temperature is ...
November 13, 2015

Chemistry (Check)
Yes, Liters. sorry
November 13, 2015

Chemistry (Check)
Chlorine gas, Cl2, is widely used to purify municipal water supplies and treat swimming pool waters. If it occupies 23.5 cm^3 at STP, what volume will it occupy at -270. degrees C and a pressure of 1520 Torr? Vf = 1.29 x 10^-4
November 13, 2015

Children Development
Thanks I really appreciate your help Reed. I find the person your walrusy king to be really rude toward me.
November 13, 2015

Children Development
I am sorry The question is question what was happening in your life at this stage? is Your walrusy king a tutor?
November 13, 2015

Children Development
What?
November 13, 2015

Children Development
I cannot figure of what means by what life experiences i had at trust vs.mistrust stage of life?
November 13, 2015

Chemistry (Check)
A sample of gas has a volume of 12.0 L and a pressure of 20kPa. If the pressure of gas is increased to 50 psi, what is the new volume of the gas? Vf = 6.96 L
November 13, 2015

Chemistry (Check)
Ok thanks!
November 13, 2015

Chemistry (Check)
This is my work: 985mLN / 1000 = .985 L 0.0 degrees C + 273 = 273 K 1.00x10^-6 mmHg / 760 mmHg = 1.32 atm 1.32 atm x .985 L = n ( .08206 Latm / molK)x273K n = .0580 moles x 6.022x10^23 = 3.50 x 10^23 molecules. Ok thanks
November 13, 2015

Chemistry (Check)
3.50x10^23 molecules
November 13, 2015

Chemistry (Check)
How many molecules are there in 985 mL of nitrogen at 0.0 degrees C and 1.00x10^-6 mmHg? 3.50 molecules
November 13, 2015

science plz help fast
1 at least one is helped in both cases
November 13, 2015

Chemistry (Check)
If a gas in a closed container is pressurized from 12 atm to 25 atm and tis original temperature was 32 degrees C, what would the final temperature of the gas be? Tf = 635 K
November 13, 2015

English
I can read it but only if someone is reading it out loud with me it helps me focuse on the story better and I can do better on my schoolwork. Thanks to both of you :)
November 13, 2015

English
I need either an audio for the book "Nethergrave" by Gloria Skurzynski or an extremely detailed summary please.
November 13, 2015

Math
25
November 13, 2015

Math
Can someone check my answers when a skydiver jumps from an airplane, the distance d in feet the diver falls in t seconds before opening the parachute is given by the formula d=16t2. the formula assumes that there is no air resistance. find the time it takes a skydiver to fall ...
November 13, 2015

Calculus 1
Reiny, Aren't we supposed to use distance formula for this though?
November 13, 2015

social studies PLEASE HELP
can someone actually help me??? (mrs sue)
November 13, 2015

social studies PLEASE HELP
which of the following is true of social classes? people in most societies cannot improve their status they are based mainly on age people can improve their status by getting a good education they are based mainly on gender im not sure what to even guess please help me
November 13, 2015

history
idk
November 13, 2015

Math
Need to find out how many answers I got correct out of 40 questions. I ended with a zero at the end .5 points were given fr the correct answer while 3oints were deducted or the wrong answer
November 13, 2015

Chemistry
Show that the reaction caco3 ->cao+co2 is not a redox reaction
November 13, 2015

Chemistry
Carbon disulfide (CS2) is useful, but flammable, solvent. Calculate DH for the following reaction. CS2(l) + 3O2(g) --> CO2(g) + 2SO2(g)
November 13, 2015

social
Gold
November 13, 2015

Math
Can someone check my answers when a skydiver jumps from an airplane, the distance d in feet the diver falls in t seconds before opening the parachute is given by the formula d=16t2. the formula assumes that there is no air resistance. find the time it takes a skydiver to fall ...
November 12, 2015

math
A chalk line is placed around the perimeter of the football field. What is the length in feet?
November 12, 2015

Chemistry
Use the following data 2C(s) + 4H2(g) --> C3H8(g) DH= -103.85 kJ/molrxn C(s) + O2(g) --> CO2(g) DH= -393.51 kJ/molrxn H2(g) + 1/2O2(g) --> H2O(g) DH= -241.82 kJ/molrxn to calculate the heat of combustion of propane, C3H8 C3H8(g) + 5O2(g) --3CO2(g) + 4H20(g)
November 12, 2015

Math
6 and 7, yes
November 12, 2015

Math
Check my answer? As estimate for square root 47 is between _____________ 1: 4 and 5 2: 5 and 6 3: 6 and 7 4: 7 and 8 Is the answer 6 and 7?
November 12, 2015

Chemistry
Predict the Order of increasing bond length for (i) H2(g) (ii) I2(g) (iii) F2(g) I don't know how I should know
November 12, 2015

Apology
I don't know how this got copied three times. Sorry
November 12, 2015

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
November 12, 2015

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
November 12, 2015

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
November 12, 2015

Chemistry (Check)
In a calorimeter experiment done at constant pressure in which all the heat from a chemical reaction was absorbed by the surrounding water bath, the temperature of the water went up by 2.31 K. If the size of the water bath was 200 g, what was the amount of heat transferred to ...
November 12, 2015

Chemistry Lab Work Help!
We used a buret today, and I don't get how to calculate volume. I have an initial reading of 49.97 and a final buret reading of 30.49. How do I get the volume? I thought I just subtracted the final from the initial, but someone said their tutor told them to take 50-their ...
November 12, 2015

Chemistry
The reaction between hydrogen and oxygen to produce water gives off heat. What is the source of this heat? how could this heat be measure?
November 12, 2015

Social Studies
Why do you think Marie Antoinette's spending and lavish lifestyle angered the French?
November 12, 2015

Lang. Arts
Please.
November 12, 2015

Lang. Arts
Can you give me another sentence?
November 12, 2015

Lang. Arts
What is a sentence that uses Autograph?
November 12, 2015

Math
A 12 pack of cinnamon scented pencils sells for 3.00 at a school booster club sale. What is the sales tax rate if the total cost of the pencils is 3.21?
November 12, 2015

Energy science
The deepest well from which water can be pumped, by creating a vacuum on the top end of the pipe, is 10 m (34 ft). In drilling for oil, wells of a mile or more in depth have to be made. From this depth, how do you think the oil is recovered? .
November 12, 2015

Geography
Did the US send them to refugee camps?
November 12, 2015

Geography
None.
November 12, 2015

Geography
What is an alternative strategy the Haitian people could have done at Guantanamo bay instead of coming in as refugees
November 12, 2015

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