Wednesday
December 7, 2016

Posts by James

Total # Posts: 2,392

Physics
Oh, sorry I forgot to post the rest of the question. (a) How far has she run after 64.7 s? (b) What is the velocity of the runner at this point?
May 18, 2012

Physics
A runner of mass 51.5 kg starts from rest and accelerates with a constant acceleration of 1.35 m/s2 until she reaches a velocity of 5.7 m/s. She then continues running with this constant velocity. (Take the direction the runner is going to be the positive direction. Indicate ...
May 18, 2012

Physics
A bullet is fired through a board 12.1 cm thick, with a line of motion perpendicular to the face of the board. If the bullet enters with a speed of 375 m/s and emerges with a speed of 205 m/s, what is its acceleration as it passes through the board? (Take the direction the ...
May 18, 2012

algebra
(a + 8) x (a +2) To check this, you can use FOIL (a + 8) x (a +2) (a x a)+(8a) +(2a) + (8 x 2) a^2 + (8 + 2)a + 16 a^2 + 10a + 16
May 18, 2012

math
In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?
May 10, 2012

Chemistry
Complete and balance the chemical equation. Be sure to include the states of the reactants and products. SO2(g)+O2(g) → thanks
May 4, 2012

intro to chemistry (college)
A 64.8 g mixture of the compounds potassium sulfide and calcium oxide is 17.1 % by mass potassium sulfide. The compound calcium oxide is 71.5 % by mass calcium. Calculate the mass (g) of oxygen in the mixture. mass % = mass part/mass whole x 100. I attempted the problem by ...
May 3, 2012

Chem
Dissolving 3g of ascorbic acid in 50g of acetic acid lowers the freezing point of acetic acid by 1.33degreesC. What is the molecular mass of ascorbic acid?
May 2, 2012

math
128fl oz in a gallon
May 1, 2012

english
This summer my best friend and I will be going to a theme park. I always enjoy myself when I am with my friend so I am sure that the trip will be fun. I have yet to go to this theme park, and according to one of my classmates it holds the worlds highest coaster. I cant wait ...
May 1, 2012

Physics (Spring force constant)
Please help me i cant figure out what goes in the blanks and this is the last question of my gizmo... THANKS! If the spring constant is 100 N/m, the period is equal to the _____________ _____________ of the mass multiplied by _____________. If the mass is held constant at 1.0 ...
May 1, 2012

Calculus
you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
April 30, 2012

Calculus
you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
April 30, 2012

science
how is the Maunder minimum and the little ice age related events?
April 30, 2012

chemistry
1.0 M aqueous solutions of AgNO3 , Cu(NO3 )2 and Au(NO3 ) 3 are electrolyzed in the apparatus shown, so the same amount of electricity passes through each solution. If 0.10 moles of solid Cu are formed how many moles of Ag and Au are formed?
April 27, 2012

math
What's the length of the arc ab and the area of the sector aob
April 27, 2012

math
Find the terms. Leave coefficients as factorials term with t^5 in (v-t)^17 term with x^10 in (x+y)^19
April 26, 2012

math
the conversion for .1959 cm = m
April 26, 2012

CHEMISTRY
What is the [H+] in a 0.10 M solution of ascorbic acid,C6H8O6?
April 25, 2012

Physics
A ball is thrown from a building standing 30m high, landing 10m away from the building 3.2 seconds after it was thrown. Find the angle above the horizontal and the initial velocity of the ball
April 25, 2012

math
If 3feet*50metre is Rs.8720,how much would 2feet*40metre cost?
April 24, 2012

math
How much money should be invested today in order to have \$100,000 in an account after 40 years if the rate is 6.8% compounded quarterly?
April 23, 2012

algebra 2
Jennifer invested \$2,500 in an account earning 3.5% interest compounded continuosly. How much money will she have in the account after 15 years?
April 23, 2012

math
A ramp that is 4 ft., 3 ft.at one end. I want a 30% slope to the ground; how long should the ramp be?
April 23, 2012

pre-calc help
cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)
April 21, 2012

lOTS OF PHYSICS :)
41. Is the speed of light constant as it passes through transparent materials? Yes, the speed of is always constant No, light travels at different speeds through different materials 42. A lens that causes light to diverge is A converging lens A diverging lens Fish-eye lens 43...
April 18, 2012

pHYSICS hELP rATIONAL SPEEDS OF DISKS
If rotational speed of a disc remains constant, what happens to the speed of a point on the disc if its distance from the axis is doubled? It stays the same It also doubles It triples It quadruples
April 18, 2012

physics
A projectile is launched at an angle of 600. What other angle would give the same range for the projectile if we neglect air resistance?
April 18, 2012

Physics
A ferryboat traveling at a speed of 30 km/h attempts to cross a river with a current of 5 km/h. What is the boat's speed relative to the shore? 8 km/h 25 km/h 30.4 km/h 32.8 km/h
April 18, 2012

anatomy and physiology
what lifestyle factors of the muscle affect the growth, development, size and/or healing (positively or negatively) of the tissue?
April 16, 2012

anatomy and physiololgy
what lifestyle factors of the bone affect the growth, development, size and/or healing (positively or negatively) of the tissue.
April 16, 2012

science
A 1.4 kg ball and a 3.0 kg ball are connected by a 1.0 m long rigid, massless rod. The rod is rotating cw about its center of mass at 24 rpm. What torque will bring the balls to a halt in 4.2 s?
April 15, 2012

English (Comma Question)
I think the first sentence is correct.
April 12, 2012

English (Comma Question)
Which of the following sentences is correct? "James arrives and, after a period of confusion, Mary's secret is revealed." "James arrives, and after a period of confusion, Mary's secret is revealed." "James arrives and after a period of ...
April 12, 2012

A truck rental company charges \$20 plus 9 cents per mile.Joe's friend offers to rent Joe his truck for \$35 and won't charge him mileage. What is the minimum number of miles Joe has to drive to save money using his friend's truck? 17?, 55?, 121? or 167?
April 12, 2012

Finance
A grocery store manager must decide whether to buy four rug cleaners to rent to customers. The manager estimates that the first would yield \$200 a year, the second \$150, the third \$75, and the fourth \$20. If the interest rate is 12 percent and each rug cleaner costs \$500, how ...
April 12, 2012

geometry
easy simply 286x2= whatever than do 63x4= whatever your thanks ( come from canada just joking ) your welcome :-)
April 11, 2012

chemistry
What would the final freezing point of water be if 3 mol of sugar were added to 1 kg of water (Kf = 1.86C/(mol/kg) for water and i = 1 for sugar)?
April 11, 2012

physics
The system in the Figure is in equilibrium. A mass M1 = 242.0 kg hangs from the end of a uniform strut which is held at an angle theta = 41.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 27.0o with respect to the horizontal. The strut has...
April 10, 2012

physics
The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.00 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in the figure (which is not to scale) are: D1 = 9.0 cm, D2 = 8.0 cm, and D3 = 6.5 cm. The ...
April 10, 2012

math
Jane needs to fill her pool with water. Ace said it will take them 40 minutes to fill the pool. Ben said it will take them 60 minutes to fill the pool. How long it will take for both Ace and Ben to fill the pool at the same time?
April 6, 2012

chemistry
16.67ml
March 28, 2012

Math
Based on the data, of 40% Reading and 25% Math, Out of 240 students, how many would choose reading or math as their favorite subject?
March 27, 2012

Chemistry
The Energy from glucose is obtained from the oxidation reaction C6H12O6 + 6O2 --> 6CO2 + 6H2O How would a similar reaction look for Sucrose? I am trying to find an equation about how the body uses a compound, in this case sucrose. I'm just not sure how different that ...
March 22, 2012

Physics
0.17meter
March 20, 2012

math
If (x – 3) divides evenly into x3 – x2 – kx + k, find k. (2 marks)
March 20, 2012

math
Complete the square to find the vertex of each quadratic function. State the vertex. (10 marks) A) f(x) = x2 + 8x – 3 B) f(x) = x2 – 5x + 8 C) f(x) = 2x2 – 12x + 1 D) f(x) = 3x2 + 2x – 5
March 20, 2012

math
Determine the remainder of the following polynomial divisions: (2 marks) A) (4x4 + 3x2 - x + 3) ÷ (x + 1) B) (3x2 + 2x - 7) ÷ (2x - 1)
March 20, 2012

math
Solve for x in the following equations. (4 marks) log3(x - 5) + log3(x + 3) = 2 <--- both log3.. 3 is subscript log7x + log7(x - 1) = log72x <--- all log7.. 7 is subscript.
March 19, 2012

math
log(27) / log(1/3) log(3^3) / log(3^-1) 3 log(3)/-1 log(3) -3
March 19, 2012

math
a) Log2(x^2 – 9/x^3)^3 <----- log2 2 is subscript. b)loga 5a^4 <---- loga a is subscript.
March 19, 2012

math
On the outside of what kind of triangle? right triangle or what? If you copy and paste the picture it might help or go more in depth with details please. Is that the entire question? Help me help you hahaha
March 15, 2012

math
I want to help but i feel as though i don't have all the info i need. Are angle 1 and 3 perpenticular or suppose to be similar or on the inside of a triangle?
March 15, 2012

math
Is this about a triangle or what?
March 15, 2012

Chemistry (buffers)
Say, for example, that you had prepared a Buffer C, in which you mixed 8.203 g of sodium acetate, NaC2H3O2, with 100.0 mL of 1.0 M acetic acid. a. What would be the initial pH of Buffer C? HOW???????
March 15, 2012

math
Write the expression as a logarithm of a single quantity. (4marks) A)3log5a + 4log5b - 2log5c B)3log2 -1/3log(x^2-1)
March 15, 2012

math
Find the value of each of the following. Leave your answers as fractions where appropriate. Do not change bases. a) log4 (1/8) B)10^(-10log3)<---superscript in brackets c.2log3<-----subscript.9 d.log3<---subscript.3^2x
March 15, 2012

maths
In slope intercept form as you increase one value of S, T increases by two so the formula can be T=2S+5
March 15, 2012

math
The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8 State the domain and range of this function. (1 mark) ...
March 13, 2012

March 12, 2012

math
The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8 Write this equation in function notation. (1 mark) State...
March 12, 2012

Calculus; Limits
The percentage of research articles in a prominent journal written by researchers in the United States can be modeled by A(t) = 26 + (36/1 + 0.8(0.8)^−t'), where t is time in years (t = 0 represents 1983). Numerically estimate lim as t→+infinity A(t). I ...
March 11, 2012

Math
This problem pertains to Cuisenaire Rods: 1-white 2-red 3-green 4-purple 5-yellow 6-dark green 7-black 8-brown 9-blue 10-orange Question: (a) If an all-brown train is equal in length to an all-orange train, what can be said about the number of brown rods compared to the number...
March 10, 2012

Networking
I wanted to know if the MAC address is needed to be changed and does the ip address need to change if I move my computer from my home and into my office at work which are not on the same network?
March 9, 2012

Chemistry
I'm not sure what it's asking. I know I need to write out the aqueous parts and write the charges, but I don't how to do that. Mostly I need help getting it to the Gross Equation.
March 8, 2012

Chemistry
Write the Gross and Net Ionic Equations for the following Reactions: LiNO3(aq)+(NH4)3N(aq) => Li3N(s)+ NH4NO3(aq) Al(s)+CuCl2(aq) => AlCl3(aq)+Cu(s)
March 8, 2012

Physis
A bullet of mass of 30g and travelling at a speed of 200msˉ¹ embeds itself in a wooden block. The bullet penetrates a distance of 12cm into the wood. Using the concepts of work done by a force and kinetic energy, determine the average resistive force acting on the ...
March 8, 2012

they changed the answers on penn foster
March 7, 2012

how do you write a fraction as a decimal?
March 6, 2012

i got it now thanks. its 55/100 12/100 60/100 5/10 75/100
March 6, 2012

.25 .75 .3 .5 .40 .60 .08 .12 .55 those are the ones I need help on
March 6, 2012

i still don't geit
March 6, 2012

how do you write a fraction for a decimal?
March 6, 2012

science
A 5kg object is resting on top of a 30m building. How much energy does the object have?
March 5, 2012

Chemistry
I can't figure out a clear way to write out the formatting of the question, but here is a picture. Any help is greatly appreciated. the image is on the website imggur and then then after imgur dot com its /Cus8o
March 1, 2012

Chemistry
The following reaction exhibits the rate law: Rate = k[NO2]^2[Cl2]. 2NO(g)+Cl2(g)---->2NOCl (g) (a) Explain why the following mechanism is not plausible for this reaction. Fast: NO + Cl2<-->NOCl + Cl Slow: NO + Cl---->NOCl (b) Propose a two-step mechanism involving...
March 1, 2012

Microbiology
What if you found gas in the Lab tubes but none in the BGLB thow does this affect the EC test
February 29, 2012

math
a textbook has 50 more than two times the number of pages as a workbook. combined, they have 230 pages. how many pages are in the textbook?
February 29, 2012

geometry
a ladder is placed against the side of a building at an angle of 50 degree. the ladder's base is 10ft away from the base of the building. How long is the ladder?
February 28, 2012

Physics
A spring is mounted horizontally. A crate which has a mass of 8.5kg is pressed against the spring with a force of 350N. As a result the spring is compressed a distance of 82.0cm. The mass is then released and is allowed to slide along the horizontal, frictionless surface. What...
February 26, 2012

math
Gemma is making necklaces. She needs 10 beads for each one. She has 64 beads altogether. how many necklaces can she make?
February 26, 2012

physics work and energy
A mass of 45kg is sitting at the bottom of an incline plane which is 5.5m long has a coefficient of friction of .65 and which meets the horizontal at an angle of 32deg. A force of 812N is applied to the mass so as to accelerate the mass up the inclined plane. What will be the ...
February 25, 2012

THERMOCHEMISTRY
An ice hotel that is made of 410 metric tons of ice and 12200 metric tons of snow is being melted. The company is going to siphon the melted water into nearby streams. The company is using large industrial sized acethylene to do the job. Your job is to order the rigth amount ...
February 21, 2012

calculus
A 33 by 33 square piece of cardboard is to be made into a box by cutting out equal square corners from each side of the square. What size corners should be cut out so that the volume of the box is maximized?
February 20, 2012

Chemistry
Ok thank-you anyway. I appreciate it.
February 18, 2012

Chemistry
Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in ...
February 18, 2012

Chemistry
Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in ...
February 17, 2012

Chemistry
Acetic acid is a polar molecule and can form hydrogen bonds with water molecules. Therefore, it has high solubility in water. Yet acetic acid is also soluble in benzene (C6H6), a nonpolar solvent that lacks the ability to form hydrogen bonds. A solution of 3.8g of CH3COOH in ...
February 17, 2012

Chemistry
Hydrogen gas dissolves in palladium with the hydrogen molecules going into the spaces between the metal ions. Determine the molarity, molality, and percent by mass of the H2:Pd solution (d=10.8g/cm)containing 0.94g hydrogen gas dissolved in 215 grams of palladium metal.
February 17, 2012

Chemistry
THANK YOU!
February 17, 2012

Chemistry
I am lost about where to start on this. "The idea comes to mind to put some hot rocks in your frozen bath water. What mass of rocks at 220 degrees Celsius needs to be added to 500.0L of frozen bath water at 0 degrees celsius to raise its temperature to 55 degrees celsius...
February 17, 2012

math
The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8
February 15, 2012

math
A student was given the function f(x) = x2 and asked to write the result of translating this function 1 unit to the left. The student wrote the following: g(x) = (x+1)2. Is this statement correct? Explain.
February 15, 2012

math
my x and y are in ml not liters..
February 15, 2012

math
??I got this when I followed steve's steps... optimal solution: c=191/23; x=2750/23; y=3000/23; z=0
February 15, 2012

AP English Literature
Thank you so much. I really appreciate it.
February 13, 2012

AP English Literature
E) synecdoche is that the correct answer?
February 13, 2012

AP English Literature
Can someone please help me? In Jane Eyre in chapter 1 with the quote, "every nerve I had feared him; and every morsel of flesh on my bones shrank when he came near," all the literary devices illustrate all of the following EXCEPT A) parallelism, B) hyperbole C) ...
February 13, 2012