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October 1, 2014

Posts by Justin


Total # Posts: 761

History
homo sapiens came to north america by...????
August 24, 2011

physics
. A water heater can has a power of 350 W. It is placed in a container filled with 1 litres of water with a temperature of 40 ºC. The heater is then allow to run for 1 hour. How much water will there be left in the container after 1 hour? (Specific heat capacity of water...
August 7, 2011

physics
A diver descent 100 m below sea level. If the density of sea water is 1024 kg m-3, find the pressure she will experience.
August 7, 2011

math 1012
what is the sum of the lengths 39cm and 2m
August 4, 2011

Geometry
I have a question! Can someone please answer the same question but with the numbers 35, 56, 35, 84,110
July 24, 2011

Pre Calc
Verify the following identity: sin(x)*cos(x)*(cot(x)+tan(x))=1 show work
July 5, 2011

Physics
A 0.02 kg-lead bullet traveling 200 m/s strikes an armor plate and comes to a stop. If all of it's energy is converted to heat that it absorbs, what is the temperature change?
June 25, 2011

chemistry
If 1.5 mol of each of the following compounds is completely combusted in oxygen, which one will produce the largest number of moles of H2O and why?
June 21, 2011

Physics
A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the ...
June 15, 2011

algebra 2
if a3 = 20 and a6=41 for an arithmetic sequence, find a1
June 5, 2011

7th math
Simply the expression. -1 - (-3x + 2) - 7x + 8
May 23, 2011

physics
A moving object has a kinetic energy of 133 J and a momentum with magnitude of 39.8 kg·m/s. Detemine the mass (kg), and velocity (m/s) of the object.
May 19, 2011

science
list two things green plants need to grow and thrive
May 17, 2011

science
I would like to know migration helps butterflies survive?
May 17, 2011

Thermo engineering
The driveshaft of a building’s air-handling fan is turned at 300 RPM by a belt running on a 0.3-m-diameter pulley. The net force applied by the belt on the pulley is 2000 N. determine the torque applied by the belt on the pulley, in N.m, and the power transmitted, in kW.
May 10, 2011

Thermo Dynamics
Air loses heat to the surroundings at a rate of Q.= t/6 where out Q. is in Watts and t is time in seconds. For 20 minutes of operation, determine the heat loss from the air in kWhr???
May 10, 2011

Math
Hai take 12 minutes to walk to school. He wants to get there.15 mins early to meet with his lab partner. What time shod he leave his house is school starts at 8:10 am?
May 3, 2011

Algabra
I need help solving this using U- Substitution (x^2-4)^2 + (x^2-4) -6=0
April 27, 2011

Finance
Using Monte Carlo simulation, calculate the price of a 1-year European option to give up 100 ounces of silver in exchange for 1 ounce of gold. The current prices of gold and silver are $380 and $4, respectively; the risk-free interest rate is 10% per annum; the volatility of ...
April 25, 2011

Math: Statistics
My homework has a list of numbers and I'm working with standard deviation. I know the standard deviation as well as the mean and everything, but it says to find "the weight that is 3 standard deviations below the mean." What is the formula for that, and can I do ...
April 19, 2011

physic
b) •It is done by Carbon dating. Carbon is the basic basic building block of life and has an amazing memory. Rays of the Sun which are radioactive enter our atmosphere and collide with Nitrogen atoms to create the radioactive isotope, Carbon-14. •We have both Carbon-...
April 16, 2011

math
At the end of an basketball game daniels couch told him he scored 20% of all of his teams points. If Daniel scored 19 points exactly how many points did his team score?
April 7, 2011

trig
Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Does this question even make sense?
April 6, 2011

Calculus
Using L'Hopital's Rule, find the limit: lim x->0+ (as x approaches 0 from the right) of sinx/x^(1/3)
March 28, 2011

Fractions-easy 5th grade
Multiply and divide. 1) -2 4/11(-2) 2) 5 1/7 / 4 1/8
March 19, 2011

algebra
y=-2,8
March 19, 2011

math
50+55=x x=105
March 19, 2011

algebra
fx^3+18fx^2+81fx+12 ____________________ 4
March 19, 2011

Math
Divide and multiply. 1) -2 4/11(-2) 2) 5 1/7 / 4 1/8
March 19, 2011

Physics
A coil is made up of 19 square loops with the sides equal to 5.3 cm. The coil is placed in a uniform 350 mT magnetic field with the axis of the coil parallel to the magnetic field. If the field reverses direction in 0.17 seconds, what is in volts, the average emf induced in ...
March 11, 2011

geometry
Quadrilateral ABCD is a rhombus with diagonals AC and BD. if angle M equals 25 find the measures of angles 2 , 3 , 4 and 5
March 10, 2011

physics
A 3.00 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.94 m in 1.70 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
March 10, 2011

physics
A 3.3 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 4.2 m/s2, find the force exerted by the rope on the bucket of water
March 10, 2011

Physics
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is 5.30 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.70 106 ...
March 4, 2011

Trigonometry
F(X) = 2x^3-5x^2-19x+1 / x^2-9....I need the vertical asymptote, horizontal asymptote and the slant asymptote...please help!
March 4, 2011

social studies
Can you give more detail on websites instead of google
March 3, 2011

social studies
Compare/contrast real Julius Caesar to play by William Shakespeare
March 3, 2011

science
probably because of weight
March 3, 2011

math
a refrigerator is 3 ft wide, 2.5ft deep,and 6ft high. The walls and other parts other refrigerator take up to 20ft. How much cubic feet are left for food?
March 2, 2011

math
10/36
February 20, 2011

chemistry/HELP PLLEASE
KMnO4 + Fe2+ + 8H+ +4e- --> Mn2+ + Fe3+ + K+ + 4H20 Fe2+ should turn into 3+, not remain 2+
February 18, 2011

history
when did king louis(married to queen eleanor) die?
February 17, 2011

language arts
Diagram Either the suspect will come out or the police will go after him.
February 17, 2011

math
Draw 3 squares and 24 below. t=square ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt ttt answer=72
February 17, 2011

Intermediate Algebra
Solve for X (1/8)=(2/3)x-1/2
February 17, 2011

language arts
thanks
February 16, 2011

language arts
Diagram.(I'm not sure how you will give me the answer since you can't put lines on) Stephen almost never reads or watches TV and he does not enjoy outdoor sports.
February 16, 2011

Ap calc
A traffic engineer monitors the rate at which cars enter a freeway onramp during rush hour. From her data, she estimates that between 4:30pm and 5:30pm the rate R(t) at which cars enter is given by: R(t)= 100(1-0.00012t^2) car per min., where t is time in min. since 4:30. a. ...
February 15, 2011

Math
It's a trapeziod where the height is 13.8 in. and there is two lengths 8in. And 18 in. what is the area?
February 14, 2011

Math-7
Write and equation that could be used to find x the number of ounces in g gallons x=
February 10, 2011

Physics
Suppose a straight 1.25 mm diameter copper wire could just "float" horizontally in air because of the force of the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.00 multiplied by 10-5 T. What current would the wire ...
February 10, 2011

language arts peer edit
The Lightning Thief book and movie are different and same in many ways. The book of the Lightning Thief is more interesting and detailed for most people who read the book and watched the movie. The movie sometimes has things that the book doesn’t have and sometimes the ...
February 8, 2011

Language Arts
Is my first paragraph of the essay good? Correct some mistakes. The Lightning Thief book and movie are different and same in many ways. The book of the Lightning Thief is more interesting and detailed for most people who read the book and watched the movie. The movie sometimes...
February 8, 2011

science
what are the defers and the offence of the crocodile?
February 8, 2011

science
what is the lifecycle of the crocodile?
February 8, 2011

science
what are the defence and offence of crocodile?
February 8, 2011

Pre-Algebra
solve for m 2/3m - 5 = n
January 26, 2011

Math
sole for the variable s r=2s - 8
January 26, 2011

Math plz help
1/2c - 1/4 < -3/4
January 25, 2011

math
lionel says the digits in his mystery number have a sum of 6. you say this mystery number if you count by 3's or count by 4's. what is lionel's mystery number?
January 25, 2011

economics
The table provides data on the demand for and the supply of eggs in the United States. At a price of _____________ there would be a surplus. Price (per dozen) $0.50 $1.00 $1.50 $2.00 $2.50 Quantity Demanded 90 80 70 60 50 Quantity Supplied 30 50 70 90 100 Answer Question 9 ...
January 21, 2011

criminal procedure
8. A journalist is being compelled to reveal a confidential source of information, but the source would be useful to the government in a criminal investigation, or helpful to a criminal defendant at trial. What constitutional issues are involved? Should the government be able ...
January 19, 2011

criminal procedure
Should members of the news media have greater access than the general public to court proceedings and court records? What about greater access to prisons to interview prisoners? What about greater access to police investigative files?
January 19, 2011

Math - D.E.Q.
The half-life of a radioactive isotope is the amount of time it takes for a quantity of radioactive material to decay to one-half of its original amount. i) The half-life of Carbon 14 (C-14) is 5230 years. Determine the decay-rate parameter  for C − 14.
January 18, 2011

math
146
January 17, 2011

math
A praire vole has an average of 9 babies per litter. if it has 17 litter in season about how many babies are produced?
January 17, 2011

math
8,050
January 17, 2011

math
A koala sleeps an average of 22 hours each day about how many hours does a koala sleeps in a year?
January 17, 2011

physics/dynamics
The position of a ball as its kicked upwards is measured as y(t) =−(4.9 t^2 + 20t + 0.50)m, where t is measured in seconds. Find the vertical component of velocity and acceleration of the ball as a function of time. If the ground is located at yg = 0, find the time...
January 12, 2011

math
idk
January 4, 2011

math
jim ran the 400-meter dash in 47 seconds. if he ran at a constant rate, about how many meters did he run in a second?
January 4, 2011

intro to algebra
I have a worksheet to do and I have TO SHOW ALL MY WORK: Can you help. If this is the problem 29+n=13 How do I show each step?
December 29, 2010

physics
Thanks
December 15, 2010

physics
20 kg , 30 cm diameter disk is spinning at 300 rpm. How much friction force must be applied to rim to bring the disk to a halt in 3.0s?
December 15, 2010

calculus
The moment of inertia about the pole(origin) of the plane region which is inside the cardiod: r = 1 + cosO and outside the circle r =1. It's mass density is equal to it's distance from the pole..... I need someone who is way smarter than me to help with this one... ...
December 8, 2010

Math
The mass of the solid inside the sphere: x^2+y^2+z^2=1, above the xy plane and below the cone z=SqRT(x^2 + y^2. It's mass density is equal to the square of a distance from the origin, setup in both spherical and cylindrical coordinates. I don't have to evaluate, but i ...
December 8, 2010

chemisty
how many grams of Na are needed to react with H2O to liberate 400mL of H2 gas at STP?
December 8, 2010

Math
Use lagrange multipliers to find the point on the plane x-2y 3z-14=0 that is closet to the origin?(try and minimize the square of the distance of a point (x,y,z) to the origin subject to the constraint that is on the plane) Help me please!
December 7, 2010

8th grade math
.10*(1/2)x+.25x = 9.00 x(.10*(1/2)+.25)= 9.00 x= 9.00 ___(.10*(1/2)+.25) x = 30 Since you times the dimes by 1/2, you take half of x. So Dimes = 15, and Quarters = 30 Check, .10(15)+ .25(30) = 9.00
December 7, 2010

Singing
I am having a total meltdown.... I want to sing, but my voice is too low! HELP!!
December 6, 2010

spanish
You are good. Nothing to add. Good job!
December 6, 2010

Chemistry
What volumes of 0.46 M HNO2 and 0.54 M NaNO2 must be mixed to prepare 1.00 L of a solution buffered at pH = 3.40? a) HNO2 b) NaNO2 answer in L
December 5, 2010

Chemistry
How many moles of NaOH must be added to 1.0 L of 1.4 M HC2H3O2 to produce a solution buffered at each pH? (a) pH = pKa mol (b) pH = 3.07 mol (c) pH = 5.15 mol
December 5, 2010

Physics
a 55 kg skateboarder starts out with a speed of 1.8 m/s. he does +80 J of work on himself by pushing with his feet against the ground. in addition, the friction does -265 J of work on him. in both cases, the forces doing the work are nonconservative. the final speed of the ...
December 4, 2010

math
how do I rewrite using the distributive property 3^2 + (9-3) 3 x (24/8) + 2
December 1, 2010

EXP105: Personal Dimensions of Education (ABA1047G
Identify at least two skills that you that you would like to improve. Provide details on what actions you will do to develop each skill. Who do you consider to be a part of your personal support system? How do they offer support and encouragement to you?
December 1, 2010

science
how much energy is required to raise 5 kg of silver 36 degrees celcius with a specific heat of 234 j/kg degrees celcius
November 30, 2010

Geometry
1. How many sides does a regular polygon have if one exterior angle is 90 degrees? 3 4 5 6 2. The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle. 67 77 87 97 3. The sum of the interior angles of a 7-gon is 900 1,...
November 30, 2010

geometry
1. An exterior angle of a regular polygon measures 30 degrees. What is the measure of an interior angle? 30 60 120 150 2. How many degrees are in each interior angle of a regular pentagon? 50 72 108 120 3. If all of the diagonals are drawn from a vertex of a hexagon, how many...
November 30, 2010

math
draw an rectangle that has an area of 12sq.in and a perimeter that is greater than 25in.?
November 29, 2010

Fine Art
Keystone questions? Hit me up. justintime5492 at yaahoo
November 29, 2010

chemistry
How many liters of 0.250 M HCl would be required to react completely with 7.50 grams of magnesium hydroxide?
November 28, 2010

college
If I combined 25.0 grams of aluminum hydroxide with 75.0 mL of 0.500 M HNO3 how many grams of aluminum hydroxide would be formed?
November 28, 2010

Chemistry
1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
November 28, 2010

Chemistry
1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
November 28, 2010

chemistry
A 0.20 M sodium chlorobenzoate (NaC7H4ClO2) solution has a pH of 8.65. Calculate the pH of a 0.19 M chlorobenzoic acid (HC7H4ClO2) solution.
November 28, 2010

chemistry
Calculate the pH of 3.9 10-8 M HNO3.
November 28, 2010

chemistry
Calculate the pH of a 5.20 10-3 M solution of H2SO4.
November 28, 2010

chemistry
What mass of KOH is necessary to prepare 799.9 mL of a solution having a pH = 11.68?
November 28, 2010

chemistry
You have 100.7 g of saccharin, a sugar substitute, and you want to prepare a pH = 5.80 solution. What volume of solution can be prepared? For saccharin (HC7H4NSO3), pKa = 11.70 (pKa = −log Ka).
November 28, 2010

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