Saturday
November 22, 2014

Posts by Wes


Total # Posts: 55

Math
[R] = [4/5 -3/5] and [S] = [-3/5 4/5] [-3/5 -4/5] and [4/5 3/5] are reflection matrices. Calculate [R·S] and verify that it can be identified as the matrix of rotation. Determine the angle of the rotation.
October 17, 2014

Calculus
Find all values of a and b so that the following function is continuous for all x ∈ R. f(x) = −3a + 4x^5(b) x ≤ −1 ax − 2b −1 < x < 1 3x^2 − bx + a x ≥ 1
October 14, 2014

Chemisty
How do I convert mols Ag2S to mols NaNO3?
October 8, 2014

Chemisty
A 1.91-g sample of a mixture of AgNO3 and NaNO3 is treated with excess Na2S(aq). The precipitate is filtered off, dried and weighed. The dried precipitate weighs 0.44 g. What is the percentage by mass of NaNO3 in the original mixture? I know I have to write the equation and ...
October 8, 2014

Chemistry
Cheers, thanks man
October 8, 2014

Chemistry
If one assumes the volumes are additive, what is the concentration, in mol/L, of NO3− in a solution obtained by mixing 263 mL of 0.167 M KNO3, 311 mL of 0.404 M Mg(NO3)2, and 713 mL of H2O?
October 8, 2014

chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
October 3, 2014

Chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
October 3, 2014

Chemistry
An aqueous stock solution is 85.0% H2SO4 by mass and its density is 1.83 g/mL. What volume of this solution is required to make 1.00 L of 1.35 mol/L H2SO4(aq)? Give your answer in millilitres, accurate to three significant figures.
September 30, 2014

math
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
September 28, 2014

Physics
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
September 28, 2014

Physics
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
September 28, 2014

Physics
Thanks a lot man, I really appreciate it
September 27, 2014

Physics
At bobpursley, why do you have 1/2(v^2/a)?
September 27, 2014

Physics
Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
September 27, 2014

Math
For the given point and line, find by projection the point on the line that is closest to the given point and use perp to find the distance from the point to the line. P (3,-5) line: x = (2,-4)+t(3,-4)
September 25, 2014

Physics
118 dollars
August 27, 2014

college physics
A horizontal spring with a spring constant k = 322 N/m is uncompressed from a length of 1.4 cm back to its unstretched length. Calculate the change in potential energy in Joules to 2 s.f.
June 7, 2014

college physics
You shoot a 57 gram dart vertically upwards from a catapult with a spring constant of 379 N/m. The catapult is initially stretched from the equilibrium point by 30 cm. What is the height above the starting point reached by the dart? Ignore air resistance and give your answer ...
June 7, 2014

college physics
A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.
May 26, 2014

college physics
What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero
May 26, 2014

physics
You drop a ball, mass 127.5 grams from a height of 83.0 cm. It bounces back to a height of 50.5 from the floor. What is the change in gravitational potential energy from the moment it is dropped, to the moment it reaches the maximum height from the bounce?
May 25, 2014

physics
You throw a ball with a mass of 182.2 g, with a speed of 4.6 m/s. Calculate the kinetic energy in Joules to 3 s.f. , and what is the uncertainty C=1 (Unsure: <67%) C=2 (Mid: >67%) C=3 (Quite sure: >80%)?
May 25, 2014

math
find the next 5 numbers in the pattern. 1 6 12 17 34 39 78
February 13, 2014

Pre-algebra
David must choose a number between 49 and 95 that is a multiple of 4, 6, and 8. Write all the numbers that he could choose. If there is more than one number, separate them with commas.
February 7, 2014

Math
Find a value that satisfies the inequality 0.7<x<0.81. Thank You
January 30, 2014

Math
A 10-FOOT LADDER IS PLACED AGAINST A VERTICAL WALL OF A BUILDING, WITH THE BOTTOM OF THE LADDER STANDING ON LEVEL GROUND 6 FEET FROM THE BASE OF THE BUILDING. How HIGH UP THE WALL DOES THE LADDER REACH?
November 30, 2013

math
A rocket is launch from the top of an 40 foot cliff with an initial velocity of 140 feet per second, the height h of the rocket after t seconds is given by the equation h=16t^2+140t+40. How long after the rocket is launch will be 30 feet from the ground?
November 26, 2013

math
a jar contains 5 blue marbles, 8 red marbles,4 white marbles,and 3 purple marbles. suppose you pick a marble at random not looking. what is the chance of getting a red marble
October 20, 2013

Math
an aquarium holds 6 and 1/4 gallons of water. the water level dropped to 4/5 of this amount .how much water should be added to fill the aquarium
September 16, 2013

chemistry
Calculate the pH of the following solutions. (A) 0.95 NaOH (B) 9.9x10^-10 M NaOH (C) 6.7 M NaOH
May 4, 2013

Physics - Tension
Two blocks are connected by a string and are pulled vertically upward by a force of 165 N applied to the upper block. (here is a rough diagram) ^ (F=165 N) I [block] ( <- 2.00 kg) I [block] ( <- 1.00 kg (a) Find the tension T in the string connecting the blocks. (b) If ...
February 19, 2013

physics
Thank you very much!
February 10, 2013

physics
A rock is dropped from a treetop 19.6 m high, and then, 1.00 s later, a second rock is thrown down. With what initial velocity must the second rock be thrown if it is to reach the ground at the same time as the first? I'm not sure how to find the initial velocity of the ...
February 10, 2013

Physics
Wes and Lindsay stand on the roof of a building. Wes leans over the edge and drops an apple. Lindsay waits, 1.25s afrer Wes releases his fruit and throws an orange straight down at 28 m/s. Both pieces of fruit hit the ground simultaneously. Calculate the common height from ...
February 2, 2013

Physics
Wes and Lindsay stand on the roof of a building. Wes leans over the edge and drops an apple. Lindsay waits, 1.25s afrer Wes releases his fruit and throws an orange straight down at 28 m/s. Both pieces of fruit hit the ground simultaneously. Calculate the common height from ...
February 2, 2013

Physics
Wes and Lindsay stand on the roof of a building. Wes leans over the edge and drops an apple. Lindsay waits, 1.25s afrer Wes releases his fruit and throws an orange straight down at 28 m/s. Both pieces of fruit hit the ground simultaneously. Calculate the common height from ...
February 2, 2013

math
I borrowed money from Joe. I spent 5.50 of it on lunch, and half of the rest on a present. To repay Joe, I borrowed 10.00 from Fred. If i started and ended with no money, how much did I borrow from Joe?
December 17, 2012

Government
You may choose a specific organization that is politically active. In the report, tell the goals of that organization. Explain what they do to carry on their agenda and reach their goals. Include the opportunities available for volunteer service. Are there opportunities to ...
October 15, 2012

physics
A car accelerates at a constant rate from zero to 37.8 m/s in 10 seconds and then slows to 13.5 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds?
October 6, 2011

Math - Calculus
A 13 foot ladder is sliding down a vertical wall at 1 ft/sec. How fast is the base of this ladder moving on a horizontal ground after 5 seconds?
May 22, 2011

Advanced Algebra
1.386
April 30, 2011

Chemistry
10A x 10hrs x 3600 s/hr = 36,000 coulombs. You forgot to multiply by 10A...it should be 360,000 coulombs. 36,000 is seconds in 10 hours.
April 28, 2011

12th Grade Government
egwag
November 22, 2010

entrepreneur
Describe how the owner uses capital and human resources to ensure revenue or control cost
September 3, 2010

trig
How do you express in terms of angles less than 90 degrees? sin 120 degrees cos 150 degrees tan 280 degrees
April 22, 2010

Math
How do you express in terms of angles less than 90 degrees? sin 120 degrees cos 150 degrees tan 280 degrees
April 22, 2010

math word problem
How many different committees of 4 people each can you select from a group of 10 people?
April 22, 2010

math
Simplify: y-(-y+5)
April 20, 2010

Physics
It is summertime and two boys cannot wait for winter. one boy exerts a 70 N horizontal force as he pushes his 58 ig friend on a snowboard across a cement sidewalk at a constant speed. what is the coefficient of kinetic between the sidewalk and the snowboard?
April 12, 2010

Math
A mail handler needs 3 hours to sort the mail, but with an assistant, it takes 2 hours. How long would it take the assistant to sort the mail working alone?
January 11, 2010

Ap Chemistry- Organic
How does polairty of isopropyl alcohol differ from polarity of water?
October 15, 2008

math riddle ALGEBRA WITH PIZZAZZ
Wat is it like to live under a carpet
April 6, 2008

communications
similarities and differences between writing routine and positive messages, negative messages, and persuasive messages. Recall the importance of the three step writing process and incorporate this process into your presentation. What is a routine message? The term routine is ...
November 6, 2007

Chemistry
CO + 2*H2 --> CH3OH How many moles of each reactant are needed to produce 3.60 x 10^2g CH3OH? I appreciate anyone who helps me with this. Also, please say the steps on how you got your answer. Balance the equation. I think it is balanced. Convert 360 g CH3OH to mols CH3OH. ...
February 6, 2007

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