Saturday

November 1, 2014

November 1, 2014

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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