Friday

January 30, 2015

January 30, 2015

Total # Posts: 1,808

**Chemistry**

consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi
*January 29, 2015*

**art**

thanks
*January 23, 2015*

**art**

Ancient native Americans chose willow strips to make baskets because there were easy to bend and to. A. to find B. waterproof C. multi colored D. rare
*January 23, 2015*

**art**

ok I will thanks
*January 23, 2015*

**art**

Ancient native Americans chose willow strips to make baskets because there were easy to bend and to. A. easy to find B. rare and valuable C. multi colored D. waterproof I chose A is this correct
*January 23, 2015*

**art**

ok thanks
*January 22, 2015*

**art**

A sculptor creates a bust of a famous politician out of marble and places it in the outdoor courtyard of the capitol building. Why did he chose marble?
*January 22, 2015*

**Math **

we have 2 coins: coin 1 comes up with the probability of tails of 2/3 while coin 2 comes up with the probability of tails of 1/3 you dont know which is which so you pick one up at random and flip it . If its tails, you guess that the coin you picked up is coin 1 else you guess...
*January 19, 2015*

**calculus **

If 600 cm2 of material is available to make a box with a square base and a closed top, find the maximum volume of the box in cubic centimeters. Answer to the nearest cubic centimeter without commas. For example, if the answer is 2,000 write 2000.
*January 19, 2015*

**physics**

Please someone should help me with this. An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is ?
*January 16, 2015*

**physics**

Please how do i solve this? A body of mass 36kg falls through a viscous liquid which offers a drag of 260N on the body. The upthrust on the body at terminal velocity is?
*January 16, 2015*

**Physics (is my work correct????)**

A tension force of 2.50 N acts horizontally on a 2.00 kg block. The block accelerates at 0.750 m/s2. What is the force of kinetic friction? 2 x .75, = 1.5N (2.5 - 1.5) = 1N?????
*January 15, 2015*

**math**

yes
*January 15, 2015*

**math**

I meant wendays homework
*January 15, 2015*

**math**

on Tuesday, elena completed 20 of her math homework in 36 minutes. At that same rate, how long will it take her to complete 35 items for wendy's math home work
*January 15, 2015*

**Physics**

A 0.047 kg golf ball is driven from the tee with an initial speed of 54 m/s and rises to a height of 23.2 m. What is its speed when it is 6.0 m below its highest point?
*January 14, 2015*

**Pre-Cal**

A wire 360 inches long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire (to the nearest tenth of an inch)?
*January 12, 2015*

**chemistry **

what is the volume, in liter of 2.54 mol methane (ch4) gas? I've been stuck on this problem for hours, someone please help!
*January 4, 2015*

**Algebra**

Janice tosses a softball directly upwards with an initial velocity of 100 feet per second. Use the formula h = vt - 16t^2 to answer each question. a. When will the ball reach a height of 84 feet? b. When will the ball hit the ground?
*December 17, 2014*

**math**

Decide whether the each equation has one solution, no solutions,or infinitely many solutions. 1. 2(x-3)= 2X A.One solution B.No solutions C.Infinitely many solutions 2. 3(y-3)= 2y-9+y A.One solution B.No solutions C.Infinitely many solutions 3. 10x-2-6x = 3x-2+x A.One solution...
*December 17, 2014*

**Stupid Complicated English Grammar**

if this could be answered it would help man students. plz answer after you have submitted the activity
*December 16, 2014*

**Math **

Problem 6: Let a1,a2,.........a10 be an arithmetic sequence. If a1+a3+a5+a7+a9=17 and a2+a4+a6+a8+a10=15, then find a1.
*December 14, 2014*

**Algebra **

Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?
*December 13, 2014*

**Algebra**

Solve for x>0 in the following arithmetic sequence 1^2,x^2,3^2.....
*December 13, 2014*

**Algebra **

The fifth term of an arithmetic sequence is 11. If the difference between two consecutive terms is 1, what is the product of the first two terms?
*December 13, 2014*

**Algebra**

No it is equal
*December 13, 2014*

**Algebra **

Find all values of t such that [t] =2t+3. If you find more than one value, then list the values you find in increasing order, separated by commas. The brackets represent the floor sign function.
*December 13, 2014*

**English**

did you read the book?
*December 9, 2014*

**Math **

Find the positive difference between two solutions to the equation ∛(4-(x^2/3)) = -2
*December 4, 2014*

**Math **

What is the sum of all values of x which |x-3|+|3-x|-1=?
*December 4, 2014*

**AB Calculus**

For part 2 i got .17955, would this be considered correct?
*November 30, 2014*

**AB Calculus**

I figured out that part "A" is -3/8, but i can't figure out part 2, a or b. please explain and help. thanks. Sand is falling from a rectangular box container whose base measures 40 inches by 20 inches at a constant rate of 300 cubic inches per minute. a) how is ...
*November 30, 2014*

**CHem**

Iodine forms three compounds with chlorine. Choose the correct molecular shapes. ICl3 ICl5 ICl
*November 23, 2014*

**Math**

Our teacher hasnt taught us log, so how would I sove this problem?
*November 21, 2014*

**Math **

Suppose 81^x=64. What is 27^(x+1)?
*November 21, 2014*

**science**

Two train cars are connected to a locomotive as shown. Wach train has a force of kinetic friction equal to 50,000N. The locomotive pulls the two freight cars at a constant speed of 4.0m/s. Find the force of tension at each of the coupling points A & B.
*November 20, 2014*

**math**

HELP
*November 18, 2014*

**math**

?????????????????
*November 18, 2014*

**math**

Sorry i ment what is the total Weight.
*November 18, 2014*

**math**

Sam grew three pumpkins for the pumpkin growing contest.The pumpkins weighed 24 1/8 lb,18 1/2 lb, and 32 5/16 lb. Find the total cost of the pumpkins. I don't get it????
*November 18, 2014*

**Algebra - Can you PLEASE check - I"m stuck!**

Bob is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: F(N)=10(1.02)^n 1. Starting from 0 days, plug x-values into our function to find out how many days it takes for the plant to...
*November 17, 2014*

**Algebra - can you PLEASE double check my work?**

I'm confused what you mean by 3? I was thinking Irrational because you can not write as a ratio.??
*November 17, 2014*

**Algebra - can you PLEASE double check my work?**

Part A: Use the properties of exponents to explain why is called the fifth root of 18. 1. What property refers to roots and fractional powers? My Answer: Rule of exponents 2. How does it apply to 18^1/5? If you multiply 18^1/5 by itself 5 times, you get 18. Part B: The length ...
*November 17, 2014*

**Physics**

A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Acceleration due to gravity is g = 9.8 m/s2.
*November 16, 2014*

**chemistry**

45.1
*November 11, 2014*

**Physics**

A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical? (b) What is the greatest angle with the vertical that the...
*November 7, 2014*

**Physics**

A block of mass m = 800 g is released from rest and slides down a frictionless track of height h = 57.0 cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.49 cm ...
*October 24, 2014*

**Chemistry/mine engineering**

why are you solving for temp final??? we are looking for mass of the rod...?
*October 23, 2014*

**math**

Jack used the digits 4,5,6,7 to make the largest and smallest numbers possible. Then he subtracted the 2 numbers and came up with 2,997. What did Jack do wrong?
*October 23, 2014*

**Chemistry**

Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)
*October 22, 2014*

**chemistry**

write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction
*October 19, 2014*

**calculus**

find the x-coordinate of all points on the curve y=12Xcos(5X)-(30*sqrt3*X^2) + 16, pi/5<X<2pi/5 where the tangent line passes through the point (0,16), (not on the curve) I have absolutely no idea how to solve this one
*October 19, 2014*

**chemistry**

what volume of 0.150M Li2Sr solution is required to completely react with 130ml of 0.150M Co(NO3)2
*October 17, 2014*

**Chemistry**

It is SrCl2 not SrLi2
*October 17, 2014*

**Chemistry**

If 4.7M SrLi2 solution is diluted to 45L, what is the molarity of the diluted solution?
*October 17, 2014*

**Calc**

this problem has been a challenge for me.
*October 16, 2014*

**Calc**

Hi Reiny. According to my webwork. The answer it not correct. Any additional help?
*October 16, 2014*

**Calc**

Please help with implicit differentiation. Find dy/dx for 4x^3+x^2y-xy^3 = -4
*October 16, 2014*

**math**

Data were recorded for the demand and revenue of a given product. Find the linear regression line which represents the revenue function. Find the quadratic regression curve which represents the revenue function. Data Demand x Revenue y 1 0 100 2 4 139.2 3 8 176.8 4 12 212.8 5 ...
*October 15, 2014*

**physics**

A heavier mass m1 and a lighter mass m2 are 17.5 cm apart and experience a gravitational force of attraction that is 9.80 10-9 N in magnitude. The two masses have a combined value of 5.00 kg. Determine the value of each individual mass
*October 15, 2014*

**chemistry**

You have prepared 20.00 mL of a buffer, using 4.00 mL 0.010 M HA (weak acid) and 3.00 mL 0.010 M NaA (provides A-, the conjugate base of HA). pKa for HA is 6.25. How many moles of HA will be present in the mixture after addition of 0.20 mL 0.010 M NaOH?
*October 13, 2014*

**Chemistry**

Wow, THANKS!
*October 7, 2014*

**Chem**

when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual volumes and that density ...
*October 7, 2014*

**Chemistry**

Ok. Reported already
*October 6, 2014*

**Physics**

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North) Because when i add 8.6 and 12 it doesnt equal 15m. It should ...
*September 30, 2014*

**math**

Theater prices: Adult- $6.00 Student- $3.00 4 adult tickets and 6 student tickets on a night that offers the special deal that a free ticket is given with each ticket purchased
*September 23, 2014*

**Math**

Determine whether the graph of x=y^2-1 is symmetric with respect to the x-axis, the y-axis, the origin, or has no symmetry.
*September 19, 2014*

**Physics**

A stone is thrown vertically upward at a speed of 27.00 m/s at time t=0. A second stone is thrown upward with the same speed 2.060 seconds later. At what time are the two stones at the same height?
*September 18, 2014*

**Pre-Calculus**

Find all solutions of the equation and express them in the form a+bi 2x^2+3=2x
*September 14, 2014*

**math**

Damon can you help me. My name is Jake so find that one obviously. Much appreciated. I don't understand those problems.
*September 9, 2014*

**8th grade math**

Ms. Sue ... can you please help me with my questions. My name is Jake. Much appreciated.
*September 9, 2014*

**math**

Can someone help me with my questions please. HELP!
*September 9, 2014*

**Math...Help.Thx**

I got something different but I'll figure out how you got that. Thankyou.
*September 9, 2014*

**Math...Help.Thx**

CAN SOMEONE HELP ME PLEASE? STRUGGLING WITH BOTH OF THESE ?'s... PLEASE HELP!!! Merci.
*September 9, 2014*

**Math...Help.Thx**

20. READING: The number of pages P a student can read varies directly with the amount of time T in minutes spent reading. The student can read 90 pages in 60 minutes. Write an equation that relates P and T. PREDICT the number of pages the student can read if 90 minutes is ...
*September 9, 2014*

**MATH**

make up a set of 5 numbers having the following landmarks: median: 9, range: 7, minimum:5
*September 2, 2014*

**economics**

what circular flow the the following fall into 1)You receive $15,000 in profits from your half-owner of a Krispy Kreme franchise. 2)The Georgia Bulldogs sells season football tickets for $50.00. 3)What market determines the price per acre of farmland? 4)What market determines ...
*September 1, 2014*

**Science**

idk what do you think?
*August 26, 2014*

**Economics**

can someone teach me how to calculate per unit opportunity cost
*August 23, 2014*

**Economics**

Of your implicit and explicit costs of attending college, which is more, why?
*July 26, 2014*

**Calculus**

A water tank in the shape of a right circular cylinder has a volume that is increasing at the rate of 300pi cubic centimeters per hour. If the height is decreasing at the rate of 15 centimeters per hour, find the rate at which the radius is changing when the radius is 20 ...
*June 23, 2014*

**Calculus**

Water is leaking from the bottom of a tank in the shape of an inverted cone having an altitude of 12 feet and a radius of 2 feet. If the water is leaking at the rate of 0.25 cubic feet per minute, how fast is the water level decreasing when the water is 4 feet deep?
*June 23, 2014*

**physics**

Which one of these statements regarding standing waves on a string is FALSE Select one: a. The frequency of the first harmonic depends on the tension in the string b. The frequency of the first harmonic depends on the speed of the wave c. The frequency does not depend on the ...
*June 16, 2014*

**physics**

Which one of the following statements about standing waves on a string is FALSE? Select one: a. All other frequencies are integer multiples of the first harmonic b. The first harmonic is the lowest frequency standing wave that can be formed. c. The first harmonic has the ...
*June 16, 2014*

**physics**

The Bernouilli equation is a statement of which physical principle? Select one: a. COnservation of Momentum b. Newton's Second Law c. Pascal's Principle d. Conservation of Energy
*June 16, 2014*

**physics**

A mass of 2.9 g is hanging underneath a spring which has an unknown spring constant. The period of oscillation is 5.5 seconds. Find the spring constant in N/m. Give your answer to 2 s.f.
*June 16, 2014*

**physics**

A submarine dives down to a depth 9.5 beneath the surface of the ocean. Calculate the pressure in atmospheres at that depth, assuming the density of water is 1029 kg/m3, and the air pressure at the surface is 101.5 kPa
*June 15, 2014*

**physics**

A mass of 2.9 g is hanging underneath a spring which has an unknown spring constant. The period of oscillation is 5.5 seconds. Find the spring constant in N/m. Give your answer to 2 s.f.
*June 15, 2014*

**physics**

A spring and mass system are oscillating with an amplitude of 8.4 cm. The spring constant is 204 N/m and the mass is 540 g. Find the mechanical energy of the system to 2 sf.
*June 15, 2014*

**physics**

Which one of the following statements about an object performing Simple Harmonic Motion is TRUE? Select one: a. The object reaches its maximum speed as it passes through the equilibrium point. b. The object’s velocity is never zero. c. The object has a constant velocity. ...
*June 15, 2014*

**physics**

The elastic potential energy of an object may be negative Select one: True False
*June 9, 2014*

**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 9, 2014*

**physics**

Which one of these statements concerning elastic collisions is FALSE? Select one: a. The two objects remain together after collision b. The kinetic energy is conserved c. The momentum is conserved
*June 7, 2014*

**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*

**physics**

Which one of these statements regarding non-conservative forces is FALSE? Select one: a. A non-conservative force cannot have a potential energy defined for it. b. The work done by a non-conservative force may be either positive or negative depending on the direction of motion...
*June 7, 2014*

**physics**

Which one of these statements concerning elastic collisions is FALSE? Select one: a. The two objects remain together after collision b. The kinetic energy is conserved c. The momentum is conserved
*June 7, 2014*

**physics**

Which one of these statements regarding non-conservative forces is FALSE? Select one: a. A non-conservative force cannot have a potential energy defined for it. b. The work done by a non-conservative force may be either positive or negative depending on the direction of motion...
*June 7, 2014*

**Algebra**

Which represents the reference angle for 3pi/4? A) (3 pi)/4 B) pi/3 C) pi/4 D) pi/6 I have no clue on how to do this. (Looking at my unit circle I think A?)
*May 29, 2014*

**Algebra**

What is the period of the function? y = 2 cos pi x I said 2.
*May 29, 2014*

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