Sunday

January 25, 2015

January 25, 2015

Total # Posts: 642

**Math**

A boat has a speed of 4 m s −1 (relative to the surrounding water) and a heading of 170◦ . There is a current flowing from a bearing of 105◦ at a speed of 2.5 m s −1 . Take i to point east and j to point north. (a) Express the velocity u of the boat ...
*January 18, 2015*

**chemistry**

Lol wow, way to be a grammar nazi DrBob, but also, there is an algebraic method to balancing equations I learned in first year chemistry. I don't remember it, but if youre good in algebra, it would be very useful!
*January 12, 2015*

**Language Arts**

Nope, it was C, just took the assesment.
*December 17, 2014*

**Language Arts**

The choices are: A. The port of Boston was closed to all ships, and huge numbers of workers lost their jobs. Many people struggled to put food on their tables B. British soldiers were sent to Boston to enforce British Law. The soldiers camped on the common, carried muskets, ...
*December 17, 2014*

**Language Arts**

Which of the following statements best summarizes the "fiddler's bill" Bostonians had to pay for the tea party, as described in Section 1 of Chapter VII? I read the book and spark notes talking about it, but I still need help, does anyone know this?
*December 17, 2014*

**chemistry**

Iron and oxygen gas can react to form the magnetic oxide of iron Fe3O4. How many grams of Fe3O4 can be made from 13.2 g of O2?
*December 8, 2014*

**Fraction**

Convert both to fractions. 7 * 8 + 5 = 61/8 13 * 8 = 104/8 Subtract both fractions 104/8 - 61/8 = 43/8 Convert 43/8 to mixed number 43 / 8 = 5 3/8
*December 8, 2014*

**Chemistry**

You are correct, A.
*December 8, 2014*

**Math**

Convert the percent to a decimal. 50% -> .50 Multiply 36.75 by .50 36.75 * .50 = 18.375 Add 18.375 to 36.75 $55.125 is your answer
*December 8, 2014*

**general chemistry**

I know an alysia at kellam high school.
*December 8, 2014*

**Physics**

Thanks!
*December 8, 2014*

**Physics**

Consider the 690 N weight held by two cables. The left-hand cable had tension T2 and makes an angle of 41◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling.
*December 8, 2014*

**chemistry**

False
*December 6, 2014*

**chemistry**

The molar mass is 325.28804 g/mol. Divide the amount given by the molar mass and that is your # moles. Answer is .2278 moles
*December 6, 2014*

**chemistry**

Not enough info. What do you have .0025L of? Do you have any other info?
*December 6, 2014*

**chemistry**

Are you asking or telling?
*December 6, 2014*

**chemistry**

True
*December 6, 2014*

**chemistry**

Use PV=nRT. Knowns- V=.944L P=2.26atm T=257K R=(constant) .0821 Enter values into the equation and solve for n (moles)
*December 6, 2014*

**Physics**

bobpursley, is answering questions on this all you do?
*December 6, 2014*

**Physics**

The force required to stretch a spring varies directly with the amount the spring is stretched. A force of 29 pounds is needed to stretch a spring 39 inches. How much force is required to stretch the spring 27 inches? Answer in units of lb
*December 6, 2014*

**chemisty**

Ugh super easy. The molar mass is 20.1797 g/mol. Use the mass given and divide it by the molar mass. (1.6304 mols)
*December 6, 2014*

**Chemistry**

Is this AP Chem or regular chem?
*December 6, 2014*

**O-Chem**

Draw the mechanism of the reaction of (E)-stilbene with Br2.
*November 13, 2014*

**Science Question**

Richard has to move a 45.5kg couch in order to vacuum behind it. He is able to push against it with a force of 85.3N. He does unfortunately have to work against friction, but thankfully the coefficient of friction is very small 0.082 since it is on pads and a hard wood floor. ...
*November 4, 2014*

**Calculus**

find y' of 4(cos(x^3))^2 when x = 1. I got -24(1)(cos(1)(sin(1) = -0.4187 but the answer is -10.9.
*October 19, 2014*

**Math - Business Stats. PLS HELP!**

help pls!!! thank u in advance, i appreciate it greatly Alex, Alicia, and Juan fill orders in a fast-food restaurant. Alex incorrectly fills 20% of the orders he takes. Alicia incorrectly fills 12% of the orders she takes. Juan incorrectly fills 5% of the orders he takes. Alex...
*October 10, 2014*

**algebra**

as part of her training routine for basketball, shaylle alternates between cycling and running for exercise. she cycles at a rate of 14 mph and runs at a rate of 8 mph. if she spends 8.5 hours exercising and covers a total of 101 miles, how much time did she spend on each ...
*September 28, 2014*

**math**

I'm a bit confused on the whole lesson on finding coordinates on a graph. With prime or double Prime, and with the shapes. if some can explain it to me in a easier way, that would be cool. Thanks! (sorry if I didn't explain my problem well enough)
*September 11, 2014*

**Precal**

The point (r,theta) in polar coordinates is (7,5) in rectangular coordinates. What is the point (2r, theta + pi/2) in rectangular coordinates? So I tried this problem and got r = sqrt(74). But while finding the value of theta, I got it equal to cot(5/7) which ends up being ...
*August 9, 2014*

**Physics **

A 97 dodge neon locks it's brakes up and skids 15 ft before hitting a motorcyclist then continues to skid another 130 ft without throwing the rider or motorcycle out from in front of the car. The only damage to car is busted head light and bumper comes off the motorcyclist...
*August 9, 2014*

**Maths Probability**

Anyone know 5)?
*May 20, 2014*

**Please help w/ Algebra**

Could you explain why the length is 28-w?
*May 19, 2014*

**Please help w/ Algebra**

A rectangular field has a perimeter of 56 rods. If a strip 2 rods wide is cut from all sides of the field, the remaining part of the field has an area of 91 rods. Find the dimensions of the field.
*May 19, 2014*

**physics**

If an archaeologist finds an ancient fire pit containing partially consumed firewood and the 14C content of the wood is only 10% of an equal carbon sample from present day tree, what is the age of ancient site. 14 C has half life of 5730 years
*May 4, 2014*

**math**

A rectangle has side lengths of 5 centimeters and 3 centimeters. if the side lengths are doubled, will the area also doubal? Explain
*April 23, 2014*

**teaching**

How would you incorporate logic and experimentation into your curriculum and still emphasize Native American thinking into your curriculum? For example a science teacher could have students monitor and document the phases of the moon by dates and write down journal entries on...
*March 29, 2014*

**Fractions**

Last night 16/28 of the tenth grade girls and 19/30 of the tenth grade boys went to go ice skating. Did a greater fraction of tenth grade girls or boys went ice skating? Prove it.
*March 26, 2014*

**Finance**

what is the net present value of a note for $70,000, PAID MONTHLY AT $600, plus 7% interest
*March 24, 2014*

**Biochem**

If .1ml of serum, 5ml of reagent and 4.9ml of distilled water are mixed together what is the dilution of the serum in the final solution
*March 23, 2014*

**chemistry**

First convert both E^o to dG values then you can add them and reconvert the dG value back to E^o use n=1 for E1 n=2 for E2 and n=3 for Etotal (n=number of electrons transfered)
*March 21, 2014*

**math**

A farmer wants to construct a pen with 100 feet fencing. The pen will be divided into two areas. Find the dimensions of the big pen. You may use your calculator or the fact that the x-coordinate of the vertex of a parabola is x=-b/2a. I would like to show a picture but somehow...
*March 21, 2014*

**physics**

I agree, bob is using the PE equation (deltaPE=mgh)
*February 12, 2014*

**philosophy**

Explain the theoretical basis of ethical behavior?
*January 24, 2014*

**physics**

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 1.5 h, a swimmer makes exactly 77 laps in a swimming pool that is 27 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the ...
*January 21, 2014*

**physics**

I put 5.17km/h because it asks for it in km also i put 0 for avg velocity and that's wrong
*January 21, 2014*

**physics**

I just have the the total distance traveled. 7750
*January 21, 2014*

**physics**

If instead, the swimmer makes 77.5 laps in the same pool in 1.5 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed.
*January 21, 2014*

**physics**

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 1.5 h, a swimmer makes exactly 77 laps in a swimming pool that is 27 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the ...
*January 21, 2014*

**physics**

A rock is dropped from rest. How fast is it going after it has been falling for 8.3 s?
*January 21, 2014*

**physics**

A car starts at a position of x=6 km and has a speed of 6 mph. After 42 s the car has a speed of 60 mph. Determine the magnitude of the car's average acceleration during this time.
*January 21, 2014*

**Chemistry - Chemical Equilibrium**

Anyone, please?
*December 10, 2013*

**Chemistry - Chemical Equilibrium **

In a solution with carbon tetrachloride as the solvent, the compound VCl4 undergoes dimerization: 2VCl4 <-> V2Cl8 When 6.6834 g VCl4 is dissolved in 100.0 g of carbon tetrachloride, the freezing point is lowered by 5.97*C/ Calculate the value of the equilibrium constant ...
*December 10, 2013*

**physics**

(not right)
*December 6, 2013*

**physics**

35.935992
*December 6, 2013*

**Trigonometry**

A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? (Round to the nearest tenth of a second.) Remember: x = (v0 cos θ)t and y = h0 + (v0sinθ)t – 16 t^2
*November 30, 2013*

**physics**

A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? (Round to the nearest tenth of a second.) Remember: x = (v0 cos θ)t and y = h0 + (v0sinθ)t – 16 t^2
*November 30, 2013*

**Trigonometry**

Sketch the curve represented by the parametric equations x = 3 cos θ and y = 3 sin θ for 0≤θ≤π
*November 30, 2013*

**physics**

20. A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? (Round to the nearest tenth of a second.) Remember: x = (v0 cos θ)t and y = h0 + (v0sinθ)t – 16 t^2
*November 30, 2013*

**Trigonometry**

Find the value of 3sec2.4. (Round to the nearest tenth.)
*November 30, 2013*

**Trigonometry**

Find the value of 3sec2.4. (Round to the nearest tenth.)
*November 30, 2013*

**Trigonometry**

If Cot θ = -Square Root of 15/7, use the fundamental identities to find Cosθ > 0.
*November 29, 2013*

**English**

Read the passage below and answer the question: Jack: I’ll be there in 20 minutes. I’m stopping at the store to pick up some batteries. Do you need anything? Mike: Will you buy some coffee for me? I’ll pay you back when you get here. Which statement about Mike&#...
*November 19, 2013*

**PHYSICS**

Four long, parallel conductors carry equal currents of I = 9.50 A. The current direction of the current is into the page at points A and B and out of the page at C and D. Calculate the magnitude and direction of the magnetic field at point P, located at the center of the ...
*November 5, 2013*

**Algebra**

Solve for p 11 - 2(8+3p) = 49
*September 26, 2013*

**maths**

the probabilities of a boy passing English and Mathematics tests are x and y. What is the probability of failing both tests(a)1-(x-y)+xy(b)1-(x+y)-xy(c)1-(x+y)+xy(d)1-(x-y)-xy
*September 22, 2013*

**Chemistry**

a large amount of potassium in plant food could cause the formation of MgKPO4:6H2O along with MAPH. what would be the effect on the calculated percentage of P2O5 in question 1 if MAPH were mixed in with your precipitate? would the %P2O5 in this mixture be higher or lower than ...
*September 19, 2013*

**science**

a large amount of potassium in plant food could cause the formation of MgKPO4:6H2O along with MAPH. what would be the effect on the calculated percentage of P2O5 in question 1 if MAPH were mixed in with your precipitate? would the %P2O5 in this mixture be higher or lower than ...
*September 19, 2013*

**Finance**

Chip’s Home Brew Whiskey management forecasts that if the firm sells each bottle of Snake-Bite for $20, then the demand for the product will be 15,000 bottles per year, whereas sales will be 87 percent as high if the price is raised 17 percent. Chip’s variable cost ...
*September 13, 2013*

**Algebra 2**

tom and jerry were offered similar jobs at competing companies. sony offered tom a starting salary of $ 32,000 per year with a 7% raise at the end of each year.panasonic offered jerry a $35,000 annual starting salary with a 5% raise at the end of each year.
*September 8, 2013*

**Algebra 2**

tom and jerry were offered similar jobs at competing companies. sony offered tom a starting salary of $ 32,000 per year with a 7% raise at the end of each year.panasonic offered jerry a $35,000 annual starting salary with a 5% raise at the end of each year.
*September 8, 2013*

**Chemistry/Env Sci**

After doing the math, how do you figure out if it is oxidizing or reducing? How does the pKa apply?
*July 31, 2013*

**Chemistry/Env Sci**

a)the E0 for the reactions 2HOCl + 2H+ + 2e- → Cl2 + 2H20 and Cl2 + 2e- → Cl- are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl- and develop the full pE/pH equation for this reaction. b)What is the pE of a HOCl/Cl- solution ...
*July 31, 2013*

**Calculus **

This integral does not converge using the normal (Leibniz) definition of integration. Using the identity: int(0-->inf)f(t)/(t)dt = int(0-->inf)F(p)dp, find: integral(0-->inf)(cos(at)+cos(bt))/t dt
*July 29, 2013*

**Hvac**

3 resistors of 5 ohms,15 ohms, and 30 ohms are connected in series and placed across a 50 volt batt. Find the voltage drops acroos each resistor . And find the current through each resistor
*July 18, 2013*

**Chemistry**

I am doing this assignment for mastering chemistry and It just keeps telling me that it is wrong, I have no idea what the issue is.
*June 21, 2013*

**Chemistry**

Oh it sums up the heat? I thought it was delta G(products)-Delta G(reactants) wouldn't that then be 8*-228.6 + 6*-394.4-2*(-360.5)= giving you -3426.2 KJ/Mol. Could you explain why you made the 360.5 positive? Thanks.
*June 21, 2013*

**Chemistry**

2CH3CH2CH2OH(l)+9O2(g)→6CO2(g)+8H2O(g) I have to find the delta G delta G of CH3CH2CH2OH(l)=−360.5 KJ/Mol delta G of O2(g)=0 KJ/Mol delta G of CO2(g)=−394.4 KJ/Mol delta G of H20(g)=−228.6 KJ/Mol I keep getting -3426.2 KJ/Mol but its not correct.
*June 21, 2013*

**Chemistry**

Running through I got the answer 1.97x10^-31 but it is telling me I am wrong.
*June 21, 2013*

**Chemistry**

Delta Gf= -RT*ln(K) R is 8.314 T is 298
*June 21, 2013*

**Chemistry**

delta Gf for NO(g) is 87.6 kJ/mol delta Gf for both O2 and N2 gas is zero
*June 21, 2013*

**Chemistry**

Calculate the equilibrium constant for the following reaction at room temperature, 25 ∘C: N2(g)+O2(g)→2NO(g)
*June 21, 2013*

**Physic**

Me and my friend are playing on a Ferris wheel which has Radius of 20 Meter and had an constant angular velocity of 0.2 rad/s . Then, When I'm at the very top of the Ferris wheel i'm going to drop a tennis ball( dropping without initial velocity). How far around the ...
*June 15, 2013*

**math**

steve is .1 off but its 44.62
*June 10, 2013*

**Physics**

A helicopter is flying in a straight line over a level field at a constant speed of 6.2 m/s and at a constant altitude of 11.3 m. A package is ejected horizontally from the helicopter with an initial velocity of 14.0 m/s relative to the helicopter, and in a direction opposite ...
*June 9, 2013*

**FSE 120**

A compartment measures 3.5 meters by 5.5 meters and is 3 meters high. A fire raises the temperature from 68of to 1500 of. If the starting pressure was 1 atmosphere, what volume is present at the elevated temperature assuming the compartment has openings to reduce pressure? For...
*May 30, 2013*

**Calculus**

Intergrate the following. y = cos(x)(2sin(x)-1)^6
*May 25, 2013*

**statistics**

"about 2 times as accurate" is the right answer
*May 20, 2013*

**math**

0.1818 is the correct one
*May 19, 2013*

**math**

0.5741 are wrong
*May 19, 2013*

**Statistics**

C. 0.0229 is the correct one
*May 18, 2013*

**mathematic**

0.1818 is the correct one (Believe)
*May 18, 2013*

**Statistics**

0.25 is the correct one
*May 12, 2013*

**Chemical engineeing **

Can someone help me with online exam ( fundamental of chemical engineering class ) ? Please eamil me ( davd_jo(at)(ya h o o )dot (com ) I'll offer money
*May 6, 2013*

**math**

Elizabeth has a box of shirts. one half of the shirts are small, 2/5 of the shirts are medium, and 5 shirts are large. How many shirts are in the box?
*May 1, 2013*

**Stats**

stupid question... A would be: 0.004096 B would be: 0.592704 C would be: 0.112896
*April 30, 2013*

**Stats ~ Please Help **

I am so lost and I have test tomorrow. Thank you to anyone who can help The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have...
*April 30, 2013*

**Stats**

The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have blue eyes c. Find the probability that one of the three has blue eyes
*April 30, 2013*

**Math**

Andrew has 12 coins, all dimes and nickels, and they add up to $1.00. How many nickels does he have?
*April 9, 2013*

**Science**

how many kw is an airflow of 30m³/s @130°C
*March 18, 2013*

**science**

0.0928
*March 18, 2013*

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