Monday
November 24, 2014

# Posts by DAVE

Total # Posts: 617

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

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

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

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
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
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

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

Algebra
A number in the modulus can't be negative, it will always be positive.
March 14, 2013

algebra
Multiply 8 by 42, So the final answer will be 336.
March 14, 2013

chem
i got 88.6 degree celcius is it right?
March 14, 2013

chem
A 6.75-g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 55.8 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?
March 14, 2013

math
Two vectors have magnitudes of 3 units and 8 units respectively. The resultant of these two vectors has a magnitude of 8 units. What is the angle between these two vectors?
March 1, 2013

science
Expain why deep sea fishes are not crushed by the pressure of all of the water above them. I think maybe its because their density or mass is higher? Am I right?
February 26, 2013

science
deep not deepa
February 26, 2013

science
Expain why deepa sea fishes are not crushed by the pressure of all of the water above them. I think maybe its because their density or mass is higher? Am I right?
February 26, 2013

science
why is viscosity such an important property of matter?
February 26, 2013

MATH
Ans= 16(take out 4 socks from each sock color)
February 13, 2013

Physics
An airplane is ﬂying in a horizontal circle at a speed of 104 m/s. The 88.0 kg pilot does not want the centripetal acceleration to exceed 6.15 times free-fall acceleration. Find the minimum radius of the plane’s path. The acceleration due to gravity is 9.81m/s2. ...
February 8, 2013

physics
A clear plastic tube with a diameter of 12cm and 110cm high is filled to the top with mercury. (density = 13.6 kg/m^3). There are three holes, all with a radius of 2 millimeters located 15cm from the bottom, 50cm from the bottom and 80cm from the bottom. A) What is the ...
February 7, 2013

physics
A liquid (ρ = 1.65 g/cm^3) flows through two horizontal sections of tubing joined end to end. In the first section the cross-sectional area is 10.0 cm^2, the flow speed is 245 cm/s, and the pressure is 1.20 105 Pa. In the second section the cross-sectional area is 2.50 cm...
February 6, 2013

Geometry and Measurement
Anna builds a rectangular prism storage container with dimensions of 8 inches by 6 inches by 12 inches. She builds a second container with a greater volume by increasing the dimensions of the rectangular prism to 16 inches by 12 inches by 24 inches. How will the volume of the ...
February 6, 2013

Geometry and Measurement
If a can of ravioli with a diameter of 2 inches and a height of 4.5 inches holds 12 ounces of ravioli, how many ounces of ravioli would a can with the same height, but double the diameter, hold?
February 6, 2013

geometry and measurement
A pool designed for lap swimming is rectangular in shape with a uniform depth of 4.5 feet. If the pool is enlarged so that it holds twice as much water, which of the following statements could be true?
February 6, 2013

Algebra 1
8.A number raised to a negative exponent is negative. Always, never , or sometimes. 7. Evaluate 1/2a^-4b^2 a = -2 and b = 4. 6. Simplify. Write in scientific notation. (9 x 10^-3)^2 Thanks to anyone who helps right away and need right answer from the people who have already ...
February 4, 2013

Language art
Thanks ms.Sue it helped a whole lot
February 4, 2013

Language art
Just this one question please . 1.According to the MLA style, how should you format the title of a magazine article? A . In italics B. in quotation marks C. With underlining Please thankyou and anyone who has taking this please can you give me the correct answer? Thankyou ...
February 4, 2013

physics
This is my problem: A particle with a density of 0.9g/ml is suspended in a solution that has a density of 1.1g/ml. It cannot be sedimented. Using the equation that describes the movement of a particle in a centrifugal field, describe why this is true. The issue I'm having ...
February 2, 2013

Science
Yes 1. By attaching to them 2. Active Immunity 3. All of the above 4. Antibodies 5. Antigens They are all correct also I have something for you 1. According to the MLA style how should you format the title of a magazine article please I need help has any one did this I need ...
February 1, 2013

Science
Yes 1. By attaching to them 2. Active Immunity 3. All of the above 4. Antibodies 5. Antigens They are all correct
February 1, 2013

MATH HELP
I did that and it said it was wrong I need the amount after 8 years how do I do that
January 27, 2013

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