Sunday
April 26, 2015

Posts by dave


Total # Posts: 687

physics
A man walks 5.0m due east and then 10.0m N30oE . Find his resultant displacement
April 17, 2015

Physics
thank you kind sir
April 8, 2015

Physics
What is the mass of a child if the force of gravity on the child's body is 100 N? A. 9.8 kg B. 4.45 kg C. 22.5 kg D. 10.2 kg what?
April 8, 2015

Physics
Oh My God, thank you so much
April 8, 2015

Physics
If a tank contains water 4 m deep, what is the pressure at the bottom of the tank? (Neglect the atmospheric pressure.) A. 39.2 kPA B. 18.9 kPA C. 4.0 kPa D. 9.8 kPA Im really lost
April 8, 2015

Consumer Math
If XYZ stock is quoted at 523/4 per share, what is the market price per share A. $52.75 B. $52.34 C. $275.00 D. $75.00? A?
April 3, 2015

American History
thank you, I was pretty confused
April 3, 2015

American History
then D?
April 3, 2015

American History
Which statement best describes the Monroe Doctrine? A. The United States welcomed European involvement in all issues in North America. B. The United States welcomed any European involvement in South America. C. The United States pledged to involve itself as much as possible in...
April 3, 2015

American History
thank you
April 3, 2015

American History
American soldiers first faced guerilla tactics during which war? A. Philippine-American War B. World War II C. Vietnam War D. Korean War I believe its A
April 3, 2015

American History
so D? or B?
April 3, 2015

American History
so D?
April 3, 2015

American History
Which of the following directly led to the American Civil War? A. The Lecompton Constitution B. The secession of many Southern states from the union C. The decision in the Dred Scott v. Sandford case D. The election of Abraham Lincoln C?
April 3, 2015

Physics
A hockey player is initially moving at 5.00m s to the east. Her mass is 50.0 kg. She intercepts and catches on her stick a puck initially moving at 35.0m s at an angle of 30 degrees (Fig. 6.40). Assume that the puck’s mass is 0.50 kg and the two form a single object for a...
April 1, 2015

chemistry
Work it out
March 18, 2015

World History
I have, i couldnt find anything, can you direct e to a website with information that you might find is useful to me?
March 10, 2015

World History
so its either A or C
March 10, 2015

World History
thats whats tripping me up, one says leader while the other says head, Sukarno was the first president but im not sure if suharto was first leader of anything
March 10, 2015

World History
?_? actually, i answered incorrectly, i thought the question was asking for a true statement, but now im confused, wasnt indonesia formerly the netherlands east indies?
March 10, 2015

World History
Regarding Indonesia, which of the following statements is false? A. Indonesia was formerly the British East Indies. B. The first head of Indonesia was Sukarno. C. The first leader of Indonesia was Suharto. D. Indonesia was formerly the Netherlands East Indies. D?
March 10, 2015

Algebra
Find the principal when the amount in the account is 11,000 and rate of interest is 3.45 percent compounded interest is quarterly for 2.5 years.
March 5, 2015

Calculus Physics
Use newton's law of gravitation F=G*(m1m2/r^2) we get: G*(81.4 m1*m2)/r^2 = G*(m1*m2)/(3.85x10^8-r)^2 you can then cancel the G, m1, m2 and get 81.4/r^2=1/(3.85x10^8-r)^2 take sqrt: sqrt(81.4)(3.85x10^8-r)= r solve for r r=346,585,261m ..... and yes Tenzin hes from CCNY lol
March 2, 2015

Physical Science
The main difference between the internal combustion engine and the diesel engine is that the diesel engine A. does not have a crankshaft. B. does not utilize pistons. C. has no connecting rods. D. has no ignition system. pretty sure its d
February 27, 2015

Chemistry
okay, now im sure its D
February 25, 2015

Chemistry
oh my, my mistake, then would it be D or B?
February 25, 2015

Chemistry
oh my, my mistake, then would it be D or B?
February 25, 2015

Chemistry
A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution. A. unsaturated B. saturated C. dilute D. concentrated im pretty sure its C
February 25, 2015

Chemistry
thank you i wasnt sure :)
February 25, 2015

Chemistry
The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. definite proportions. B. atomic disintegration. C. conservation of energy. D. conservation of matter. im not sure ...
February 25, 2015

Science
Reflecting telescopes are popular because they're A. more durable than a refracting telescope. B. easier to build than a refracting telescope. C. smaller than a refracting telescope. D. more powerful than a refracting telescope i said b but im torn between a and b
February 25, 2015

Electricity and Electronics
thanks ;D
February 24, 2015

Electricity and Electronics
A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the ...
February 24, 2015

Algebra
Isaac wants to enclose his backyard with a fence that is bounded on one side by the back of the house. if he has 164 feet of fencing material find the maximum area that can be enclosed by the fence.
February 20, 2015

math
A real estate agent makes 4.5% commission on every property she sells. How much commission does she make on a sale of a house for $132,500.00? Don't understand how to do the problem. Can you help me? Thank you
February 17, 2015

Physics
W=Fd 312J=F(2.0m) F=(312J)/(2.0m)
February 13, 2015

Algebra
Length of a side on a square is 5cm longer than the side of another square. the total area is 193cm. what is length of original?
February 10, 2015

Math
144
January 29, 2015

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

statistics 7
riggle
September 23, 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

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