Monday
February 27, 2017

# Posts by dave

Total # Posts: 844

physics
ok does anyone know how to do this i need step by step help on this
February 10, 2012

math
sams bday is 186 days after jims bday. susans is 24 days after jims. sam was born on sept 6th. what day was susan born on if it was not a leap yr?
February 8, 2012

math
A disc jockey has 10 songs to play. Seven are slow songs, and three are fast songs. Each song is to be played only once. In how many ways can the disc jockey play the 10 songs if The songs can be played in any order. The first song must be a slow song and the last song must be...
February 6, 2012

dynamics
If end A of the rope moves downward with a speed if 5 m/s, determine the speed of cylinder b
February 3, 2012

Physics
You are driving to the grocery store at 12.7 m/s. You are 108.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.470 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
January 28, 2012

physics
A hot-air balloon plus cargo has a mass of 1740 {\rm kg} and a volume of 12030 {\rm m^3}. The balloon is floating at a constant height of 6.25 {\rm m} above the ground. What is the density of the hot air in the balloon?
January 26, 2012

physics
A hot-air balloon plus cargo has a mass of 1740 {\rm kg} and a volume of 12030 {\rm m^3}. The balloon is floating at a constant height of 6.25 {\rm m} above the ground. What is the density of the hot air in the balloon?
January 26, 2012

physics
A horizontal pipe carries oil whose coefficient of viscosity is 0.00010 ns/ m^{2}}. The diameter of the pipe is 5.5 cm, and its length is 60 m. What pressure difference is required between the ends of this pipe if the oil is to flow with an average speed of 1.2 m/s? What is ...
January 26, 2012

Physics
A tin can is filled with water to a depth of 50 cm. A hole 16 cm above the bottom of the can produces a stream of water that is directed at an angle of 35degrees above the horizontal. Find the range of this stream of water. Find the maximum height of this stream of water.
January 26, 2012

physics
8 1/4 "tall 20 1/4" wide @ bottom what is angle?
January 19, 2012

pennfoster
Which of the following sentences contains a verb in the simple past tense? A. I was working overtime for about six months. B. We helped Joan to pack her things. C. She would like to join us. D. Jenna has driven this route multiple times.
January 19, 2012

Math
Renie gave each of six peopple 1/10 of pizza. Renie has 2/5 of the pizza left. Explain how this is true.
January 13, 2012

Math
you have four $5.00 bills. You buy a shirt for$10.00 What fraction of money do you have left. Use equivalent fraction.
January 13, 2012

Math
you have four $5.00 bills. You buy a shirt for$10.00 What fraction of money do you have left. Use equivalent fraction.
January 13, 2012

physics
a .65 kg ball is attached to the end of a string. it is swung in a vertical circle with a radius of .50 m. at the top of the circle its velocity is 2.8 m/s.
December 15, 2011

Finite Mathematics
I just need help with the set up of this problem, that's where I'm getting lost. A mining company operates two coal mines, M1 and M2. The company sells the coal to three purchasers: two steel mills P1 and P2, and a power generating station P3. The cost of transporting ...
December 13, 2011

physics
A 64.2-kg skier coasts up a snow-covered hill that makes an angle of 23.8° with the horizontal. The initial speed of the skier is 7.18 m/s. After coasting 1.96 m up the slope, the skier has a speed of 3.13 m/s. Calculate the work done by the kinetic frictional force that ...
November 26, 2011

physics
hi, reading over momentum notes and i just want to clarify a few things. if i had a system containing a cart that was moving (cart 1) and then a cart that was stationary (cart2)would there be any net external force acting on the system between the initial position of cart 1 ...
November 13, 2011

calculus
The population of a country was 8.4 million people in 2000. Three years later, the population of the same nation was 9.3 million people. Assuming that population is growing exponentially, what is the projected population (rounded to one-tenth of a million) of the country in ...
November 10, 2011

physics
Pleaseee help explain how to draw the free body diagrams for this problem!!! Two blocks with masses m1 = 10.9 kg and m2 = 79.3 kg, shown in the figure (in the figure the 79.3kg block(m2) is on a flat surface, the 10.9kg(m1) block is pinned against the block with the greater ...
November 9, 2011

computers
MS Word Quiz. "Browse Headings" in the Nav Pane organizes your document into a .... Answer a. heirarchy b. picture c. print preview d. keyword search
November 8, 2011

science
A disk and a ring, both of mass and radius, are placed at the bottom of an incline and allowed to roll down. Give an expression for the kinetic energy of the disk at the bottom of the incline in terms of mass, radius and translational velocity. how does this kinetic energy ...
November 7, 2011

chemistry
How many milliliters of a 110mL solution of 1.5 M AlCl3 must be used to make 70mL of a solution that has a concentration of 0.2M Cl–?
November 3, 2011

Math
Ten rabbits are riding in wagons. Two rabbits sit in each wagon. How many wagons are there? Three jump out of the wagons. How many rabbits are still riding in wagons?
October 25, 2011

Chemistry
If HOCl has a Ka=3.2*10^-12, what is the pH of 0.1M KOCl?
October 23, 2011

science
1. How much potential energy does a 5kg block have if it is 2m above the ground? 2. What is the mass of an object that has 40J of potential energy and is 10m above the ground? 3. What is the weight of an 8kg object? 4. How much work does it take to lift an 8kg object 2m? 5. ...
October 22, 2011

physics
A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newtons law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
October 19, 2011

physics
A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
October 19, 2011

college math
find the slope of the tangent line to the graph of f at the given point. Graph f and the tangen line. 9. f(x) = 3x +5 at (1.8) 10. f(x)=2x + 1 at (-1,3) Please, help me with this problems. thanks
October 19, 2011

math
a1=8,d=3,n=16 the one is a little below the a
October 16, 2011

Physics
25 Newtons
October 13, 2011

Investment
1.If a stock's return has a large standard deviation, that suggests the stock has little risk is tru or false. 2.If the return on two stocks is highly and positively correlated(i.e., correlation coefficient=+1.0), combining these stoocks will reduce the risk associated ...
September 30, 2011

english
can u help me with this rhyme? small parts of wild plants it's dealing with possessive nouns
September 23, 2011

physics
A ball, initially at y = 0, is thrown straight down and takes 1.40 s to move 13.8 m in the - y direction. Calculate the initial velocity of the ball.
September 22, 2011

physics
A figure skater is warming up on the rink. She does a lap of a 100m rink. She completes the laps in 3 minutes. What was her speed? Answer a. 33.3 m/min b. 300 m/min c. 66.7 m/min my answer b.300 m/min ?????
September 19, 2011

physics
What is the velocity of a car going east for 50 miles in one hour? my answer. 50 miles/hour (east)?????
September 19, 2011

physics
A figure skater is warming up on the rink. She does a lap of a 100m rink. She completes the laps in 3 minutes. What was her speed? Answer a. 33.3 m/min b. 300 m/min c. 66.7 m/min my answer b. ?????
September 19, 2011

physics
A figure skater is warming up on the rink. She does a lap of a 100m rink. She completes the laps in 3 minutes. What was her speed?
September 19, 2011

chemistry
From a 1M Tris solution, how is a 400ml of 0.2 M Tris prepared? I have no idea where to start
September 18, 2011

Chemistry
Iron reacts with HCl solution to give H2 gas and Fe2+ ions. Suppose that 5.3 g of iron are to be dissolved in 1.7 M HCl. What is the minimum volume (in mL) of the acid solution required to react with all of the iron?
September 11, 2011

Prob and Stats
The Roper Organization conducted identical surveys 5 years apart. One question asked of women was Are most men basically kind, gentle, and thoughtful? The earlier survey revealed that, of the 3,000 women surveyed, 2,010 said that they were. The later revealed 1,530 of the 3,...
September 5, 2011

Physics
Where does V^2/g come from?
August 9, 2011

Physics
drwls - Your answer isn't correct either. The horizontal distance traveled is V*cos 45*t + Vj*t, and the time it takes for the grenade to reach the ground is SQRT(2Vsin45/g)
August 9, 2011

economics
Assume a monopolist with the following demand and cost relationships. Q = 400 - 20p TC = 10 + 5q + q2 Calculate the following: Profit max price Profit max quantity TR, TC, Profit, and the elasticity at profit max q and p.
June 23, 2011

geometry
The midpoint of mc is G. If AT = 42 and AG = 2x – 5, what is x?
June 17, 2011

trig
Why are the quadrants situated and numbered the way they are.What is the purpose.
June 13, 2011

World History
This man was responsible for the painting of the Sistine Chapel, as he spent 4 years lying on his back atop a scaffold , just a few feet from the ceiling.?
June 9, 2011

world history 10
A COW???
June 9, 2011

world history 10
boats ships???
June 9, 2011

world history 10
What transportation vessel and animal are on the family crest of the McDonalds of Scotland ? (Mr. G's ancestors)
June 9, 2011

Math
Add fraction and mixed numbers and reduce to lowest term 9 2/3 3 2/5 3/4 Can someone explain how to solve?
June 2, 2011

College math
What is the probability without replacement of drawing at least one ten (52 card deck)?
May 2, 2011

Physics
a 1.75kg pistol lies at rest on an essentially frictionless bench. it accidentally fires and shoots a 25 gram bullet parallel to the bench. How far has the bullet moved by the time the gun has recoiled 2.60mm?
April 25, 2011

algebra
x+(xtimes.15)=1725
April 20, 2011

College Physics
I'm asked to find the shortest wavelength photon emitted for the paschen series for the hydrogen atom. I used the Rydberg equation and substituted the appropriate values. Frequency= Rh(1/3^2)-(1/infinity^2) I get an answer of 820 nm. My online homework program said this ...
April 19, 2011

calculus
I need a step-by-step limit definition of derivative for y = ln(x).
April 13, 2011

spanish
Answer the questions negatively, using the imperfect tense. Make sure to include the direct object pronoun when needed. Follow the model. Modelo ¿Juega Daniel al fútbol? No, pero antes lo jugaba. ¿Hablas por teléfono? No hablaba ¿Fue a la ...
March 31, 2011

Chemistry
what is the equation for the reaction of Cu(NH3)subscript2(SO4) with NaOH?
March 16, 2011

spanish
. Hay una variedad de las bebidas y los postres deliciosos también My teacher marked that sentence down, and according to her there is suppose to be a verb between postres and deliciosos, which i am having trouble figuring out. Can any one help?
March 9, 2011

engineering
If a pogo stick was to be reinvented and you were to choose the spring type. What type of spring will generate the most return of kinetic energy compared to least amount of force needed to compress the spring...you can use leaf, coil, scissor, compression, or extension type ...
March 7, 2011

Physics
hi, don't know the answer, i didn't even go to college.... i am trying to invent a device that will aid in handicapped sports... i am trying to load a spring with the least amount of energy and compound it into the highest kinetic force i can.. only thing loading this ...
March 5, 2011

pre-calculus
please help me with thisone thanks solve the inequality algebraically. Express the solution in interval notation. (x-8)^2/x^2-36 > 0
March 1, 2011

Physics
Part 1 You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 10000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.47 m and the cannon is aimed at a 42degrees angle from the ...
February 27, 2011

Physics
The initial kinetic energy imparted to a 0.1 kg bullet is 1036 J. The acceleration of gravity is 9.81 m/s2 . Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained. Answer in units of km.
February 27, 2011

Physics
Rosie (mass 58 kg) pushes a box with a horizontal force of 120 N (26.976 lb) at a speed 25 m/min. What is Rosie’s power output? Answer in units of W
February 27, 2011

Physics
A 1760 kg car accelerates uniformly from rest to 8.8 m/s in 4.52 s. Find the work done on the car in this time. Answer in units of J.
February 27, 2011

Physics
A block of mass 5 kg, which has an initial speed of 3 m/s at time t = 0, slides on a horizontal surface. Find the magnitude of the work that must be done on the block to bring it to rest. Answer in units of J.
February 27, 2011

Math
do adult men go out to dinner alone more than adult women and what is the percentage of men versus women women dine alone?
February 24, 2011

spanish 4
César le da consejos a un amigo en su primer día de trabajo porque el director de la cadena tiene muy mal humor. Escucha los consejos y cámbialos a mandatos. Sigue el modelo. Play audio For number 1 this is what the person says 1)el siempre pide que hagas...
February 23, 2011

math
I need someone to help explain how this math problem works. I am not sure how to convert this fraction below to arrive at 100.8 degress. 7/25 .360 degrees=100.8 degrees How did this answer of 100.8 degrees come about in this equation?
February 23, 2011

Physics
Newtons second law is Force=mass(acceleration) F= 20 N m= 8 kg Newton (N)= kg.m/s^2 20N=8kg(a) a=2.5 m/s^2
February 21, 2011

math
Does anyone know how can I apply the Pythagorean Theorem to real world situations.
February 21, 2011

math
Having trouble with these pairs of numbers (20,21,29) - (28,45,53) I am supposed to develop a Pythagorean triple. Here is that I am supposed to use which is a formula that can be used to generate infinite number of generating Pythagorean triples is: a = (2mn); b= (m^2 - n^2...
February 21, 2011

math
Could someone please describe two main differences between classical and empirical probabilities.
February 17, 2011

math
I do not know how to answer this question. Would someone please help me with each of the four question below? Thank you. Question 1. Write the sample space for the outcomes of tossing three coins using H for heads and T for tails. Question 2. What is the probability for each ...
February 17, 2011

math
This is what I am trying to solve for - x2 – 2x – 13 = 0 - x2 - 2x = 13 step (a): move the constant term to right side of the equation 4x2- 8x = 52 step (b): multiply each term of the equation by 4 times the coefficient of x2 – in this case 1x4 = 4 (trying to ...
February 13, 2011

math
In this equation 4(x^2 – 8x) = 4(13), what would the coefficient of x^2 be in this case? Would this be correct 4x1=4? If not, what would the correct answer be?
February 13, 2011

math
My problem I have involves a method that requires using the quadratic equations that comes from India. Here the problem that I have to solve : x to the second power plus 12x minus 64 equals 0 I need someone to walk me through each step to arrived to the answer for this problem...
February 13, 2011

Math
February 13, 2011

Diffeq
d/dx (x)(e^xy)(cos2x). Product rule lets me take the derivative of f(x)g(x). But three functions?
February 11, 2011

Math
Please Help! (R=restaurant) If R1 is 480-8t-0.8t^2 and R2 is 254+0.78t, how would I write a function (R3)that represents the total sales for the the two restaurants?
February 9, 2011

PreCalculus
(R=restaurant) If R1 is 480-8t-0.8t^2 and R2 is 254+0.78t, how would I write a function (R3)that represents the total sales for the the two restaurants?
February 9, 2011

maths
if two sides must be parallel then the fourth side is also 3.5 cm add the sides = perimeter
February 6, 2011

English
I would shy away from first person unless specifically to write from that perspective.
February 6, 2011

maths
1km = 1000 m 100cm = 1 m convert to meters and divide
February 6, 2011

math
check out law of cosines
February 6, 2011

chemistry
Fish-liver oil is a good source of Vitamin A. When 0.1232 g of fish liver oil is dissolved in 500. mL of solvent, an absorbance of 0.724 is recorded. When 0.00167 g of Vitamin A is dissolved in 250. mL of solvent, an absorbance of 1.018 is recorded. Calculate the mass percent ...
February 6, 2011

Math
The additive inverse is the # which when added to a number equals zero. If you consider 12 on the clock to be '0", the -3 and 9 would both have 3 as an "AI"
February 6, 2011

Physics
Thanks, I couldn't find an equation that derives the max velocity of the pendulum in my textbook.
February 5, 2011

Physics
Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5 degrees and its period is 2 s.
February 5, 2011

Physics
Thanks. I was confused by the way the question was worded and my answer was 2 times bigger than what the answer is supposed to be.
February 5, 2011

Physics
A child of mass 40.0 kg is swinging on a swing with ropes of length 4.0 m. How long does it take the child to swing from the maximum height on one side to the other?
February 5, 2011

Science
equal, opposite
February 5, 2011

Social Studies (geography)
do a search for maps of the world / lat /long
February 5, 2011

Math
replace n with inf. 1 + (-1^0/0) = 1 +(-1^0) = 1+1= 2
February 5, 2011

1. Pages:
2. <<Prev
3. 1
4. 2
5. 3
6. 4
7. 5
8. 6
9. 7
10. 8
11. 9
12. Next>>