Posts by dave

Total # Posts: 916

Math
A 1.00kg piece of aluminum at 90.0c in placed in 4.00 liters (4.00kg) of water at 25.0c. What is the final temperature(Tf)

Physics
A 3000kg satellite orbits the Earth 400km above the equator. find a)The speed of the satellite b) The kinetic energy of the satellite c) The potential energy of the satellite d) The total energy of the satellite

Physics
You know weight can be derived from the force of Newtons. 56N/9.8=5.174. That is the weight in kg.

calculus
f(x) = 2 x^3 - 24 x^2 + 90 x + 14 is increasing.

Chemistry
How long would it take a 20Kw heater to warm up 1000 litres of water from 15 degrees to 55 degrees in hours? specific heat of water = 4.18kJ. also How much heat would a block of ice melting at 200Kg per hour absorb? thanks if anyone can help!

Chem
Suppose that a stable element with atomic number 119, symbol Wr, has been discovered. (d) What would be the most likely charge of the Wr ion in stable ionic compounds? (e) Write a balanced equation that would represent the reaction of Wr with water. (f) Assume that Wr reacts ...

algebra
solve quadratic equation x2 + x + (sqrt 3/4)i = 0 complex roots

pysics
if 15 grams of iron combines with 6.5 grams of oxygen, how much rust is formed

Chem
im confused on how to get the grams to KJ.

Chem
Calculate the heat capacity of a calorimeter if th ecombustion of 4.665 g of benzoic acid led to an increase in temperature of 7.148 C

Political Sci
What changed, if anything, in the American political culture between 2004 and 2008? Further, please feel free to examine changes to 2012, and how they might influence this year's November presidential and congressional elections.

chemistry
Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M X bond. Answer in units of kJ/mol

physics
Ann is driving down a street at 58 km/h. Suddenly a child runs into the street. If it takes Ann 0.778 s to react and apply the brakes, how far will she have moved before she begins to slow down?

Science
If a beam of blue light was shone through a glass prism, you would expect to see A. The beam pass straight through, unaltered B. The beam bent and split into a spectrum of colors C. The beam bent, but continue as a blue beam Or D. The beam absorbed and turned into heat

physical science
A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...

chem
No. H2SO3 is not present in aqueous solution. The reaction is nonsense.

math
If landlord is charging .50 per ft for 26,100 sq ft warehouse, what is the lease amount

Physics
vertically up at 28m/sec, gravity 9.8 meters/sec^2 = what is max. height

Algebra
divide and simplify (y^3-3y)/(y^2-9)divided by (y^2-7y-30)/(y^2+6y+9) Please help!

Operations Management
Twelve samples, each containing five parts, were taken from a process that produces steel rods. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were: A) Determine the upper and lower ...

Law
What is Jones Act (maritime area)?

Cosumer math
Monthly rent: $309 Security deposit: $100 Utility deposit: $60 Phone installation: $38 Initial charges:

physics
A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.

physics
At an altitude of 18.40 Km the temperature is 147.54K and at 78.11 Km it is 567.00K, What is the temperature at 61.5 Km?

Physics
Suppose the space shuttle is in orbit 430 km from the Earth's surface, and circles the Earth about once every 93.2 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...

statistics
A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).

Physics
An FM radio station broadcasts electromagnetic waves at a frequency of 1.08 × 10§ hertz. The speed of these waves is 3.0 × 10§ meters/second. Find the wavelength.

Physics
The value of acceleration due to gravity (g) on a point 10,000 kilometers above sea level is about 1.49 meters/second2. How much will an object, which weighs 98 newtons on the surface of Earth, weigh on this point? The value of acceleration due to gravity on Earth is 9.8 ...

statistics
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the interval that contains 87% of the...

statistics
a the gym i notice women tend to work out together more then men. males together at gym 5 alone 7 women alone 6 together 6 what statistical test should i use what is the Ha and Ho what is the appropriate analysis and should the Ho be rejected

Six Sigma
Period Cycle Time 1 45 2 33 3 44 4 30 5 51 6 47 7 39 8 34 9 69 10 43 11 29 12 38 13 45 14 49 15 73 16 38 17 50 18 40 19 57 20 36 21 31 22 46 23 40 24 51 25 48 26 37 27 42 28 50 Calculated R-Bar: Upper control limit for the range: Upper control limit for the individuals: Lower ...

Math
385

series and parellel circuits
Hi Bob, just to make sure... I figure out the top and bottom .. and not the left and right .. is that correct?

series and parellel circuits
ok here we go ... its a series-parellel circuit with 5 resistors. 12 volt battery- wire goes up then one wire branches up at 45 deg with a 10 ohm resistor then down at a 45 deg with a 10 ohm resistor, a second wire branches down at 45 deg with a 20 ohm resistor then up at a 45...

statistics
the probability that a voting-age adult in 2008 voted in the presidential election was .57. Five voting age adults in 2008 were randomly selected. Find the probability that exactly 2 of the 5 adults voted in the presidential election.

history
Describe the purpose of the Native American reservation as well as the lives led by those who resided there. Did the reservation encourage or discourage Native American culture? If so, in what ways?

history
Discuss the original purposes of the Freedman’s Bureau and the goals of the planned enlargement of the program by Congress. Evaluate how successful it was in helping the Reconstruction efforts

bio
Would you agree that it is valuable for a nation to have a citizenry that is reasonably well versed in science? Give reasons for your answer. Would you say this need has become especially urgent in the last two decades? Why or why not? Evaluate

bio
Orange juice is often touted by nutritionists as being an excellent antioxidant. Within an essay response, discuss the following concepts: an antioxidant’s function, free radicals and their effect on the human body, sources of vitamin C, optimal delivery system for ...

Life orientation
NGO

trig
At rest, the human heart beats once every second. At the strongest part of the beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0 corresponds to the peak of the beat, ...

calculus
The volume of grains in a silo at a particular time (measured in hours) is given by V (t) = 4t(3-t)m^3 Find the rate of change of the volume of grains in the silo from first principles (using the definition of the rate of change)

math
Consider the function f(x) = 2x 2 + 1. Find the equation of the tangent to the graph of f(x) at x = 2 (when calculating f'(2, use first principles)

trig
Consider the trigonometric function f(t) = -3+4cos(pi/3(t-3/2)) What is the amplitude/period of f(t)? What are the maximum and minimum values attained by f(t)?

Physics
1000W

Physics
container holding 340g of water (initially at 14 degrees celsius) is placed in microwave oven, which is turned on for 3 minutes. Assuming all microwave energy is absorbed by water, how much water is left in container?

us history
Which of the following statements is FALSE about Andrew Johnson's perspective about the South? Answer He viewed Southern plantation aristocrats with contempt. He wanted to treat the South similar to a conquered province. He blamed individuals for leading the South to war...

bio
Would you agree that it is valuable for a nation to have a citizenry that is reasonably well versed in science? Give reasons for your answer. Would you say this need has become especially urgent in the last two decades? Why or why not? Evaluate Answer

biology
Orange juice is often touted by nutritionists as being an excellent antioxidant. Within an essay response, discuss the following concepts: an antioxidant’s function, free radicals and their effect on the human body, sources of vitamin C, optimal delivery system for ...

Reading/English
THANKS FOR THOSE EIGHT CORRECTIONS !!!

Finance
I'm thinking it's a function of saving the money in an account that earns the 12% (compounded monthly) over the 4 year period. $500 saved @ an annual rate of return of 12% (again, compounded monthly) yields $806.11 - or $306.11 of interest, which comes to $76.73 of ...

ecology
We can find that there are three topics that may generate high costs, which can make inefficient use of large-scale wind energy: - The purchase and set-up of wind turbines can be expensive - Wind turbines require certain constant speeds to be productive - Wind farms can't ...

health
A. diphtheria. B. deadly epidemics. C. heart disease. D. influenza.

Physics
A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.6 m/s2. She decides to test the car by dragging with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 0.8 s before Kathy. If Stan moves with...

Business
That's very broad. The sorts of things you should be looking at is government spending (welfare (if there is any), impacts on healthcare), un-employment figures, inflation etc. Is there any particular question you're asking?

UCI
They said not to contact them till the end of March...

UCI
No

UCI
Did UC Irvine stop sending acceptances for 2012? If not, when is the last day? Also when do they send rejection letters? Thanks ^.^

Math
Sally runs 2.8 m/s. John runs 1.9 m/s. if John has a 30 m head start. How far before Sally catches John?

Bussiness
djkaf

math
if a man walked 1/12th of a mile one day 2/12ths of a mile the next day and 3/12ths of a mile the next day on what day did he walk a complete mile

physics
An object is dropped from a height of 12m.At what height is the rock kinetic energy and its potential energy be equal?

physics
A proton has an initial speed of 3.9×105 m/s. What potential difference is required to bring the proton to rest? What potential difference is required to reduce the initial speed of the proton by a factor of 2? What potential difference is required to reduce the initial ...

PHYSICS
A parallel-plate capacitor has plates with an area of 450 cm^2 and an air-filled gap between the plates that is 2.30 mm thick. The capacitor is charged by a battery to 570 V and then is disconnected from the battery. How much energy is stored in the capacitor? (muJ) The ...

PHYSICS
Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same ...

Maths- Percentage
Part / whole =percent. 24/120=.20=20% 36/120=.30=30% 54/120=.45=45% 6/120=.05=5%

precal
I got it. 3.75^(1/64)=1.020867172-1=.02086712*4= 0.08346868=8% this is on the TI84 Calculator

precal
4(3.75^1/64-1)=r

physics
ok does anyone know how to do this i need step by step help on this

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?

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...

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

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...

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?

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?

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 ...

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.

physics
8 1/4 "tall 20 1/4" wide @ bottom what is angle?

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.

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

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.

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.

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.

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 ...

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 ...

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 ...

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 ...

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 ...

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

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 ...

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–?

university composition and communcation 1
yes

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?

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

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. ...

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.

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.

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

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

Physics
25 Newtons

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