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Posts by tim

Total # Posts: 1,495

psychology
What are some movies that is related to the issues of child development and developmental psychology

Physics
The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration −5.15 m/s2 for 4.20 s, making skid marks 62.1 m long that end at the tree. With what speed does the truck then strike the tree?

Mathamatics 101
An angle is 35 degrees more than 4 times its supplementary angle. Find the measures of the two angles.

chemistry
how much water should i add to neutralize 1000 milliliters oh ph 13

calculus
Find area of the region under the curve y = 5 x^3 - 9 and above the x-axis, for 3¡Ü x ¡Ü 6. area = ??

math 242
It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 7% per year. If the current demand is increasing by 7000 units per year and if the price remains fixed at $100 per unit, how much revenue will the ...

Biology
Cells absorbing sugar or other small molecules from their surroundings is an example of A. diffusion B.osmosis C. exocytosis D.endocytosis I think it is either C or D because they both have to do with the transportation of molecules in and out of cells.

math
V = pir^2h V = pizza :)

math
The radius r of a sphere is increasing at the uniform rate of 0.3 inches per second. At the instant when the surface area S becomes 100pi square inches, what is the rate of increase, in cubic inches per second, in the volume V?

BUSS/STATS
Steve cutter sells big blade lawn mowers in his hardware store, and he is interested in comparing the reliability of the mowers he sells with the reliability of Big blade mowers sold nationwide. Steve knows that only 15 percent of all Big Blade mowers sold nationwide require ...

bio
How is it possible for an overnourished individual to be malnourished?

Calculus
Thanks again for responding. When we earlier did h=0, the formula was dh/dt=5/2pi=.8 in/min. Intuitively, it makes sense that the rate would reduce as the cup is filling up since the radius is increasing. So, should the answer above have 10 in the numerator instead of 40. Then...

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast is the water level rising now?

Calculus
In the 2nd question (rate of water rising now), how do you calculate r?

Calculus
OK, I understand now. Thanks for all of your help.

Calculus
Thanks. I think that I understand the 1st question now. How about the other questions?

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast was the water level rising 4 minutes ago? How fast is the water level rising now? What will the rate be when ...

physics
So I figured this out myself a=v^2/r which is also equal to (4pi^2*r^2)/T^2 and T is 86400 secs which is how long it takes for a day to pass

physics
How would I know W if that wasn't given?

physics
radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks

physics
should be 2.24m/s use the equation F=m(v^2/r)

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary

algebra
write an equation of the direct variation that includes the given point, (-5/6, 6/5)

article
articles either about animals or specific ecosystems

article
where can i find articles on the ecosystem ?

6th grade Science
Please help me with the questions? 1) How do you respond to some stimuli in your environment? The examples I wrote are: If I am hungry, I will eat food. If I am cold, then I will put on a jacket? 2) What does the fur of a bear have to do with homeostatis? I wrote that the fur ...

Calculus
its from 1 to 3 on the x axis including when it crosses underneath, you subtract that (its like negative area)

Calculus
Finding area under a curve From [1,3] 2x^2 -4x +1

Physics
Divers dive straight out from a cliff that is 21 m high. If the rocks below the cliff extend outward for 15 m, what is the minimum horizontal velocity a diver must have to clear the rocks safely

ochem
how to determine equivalent hyfrogens in hnmr?

chem
why do we use a weak acid or water and not a concentrated acid with NaBh4,etoh reagent?

Math
The equation y=2x+7 represents a linear relationship that is non-proportional. What changes could I make to the equation to make it proportional? Thanks

Economics
Variable cost divided by the change in quantity produced is A. average variable cost. B. marginal cost. C. average total cost. D. None of the above is correct.

pol sci
what impact is the California dream act( ab 131) going to have on us citizens or legal immigrants?

soc..
write a essay describing de jure segregation include why was it established , what happen with de jure segregation from reconstruction to the civil rights movement , and how was jim crow enforced throughout this period

busi/stats
list 3 ways we can reduce the size of a sample, none of which has any direct relationship to the size of the population

busi/stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...

Spanish 8th grade
I have to put these in the past tense-Are they correct? 1. Tú hablas por teléfono. Tú habaste por teléfono. 2. Nosostros bailamos mucho los fines de semana. This would be the same in past tense, I think?? 3. Tú y yo cantamos los domingos. ...

Spanish
Thank you

Spanish
Could you please check these-I had to answer the questions. 1.¿Bailaste ayer? Sí,yo bailé ayer. 2.¿Caminaste a la escuela hoy? Sí, yo caminé a la escuela hoy. 3.¿Visitaste a tus primos el domingo pasado? Sí, yo visit&...

physics
can some one explain how to do this The muzzle velocity of 60g bullet leaving 4kg rifle is 500 m/s towards the east. What is recoil velocity of the rifle?

geometry
if area of triangle wxz is 48 cm squared, x =10 cm, xz = 10 cm, middle =8 cm then what is the perimeter of wxz

stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...

stATS
the standard deviation of the sampling distribution of the means is ____the standard deviation of the population under study.

Chemistry 121
Is 450g of oxygen enough to burn 125g of butane according to the following equation? C4H10 + O2 ---> CO2 + H2O? show why or why not?

Chemistry 121
How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?

Chemistry 121
How much oxygen would be needed to completely burn 250g of propane?

Calculus
A ship sailing parallel to shore sights a lighthouse at an angle of 12 degrees from its direction of travel. After traveling 5 miles farther, the angle is 22 degrees. At that time, how far is the ship from the lighthouse?

chem
Explain clearly why changes in base concentration do not affect the observed reaction rate of an E1 elimination.

chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.08 M C2H3O2-. What is the pH of the resulting solution?

chemistry-acid/base extraction.
I do not understand acid base extraction. why should we mix, for example, an organic and aqueous compound to then separate them from each other. please explain confused....

Algebra
Find the percent of error of each measurement. 0.2cm 0.4cm

Algebra
This is soooo confusing! An airplane flies from New Orleans, Louisiana, to Atlanta, Georgia, at an average rate of 320 miles per hour. The airplane then returns at an average rate of 280 miles per hour. The total travel time is 3 hours. A. Define a variable for the flying time...

Algebra
Yeah, I did it right! Thank you!!

Geography
Following the breakup of the Soviet Union, what are some of the major problems faced by many of the new countries? Thanks.

buss/stats
what is it called when all the items in the population have the same chance of being selected for the sample?

science
Slight issue in the question. It should say the dog has a momentum of.. not moment. Momentum is mass x velocity, so if we know the velocity (it's in the question) we can divide the momentum by the velocity to get the mass. 60 (kg m/s) / 3 (m/s) = 20 kg. Could well be a ...

question
thank you very much

question
But critical writing like argumentative essays have structure. (can you tell me what is wrong with this message?)

physics
What quantity is given by the gradient of such a graph?

Math
Edit...25 balls in the bowl..

Math
There are 20 balls in a bowl. 7 black, 6 blue, 5 green, 4 red, and 3 yellow. Balls must be drawn until 4 different colors are drawn. What is the probability that one is black? Please walk me through if you can...

math
31

Physics 9th grade
no

math
On a board game if you landed on red you move ahead 1 space,land on blue you move ahead 2 spaces,and land on orange you move back 1 space. If you took 30 spins where would you expect to land relative to where you started?

American Government
In The Declaration of Independence how did they signify the colonists’ relationship to Britain?

English
what is John updike`s message in this paragraph? The next morning, I went back to the open vantage from which we had watched the tower so dreadfully slip from sight. The fresh sun shone on the eastward façades, a few boats tentatively moved in the river, the ruins were ...

physics
a stone tied at one end of a string of length,l is whirled in a horizontal circle with constant linear speed,v.which of the following expressions describe the relation between the radius of the circle,r and the angle between the string and the vertical axis?

social studies
Although the Chesapeake and New England colonies differed in many ways, relations with Native Americans followed a similar course in both regions. Why? What were the biggest factors in relations between the two sides? Did relations change over time and why?

social studies
in what ways?

social studies
In what ways did English settlement patterns differ according to region and environmental factors?

Psychology
Can anyone explain to me what they are trying to ask in this question. What is the difference between the Sympathetic Nervous System response and the HPA Axis in terms of both process and function?

buss/stats
Sorry the full question is A loaf of bread is normally distributed with a mean of22 oz. and a standard deviation of 0.5 oz. a, what is the probability that a loaf is btwn 22.75and 23.00? B, 5% of the loafs will weigh less than_____ ounces? C, assuming 200 loaves are baked on a...

bussi./stats
what is the probability that a loaf of bread is between 22.75 and 23.00?

Math
Write the rectangular equation in polar form. (x – 4)2 + y2 = 16

PreCal
Thanks, I am understanding now.

bus/stats
a sample of the personal files of eight male employees revealed that, during a six-month period, they lost the following number of days due to illness: 2,0,6,3,10,4,1 and 2. Calculate the standard deviation of the above sample? the means deviation is 2.375? but not sure how to...

MATHS
Four points lie in a plane. They are partitioned into two pairs so that the sum of the lengths of the segments joining the points of each pair has the minimal possible value. Prove that these segments have no common points.

bus. /stats
Use the data given in the table to construct a frequency distribution and ogive? Before constructing a dam on a Hill river, the Army corps of engineers performed a series of tests to measure the water flow past the proposed location of the dam. The results of the testing were ...

buss./stats
a sample of the personal files of eight male employees revealed that during a six month period they lost the following number of days due to illness 2, 0, 6, 3, 10, 4, 1, 2 calculate the standard deviation show your work

business and stats
What type of data is the projected return on an investment? Qualitative , continous, attribute,discrete or none of the above

Communication
For the following, state the value of the discriminant and then describe the nature of the sloution. -3x^2-8x-19=0

English
I need to check my work on diagramming this question. How many players are on a team? I think it should be as follows: How (adverb) many (adjective) players (direct object) are (past tense verb) on (proposition) a (definite article) team (subject of proposition)? Does this ...

College algebra
Solve. V^2-6v-16=0

Algebra
How do i simplify 3n^2+3n/6n^2+9 by removing factors of 1

Math
what is 3x3x4 is

algebra
10 cm^3 of a normal specimen of human blood contains 1.2 g of hemoglobin. How many grams does 17 cm^3 of the same blood contain?

Math
A firecracker is launched straight up, and its height is a function of time, h(t)= -14^2 + 112t, where h is the height in feet and t is the time in seconds with t=0 corresponding to the instant it launches. What is the height 5 seconds after launch? What is the domain of this ...

chem
What pressure (atm) is exerted by a column of ethanol 86.0 cm high. The density of ethanol is 0.789 g/cm3 and 9.8 m/s2 as your gravitational constant.

PHY
A traveling wave is produced on a rope. The wave travels until it hits a wall and it is reflected. If the speed of the wave is 1.8 m/s and it takes 3.3 s to get back to the starting point, how long (m) is the rope.

chem
The average distance between planet X and Earth is about 1.5 x 10^8 miles. How long (minutes would it take pictures transmitted from a space vehicle on Planet X's surface to reach Earth?

chem
At 36.4°C a sample of ammonia gas exerts a pressure of 6.8 atm. What is the pressure when the volume of the gas is reduced to one-fourth of the original value at the same temperature

mirco-economics
yes

mirco-economics
Help In the first case (Total Fixed Cost equal one million: Total variable cost equal $ 4.4M ($ 4M for wages (fifty thousand workers time eighty dollars per worker) plus four hundred thousand other variable inputs. Average variable cost equal twenty two dollars (Total variable...

math
is the pair of lines parallel x+2y=7 and 2x+4y=3

physics
A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is ...

physics
3. A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is...

Math
How do i graph the function y^2=x*(x-4)^2. I have no idea where to begin.

human resource management
1. Critically evaluate the job analysis that Mary conducted for the position of assistant manager. Has she used appropriate methods? What are the strengths and weaknesses of her efforts? 2. What kind of factors about Today's Fashion and its operations should Mary have ...

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